HomeMy WebLinkAboutFile Documents.1012 E Cooper Ave.0131-2020-BRES (19)Place
Model/Serial #
Label Here
Located in Manual Bag
U334-0771X02(00)
INTERNAL (INDOOR) MODELS:
RU199i (REU-N3237FF-US)
RU180i (REU-N2934FF-US)
RU160i (REU-N2530FF-US)
RU130i (REU-N2024FF-US)
EXTERNAL (OUTDOOR) MODELS:
RU199e (REU-N3237W-US)
RU180e (REU-N2934W-US)
RU160e (REU-N2530W-US)
RU130e (REU-N2024W-US)
Tankless Water Heater (Residential)
Installation and Operation Manual
ANSI Z21.10.3 ● CSA 4.3
06000012336368
Rinnai Tankless Water Heater Installation and Operation Manual 2
WARNING
If the information in these instructions is not followed exactly, a fire or explosion may result
causing property damage, personal injury, or death.
• Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any
other appliance.
• WHAT TO DO IF YOU SMELL GAS
–Do not try to light any appliance.
–Do not touch any electrical switch; do not use any phone in your building.
–Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instruc-
tions.
–If you cannot reach your gas supplier, call the fire department.
• Installation and service must be performed by a trained and qualified professional, service agency
or the gas supplier.
Assurez-vous de bien suivre les instructions données dans cette notice pour réduire au
minimum le risque d’incendie ou d’explosion ou pour éviter tout dommage matériel, toute
blessure ou la mort.
• Ne pas entreposer ni utiliser d’essence ou ni d’autres vapeurs ou liquides inflammables à proxim-
ité de cet appareil ou de tout autre appareil.
• QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ :
–Ne pas tenter d’allumer d’appareil.
–Ne touchez à aucun interrupteur ; ne pas vous servir des téléphones se trouvant dans le bâti-
ment.
–Appelez immédiatement votre fournisseur de gaz depuis un voisin. Suivez les instructions du
fournisseur.
–Si vous ne pouvez rejoindre le fournisseur, appelez le service des incendies.
• L’installation et l’entretien doivent être assurés par un installateur ou un service d’entretien quali-
fié ou par le fournisseur de gaz.
AVERTISSEMENT
Full-length French and Spanish versions available online at rinnai.us
Rinnai Tankless Water Heater Installation and Operation Manual 3
Contents
1. Welcome ..........................................................................................................................................5
2. Safety ...............................................................................................................................................6
2.1 Safety Symbols .......................................................................................................................7
2.2 Safety Precautions ..................................................................................................................7
3. About the Water Heater ..................................................................................................................9
3.1 Front View ...............................................................................................................................9
3.2 Bottom View ..........................................................................................................................10
3.3 Components .........................................................................................................................11
3.4 Specifications ........................................................................................................................12
3.5 Dimensions ...........................................................................................................................13
3.6 Accessories ..........................................................................................................................15
4. Install the Water Heater ................................................................................................................17
4.1 Installation Guidelines ..........................................................................................................17
4.2 What You Will Need ..............................................................................................................18
4.3 Choose an Installation Location ............................................................................................19
4.4 Mount the Water Heater to the Wall ......................................................................................24
4.5 Vent the Water Heater ..........................................................................................................26
4.6 Connect Water Supply ..........................................................................................................50
4.7 Install the Isolation Valves ....................................................................................................51
4.8 Install Pressure Relief Valve .................................................................................................52
4.9 Connect Condensate Drain ..................................................................................................54
4.10 Connect the Gas Supply .......................................................................................................57
4.11 Connect the Power Supply ...................................................................................................60
4.12 Configure Parameter Settings .............................................................................................61
4.13 External Pump with Circ-Logic .............................................................................................63
4.14 Post-Water Heater Installation Checklist .............................................................................64
5. Operation .......................................................................................................................................66
5.1 Safety Precautions ................................................................................................................66
5.2 Operating Instructions ...........................................................................................................68
5.3 Control Panel ........................................................................................................................69
Rinnai Tankless Water Heater Installation and Operation Manual 4
5.4 Setting the Temperature .......................................................................................................70
5.5 Performance Data .................................................................................................................71
5.6 Diagnostic Codes ..................................................................................................................73
6. Maintenance ..................................................................................................................................76
6.1 Maintenance .........................................................................................................................76
6.2 Cleaning and Inspecting the Air Filter (Indoor Units Only) ....................................................78
6.3 Flushing the Heat Exchanger ...............................................................................................80
6.4 Draining the Water Heater ....................................................................................................81
7. Appendices ...................................................................................................................................82
7.1 Massachusetts State Gas Regulations .................................................................................82
7.2 Wiring Diagram .....................................................................................................................84
7.3 Ladder Diagram ....................................................................................................................85
7.4 Pressure Drop and Water Flow Curves ................................................................................86
7.5 Guidelines for Additional Temperature Controllers ...............................................................87
8. Warranty ........................................................................................................................................88
Rinnai Tankless Water Heater Installation and Operation Manual 5
ANSI American National Standards
Institute
BTU British Thermal Unit
DHW Domestic Hot Water
GPM Gallons per minute
LP Liquid Propane
NG Natural Gas
PP Polypropylene
PRV Pressure Relief Valve
PSI Pounds per square inch
W.C.Inches water column
To The Consumer
• You must read the entire manual to prop-
erly operate the water heater and to have
regular maintenance performed.
• Keep this manual for future reference.
• As when using any appliance generating
heat, there are certain safety precautions
you should follow. See section “2.1 Safety
Precautions” for detailed safety precau-
tions.
• Be sure your water heater is installed by a
trained and qualified professional.
• If installing in the state of Massachusetts,
you must read section “7.1 Massachusetts
State Gas Regulations” in this manual.
Acronyms and Abbreviations
Table 1 provides a list of common acronyms and
abbreviations used in this manual:
Thank you for purchasing a Rinnai Tankless
Water Heater. Before installing and operating this
water heater, be sure to read these instructions
completely and carefully to familiarize yourself with
the water heater’s features and functionality.
To The Installer
• It is recommended that a trained and
qualified professional who has attended a
Rinnai training class complete the instal-
lation. The warranty may be voided due to
any improper installation.
• A trained and qualified professional should
have skills such as:
–Gas sizing
–Connecting gas lines, water lines,
valves, and electricity
–Knowledge of applicable national, state,
and local codes
–Installing venting through a wall or roof
–Training in installation of tankless water
heaters. Training on Rinnai Tankless
Water Heaters is accessible at
www.trainingevents.rinnai.us
• Read all instructions in this manual before
installing the water heater. The water heat-
er must be installed according to the exact
instructions in this manual.
• Proper installation is the responsibility of
the trained and qualified professional.
• When installation is complete, leave this
manual with the water heater (for internal/
indoor units) or give the manual directly to
the consumer.
1. 1. WelcomeWelcome
Table 1
WARNING AVERTISSEMENT
Rinnai Tankless Water Heater Installation and Operation Manual 6
• Assurez-vous de bien suivre les instruc-
tions données dans cette notice pour
réduire au minimum le risque d’incendie
ou d’explosion ou pour éviter tout dom-
mage matériel, toute
• Assurez-vous de bien suivre les instruc-
tions données dans cette notice pour
réduire au minimum le risque d’incendie
ou d’explosion ou pour éviter tout dom-
mage matériel, toute blessure ou la mort.
• Ne pas entreposer ni utiliser d’essence ou
ni d’autres vapeurs ou liquides inflamma-
bles à proximité de cet appareil ou de tout
autre appareil.
• QUE FAIRE SI VOUS SENTEZ UNE
ODEUR DE GAZ :
–Ne pas tenter d’allumer d’appareil.
–Ne touchez à aucun interrupteur ; ne
pas vous servir des téléphones se
trouvant dans le bâtiment.
–Appelez immédiatement votre fournis-
seur de gaz depuis un voisin. Suivez
les instructions du fournisseur.
–Si vous ne pouvez rejoindre le fournis-
seur, appelez le service des incendies.
• L’installation et l’entretien doivent être
assurés par un installateur ou un service
d’entretien qualifié ou par le fournisseur
de gaz.
• Les panneaux d’avertissement de ce man-
uel sont ici pour éviter de vous blesser et
d’autres personnes. Suivez- les explicite-
ment.
• If the information in these instructions is
not followed exactly, a fire or explosion
may result causing property damage,
personal injury, or death.
• Do not store or use gasoline or other flam-
mable vapors and liquids in the vicinity of
this or any other appliance.
• WHAT TO DO IF YOU SMELL GAS:
–Do not try to light any appliance.
–Do not touch any electrical switch; do
not use any phone in your building.
–Immediately call your gas supplier from
a neighbor’s phone. Follow the gas
supplier’s instructions.
–If you cannot reach your gas supplier,
call the fire department.
• Installation and service must be performed
by a trained and qualified professional,
service agency or the gas supplier.
• The warning signs in this manual are here
to prevent injury to you and others. Please
follow them explicitly.
2. 2. SafetySafety
WARNING
WARNING
CAUTION
Rinnai Tankless Water Heater Installation and Operation Manual 7
2.2 Safety Precautions
The following precautions apply to the trained and
qualified professional and consumer. Read and
follow all instructions in this section.
DO NOT adjust the
internal gas valve.
The design is such that adjustment is not re-
quired. Warranty may be voided if the internal gas
valve is adjusted.
• Before operating, smell all around the ap-
pliance area for gas. Be sure to smell next
to the floor because some gas is heavier
than air and will settle on the floor.
• Keep the area around the appliance clear
and free from combustible materials,
gasoline, and other flammable vapors and
liquids.
• Combustible construction refers to adja-
cent walls and ceiling and should not be
confused with combustible or flammable
products and materials. Combustible and/
or flammable products and materials
should never be stored in the vicinity of
this or any gas appliance.
• Always check the water temperature be-
fore entering a shower or bath.
• To protect yourself from harm, before per-
forming maintenance:
–Turn off the electrical power supply by
unplugging the power cord or by turning
off the electricity at the circuit breaker.
(The temperature controller does not
control the electrical power.)
–Turn off the gas at the manual gas con-
trol valve, usually located immediately
below the water heater.
–Turn off the incoming water supply.
This can be done at the isolation valve
immediately below the water heater or
by turning off the water supply to the
building.
Safety alert symbol. Alerts you to
potential hazards that can kill or hurt you
and others.
Indicates an imminently
hazardous situation which,
if not avoided, will result in
personal injury or death.
DANGER
Indicates a potentially
hazardous situation which,
if not avoided, could result
in minor or moderate injury.
It may also be used to alert
against unsafe practices.
Indicates an imminently
hazardous situation which,
if not avoided, will result in
personal injury or death.
2.1 Safety Symbols
Rinnai Tankless Water Heater Installation and Operation Manual 8
• DO NOT operate the water heater without
the front panel installed. The front panel
should only be removed for service/main-
tenance or replacing internal components.
• BURN HAZARD. Hot exhaust and vent
may cause serious burns. Keep away from
the water heater. Keep small children and
animals away from the water heater.
• Hot water outlet pipes leaving the water
heater can be hot to touch.
• Do not store or use gasoline or other flam-
mable vapors and liquids in the vicinity of
this or any other appliance.
(Ne pas entreposer ni utiliser d’essence ou
ni d’autres vapeurs ou liquides inflamma-
bles à proximité de cet appareil ou de tout
autre appareil.)
• Install the vent system per local and na-
tional codes.
• Do not install this water heater above
10,200 ft
(3,109 m).
• Do not obstruct combustion air to the
water heater.
• Failure to properly vent this appliance
can result in death, personal injury and/or
property damage.
• Rinnai recommends that every home have
a carbon monoxide (CO) alarm in the hall-
way near bedrooms in each sleeping area.
Check batteries monthly and replace them
annually.
–Use only your hand to turn the manual
gas control valve. Never use tools. If
the manual gas control valve will not
turn by hand, do not try to repair it; call
a trained and qualified professional.
Force or attempted repair may result in
a fire or explosion.
• Do not use this appliance if any part
has been under water. Immediately call
a trained and qualified professional to
inspect the appliance and to replace any
part of the control system and any manual
gas control valve which has been under
water.
(N’utilisez pas cet appareil s’il a été plunge
dans l’eau, même partiellement. Faites
inspecter l’appareil par un licence pro-
fessionnelle et remplacez toute partie du
système de contrôle et toute commande
qui ont été plongés dans l’eau.)
• Do not use substitute materials. Use only
parts certified for the appliance.
• Should overheating occur or the gas sup-
ply fail to shut off, turn off the manual gas
control valve to the appliance.
(En cas de surchauffe ou si l’alimentation
en gaz ne s’arrête pas, fermez manuelle-
ment le robinet d’arrêt de l’admission de
gaz.)
• Only trained and qualified professionals
are permitted to adjust parameter settings.
• Do not use an extension cord or adapter
plug with this appliance.
• Any alteration to the appliance or its con-
trols can be dangerous and will void the
warranty.
• Proper venting is required for the safe
operation of this appliance.
• Flammable liquids such as cleaning sol-
vents, aerosols, paint thinners, adhesives,
gasoline and propane must be handled
and stored with extreme care. These
flammable liquids emit flammable vapors
and when exposed to an ignition source
can result in a fire hazard or explosion.
Flammable liquids should not be used or
stored in the vicinity of this or any other
gas appliance.
Rinnai Tankless Water Heater Installation and Operation Manual 9
3. 3. About the Water HeaterAbout the Water Heater
3.1 Front View
Indoor Outdoor
Figure 1: Front view
Topics in this section
• Front View
• Bottom View
• Components
• Specifications
• Dimensions
• Accessories
Controller
Piping Connections
Vent
Connections
Exhaust
Duct
Rinnai Tankless Water Heater Installation and Operation Manual 10
3.2 Bottom View
Gas InletHot Water
Outlet
Cold Water
Inlet
Pressure Relief
Valve
Figure 2: Bottom view
Rinnai Tankless Water Heater Installation and Operation Manual 11
3.3 Components
Air Intake
Burner Assembly
Ignition Unit
PC Board Cover
Control Panel
Water Flow Servo
Valve
Heat Exchanger
Gas Valve
Flue Gas Exhaust
Air Inlet Filter
Fan with Integrated
Venturi
Silencer
Intake
Exhaust
Figure 3: Components
Rinnai Tankless Water Heater Installation and Operation Manual 12
3.4 Specifications
Indoor Units Outdoor Units
RU199i RU180i RU160i RU130i RU199e RU180e RU160e RU130e
Minimum Gas
Consumption Btu/h
15,000
Maximum Gas Consumption Btu/h 199,000 180,000 160,000 130,000 199,000 180,000 160,000 130,000
Flow Rate1
(Min-Max)
0.26-9.8 GPM (1.0-37 L/min)0.26-9.0 GPM (1.0-34 L/min)0.26-8.0 GPM (1.0-30 L/min)0.26-6.6 GPM (1.0-24 L/min)0.26-9.8 GPM (1.0-37 L/min)0.26-9.0 GPM (1.0-34 L/min)0.26-8.0 GPM (1.0-30 L/min)0.26-6.6 GPM (1.0-24 L/min)
Max Flow Rate with Parameter Adjustment
11 GPM (42 L/min)10 GPM (38 L/min)9 GPM (34 L/min)7 GPM (26 L/min)11 GPM (42 L/min)10 GPM (38 L/min)9 GPM (34 L/min)7 GPM (26 L/min)
Weight 64 lb (29 kg)62 lb (28 kg)64 lb (29 kg)62 lb (28 kg)
Sound Level 48 dB 47 dB 53 dB 52 dB
El
e
c
t
r
i
c
a
l
D
a
t
a
Normal 84 W 65 W 52 W 38 W 81 W 62 W 49 W 36 W
Standby 1.3 W
With Freeze Protection 148 W 152 W
Max Current 4 Amps
Fuse 10 Amps
Temperature Setting Minimum 98°F (37°C) Maximum: Default: 120°F (49°C) With Parameter Adjustment: 140°F (60°C)
Bypass Flow Control Electronic
Ga
s
S
u
p
p
l
y
Pr
e
s
s
u
r
e
2 Natural Gas 3.5 in. w.c. - 10.5 in. w.c.
Propane 8.0 in. w.c. - 13.5 in. w.c.
Type of Appliance Super-High-Efficiency (Condensing), Tankless, Temperature Controller, Continuous Flow Gas Hot Water System
Ignition System Direct Electronic Ignition
Electric Connections Appliance: AC 120 Volts, 60Hz
Temperature Controller: DC 12 Volts (Digital)
Water Supply Pressure Optimal water pressure: 50 PSI (Recommended 60-80 PSI for maximum performance) Maximum: 150 PSI
Remote Control Cable Non-Polarized Two Core Cable (Minimum 22 AWG)
ENERGY STAR® Qualified Yes
Complies with South Coast Air Quality Management District 14 ng/J or 20 ppm NOx emission levels
Yes
1 Minimum flow may vary slightly depending on the temperature setting and the inlet water temperature. Minimum activation flow is 0.4 GPM (1.5 L/min).
2 The maximum gas supply pressure must not exceed the value specified by the manufacturer.Rinnai products are continually being updated and improved; therefore, specifications are subject to change without prior notice.
Table 2: Specifications
Rinnai Tankless Water Heater Installation and Operation Manual 13
3.5 Dimensions
Measurements: in. (mm)
Indoor Models
(RU199i, RU180i, RU160i, and RU130i)
Front View Side View
Outdoor Models
(RU199e, RU180e, RU160e, and RU130e)
Front View Side View
Vent Connection:
2 in. (51 mm) nominal
PVC/Polypropylene or
3 in./5 in. Concentric.
Figure 4: Indoor Dimensions
Figure 5: Outdoor Dimensions
Rinnai Tankless Water Heater Installation and Operation Manual 14
5.6. (142)
5.10 (129)
7.75 (197)
5.
2
5
(
1
3
3
)
3.
5
(
8
9
)
2.
8
(
7
1
)
7.
6
(
1
9
3
)
6.
2
(
1
5
7
)
1.22 (31)
.36 (9)
Cold Inlet
Gas
Hot Outlet
Condensate
Drain Pressure
Relief Valve
Connection Connection Size
Gas 3/4 in. NPT
Cold Inlet 3/4 in. NPT
Hot Outlet 3/4 in. NPT
Condensate Drain 1/2 in. NPT
Pressure Relief Valve M33 Thread
3.5.1 Supply Connections
Measurements: in. (mm)
Figure 6: Supply Connections
Table 3: Supply Connections
Rinnai Tankless Water Heater Installation and Operation Manual 15
Product Product Description Image
Room Air Screen
Part #: 108000105
Recommended air filter/screen for use in
room air applications only.
Condensate Neutralizer
Part #: 804000074
Neutralizes the condensate generated by
the water heater.
ScaleCutter
Part #: 103000038
Filters and reduces the amount of scale
entering the water heater allowing for
greater water heater longevity.
ScaleCutter Refill
Cartridge
Part #: 103000039
Refill cartridge for the ScaleCutter filter
assembly.
Drain Down Kit
Part #: 104000059
Provides freeze protection by immediate-
ly draining the water heater upon loss of
power.
Additional Controller
Part #: MC-601-BK
MC-601-W
MC-195T-US
Additional controllers are available for
user convenience.
Recess Box
Part #: RGB-CTWH-4
Allows an external (outdoor) water heater
to be recessed into a wall.
Pipe Cover
Part #: PCD07-SM
Encloses the piping below the water
heater for aesthetic purposes.
Control-R™ Wi-Fi
Module (And
Accessories)
Part #: RWM101
Controls On-Demand recirculation, re-
motely adjust temperatures, and commu-
nicates with the service provider portal.
The Control-R™ Wi-Fi Module and MC-
195T-US controller are not compatible
accessories and must not be installed
together.
3.6 Accessories
Numerous optional accessories are available for purchase for your Rinnai Tankless Water Heater. Listed
below are some commonly purchased accessories. For a complete list of accessories, visit www.rinnai.us.
For questions, or to purchase an accessory, contact your local Rinnai dealer/distributor or Rinnai
Customer Care at 1-800-621-9419.
Table 4: Accessories
Rinnai Tankless Water Heater Installation and Operation Manual 16
Product Product Description Image
Recirculation Pump
Part #: RWMGTK03
A pump system can be incorporated with
Rinnai Circ-Logic recirculation technology
in a dedicated recirculation system.
External Pump Cable
Part #: 105000250
Provides electrical connections for exter-
nal recirculation pump control.
EZConnect™ Cable
Part #: REU-EZC-2
Electronically connects two water heaters
and allows them to function as one hot
water source.
DPS/MIS Switch
Part #: REU-OPU3
The Domestic Priority Switch (DPS) func-
tion provides domestic hot water priority
for combination tankless water heater/ air
handler applications.
The Maintenance Indication Switch (MIS)
function provides tankless water heater
monitoring via systems such as Building
Management System (BMS).
Rinnai Tankless Water Heater Installation and Operation Manual 17
4. 4. Install the Water HeaterInstall the Water Heater
THIS SECTION IS INTENDED FOR THE
INSTALLER
Installer qualifications: A trained and qualified
professional must install the appliance, inspect
it, and leak test the water heater before use. The
warranty may be voided due to any improper
installation. The trained and qualified professional
should have skills such as: Gas sizing; Connecting
gas lines, water lines, valves, and electricity;
Knowledge of applicable national, state, and
local codes; Installing venting through a wall or
roof; and training in installation of tankless water
heaters. Training for Rinnai Tankless Water
Heaters is accessible online at
www.trainingevents.rinnai.us.
4.1 Installation
Guidelines
When installing the water heater, follow these
guidelines:
• This water heater is certified for installation
in residential applications and manufac-
tured (mobile) homes.
• This water heater is suitable for combina-
tion water heating and space heating and
not suitable for space heating applications
only.
• The installation must conform with local
codes or, in the absence of local codes,
with the National Fuel Gas Code, ANSI
Z223.1/NFPA 54, or the Natural Gas and
Propane Installation Code, CSA B149.1.
If installed in a manufactured home, the
installation must conform with the Manu-
factured Home Construction and Safety
Standard, Title 24 CFR, Part 3280 and/
or CAN/SCA Z240 MH Series, Mobile
Homes.
• The appliance, when installed, must be
electrically grounded in accordance with
local codes or, in the absence of local
codes, with the National Electrical Code,
ANSI/NFPA 70, or the Canadian Electrical
Code, CSA C22.1.
• The appliance and its main gas valve
must be disconnected from the gas supply
piping system during any pressure testing
of that system at test pressures in excess
of 1/2 psi (3.5 kPa) (13.84 in W.C.). For
system testing at pressures less than or
equal to 1/2 psi (3.5 kPa) (13.84 in W.C.)
the appliance must be isolated from the
gas supply piping by closing its individual
manual shutoff valve.
• You must follow the installation instructions
and those in section “4.5 Vent the Water
Heater” for adequate combustion air and
exhaust.
• If a water heater is installed in a closed
water supply system, such as one having
a backflow preventer in the cold water sup-
ply line, means shall be provided to control
thermal expansion. Contact the water sup-
plier or local plumbing inspector on how to
control thermal expansion.
• Should overheating occur or the gas sup-
ply fail to shut off, turn off the manual gas
control valve to the appliance.
(En cas de surchauffe ou si l’alimentation
en gaz ne s’arrête pas, fermez manuelle-
ment le robinet d’arrêt de l’admission de
gaz.)
• Combustion air must be free of chemicals,
such as chlorine or bleach, that produce
fumes. These fumes can damage com-
ponents and reduce the life of your appli-
ance.
Topics in this section
• Installation Guidelines
• What you will need
• Choose Installation Location
• Mount Water Heater to the Wall
• Vent Water Heater
• Connect Water Supply
• Install Isolation Valves
• Install Pressure Relief Valve
• Connect Condensate Drain
• Connect Gas Supply
• Connect Power Supply
• Configure Parameter Settings
• Connect External Pump with Circ-Logic
• Post-Installation Checklist
Rinnai Tankless Water Heater Installation and Operation Manual 18
DO NOT
• DO NOT install the following internal
(indoor) water heaters outdoor: RU199i,
RU180i, RU160i, or RU130i.
• DO NOT install the following external
(outdoor) water heaters indoor: RU199e,
RU180e, RU160e, or RU130e.
• DO NOT install the water heater in an area
where water leakage of the unit or con-
nections will result in damage to the area
adjacent to the appliance or to lower floors
of the structure. When such locations can-
not be avoided, it is recommended that a
suitable drain pan, adequately drained, be
installed under the water heater. The pan
must not restrict combustion air flow.
• DO NOT install the water heater in an area
with negative air pressure.
• DO NOT obstruct the flow of combustion
and ventilation air.
• DO NOT use chemically treated water (i.e.
chlorinated water or salt water for pools or
spas) in the appliance.
• DO NOT use substitute parts that are not
authorized for this appliance.
4.2 What You Will
Need
4.2.1 Items Included
Unpack the Rinnai Tankless Water Heater
package and verify the following contents are
included. If any items are missing, contact your
local dealer/distributor or call Rinnai Customer
Care at 1-800-621-9419.
• Rinnai Tankless Water Heater
• Wall Mounting Bracket (for internal/indoor
water heaters only)
• Pressure Relief Valve and Adapter
• Isolation Valve Kit (for quick isolation of
the water heater for service and/or mainte-
nance)
• Literature Bag
–Tankless Water Heater Installation and
Operation Manual (this manual)
–Wall Mounting Bracket Template (for
internal/indoor water heaters only)
–Model/Serial Number Labels (with
printed QR code)
• Controller Cable (for additional controller
connection)
• Vent screens (x2) and vent screen screws
(x2) (for internal/indoor water heaters
only). The vent screen prevents debris and
other objects from entering the terminal.
One vent screen is for the intake; the other
is for the exhaust.
• Self-Tapping Screws (x2) (for internal/
indoor water heaters only)
4.2.2 Items Needed (Field-
Supplied)
• Pipe wrenches (x2)
• Phillips Head screwdriver
• Wire Cutters
• Gloves
• Safety glasses
• Level
• Soap or gas leak detector solution
• Approved venting
• Teflon tape (recommended) or pipe
compound
• Pipe insulation
• Hammer drill with concrete bits
• Saw
• Threading machine with heads and oiler
• Core drill with diamond head
• Torch set
• Copper tubing cutter
• Steel pipe cutter
• Heat tape
• Electrical wire
• Concrete wall anchors
• Optional pipe cover
• PVC glue/cement and primer
• 2 conductor 22 AWG wire for controller
Rinnai Tankless Water Heater Installation and Operation Manual 19
4.3 Choose an
Installation
Location
When selecting an installation location, you
must ensure that all water heater and venting
clearances will be met and that the vent length will
be within required limits. Consider the installation
environment, water quality, and the need for
freeze protection. Requirements for the gas line,
water lines, electrical connection, and condensate
disposal can be found in their respective
installation sections in this manual.
4.3.1 Water Quality
Guidelines
This section provides information on the
importance of water quality to the Rinnai Tankless
Water Heater. The information is intended to serve
as a general guide only and is not a complete list
of water quality guidelines.
Consideration of care for your water heater should
include evaluation of water quality. The water must
be potable, free of corrosive chemicals, sand,
dirt, or other contaminants. It is up to the trained
and qualified professional to ensure the water
does not contain corrosive chemicals or elements
that can affect or damage the Rinnai Tankless
Water Heater. Water that contains chemicals
exceeding the levels listed below can damage the
Rinnai Tankless Water Heater. Replacement of
components due to water quality damage is not
covered by the warranty.
If you install this water heater in an area that is
known to have hard water or that causes scale
build-up, the water must be treated and may
require a more frequent flushing schedule. This
water heater includes a service indicator (Service
Soon, SS). When selected in the parameter
settings, an SS code will display on the controller
indicating that it is time to flush and service
the water heater. Scale build-up is caused by
hard water and can be accelerated if the water
heater is set at a high temperature. Rinnai offers
Southeastern Filtration’s “ScaleCutter Water
Conditioning System” that offers superior lime
scale prevention and corrosion control.
4.3.2 Environment
Air surrounding the water heater, venting, and vent
termination(s) is used for combustion and must
be free of any compounds that cause corrosion of
internal components.
These include corrosive compounds that are
found in aerosol sprays, detergents, bleaches,
cleaning solvents, oil-based paints/varnishes, and
refrigerants. The air in beauty shops, dry cleaning
stores, photo processing labs, and storage areas
for pool supplies often contains these compounds.
Therefore, it is recommended that external
(outdoor) models be used for these locations
where possible. In applications utilizing room air
where there are high levels of particulates, Rinnai
offers a room air screen.
The water heater, venting, and vent termination(s)
should not be installed in any areas where the air
may contain these corrosive compounds.
*Source: Part 143 National Secondary Drinking Water
Regulation
Contaminant Maximum Level
Total Hardness Up to 200 mg/L
Aluminum *Up to 0.2 mg/L
Chlorides *Up to 250 mg/L
Copper *Up to 1.0 mg/L
Dissolved Carbon
Dioxide (CO2)Up to 15.0 mg/L
Iron *Up to 0.3 mg/L
Manganese *Up to 0.05 mg/L
pH *6.5 to 8.5
TDS (Total Dissolved
Solids) *Up to 500 mg/L
Zinc *Up to 5 mg/L
Table 5: Water Quality Guidelines
Rinnai Tankless Water Heater Installation and Operation Manual 20
4.3.3 Internal (Indoor) Water
Heaters
• Install the water heater as far away as
possible from any air inlet vents. Corro-
sive fumes, sometimes found in hair/ nail
salons, spas, or other industries exposed
to toxic fumes, may be released through
these vents when not in operation. Chemi-
cals that are corrosive in nature should not
be stored or used near the water heater or
vent termination. This requirement applies
to internal (indoor) and external (outdoor)
water heater.
• In coastal regions, the water heater should
be installed so that it is sheltered/protected
from exposure to sea breeze. Exposure to
salty spray or breeze can cause corrosion
of the water heater.
• DO NOT install the water heater in areas
where combustion air might be contami-
nated with chemicals.
• DO NOT use room air in applications
where the indoor air is corrosive. Install
the water heater as direct vent in a sealed
closet so that it is protected from the po-
tential of contaminated indoor air.
• Install the water heater as far away as
possible from any air inlet vents. Corro-
sive fumes, sometimes found in hair/ nail
salons, spas, or other industries exposed
to toxic fumes, may be released through
these vents when not in operation. Chemi-
cals that are corrosive in nature should not
be stored or used near the water heater or
vent termination. This requirement applies
to internal (indoor) and external (outdoor)
water heaters.
4.3.4 External Water Heaters
and Vent Terminations
• Install the water heater as far away as
possible from exhaust vent hoods and
dryer vents.
• In coastal regions, the water heater should
be installed so that it is sheltered/protected
from exposure to sea breeze. Exposure to
salty spray or breeze can cause corrosion
of the water heater.
• Damage and repair due to corrosive
compounds in the air is not covered by
warranty.
• Install the water heater as far away as
possible from any air inlet vents. Corro-
sive fumes, sometimes found in hair/ nail
salons, spas, or other industries exposed
to toxic fumes, may be released through
these vents when not in operation. Chemi-
cals that are corrosive in nature should not
be stored or used near the water heater or
vent termination. This requirement applies
to internal (indoor) and external (outdoor)
water heaters.
Rinnai Tankless Water Heater Installation and Operation Manual 21
4.3.5 Freeze Protection
Make sure that in case of freezing weather the water heater and its water lines are protected to prevent
freezing. Damage due to freezing is not covered by the warranty.
When connected to a 120-volt power supply, the water heater will not freeze when the outside air
temperature is as cold as -22°F (-30°C) for internal (indoor) models or -4°F (-20°C) for external (outdoor)
models, when protected from direct wind exposure. Because of the “wind-chill” effect, any wind or
circulation of the air on the water heater will reduce its ability to protect itself from freezing.
In the event of a power failure and/or gas interruption at temperatures below freezing, the water heater
should manually be drained of all water to prevent freezing damage. In addition, drain the condensate
trap, drain line and pressure relief valve.
Loss of freeze protection may result in water damage from a burst heat exchanger or water lines.
The water heater may be drained manually. However, it is highly recommended to install the optional
Drain Down Kit accessory that will enable the water heater to immediately drain upon loss of power (the
condensate trap and pressure relief valve are not affected by the Drain Down Kit and must be manually
drained).
The freeze protection features will not prevent the external piping and valves from freezing. It is
recommended that hot and cold water pipes be insulated. Pipe cover enclosures may be packed with
insulation for added freeze protection.
Figure 7: Freeze Protection Piping Diagram
Route Drain Per Local Code
Cold Water Supply Line
1/2 in. Normally Open Solenoid Valve
Hot Water Supply Line
3/4 in. Normally Closed Solenoid Valve
Legend
Vacuum Breaker
Pressure Relief Valve
Union
Check Valve
Ball Valve
Solenoid Valve
Drain Valve
* Position vacuum breaker above water heater.
Gas Supply
Freeze Protection Piping Diagram
Vacuum Breaker *
Vacuum Breaker
Drain Valve
Pressure Relief Valve
Union
Check Valve
Ball Valve
Solenoid Valve
1/2 in. Normally Open Solenoid Valve
Route Drain Per Local Code
Cold Water Supply LineHot Water
Supply
Line
3/4 in. Normally Closed Solenoid Valve
Vacuum Breaker
Freeze Protection Piping Diagram
Rinnai Tankless Water Heater Installation and Operation Manual 22
4.3.6 Clearances
Location Clearances to Combustibles
and Non-Combustibles
Top 2 in. (51 mm)
0 in. from vent components
Bottom/Ground 12 in. (305 mm)
Front 0 in.
Clearance for servicing is 24 in. (610 mm)
in front of water heater
Back 0 in.
Sides (Left and Right)2 in. (51 mm)
Add 0.25 in. (6.35 mm) for recess box
Vent
(Internal/Indoor Models)
0 in.
Front Exhaust
(External/Outdoor Models)
24 in. (610 mm)
Side
Top Top
Side
BottomBottom
FrontFront
Figure 8: Clearances
Table 6: Clearances
Rinnai Tankless Water Heater Installation and Operation Manual 23
4.3.7 Installation Location Checklist
Use this checklist to ensure you have selected the correct location for the water heater.
□The water heater is not exposed to corrosive compounds in the air.
□The water heater location complies with the required clearances.
□The planned combustion air and exhaust termination locations meet the required clearances.
□The water supply does not contain chemicals or exceed total hardness that will damage the
heat exchanger.
□A standard 3 prong 120 VAC, 60 Hz properly grounded wall outlet (for internal/indoor models)
or other 120 VAC, 60 Hz source is available.
□The installation must conform with local codes or, in the absence of local codes, with the
National Fuel Gas Code, ANSI Z221.3/NFPA 54, or the Natural Gas and Propane
Installation Code, CSA B149.1
Rinnai Tankless Water Heater Installation and Operation Manual 24
3. Insert the top bracket into the wall mounting
bracket. Make sure the wall mounting bracket
is attached to the wall and can hold the weight
of the water heater before you fully let go.
4.4 Mount the Water Heater to the Wall
4.4.1 Mount the Internal
(Indoor) Water Heater
You Will Need:
• Rinnai Tankless Water Heater
(Internal/Indoor Model)
• Wall Mounting Bracket
Supplied by Installer:
• Level
• 4 Screws for mounting bracket installation
Use appropriate screws for type of wall
constructions.
Instructions:
1. Hold the wall mounting bracket up against the
wall and use a level to make sure the bracket
is even. Proper operation requires the water
heater to be level.
2. Use four screws to secure the wall mounting
bracket to the wall (two screws on the far left
side and two screws on the far right side).
Use the appropriate screws for the wall
construction to secure the mounting bracket to
the wall between two studs.
Figure 10: Secure the bracket
Figure 11: Mount top bracket
Figure 9: Level the bracket
Rinnai Tankless Water Heater Installation and Operation Manual 25
4. Securely screw the top and bottom brackets
into the wall, making sure the screws are flush
with the wall.
• Use any of the holes in the top and bottom
brackets.
• Make sure the securing method is suffi-
cient to support the weight of the water
heater. Refer to the water heater weight in
section “3.4 Specifications.”
Top Bracket
Bottom
Bracket
4.4.2 Mount the External
(Outdoor) Water Heater
to the Wall
You Will Need:
• Rinnai Tankless Water Heater
(External/Outdoor Model)
Supplied by Installer:
• Level
• Screws for top and bottom bracket instal-
lation
Use appropriate screws for type of wall
construction.
Instructions:
1. Securely screw the top and bottom brackets
into the wall, making sure the screws are flush
with the wall.
• Use any of the holes in the top and bottom
brackets.
• Use a level (placed horizontally or ver-
tically) to make sure the water heater is
straight. Proper operation requires the
water heater to be level.
• Make sure the securing method is suffi-
cient to support the weight of the water
heater. Refer to the water heater weight in
section “3.4 Specifications.”
Figure 12: Mount bottom bracket
Figure 13: Mount water heater
The water heater must be installed in an
upright position. Do not install the water
heater upside down or on its side.
IMPORTANT
The water heater must be installed in an
upright position. Do not install the water
heater upside down or on its side.
IMPORTANT
Rinnai Tankless Water Heater Installation and Operation Manual 26
4.5 Vent the Water Heater
4.5.1 Guidelines
• Internal water heaters can be installed as
direct vent or non-direct vent applications.
• When installed as Direct Vent, refer to the
“Direct Vent Approved Vent Manufactur-
ers and Products” section (within section
“4.5.4 1. Direct Vent”) for a complete list of
approved vent manufacturers and prod-
ucts.
• When installed as Non-Direct Vent (Room
Air), the vent must be Category IV, listed
by a national recognized testing agency or
schedule 40 PVC when accepted by local
codes.
• Exhaust must be directly vented to the
outside. Combustion air can be provided
from outside (Direct Vent) or from room air
(Non-Direct Vent).
• If using room air (non-direct vent) for
combustion, ensure the required volume
of indoor air is available according to the
National Fuel Gas Code, ANSI Z223.1/
NFPA 54.
• Avoid dips or sags in horizontal vent runs
by installing supports per the vent manu-
facturer’s instructions.
• Support horizontal vent runs every 4 ft
(1.2 m) and all vertical vent runs every 6
ft (1.83 m) or as per vent manufacturer’s
instructions or local code requirements.
• Venting should be as direct as possible
with a minimum number of pipe fittings.
• For manufactured vent systems, vent con-
nections must be firmly pressed together
so that the connections form an air tight
seal. Follow the venting manufacturer’s
instructions.
• Refer to the PVC/CPVC manufacturer for
appropriate fittings, solvents or joining
methods.
• The vent piece connected to the water
heater must be secured with 1 self-tapping
screw.
• Refer to the instructions of the vent system
manufacturer for component assembly
instructions.
• If the vent system is to be enclosed, it is
suggested that the design of the enclosure
shall permit inspection of the vent system.
The design of such enclosure shall be
deemed acceptable by the trained and
qualified professional or the local inspec-
tor.
• Any issues resulting from improper vent
installation will not be covered by warranty.
• DO NOT use cellular core PVC/CPVC.
• DO NOT use Radel or galvanized material
to vent this appliance.
• DO NOT cover non-metallic vent pipe and
fittings with thermal insulation.
• DO NOT combine vent components from
different manufacturers.
• DO NOT reduce the vent diameter. Vent
diameter cannot be less than 2 in. (51
mm).
• DO NOT connect the venting system with
an existing vent or chimney.
• DO NOT common vent with the vent pipe
of any other manufacturer’s water heater
or appliance.
• Rinnai water heaters can only be com-
mon vented with Schedule 40 PVC/CPVC
or with a Rinnai certified common vent
system.
WARNING
Rinnai Tankless Water Heater Installation and Operation Manual 27
4.5.2 Venting Installation
Sequence
1. Install the water heater.
2. Determine the termination method—horizontal
or vertical, concentric, or twin pipes, etc.
3. Determine proper location for wall or roof
penetration for each termination.
4. Install termination assembly as described
in this manual or in the vent manufacturer’s
installation instructions.
5. Install air and vent piping from water heater to
termination.
6. Slope horizontal exhaust run towards the
water heater 1/4 in. per foot. DO NOT slope
combustion air pipe towards water heater.
7. Install vent supports and brackets allowing
for movement from expansion, or as per vent
manufacturer’s instructions or local code
requirements.
8. Install vent screen (supplied with water
heater) on PVC combustion air and exhaust
termination elbows as illustrated below.
• Press vent screen inside of termination
piece/elbow.
• Secure vent screen to the elbow with
screw provided.
4.5.3 Termination
Considerations
Check to determine whether local codes
supersede the following clearances:
• Avoid termination locations near a dryer
vent.
• Avoid termination locations near commer-
cial cooking exhaust.
• Avoid termination locations near any air
inlets.
• You must install a vent termination at least
12 in. above the ground or anticipated
snow level.
The vent for this appliance shall not terminate:
• Over public walkways.
• Near soffit vents or crawl space vents or
other areas where condensate or vapor
could create a nuisance or hazard or
cause property damage.
• Where condensate or vapor could cause
damage or could be detrimental to the
operation of regulators, pressure relief
valves, or other equipment.
Listed below are important considerations for
locating vent termination under a soffit (ventilated
or unventilated or eave vent; or to a deck or
porch):
• Do not install vent termination under a
soffit vent such that exhaust can enter the
soffit vent.
• Install vent termination such that exhaust
and rising moisture will not collect under
eaves. Discoloration to the exterior of the
building could occur if installed too close.
• Do not install the vent termination too
close under the soffit where it could pres-
ent recirculation of exhaust gases back
into the combustion air part of the termina-
tion.
Figure 14: Vent screen
Rinnai Tankless Water Heater Installation and Operation Manual 28
4.5.4 Venting Options
Three types of venting options are available:
1. Direct Vent (Concentric Pipe and Twin Pipe)
2. Non-Direct Vent (Room Air and External)
3. Common Vent (Indoor Unit Only. Direct Vent and Non/Direct/Room Air Vent)
Concentric Pipe
Combustion air and exhaust
vent directly through a single
concentric connection. Hot
exhaust exits through the interior
tube, while combustion air enters
through the outer layer.
Twin Pipe
Combustion air and
exhaust vent directly
through separate
penetrations.
Room Air
Room air is used for combustion
while exhaust vents to the
outside.
External (Outdoor)
External (outdoor) water
heater.
Direct Vent
Multiple water heaters sharing a combustion
air header and a separate exhaust header that
vents directly through separate penetrations to
the outside.
Non-Direct (Room Air) Vent
Multiple water heaters using room air for
combustion while sharing an exhaust header
that vents directly to the outside.
Figure 15: Concentric Pipe Figure 16: Twin Pipe
Figure 17: Room Air Figure 18: External
Figure 19: Common Vent, Direct Vent Figure 20: Common Vent, Room Air
Rinnai Tankless Water Heater Installation and Operation Manual 29
1. Direct Vent (Concentric Pipe and Twin Pipe)
Direct Vent Approved Vent Manufacturers and Products
Following is a list of vent components and terminations for Direct Vent installations. Install the correct
venting for your model according to the venting manufacturer’s instructions and the guidelines below. The
information below is correct at time of publication and is subject to change without notice. Contact the
vent manufacturer for questions related to the vent system, products, part numbers and instructions.
Manufacturer Phone Web Site
Ubbink 800-621-9419 www.rinnai.us
Centrotherm 877-434-3432 www.centrotherm.us.com
Heat-Fab 800-772-0739 www.heatfab.com
Metal Fab 800-835-2830 www.metal-fabinc.com
IPEX U.S.: 800-463-9572
Canada: 866-473-9462
www.ipexamerica.com
www.ipexinc.com
DuraVent 800-835-4429 www.duravent.com
Royal 800-232-5690 www.royalbuildingproducts.com
Ecco Manufacturing 877-955-4805 www.eccomfg.com
DiversiTech 800-995-2222 www.diversitech.com
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2 in. /4 in. CONCENTRIC VENT TERMINATIONS
UB
B
I
N
K
US/ Canada
229031/ 229012NPP
229032/ 229013NPP
2/4 Condensing Horizontal Termination Kit 12 in.
2/4 Condensing Horizontal Termination Kit 21 in. 5
224359/224356NPP 2/4 Condensing Roof Discharge Termination 20
in. above roof 5
710202NPP 2/4 Condensing 90 Degree Diverter Nose (Use
with Wall Terminal)5
710215NPP 2/4 Condensing 45 Degree Diverter Nose (Use
with Wall Terminal)5
IP
E
X
1906005, 197040
FGV Concentric Vent Kit (16 in. length)201906005PVC
(Order from Rinnai)
196105, 197033
FGV Concentric Vent Kit (16 in. length)20196105PVC
(Order from Rinnai)
196125
FGV Concentric Vent Kit (40 in. length)20196125PVC
(Order from Rinnai)
Table 7: Approved Vent Manufacturers
Table 8: Approved Vent Products
Rinnai Tankless Water Heater Installation and Operation Manual 30
1. Direct Vent (Concentric Pipe and Twin Pipe)
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2 in. /4 in. CONCENTRIC VENT TERMINATIONS (continued)
RO
Y
A
L
52CVKGS6502 PVC Concentric Vent Kit 2 in. x 16 in.20
52CVKGVS6502-28 PVC Concentric Vent Kit 2 in. x 28 in. 20
52CVKGVS6502-40 PVC Concentric Vent Kit 2 in. x 40 in. 20
CE
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R
O
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H
E
R
M
ICRT2439 2 in. x 4 in. Concentric Roof Termination 20
DU
R
A
V
E
N
T
2PPS-VKL/VK-TCL FGV Concentric Vent Kit (16 in. length)20
2PPS-HKL 2 in. x 4 in. Horizontal Termination
Kit-Concentric 20
EC
C
O
190288 2 in. x 4 in. Concentric Horizontal
Termination 5
190295 2 in. x 4 in. Concentric Vertical
Termination 5
DI
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S
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T
E
C
H
CVENT-2 2 in. x 4 in. Concentric Horizontal
Termination 20
Rinnai Tankless Water Heater Installation and Operation Manual 31
1. Direct Vent (Concentric Pipe and Twin Pipe)
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3 in. /5 in. CONCENTRIC VENT TERMINATIONS
UB
B
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223176PP
223177PP
3/5 Condensing Horizontal Termination Kit 12 in.
3/5 Condensing Horizontal Termination Kit 21 in.5
223186PP 3/5 Condensing Horizontal Diverter Termination
Kit 19 in. 16
224047PP 3/5 Condensing Raised Horizontal Termination
Kit 24
184162PP 3/5 Condensing Roof Discharge Termination 20
in. above roof 5
IP
E
X
196006, 197009
FGV Concentric Vent Kit 3 in. x 20 in.20196006PVC
(Order from Rinnai)
196106, 197107
FGV Concentric Vent Kit 3 in. x 32 in.20196106PVC
(Order from Rinnai)
196116, 197117
FGV Concentric Vent Kit 3 in. x 44 in.20196116PVC
(Order from Rinnai)
RO
Y
A
L
52CVKGVS6503(PVC)/
52CVKGVSF9003(CPVC)PVC/CPVC Concentric Vent Kit 3 in. x 20 in.20
52CVKGVS6503-32(PVC)/
52CVKGVSF9003-32(CPVC)PVC/CPVC Concentric Vent Kit 3 in. x 32 in.20
52CVKGVS6503-44(PVC)/
52CVKGVSF9003-44(CPVC)PVC/CPVC Concentric Vent Kit 3 in. x 44 in.20
HE
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SC03HT Horizontal Termination Adapter 20
SC03VT Vertical Termination Adapter 20
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ICRT3539 3 in./5 in. Concentric Roof Termination PPs-UV 20
Rinnai Tankless Water Heater Installation and Operation Manual 32
1. Direct Vent (Concentric Pipe and Twin Pipe)
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3 in. /5 in. CONCENTRIC VENT TERMINATIONS (Continued)
ME
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F
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3CGRLSV Vertical Adapter 1
3CGRLSH Horizontal Adapter 6
3CGRVT Vertical Termination 5
3CGRHT 3 in. x 5 in. Vertical Termination Cap Kit-
Concentric 16
DU
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E
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T
3PPS-VKL/VK-TCL 3 in. x 5 in. Vertical Termination Cap Kit-
Concentric 20
3PPS-HKL 3 in. x 5 in. Horizontal Termination Kit-
Concentric 20
EC
C
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190388 3 in. x 5 in. Concentric
Horizontal Termination 5
190395 3 in. x 5 in. Concentric Vertical Termination 5
DI
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CVENT-3 3 in. x 5 in. Concentric
Horizontal Termination 20
Rinnai Tankless Water Heater Installation and Operation Manual 33
1. Direct Vent (Concentric Pipe and Twin Pipe)
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2 in. TWIN PIPE TERMINATIONS
CE
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ISELL0287UV 2 in. 87° Long PPS-UV 6
ISTT0220 2 in. Termination Tee 6
ISLPT0202 2 in. Low Profile Wall Termination 5
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2PPS-HTPL 2 in. Twin Pipe Termination 10
2PPS-HSTL 2 in. Single Horizontal Termination 6
2PPS-TBL 2 in. Black UV Resistant Tee 5
IP
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196984
FGV PVC Low Profile Termination Kit 5196984PVC
(Order from Rinnai)
081216 FGV PVC Wall Termination Kit 16
RO
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52SWVKGVS6502 PVC Side Wall Vent Kits 5
52WTVKGVS6502 PVC Wall Vent Kits 16
DI
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HVENT-2 2 in. Low Profile Horizontal Vent Kit 5
Rinnai Tankless Water Heater Installation and Operation Manual 34
1. Direct Vent (Concentric Pipe and Twin Pipe)
Ma
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ISELL0387UV 3 in. 87° Long PPS-UV 6
ISTT0320 3 in. Termination Tee 6
ISLPT0303 3 in. Low Profile Wall Termination 5
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3PPS-HTPL 3 in. Twin Pipe Termination 10
3PPS-HSTL 3 in. Single Horizontal Termination 5
3PPS-TBL 3 in. Black UV Resistant Tee 6
IP
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196985
FGV PVC Low Profile Termination Kit 5196985PVC
(Order from Rinnai)
081219 FGV PVC Wall Termination Kit 16
RO
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52SWVKGVS6503 PVC Side Wall Vent Kits 5
52WTVKGVS6503 PVC Wall Vent Kits 16
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HVENT-3 3 in. Low Profile Horizontal Vent Kit 5
Rinnai Tankless Water Heater Installation and Operation Manual 35
Pr
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Vent Screen N/A
Tee 5
90° Elbow 5
45° Elbow 2.5
Approved PVC/CPVC Vent and Air Piping Material
Item Material Standard for Installation in North America
United States Canada
Thermoplastic Piping Materials
Vent or Combustion Air
Intake Pipe and Fittings
PVC Schedule 40 ANSI/ASTM D1785
Thermoplastic vent pipe
must be certified to ULC
S636. Intake pipe may be
of the materials listed in
this table.
PVC-DWV ANSI/ASTM D2665
CPVC Schedule 40 ANSI/ASTM F441
PVC Pipe Cement and
Primer
PVC ANSI/ASTM D2564
CPVC Schedule 40 ANSI/ASTM F493
Non-Metallic Vent Material
ABS SCH 40 DWV ASTM-D2661 or CSA B181.1 NOT PERMITTED
PVC Vent Screens
Termination Vent Screens Polyethylene
• 2 in. Vent Screens (included in carton box) (IPEX
Part Number: 196050)
• 3 in. Vent Screens (IPEX Part Number: 196051)
Exhaust piping must be of solid core material. Refer to the PVC/CPVC manufacturer for appropriate
fittings, solvents or joining methods.
Table 11: Approved Venting Materials by Manufacturer
Manufacturer Vent Material
Ubbink PVC (Outer Vent), Polypropylene (Inner Vent)
Centrotherm Polypropylene
Heat-Fab Metal
Metal Fab Metal
IPEX PVC/CPVC
DuraVent Polypropylene
Royal PVC
ECCO Manufacturing Polypropylene
DiversiTech PVC/CPVC
Table 9: Various 2 in. or 3 in. Schedule 40 PVC/CPVC Terminations
Table 10: Approved PVC/CPVC Vent and Air Piping Material
Rinnai Tankless Water Heater Installation and Operation Manual 36
4.5.5 Direct Vent (Concentric and Twin Pipe):
Termination Clearances
The information below applies to Concentric and Twin Pipe.
Canadian Installations1
(CSA B149.1)
U.S. Installations2
(ANSI Z223.1/NFPA 54)
Ref Description Direct Vent (Indoor Unit)Direct Vent (Indoor Unit)
A Clearance above grade, veranda, porch, deck, or balcony 12 in. (30 cm)12 in. (30 cm)
B Clearance to window or door that may be opened 36 in. (91 cm)12 in. (30 cm)
C Clearance to permanently closed window **
D Vertical clearance to ventilated soffit, located above the terminal within a horizontal distance of 2 ft (61 cm) from the center line of the terminal **
E Clearance to unventilated soffit **
F Clearance to outside corner **
G Clearance to inside corner *
H Clearance to each side of center line extended above meter/regulator assembly 3 ft. (91 cm) within a height of 15 ft. (4.6 m) 12 in.
I Clearance to service regulator vent outlet 3 ft. 91 cm)*
J Clearance to non-mechanical air supply inlet to building or the combustion air inlet to any other appliance 36 in. (91 cm)12 in. (30 cm)
K Clearance to a mechanical air supply inlet 6 ft (1.83 m)3 ft (91 cm) above if within 10 ft (3 m) horizontally
L Clearance above paved sidewalk or paved driveway located on public property 7 ft (2.13 m) [1]
Vents for Category II and IV appliances cannot be located above public walkways or other areas where condensate or vapor can cause a nuisance or hazard.
M Clearance under veranda, porch, deck, or balcony 12 in. (30 cm) [2]*
Clearance to opposite wall is 24 in. (60 cm).
[1] A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
[2] Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
[3] If locally adopted installation codes specify clearances different than those illustrated, then the most stringent clearance shall prevail.
*Clearances are in accordance with local installation codes and the requirements of the gas supplier. (Dégagement conforme aux codes d’installation locaux et aux exigences du foumisseur de gaz.)
AIR SUPPLY INLET
VENT TERMINAL
AREA WHERE TERMINAL
IS NOT PERMITTTED
X
V
SNOW
TERMINATION
Clearance in
Ref. A also
applies to
anticipated
snow line
Regulator vent outlet
AIR SUPPLY INLET
VENT TERMINAL
AREA WHERE TERMINAL
IS NOT PERMITTTED
X
V
SNOW
TERMINATION
Clearance in
Ref. A also
applies to
anticipated
snow line
Figure 21: Direct Vent Termination Clearances
Table 12
Notes: 1In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
I
Rinnai Tankless Water Heater Installation and Operation Manual 37
1. Direct Vent (Concentric Pipe)
Concentric Pipe Overview
Combustion air and exhaust vent directly
through a single concentric connection.
Hot exhaust exits through the interior tube,
while combustion air enters through the
outer layer.
Combustion
air
Exhaust
Combustion
air
Figure 22: Concentric Pipe Termination Clearances
Inside
Corner
12 in. (0.30 m)
12 in. (0.30 m)
60 in. (1.52 m) ver�cally between terminals
60 in. (1.52 m)
Note: 24 in. (0.61 m)
to wall or parapet
12 in. (0.30 m)
Figure 24: Between terminals at
different levels
Figure 25: Between terminals at same
level
All terminations (horizontal and/or vertical) must terminate 12 in. (0.30 m) above grade or anticipated
snow level.
Corner
Figure 23: Concentric Pipe
Rinnai Tankless Water Heater Installation and Operation Manual 38
Concentric Pipe: Installation
Instructions
1. Remove and discard screw from concentric
flue connection.
2. Remove exhaust adapter ring (discard for
concentric venting configurations.)
3. Install the concentric vent. Ensure it is properly
seated.
4. Secure the vent pipe to the concentric flue
connection with the supplied screw.
Concentric Vent
Mount Concentric Pipe Through Wall
If venting through an exterior wall, align the wall
mounting bracket template (located in literature
bag) to the wall and follow instructions on the
template for appropriate vent hole location. Use
a level to make sure the wall mounting bracket is
even and level.
Wall Mounting
Bracket Template
LevelWall Mounting
Bracket
Table 13: Concentric Pipe: Vent Applications
Horizontal Wall Terminations
2 in. x 4 in.
3 in. x 5 in.
Vertical Roof
Terminations
2 in. x 4 in.
and
3 in. x 5 in.
Table 14: Concentric Pipe: Maximum Vent Length
Concentric Vent Maximum Equivalent Length
Vent Sizes 2 in. x 4 in. 3 in. x 5 in.
Vent Lengths 65 ft (20 m)150 ft (46 m)
• 45° elbow is equivalent to 3 ft (1 m)
• 90° elbow is equivalent to 6 ft (2 m)
Figure 29
Figure 26
Figure 27
Figure 28
Figure 30
Install the venting termination according to the
diagrams and instructions in this manual. Slope
the venting 1/4 in. per foot toward the appliance
according to the vent manufacturer’s installation
instructions. Dispose of condensate per local
codes.
IMPORTANT
Rinnai Tankless Water Heater Installation and Operation Manual 39
1. Direct Vent (Twin Pipe)
Twin Pipe Overview
Combustion air and exhaust vent directly through separate penetrations.
Twin Pipe Termination Clearances
Exhaust
12 in. (0.30 m)
minimum above
combustion air
opening
12 in. (0.30 m)
minimum 12 in. (0.30 m)
minimum
Combustion
Air
12 in. (0.30 m) above
grade or anticipated
snow level
Roof
Figure 32: Twin Pipe Vertical
Termination of Multiple Water Heaters
Indicates area in which intake cannot be installed.
Minimum clearance for
Ground/Grade/Snow Level
Intake
60 in.
min
12 in.
min 12 in.
min
12 in.
min
12 in.
min
12 in.
min
IntakeIntake
Exhaust
Figure 33: Horizontal Vent and Combustion
Air Piping
Figure 31
Rinnai Tankless Water Heater Installation and Operation Manual 40
1. Direct Vent (Twin Pipe)
Twin Pipe Installation Instructions
The water heater is equipped with a 2 in. (51 mm)
pipe connection. With the use of a pipe reducer,
installers can use a 3 in. (76 mm) pipe for the
combustion air and exhaust.
1. Remove and discard the screw from the
combustion air vent connection.
2. Remove and discard the combustion air vent
cap.
3. Install the combustion air vent pipe. Ensure it
is properly seated.
Secure the combustion air vent pipe to the
combustion air vent connection with the
supplied screw.
4. Install the exhaust vent pipe. Ensure it is
properly seated.
Secure the exhaust vent pipe to the exhaust
adapter ring with the supplied screw.
Combustion Air Vent Pipe
Supplied screw
Exhaust Vent Pipe
DO NOT apply
PVC glues,
solvents, or cleaners to the water heater’s
combustion air or exhaust gasket
connections. Failure to correctly assemble the
components according to these
instructions may result in property
damage, personal injury, or death.
Supplied screw
Figure 34
Figure 35
Figure 36
Figure 37
WARNING
Rinnai Tankless Water Heater Installation and Operation Manual 41
This configuration requires the use of a Concentric Vent
Termination
2 in. or 3 in. PVC/
CPVC IPEX/ Royal
Concentric Side Wall
Termination Configuration
This configuration requires the use of a Concentric Vent
Termination
2 in. or 3 in. PVC/CPVC
IPEX/ Royal Concentric Vertical
Termination Configuration
2 in. or 3 in. Schedule
40 PVC/CPVC or ABS Snorkel
Termination Configuration
2 in. or 3 in. Schedule 40
PVC/CPVC or ABS Standard
upside down “U” Vertical
Termination Configuration
2 in. or 3 in. Schedule
40 PVC/CPVC or ABS Elbow
or Tee Side Wall
Termination Configuration
2 in. or 3 in. Schedule
40 PVC/CPVC or ABS Tee
Vertical Termination
Configuration
2 in. or 3 in. PVC
Low Profile Termination
Configuration
Exhaust and
combustion air
MUST NOT be
brought together
into a single
PVC pipe using
a pipe fitting.
1. Direct Vent (Twin Pipe)
Twin Pipe Example Vent Applications
Slope horizontal exhaust 1/4 in. per foot towards the water heater. DO NOT slope combustion air pipe
towards the water heater.
Single Pipe
Combustion Air Exhaust
Twin Pipe Maximum Vent Length
Table 16:Twin Pipe Maximum Equivalent Length
Vent Sizes 2 in. (51 mm)3 in. (76 mm)
Vent Lengths 65 ft (20 m)150 ft (46 m)
• 45° elbow is equivalent to 3 ft (1 m)
• 90° elbow is equivalent to 6 ft (2 m)
Table 15: Twin Pipe Example Vent Applications
WARNING
Rinnai Tankless Water Heater Installation and Operation Manual 42
2. Non-Direct Vent (Room Air and External)
Room Air and External Termination Clearances
Canadian Installations1
(CSA B149.1)
U.S. Installations2
(ANSI Z223.1/NFPA 54)
Ref Description Other than direct vent (Outdoor unit and/or Room Air)Other than direct vent (Outdoor unit and/or Room Air)
A Clearance above grade, veranda, porch, deck, or balcony 12 in. (30 cm)12 in. (30 cm)
B Clearance to window or door that may be opened 36 in. (91 cm)4 ft (1.2 m) below or to side of opening; 1 ft (300 mm) above opening
C Clearance to permanently closed window **
D Vertical clearance to ventilated soffit, located above the terminal within a horizontal distance of 2 ft (61 cm) from the center line of the terminal **
E Clearance to unventilated soffit **
F Clearance to outside corner **
G Clearance to inside corner *12 in.
H Clearance to each side of center line extended above meter/regulator assembly 3 ft. (91 cm) within a height 15 ft. (4.6 m)*
I Clearance to service regulator vent outlet 3 ft. (91 cm)*
J Clearance to non-mechanical air supply inlet to building or the combustion air inlet to any other appliance 36 in. (91 cm)4 ft (1.2 m) below or to side of opening; 1 ft (300 mm) above opening
K Clearance to a mechanical air supply inlet 6 ft (1.83 m)3 ft (91 cm) above if within 10 ft (3 m) horizontally
L Clearance above paved sidewalk or paved driveway located on public property 7 ft (2.13 m) [1]
Vents for Category II and IV appliances cannot be located above public walkways or other areas where condensate or vapor can cause a nuisance or hazard.
M Clearance under veranda, porch, deck, or balcony 12 in. (30 cm) [2]*
Clearance to opposite wall is 24 in. (60 cm).
[1] A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings. [2] Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.[3] If locally adopted installation codes specify clearances different than those illustrated, then the most stringent clearance shall prevail.
*Clearances are in accordance with local installation codes and the requirements of the gas supplier. (Dégagement conforme aux codes d’installation locaux et aux exigences du foumisseur de gaz.)
AIR SUPPLY INLET
VENT TERMINAL
AREA WHERE TERMINAL
IS NOT PERMITTTED
X
V
SNOW
TERMINATION
Clearance in
Ref. A also
applies to
anticipated
snow line
Regulator vent outlet
AIR SUPPLY INLET
VENT TERMINAL
AREA WHERE TERMINAL
IS NOT PERMITTTED
X
V
SNOW
TERMINATION
Clearance in
Ref. A also
applies to
anticipated
snow line
Figure 38: Room Air and External Termination Clearances
Notes: 1In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code.
2In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code.
Table 17
I
Rinnai Tankless Water Heater Installation and Operation Manual 43
Termination Clearances for External (Outdoor) Water Heaters
36 in. (0.91 m) to ventilated or unventilated
soffit or eve vent; or to a deck or porch
60 in. (1.52 m) vertically between terminals
2 in.
12 in.
(0.30 m)
Corner
Exhaust Termination Clearances for Internal (Indoor) Room Air Applications
60 in. (1.52 m) vertically between terminals
12 in.
12 in.
(0.30 m)
Corner
Figure 39
Figure 40
• Installation of Non-Direct Vent (Room Air) must use listed category IV venting.
• All terminations (horizontal and/or vertical) must terminate 12 in. above grade or anticipated
snow level.
NOTE
Rinnai Tankless Water Heater Installation and Operation Manual 44
Combustion air must be free of corrosive chemicals. Do not provide combustion air from
corrosive environment. Appliance failure due to corrosive air is not covered by warranty.
IMPORTANT
Room Air: Combustion Air
This water heater requires adequate combustion air for ventilation and
dilution of flue gases. Failure to provide adequate combustion air can result
in unit failure, fire, explosion, serious bodily injury or death. Use the following methods to ensure
adequate combustion air is available for correct and safe operation of this water heater.
For applications containing corrosive indoor air, this appliance must be installed as direct vent. DO NOT
use room air in applications where combustion air contains acid forming chemicals such as sulfur, fluorine
and chlorine. These chemicals have been found to cause rapid damage and decay and can become
toxic when used as combustion air in gas appliances. Such chemicals can be found in, but not limited to
bleach, ammonia, cat litter, aerosol sprays, cleaning solvents, varnish, paint and air fresheners. Do not
store these products or similar products in the vicinity of this water heater.
Unconfined Space
An unconfined space is defined in National Fuel Gas Code, ANSI Z223.1/NFPA 54 as “a space whose
volume is not less than 50 cubic feet per 1000 Btu/hr (4.8 m3 per kW per hour) of the aggregate input
rating of all appliances installed in that space. Rooms communicating directly with the space in which
the appliances are installed, through openings not furnished with doors, are considered a part of the
unconfined space.” If the “unconfined space” containing the appliance(s) is in a building with tight
construction, additional outside air may be required for proper operation. Outside air openings should be
sized the same as for a confined space.
Confined Space
A confined space is defined in the National Fuel Gas Code, ANSI Z223.1/NFPA 54 as “a space whose
volume is less than 50 cubic feet per 1000 Btu/hr (4.8 m3 per kW per hour) of the aggregate input rating
of all appliances installed in that space.” Examples include a small room, closet, alcove, utility room, etc.
A confined space must have two combustion air openings. Size the combustion air openings based on
the BTU input for all gas utilization equipment in the space and the method by which combustion air is
supplied.
Using Indoor Air For Combustion: When using air from other room(s) in the building, the total volume of
the room(s) must be of adequate volume (Greater than 50 cubic feet per 1000 Btu/hr). Combustion air
openings between joining rooms must have at least 1 square inch of free area for each 1000 Btu/h, but
not less than 100 square inches each.
Using Outdoor Air For Combustion
Outdoor air can be provided to a confined space through two permanent openings, one commencing
within 12 in. (0.30 m) of the top and one commencing within 12 in. (0.30 m) of the bottom, of the confined
space. The openings shall communicate to the outside by one of two ways.
When communicating directly with the outdoors through horizontal ducts, each opening shall have
a minimum free area of 1 in2/2000 Btu/hr (1100 mm2/kW) of total input rating of all appliances in the
confined space.
WARNING
If ducts are used, the cross sectional area of the duct must be greater than or equal to the required
free area of the openings to which they are connected.
NOTE
Rinnai Tankless Water Heater Installation and Operation Manual 45
□Verify all combustion air opening sizes are correct.
□Ensure that the Combustion Air Requirements are followed that will provide sufficient
combustion air for the appliance.
□DO NOT use room air for combustion in applications where the indoor air is corrosive.
□Verify that adequate combustion air is available for all appliances installed in the space.
□Installation complies with National Fuel Gas Code, ANSI Z223.1/NFPA 54 as well as local and
state regulations therein.
Figure 41
Louvers and Grills
Adequate combustion air is required for all gas utilizing equipment in the location. Therefore, proper sizing
of permanent openings, such as louvers or grills, must be considered to maintain the required free area.
If the free area of the louver or grill design is not available, assume wood louvers will have 25% free
area and metal louvers or grills will have 75% free area. Under no circumstance should the louver, grill or
screen have openings smaller than 1/4 in.
Example: Wood: 10 in. x 12 in. x 0.25 = 30 in.2
Metal: 10 in. x 12 in. x 0.75 = 90 in.2
Location
To maintain proper circulation of combustion air, two permanent
openings (one upper, one lower) must be positioned in
confined spaces. The upper shall be within 12 in. (0.30 m)
of the top of the confined space and the lower opening shall
be within 12 in. (0.30 m) of the bottom of the confined space.
Openings must be positioned so as to never be obstructed.
12 in.
(300 mm)
10 in.
(250 mm)
Combustion air provided to the appliance should not be taken from any area of the structure that may
produce a negative pressure (i.e. exhaust fans, powered ventilation fans).
TO PREVENT POSSIBLE PERSONAL INJURY OR DEATH DUE TO AS-
PHYXIATION, COMMON VENTING WITH OTHER MANUFACTURER’S
INDUCED DRAFT APPLIANCES IS NOT ALLOWED.
Checklist for Combustion Air and Venting Requirements
WARNING
Rinnai Tankless Water Heater Installation and Operation Manual 46
Vent Screen
Elbow
Supplied screw
Supplied screw
Combustion Air Vent Pipe
Exhaust Vent Pipe
Supplied screw
Room Air: Installation Instructions
1. Remove and discard screw from combustion
air vent connection (Figure 42).
2. Remove and discard the combustion air vent cap
(Figure 43).
3. Install the combustion air vent pipe. Ensure
it is properly seated.
Secure the combustion air vent pipe to the
combustion air vent connection with the
supplied screw (Figure 44).
4. Place the vent screen or room air screen
inside elbow and secure with the supplied
screw. Use the room air screen for
environments where room air is dusty (Figure 45).
Note:
• 2 in vent screen supplied with water heater.
• Room air screen is available as an
accessory.
5. Install the exhaust vent pipe. Ensure it is
properly seated.
Secure the exhaust vent pipe to the exhaust
adapter ring with the supplied screw (Figure 46).
Figure 42
Figure 43
Figure 44
Figure 45
Figure 46
Rinnai Tankless Water Heater Installation and Operation Manual 47
Room Air: Example Vent Applications
2 in. or 3 in. Schedule
40 PVC/CPVC or ABS
Snorkel Termination
Configuration
2 in. or 3 in. Schedule 40
PVC/CPVC or ABS Standard
Upside Down “U” Vertical
Termination Configuration
2 in. or 3 in. Schedule 40
PVC/CPVC or ABS Elbow or Tee
Side Wall Termination
Configuration
2 in. or 3 in. Schedule 40
PVC/CPVC or ABS Tee
Vertical Termination
Configuration
Slope horizontal exhaust 1/4 in. per foot towards
the water heater.
Ubbink flexible venting
approved for vertical
non-direct vent (room
air) applications only.
Refer to the flex vent
manual for further
details.
PP Flex Venting
B-Vent Pipe
4 in. (102 mm)
Table 19: Room Air Maximum Equivalent Length
Vent Sizes 2 in. (51 mm)3 in. (76 mm)2 in. (51 mm) Ubbink Flex
Vent Length 65 ft (20 m)150 ft (46 m)50 ft. (15 m)
• 45° elbow is equivalent to 3 ft (1 m)
• 90° elbow is equivalent to 6 ft (2 m)
Room Air: Maximum Vent Length
Table 18
Rinnai Tankless Water Heater Installation and Operation Manual 48
Room Air: Manufactured (Mobile) Home
For Installation in a Manufactured Home (Mobile Home)
Roof Termination
Roof Flashing
Top and Bottom
Mounting Brackets
PVC Elbow with
Vent Screen
Condensate Drain
Pressure Relief Valve
Hot Water Outlet
Door
Gas Supply
Cold Water Inlet
Louvered Opening
6 in. (152 mm) Maximum
To Suitable Drain
Figure 47: Installation Enclosure with Louvered Door for
Manufactured Home Applications
• Combustion air must not be
supplied from occupied spaces of
the manufactured home. Access
panels, doors or opening of any
kind are not permitted between
the installation enclosure and the
inside of the manufactured home.
• The installation enclosure must
include an exterior access door
incorporating a single opening
positioned a maximum of 6 in.
(152 mm) above the lower edge
of the door. The opening in the
access door must be metal with
no less than 1/4 in. (6.4 mm)
mesh.
• The water heater is to be secured
to the wall of the manufactured
home using the integrated mount-
ing brackets on the back side of
the water heater.
Model Input
Btu/h
Minimum Required
Area
Example Opening
Size (LxH)
RU199i 199,000 200 in2
(0.129 m2)
20 in. x 10 in.
(508 mm x 254 mm)
RU180i 180,000 180 in2
(0.116 m2)
18 in. x 10 in.
(457 mm x 254 mm)
RU160i 160,000 160 in2
(0.103 m2)
16 in. x 10 in.
(406 mm x 254 mm)
RU130i 130,000 130 in2
(0.0839 m2)
13 in. x 10 in.
(330 mm x 254 mm)
Use the following chart to identify the minimum required size of
the opening in the access door.
Figure 48: Pipe connections on bottom
of water heater
Table 20
Rinnai Tankless Water Heater Installation and Operation Manual 49
3. Common Vent (Indoor Units Only. Direct Vent and Non-Direct/Room Air Vent)
Common venting allows multiple RInnai Tankless Water
Heaters to share the same vent system. When operating
multiple water heaters in a common venting system, it
is recommended to use Rinnai’s EZConnect™ cable
(purchased separately) which electronically connect two
water heaters so they function as one hot water source.
Do not common vent this water heater with any other water
heater or appliance.
Common Vent Maximum Equivalent Vent Lengths
Common vent equivalent lengths include polypropylene pipe (PP) or PVC in a back-to-back or inline
configuration.
For the table below:
• Header is the main vent pipe into which sever-
al vents connect.
• Vent Length is the distance from the end of the
header to the vent termination.
• Maximum vent length starts at the end of the
header system.
Vent Length
Figure 49: Sample Inline, Freestanding
Configuration
Water Heater Model # Water
Heaters Max System Btu/hr Vent Diameter
3 in. 4 in. 6 in.
RU199i (REU-N3237FF-US)
RU180i (REU-N2934FF-US)
2 398,000
360,000
65 ft
(20 m)
150 ft
(46 m)
150 ft
(46 m)
RU160i (REU-N2530FF-US)
RU130i (REU-N2024FF-US)
2 320,000
260,000
90 ft
(27 m)
150 ft
(46 m)
150 ft
(46 m)
Header
Figure 50
Table 21: Common Vent Maximum Vent Length
Rinnai Tankless Water Heater Installation and Operation Manual 50
4.6 Connect Water Supply
4.6.1 Guidelines
• The piping (including soldering materials) and components connected to this appliance must be
approved for use in potable water systems.
• Purge the water line to remove all debris and air. Debris will damage the water heater.
• The appliance must not be connected to a system that was previously used with a non-potable
water heating appliance.
• Ensure that the water filter on the water heater is clean and installed.
• DO NOT introduce toxic chemicals such as those used for boiler water treatment to the potable
water used for space heating.
4.6.2 Instructions
To connect the water supply, follow the instructions below.
1. Plumb the cold water supply line to the water heater on the 3/4 in. MNPT connection at the bottom of
the water heater marked “COLD.”
2. Plumb the hot water supply line to the 3/4 in. MNPT connection marked “HOT.”
3. If a pipe cover will be installed, make sure water lines to the water heater fit within the confinements
of the pipe cover.
Gas Supply
3/4"Cold Water Supply Line3/4" Hot Water Supply Line
RinnaiEquipment List
RinnaiWaterHeaters
RIK-KIT (Optional)
(3/4" Fittings Include:2 Unions, 2 Ball Valves,2 Drain Valves and
1 Pressure Relief Valve.)
QTY
1
1
3/4"Gas Connection
For Building Fixtures
Pressure Relief Valve
3/4" Ball Valve
3/4"Union
Check Valve
S
Pressure Regulator
Circulating Pump
Solenoid Valve
Boiler Drain Valve
KEY This is not an engineered drawing. It is intended only as a guide and not
as a replacement for professionally engineered project drawings.This
drawing is not intended to describe a complete system. It is up to the
contractor/engineer to determine the necessary components and
configuration of the particular system being installed.This drawing does
not imply compliance with local building code requirements. It is the
responsibility of the contractor/engineer to ensure installation is in
accordance with all local building codes. Confer with local building
officials before installation.
Condensate drain line
Condensate
drain
Gas Supply
3/4"Cold Water Supply Line3/4" Hot Water Supply Line
Rinnai
Equipment List
Rinnai
Water Heaters
RIK-KIT (Optional)
(3/4" Fittings Include:
2 Unions, 2 Ball Valves,2 Drain Valves and1Pressure Relief Valve.)
QTY
1
1
3/4"Gas Connection
For Building Fixtures
Pressure Relief Valve
3/4" Ball Valve
3/4"Union
Check Valve
S
Pressure Regulator
Circulating Pump
Solenoid Valve
Boiler Drain Valve
KEY This is not an engineered drawing. It is intended only as a guide and not
as a replacement for professionally engineered project drawings.This
drawing is not intended to describe a complete system. It is up to the
contractor/engineer to determine the necessary components and
configuration of the particular system being installed.This drawing does
not imply compliance with local building code requirements. It is the
responsibility of the contractor/engineer to ensure installation is in
accordance with all local building codes. Confer with local building
officials before installation.
Condensate drain line
Condensate
drain
The condensate drain pipe (along its entire
length) must be at least the same diameter
as the drain line (1/2 in. NPT).
Refer to section “4.9 Connect Condensate
Drain” for more information.
PIPING DIAGRAM FOR BASIC INSTALLATION
Figure 51
Water connections to the water heater should follow all state and local plumbing codes. If this is a
standard installation, refer to the “Piping Diagram for Basic Installation” below.
IMPORTANT
Rinnai Tankless Water Heater Installation and Operation Manual 51
4.7 Install the Isolation Valves
Isolation valves (included with water heater) provide the ability to isolate the water heater from the
structure’s plumbing and allow quick and easy access to flush the heat exchanger. The supplied isolation
valves meet American National Standard (ANSI Z21.10.3) / Canadian Standard (CSA 4.3) and are ANSI/
NSF 61 approved for potable water.
4.7.1 Instructions
1. Position the Hot Isolation Valve (Red) below the Hot Outlet side of the water heater.
2. Hand tighten the Swivel Nut of the Hot Isolation Valve (Red) to the Hot Outlet side of the water
heater.
3. Rotate the Drain Valve to an accessible position. With a wrench, tighten the Swivel Nut to the water
heater.
4. Repeat steps 1-3 for the Cold Isolation Valve (Blue).
5. Connect the Cold Isolation Valve (Blue) to the Cold Water Supply Line.
6. Connect the Hot Isolation Valve (Red) to the Hot Water Supply Line.
7. Ensure that both Drain Valves are in the closed position before turning on water supply.
Hot Outlet
Cold Inlet
Swivel Nut (Integrated Gasket)
Drain Valve
Hot Isolation Valve
(Red)Cold Isolation Valve
(Blue)
Figure 52: Install Isolation Valves
Rinnai Tankless Water Heater Installation and Operation Manual 52
4.8 Install Pressure Relief Valve
Water discharged from the pressure relief valve could cause severe burns
instantly or death from scalds.
4.8.1 Guidelines
An approved pressure relief valve is required
by the American National Standard (ANSI
Z21.10.3) for all water heating systems and shall
be accessible for servicing. When connecting a
pressure relief valve, follow the guidelines below:
• The pressure relief valve must comply with
the standard for Relief Valves and Auto-
matic Gas Shutoff Devices for Hot Water
Supply Systems ANSI Z21.22 and /or the
standard Temperature, Pressure, Tem-
perature and Pressure Relief Valves and
Vacuum Relief Valves, CAN1-4.4.
• The pressure relief valve must be rated
up to 150 psi and to at least the maximum
Btu/hr of the appliance.
• The discharge from the pressure relief
valve should be piped to the ground or into
a drain system per local codes.
• The pressure relief valve must be man-
ually operated once a year to check for
correct operation.
• The discharge line from the pressure relief
valve should pitch downward and termi-
nate 6 in. (152 mm) above drains where
discharge will be clearly visible.
• The discharge end of the line shall be plain
(unthreaded) and a minimum of 3/4 in.
nominal pipe diameter. The discharge line
material must be suitable for water at least
180° Fahrenheit.
• The pressure relief valve is assembled to
the pressure relief valve adapter as illus-
trated on the next page. DO NOT place
any other valve or shut off device between
the pressure relief valve and the water
heater.
• If a pressure relief valve discharges peri-
odically, this may be due to thermal expan-
sion in a closed water supply system. Con-
tact the water supplier or local plumbing
inspector on how to correct this situation.
Do not plug the pressure relief valve.
• The American National Standard (ANSI
Z21.10.3) does not require a combination
temperature and pressure relief valve for
this appliance. However, local codes may
require a combination temperature and
pressure relief valve.
• Protect pressure relief valve and pressure
relief valve discharge line from freezing.
Do not plug or restrict flow of the pressure
relief valve.
• DO NOT plumb the pressure relief valve
with the condensate drain; both must be
plumbed independently to drain.
• DO NOT plug the pressure relief valve and
do not install any reducing fittings or other
restrictions in the relief line. The pressure
relief line should allow for complete drain-
age of the valve and the line.
• DO NOT place any other valve or shutoff
device between the pressure relief valve
and the water heater.
WARNING
Rinnai Tankless Water Heater Installation and Operation Manual 53
4.8.2 Instructions
To install the pressure relief valve, follow the steps below.
1. On the bottom of the tankless water heater, hand tighten the Pressure Relief Valve Assembly and
Gasket to the Pressure Relief Valve Union Fitting.
2. Rotate the Pressure Relief Valve Assembly to the desired accessible position. With a wrench,
tighten the Union Nut to the Pressure Relief Valve Union Fitting.
Pressure Relief Valve
Union Fitting
Gasket
Union Nut Pressure Relief Valve Assembly
The Pressure Relief Valve
Assembly can rotate 360°
to accommodate the
application.
Figure 53: Pressure Relief Valve Assembly
• Do not use pipe dope or thread sealant on union fitting with gasket.
• Be careful not to lose or throw away the gasket.
IMPORTANT
Rinnai Tankless Water Heater Installation and Operation Manual 54
4.9 Connect Condensate Drain
4.9.1 Guidelines
To prevent condensate damage, follow these
guidelines:
• Do not plumb the condensate drain with
the pressure relief valve; both must be
plumbed independently to drain.
• All condensate must drain and be dis-
posed of according to local codes.
• Use only corrosion resistant materials for
the condensate drain lines such as PVC
pipe or plastic hose.
• The condensate drain pipe (along its entire
length) must be at least the same diameter
as the drain line (1/2 in. MNPT).
• Condensation drain lines installed in areas
that are subject to freezing temperatures
should be wrapped with an approved sup-
plemental heat source. Install per manu-
facturer’s instructions.
• Slope the condensate drain lines toward
the inside floor drain or condensate pump.
• The end of the condensate drain pipe
should be open to the atmosphere. The
end should not be under water or other
substances.
• For external (outdoor) installations, to min-
imize freezing of the condensate, run the
condensate drain line through an interior
wall or between insulation and an interior
wall.
• If a floor drain is not available or the drain
is above the level of the condensate drain,
a condensate pump should be installed.
Pipe open to
atmosphere
Pipe submerged
in water
CORRECT INCORRECT
Water
Level
Water
Level
• A condensate neutralizer kit is available
from Rinnai. The kit allows condensate to
flow through neutralizing media that raises
the pH of the condensate to a level that
will help prevent corrosion of the drain and
public sewer system. Refer to section “3.6
Accessories” for more information.
• The condensate drain pipe should be as
short as possible and have a downward
pitch.
• The condensate trap will automatically
prime (self-prime) during operation of the
water heater as condensate forms. Con-
densate draining from the water heater
indicates that the trap is full and that there
is no blockage in the condensate drain. It
is not necessary to add water to the con-
densate trap.
• DO NOT connect the condensate drain
line with an air conditioning evaporator coil
drain.
• Water heaters have an integrated
condensate trap. DO NOT install
an external condensate trap.
Neutralizer
Refer to neutralizer
Installation Manual
and local codes for
neutralizer installation
guidelines.
Pipe open to
atmosphere
Condensate
Pump
Pipe open to
atmosphere
Figure 54
Figure 55
Rinnai Tankless Water Heater Installation and Operation Manual 55
4.9.2 Instructions
To connect the condensate drain pipe:
1. Apply thread sealant to 1/2 in. MNPT
condensate drain port.
2. Thread 1/2 in. NPT fitting onto condensate
drain port.
3. Follow the steps in the next section:
“Condensate Pump Safety Switch Wiring.”
4.9.3 Condensate Pump
Safety Switch Wiring
The condensate pump (if installed) should be
wired to deactivate the water heater in the event
the condensate pump fails.
1. Disconnect power from the water heater.
2. Open the water heater cover and locate two
white wires labeled “To Condensate Pump
Safety Switch.”
1/2 in. MNPT
Condensate Drain
To Condensate Pump
Safety Switch
Strip insulation
off both ends
of wire
Cut off crimp
connectors
3. Cut crimp connectors off white wires and strip
the insulation off of the two ends.
4. Select an appropriate length of wire (18 AWG
or greater) and strip the insulation off the ends.
Follow the wiring guidelines established by the
National Electrical Code (NEC).
5. With wire nuts or other approved wire
connectors, connect the “To Condensate
Pump Safety Switch” wires to the normally
open contacts on the condensate pump (see
image below).
6. Reconnect power to the water heater and
press the “On/Off” button on the controller.
Test Operation
1. Test the operation of the shut off switch by
unplugging the condensate pump and filling
the condensate reservoir with water until the
float switch closes the circuit.
2. Turn on the water heater.
3. The water heater displays diagnostic code
“25.”
4. Plug in the condensate pump in and confirm
condensate is flowing out of the reservoir.
5. Turn off the water heater by pressing the “On/
Off” button on the controller. Wait five seconds
then turn the power back on. This will clear the
diagnostic code.
Figure 56
Figure 57
The steps in this section must conform with
local codes and the guidelines established by
the National Electrical Code (NEC).
IMPORTANT
Rinnai Tankless Water Heater Installation and Operation Manual 56
NC
NO
COM
To Condens
a
t
e
P
u
m
p
Safety Switc
h
Tankless Water Heater
To Condensate Pump
Safety Switch Wires
Wire Nut Connecting
Two Wires
Field-Supplied Wires
Safety Switch Wires*
Condensate Pump (Field-supplied)
Includes internal safety switch and power cord.
Power cord must be plugged into power source.
* Safety switch wires connect to the NO
and COM contacts on the safety switch.
• NO - Normally Open
• NC - Normally Closed
• COM - Common (Neutral)
Condensate Pump Safety Switch Installation
Figure 58: Condensate Pump Safety Switch Installation
Rinnai Tankless Water Heater Installation and Operation Manual 57
4.10 Connect the Gas Supply
Figure 59
• A trained and qualified professional must
install the gas supply.
• Turn off 120V power supply.
• Turn off the gas.
• Gas is flammable. Do not smoke or pro-
vide other ignition sources while working
with gas.
• Do not turn on the water heater or gas until
all fumes are gone.
4.10.1 Instructions
To connect the gas supply, follow the instructions
below:
1. Install a manual gas control valve in the gas
supply line to the water heater. A union can
be used on the connection above the shut off
valve for the future servicing or disconnection
of the water heater.
2. Check the type of gas and gas supply
pressure before connecting the water heater. If
the water heater is not of the gas type that the
building is supplied with, DO NOT connect the
water heater. Contact the dealer for the proper
water heater to match the gas type.
3. Check the gas supply pressure immediately
upstream at a location provided by the
gas company. Supplied gas pressure must
be within the limits shown in section “3.4
Specifications” with all gas appliances
operating.
4. Before placing the appliance in operation, all
joints including the heater must be checked
for gas tightness by means of soap, gas
leak detector solution, or an equivalent
nonflammable solution, as applicable. (Since
some leak test solutions, including soap and
water, may cause corrosion or stress cracking,
the piping shall be rinsed with water after
testing, unless it has been determined that the
leak test solution is non-corrosive.)
WARNING 5. Use approved connectors to connect the water
heater to the gas line. Purge the gas line of
any debris before connection to the water
heater.
6. Any compound used on the threaded joint of
the gas piping shall be a type that resists the
action of liquefied petroleum gas (propane/
LPG).
7. The gas supply line shall be gas tight, sized,
and so installed as to provide a supply of gas
sufficient to meet the maximum demand of the
heater and all other gas consuming appliances
at the location without loss of pressure. If in
doubt about the size of the gas line, refer
to the “Gas Pipe Sizing Reference Tables”
section on the next page.
8. Perform a leak and pressure test prior
to operating the water heater. If a leak is
detected, do not operate the water heater until
the leak is repaired.
Gas connection 3/4 in.
MNPT connection
Rinnai Tankless Water Heater Installation and Operation Manual 58
4.10.2 Gas Pipe Sizing Reference Tables
The gas supply must be capable of handling the entire gas
load required at the location. Gas line sizing is based on
gas type, the pressure drop in the system, the gas pressure
supplied, and gas line type. For gas pipe sizing, refer to
the National Fuel Gas Code, ANSI Z223.1/NFPA 54, or the
Natural Gas and Propane Installation Code, CSA B149.1
For some tables, you will need to determine the cubic
feet per hour of gas required by dividing the gas input by
the heating value of the gas (available from the local gas
company). The gas input needs to include all gas products
at the location and the maximum Btu usage at full load when
all gas products are in use.
Use the table for your gas type and pipe type to find the
pipe size required. The pipe size must be able to provide the
required cubic feet per hour of gas or the required Btu/hour.
The information below is provided as an example. The
appropriate table from the applicable code must be used.
Table 22: Gas Pipe Sizing Calculation
Worksheet
Instructions: Enter values in empty boxes.
Rinnai Model Gas Input:
Additional Appliance Total Gas Input:
Heating Value of Gas:
Cubic Feet Per Hour (CFH):
Answer:
A Btu/hr
B Btu/hr
C Btu/ft3
(CFH)=A + B
C
(CFH)=
(CFH)=ft3/hr
Natural Gas
Table 23: Pressure Drop 0.5 in. w.c.
Information in table
obtained from NFPA 54,
ANSI Z223.1 - 2015.
Nominal Pipe Size (in.)
1/2 3/4 1 1 1/4
Length in ft (meters)Capacity in Cubic Feet of Gas per Hour
10 (3)172 360 678 1,390
20 (6)118 247 466 957
30 (9)95 199 374 768
40 (12)81 170 320 657
50 (15)72 151 284 583
60 (18)65 137 257 528
70 (21)60 126 237 486
80 (24)56 117 220 452
90 (27)52 110 207 424
100 (30)50 104 195 400
Schedule 40 Metallic Pipe
Inlet Pressure:Less than 2 psi
Specific Gravity:0.60
Table 24: Example
Rinnai Model Gas Input:
Additional Appliance Total Gas Input:
Heating Value of Gas:
Cubic Feet Per Hour (CFH):
Answer:
For this example, the pipe diameter
must be at least 3/4 in. pipe size and
10 ft (3 m) in length.
A 199,000 Btu/hr
B 65,000 Btu/hr
C 1,000 Btu/ft3
(CFH)=
A + B
C
(CFH)=199,000+65,000
1,000
(CFH)=264 ft3/hr
Rinnai Tankless Water Heater Installation and Operation Manual 59
Table 25: Pressure Drop 3.0 in. w.c.
Intended use: Initial supply
pressure of 8.0 in. w.c.
or greater.
Information in table
obtained from NFPA 54,
ANSI Z223.1 - 2015.
Nominal Pipe Size (in.)
1/2 3/4 1 1 1/4
Length in ft (meters)Capacity in Cubic Feet of Gas per Hour
10 (3)454 949 1,790 3,670
20 (6)312 652 1,230 2,520
30 (9)250 524 986 2,030
40 (12)214 448 844 1,730
50 (15)190 397 748 1,540
60 (18)172 360 678 1,390
70 (21)158 331 624 1,280
80 (24)147 308 580 1,190
90 (27)138 289 544 1,120
100 (30)131 273 514 1,060
Natural Gas
Table 26: Example
Rinnai Model Gas Input:
Additional Appliance Total Gas Input:
Heating Value of Gas:
Cubic Feet Per Hour (CFH):
Answer:
For this example, the pipe diameter
must be at least 1/2 in. pipe size and
20 ft (6 m) in length.
A 199,000 Btu/hr
B 65,000 Btu/hr
C 1,000 Btu/ft3
(CFH)=
A + B
C
(CFH)=199,000+65,000
1,000
(CFH)=264 ft3/hr
Schedule 40 Metallic Pipe
Inlet Pressure:Less than 2 psi
Specific Gravity:0.60
Propane (Undiluted)
Table 27: Pressure Drop 0.5 in. w.c.
Information in table obtained from
NFPA 54, ANSI Z223.1 - 2015.
Nominal Pipe Size (in.)
1/2 3/4 1 1 1/4
Length in ft (meters)Capacity in Thousands of Btu per Hour
10 (3)291 608 1,150 2,350
20 (6)200 418 787 1,620
30 (9)160 336 632 1,300
40 (12)137 287 541 1,110
50 (15)122 255 480 985
60 (18)110 231 434 892
80 (24)101 212 400 821
100 (30)94 197 372 763
Schedule 40 Metallic Pipe
Inlet Pressure:11 in w.c.
Specific Gravity:1.50
Table 28: Example
Rinnai Model Gas Input:
Additional Appliance Total Gas Input:
Total Gas Input:
Answer:
For this example, the pipe diameter
must be at least 1/2 in. nominal pipe
size and 10 ft (3 m) in length.
A 199,000 Btu/hr
B 65,000 Btu/hr
Total Gas
Input =264,000 Btu/hr
Total Gas
Input =A + B
Total Gas
Input =199,000 + 65,000
Rinnai Tankless Water Heater Installation and Operation Manual 60
4.11 Connect the Power Supply
• Do not use an extension cord or adapter plug with this appliance.
• The water heater must be electrically grounded in accordance with local codes and ordinances or,
in the absence of local codes, in accordance with the National Electrical Code, ANSI/NFPA No.
70.
• Indoor water heaters are equipped with a three-prong (grounding) plug for your protection against
shock hazard and should be plugged directly into a properly grounded three-prong receptacle. Do
not cut or remove the grounding terminal from this plug.
4.11.1 Guidelines
When connecting the power supply, follow these guidelines:
• Do not rely on the gas or water piping to ground the water heater. Ground locations are provided
inside the water heater.
• The water heater requires 120 VAC, 60 Hz power from a properly grounded circuit.
• If using the 5 ft (1.5 m) power cord (supplied with internal/indoor water heaters), plug it into a
standard 3 prong 120 VAC, 60 Hz properly grounded wall outlet.
• On external (outdoor) models, a disconnect switch must be provided and installed for the in-
coming 120 VAC power. The switch should be a type that is suitable for outdoor use. Check the
National Electrical Code, ANSI/NFPA 70 and your local codes for a proper switch type to use in
your area. Power connections must be protected from the weather and flexible cords must use an
appropriate strain relief.
• The wiring diagram is located on the inside of the water heater front cover.
WARNING
120V Wiring
• White wire (Neutral)
• Black wire (Hot leg)
□Confirm that the electricity is supplied from 120 VAC, 60 Hz power source and is in a properly
grounded circuit.
□Confirm that an extension cord or an adapter plug has NOT been used with the water heater.
Post-Power Supply Connection Checklist
Ground connection
screw
Disconnect switch (required on external outdoor models)Figure 60
Rinnai Tankless Water Heater Installation and Operation Manual 61
4.12 Configure Parameter Settings
4.12.1 Instructions
DO NOT adjust parameter settings unless specifically instructed to do so.
Certain elements of the installation may require adjusting the parameters of the tankless water heater.
To adjust the parameters:
1. Locate the PC Board (lower right side of unit).
2. Locate the two push buttons (A and B) on the PC Board.
3. Press the “A” button for 1 second.
WARNING
A
B
4. Use the ▲ (Up) and ▼ (Down) buttons on the controller to select a
setting number (see Parameter Settings Table below).
5. Once the desired setting number is selected, use
the “On/Off” button on the controller to change
the selection for the setting number.
Example: Display will change from 01A to 01b
for Maximum Temperature setting (as shown
below).
6. To exit the parameters, press the “A” button for 1
second.
01A 01B
Figure 61
Figure 62
Figure 63
Rinnai Tankless Water Heater Installation and Operation Manual 62
SETTING
#
SETTING
DESCRIPTION
SELECTION
a b c d
01 Maximum Set
Temperature 120°F 140°F
02
High Altitude
Installation Location
0 - 2,000 ft
(0 - 610 m)
2 , 0 0 1 - 5 , 4 0 0 f t
(610 - 1,585 m)
5,401 - 7,700 ft
(1,585 - 2,347 m)
7,701 - 10,200 ft
(2,347 - 3,109 m)
03 Service Soon1 Disabled 0.5 Year 1 Year 2 Years
04 Recirculation
Settings
No
Recirculation
Recirculation
(Dedicated)
05 Recirculation Mode2 Economy Comfort Commercial5
06 Control Switch BMS3 Air Handler (AH)
07 Units in Standby
(EZConnect™)2 1
10 Gas Type
(Factory Set)NG LPG
11 Maximum Flow
Rate4 Standard High
12 Water Heater Model
(Factory set values
and not adjustable)
Without Pump With Pump
13 199 (3237)180 (2934)160 (2530)130 (2024)
14 Internal
(Indoor)
External
(Outdoor)
Default is A for all settings below except 10, 12, 13, and 14 which are factory set.
1 See section “4.12.2 Service Indicator (Service Soon, 55)” for more information.
2 Setting 05 is available only if setting 04b is selected.
Economy mode cycles the pump less often, using less energy to maintain the circulation loop temperature.
Comfort mode cycles the pump more frequently, ensuring the loop temperature remains higher (but also uses more
energy).
3 BMS = Building Management System
4 Selecting “High” will increase the water flow rate to the maximum capacity.
5 Commercial mode should not be used for residential applications. Application of commercial mode may result in
excessive machine wear and energy consumption.
4.12.2 Service Indicator (Service Soon, SS)
5 TIMES
55
This water heater includes a service indicator (Service Soon,
SS). When selected in the parameter settings, an SS code will
display on the controller indicating that it is time to flush and
service the water heater.
• Selection is installers preference based on water
conditions or other factors that may influence the
suggested interval of service.
• See the “Parameter Settings” section of this manual
for selectable service intervals.
• If Service Soon (SS) appears on the controller dis-
play, contact your local service provider to flush and
service the water heater (see 6.3 Flushing the Heat
Exchanger)
• Service Soon will appear again based on the select-
ed service interval.
To reset Service Soon (55)
Press the ON/OFF button 5 times
NOTE: Service Soon (55) will display
on the controller again when the water
heater reaches the interval selected in
the parameter settings.
Figure 64
Table 29: Parameter Settings Table
Rinnai Tankless Water Heater Installation and Operation Manual 63
4.13 External Pump with Circ-Logic
Rinnai SENSEI™ Tankless Water Heaters include Circ-Logic technology that offers the comfort and
convenience of instant hot water with the use of an external recirculation pump. Circ-Logic controls the
on/off sequence and operation cycles of the external recirculation pump through the programming of the
tankless water heater’s parameter settings. With residential units, the external pump cable is not included
with the tankless water heater and must be purchased separately. Circ-Logic operates in either Economy
or Comfort mode based on the parameter settings of the water heater.
• Economy Mode—Cycles the pump less often, using less energy to maintain the circulation loop
temperature.
• Comfort Mode—Cycles the pump more frequently, ensuring the loop temperature remains higher
(but also uses more energy).
Rinnai Set Temperature
140 135 130 125 120 115 110 108 106 104 102 100 98
Typical Pump OFF Intervals (Minutes)
Economy 18 20 22 24 28 32 38 40 44 48 52 56 62
Comfort 9 10 11 12 14 16 19 20 22 24 26 28 31
Figure 65
Table 30
Rinnai Tankless Water Heater Installation and Operation Manual 64
4.14 Post-Water Heater Installation Checklist
Complete the following checklist when water heater installation is complete. You should be able to
answer YES to each question. If you answer NO to any question, installation is not complete. Refer to the
applicable section in the Rinnai Tankless Water Heater Installation and Operation Manual for additional
information.
For assistance, contact your local dealer or distributor, or call Rinnai Customer Care at 1-800-621-9419.
INSTALLATION LOCATION YES NO
Have you verified the unit, vent and air intakes meet the clearance requirements?□□
COMBUSTION AIR & VENTING YES NO
Have all corrosive compounds been removed from around the combustion air inlet of the
tankless water heater?□□
Have you followed the combustion air requirements to provide sufficient combustion air for
the tankless water heater?□□
Are the correct venting products for the installed model being utilized?□□
Have you installed the vent screen(s) for PVC vent applications?□□
Have you verified the vent system does not exceed maximum length?□□
PLUMBING YES NO
Have the water lines been purged of all debris and the filter cleaned? □□
Have you verified the hot and cold water lines to the tankless water heater are not
interchanged?□□
Does the water supply to the heater have adequate pressure? Is it free of chemicals? Did
you verify it does not exceed total hardness that will damage the heat exchanger?□□
Have you verified that no toxic chemicals were introduced to the potable water?□□
Did you drain the tankless water heater if not intended to be used immediately?□□
Have water quality issues (if any) been addressed?□□
Have you performed the leak and pressure test for the tankless water heater and
plumbing system?□□
ISOLATION VALVES YES NO
Are the isolation valves (included with the tankless water heater) installed?□□
PRESSURE RELIEF VALVE (PRV)
Does the PRV comply with the standard for Relief Valves and Automatic Gas Shutoff
Devices for Hot Water Supply Systems ANSI Z21.22, and/or the standard Temperature,
Pressure, Temperature and Pressure Relief Valves and Vacuum Relief Valves, CAN1-4.4?□□
Did you verify the PRV is rated up to 150 psi and (at least) the maximum Btu/hr of the
tankless water heater?□□
Is the discharge from the PRV piped to the ground or into a drain system as per local
codes?□□
4
3
2
1
5
Rinnai Tankless Water Heater Installation and Operation Manual 65
Is the discharge line from the PRV pitched downward and does it terminate 6 in. (152 mm)
above the drain?□□
Is the discharge end of the line plain (unthreaded) and a minimum of 3/4 in. diameter? □□
Is the discharge line material suitable for at least 180°F water?□□
Did you take measures to protect the PRV and PRV discharge line from freezing?□□
Have you verified the PRV is not plumbed with the condensate drain line? □□
Have you verified the PRV is not plugged and that reducing fittings, valves, or other
restrictions are not installed in the relief line?□□
CONDENSATE DRAIN YES NO
If the condensate pump is installed, is it wired to deactivate the tankless water heater in
the event of failure? For more information, refer to the “Condensate Pump Safety Switch
Wiring” section of the manual.
□□
Did you verify the condensate drain pipe is as short as possible and has a downward
pitch toward the drain or condensate pump?□□
Is all condensate drained and disposed of as per local codes?□□
Did you use ONLY corrosion resistant materials for the condensate drain lines?□□
Did you verify the condensate drain pipe along its entire length is at least the same
diameter as the drain line (1/2 in. NPT)?□□
Did you check to ensure the condensation drain lines are protected from freezing? □□
If a floor pump is not available or the drain is above the level of the condensate drain, did
you install a condensate pump?□□
Have you verified the condensate drain line is not plumbed with the pressure relief valve?□□
Have you confirmed the condensate drain line is not connected with an air conditioning
evaporator coil drain? □□
Have you verified an external condensate trap is not installed? (This tankless water heater
has an integrated condensate trap.) □□
Have you confirmed the end of the condensate drain pipe is open to atmosphere?□□
GAS SUPPLY YES NO
Did you verify the gas system is appropriately sized?□□
Did you verify the water heater is rated for the gas type supplied?□□
Have you performed a gas line and connection leak test?□□
Did you install a manual gas control valve in the gas line to the water heater?□□
Is the inlet gas pressure within limits?□□
Did you purge the gas line of any debris before connecting the water heater?□□
7
6
AVERTISSEMENT
WARNING
Rinnai Tankless Water Heater Installation and Operation Manual 66
5. 5. OperationOperation
Topics in this section
• Safety Precautions
• Start-up Information
• Control Panel
• Basic Operation Settings
• Diagnostic Codes
5.1 Safety
Precautions
If the information in these instructions is
not followed exactly, a fire or explosion may
result causing property damage, personal
injury, or death.
• Do not store or use gasoline or other flam-
mable vapors and liquids in the vicinity of
this or any other appliance.
• Before operating, smell all around the ap-
pliance area for gas. Be sure to smell next
to the floor because some gas is heavier
than air and will settle on the floor.
• WHAT TO DO IF YOU SMELL GAS
–Do not try to light any appliance.
–Do not touch any electrical switch; do
not use any phone in your building.
–Immediately call your gas supplier from
a neighbor’s phone. Follow the gas
supplier’s instructions.
–If you cannot reach your gas supplier,
call the fire department.
• Installation and service must be performed
by a trained and qualified professional,
service agency or the gas supplier.
Assurez-vous de bien suivre les instructions
données dans cette notice pour réduire au
minimum le risque d’incendie ou d’explosion
ou pour éviter tout dommage matériel, toute
blessure ou la mort.
• Ne pas entreposer ni utiliser d’essence ou
ni d’autres vapeurs ou liquides inflamma-
bles à proximité de cet appareil ou de tout
autre appareil.
• Avant d’opérer, sentir le gaz autour de la
zone de l’appareil. Assurez-vous de sentir
à côté du sol car certains gaz sont plus
lourds que l’air et se déposeront sur le sol.
• QUE FAIRE SI VOUS SENTEZ UNE
ODEUR DE GAZ :
–Ne pas tenter d’allumer d’appareil.
–Ne touchez à aucun interrupteur ; ne
pas vous servir des téléphones se trou-
vant dans le bâtiment.
–Appelez immédiatement votre fournis-
seur de gaz depuis un voisin. Suivez
les instructions du fournisseur.
–Si vous ne pouvez rejoindre le fournis-
seur, appelez le service des incendies.
• L’installation et l’entretien doivent être
assurés par un installateur ou un service
d’entretien qualifié ou par le fournisseur de
gaz.
Rinnai Tankless Water Heater Installation and Operation Manual 67
• Keep the area around the appliance clear
and free from combustible materials,
gasoline, and other flammable vapors and
liquids.
• Do not use this appliance if any part
has been under water. Immediately call
a trained and qualified professional to
inspect the appliance and to replace any
part of the control system and any gas
control which has been under water.
(N’utilisez pas cet appareil s’il a été plongé
dans l’eau, même partiellement. Faites
inspecter l’appareil par un licence pro-
fessionnelle et remplacez toute partie du
système de contrôle et toute commande
qui ont été plongés dans l’eau.)
• Should overheating occur or the gas sup-
ply fail to shut off, turn off the manual gas
control valve to the appliance.
(En cas de surchauffe ou si l’alimentation
en gaz ne s’arrête pas, fermez manuelle-
ment le robinet d’arrêt de l’admission de
gaz.)
• Use only your hand to push in or turn
the gas control knob. Never use tools. If
the knob will not push in or turn by hand,
do not try to repair it, call a trained and
qualified professional. Force or attempted
repair may result in a fire or explosion.
• This appliance does not have a pilot. It
is equipped with an ignition device which
automatically lights the burner. DO NOT
try to light the burner by hand.
• Do not use an extension cord or an adapt-
er plug with this appliance.
• Any alteration to the appliance or its con-
trols can be dangerous and will void the
warranty.
• If you install this water heater in an area
that is known to have hard water or that
causes scale build-up the water must
be treated and/or the heat exchanger
flushed regularly. Rinnai provides a “Scale
Control System” that offers superior lime
scale prevention and corrosion control by
feeding a blend of control compounds into
the water supply. Damage and repair due
to corrosive compounds in the air is not
covered by warranty.
• Keep the combustion air vent pipe loca-
tion free of chemicals, such as chlorine or
bleach, that produce fumes. These fumes
can damage components and reduce the
life of your appliance. Damage and repair
due to scale in the heat exchanger is not
covered by warranty.
• Always check the water temperature be-
fore entering a shower or bath.
• Do not adjust the parameter settings un-
less specifically instructed to do so.
Rinnai Tankless Water Heater Installation and Operation Manual 68
5.2 Operating Instructions
FOR YOUR SAFETY READ BEFORE OPERATING
If you do not follow these instructions exactly, a fire or explosion
may result causing property damage, personal injury or loss of life.
OPERATING INSTRUCTIONS
1. STOP! Read the safety information above.
2. Set the temperature controller to lowest setting.
3. Turn off all electric power to the appliance.
4. This appliance does not have a pilot. It
is equipped with an ignition device which
automatically lights the burner. Do not try to
light the burner by hand.
5. Turn the manual gas control valve located at
gas inlet of appliance clockwise to the OFF
position.
6. Wait five (5) minutes to clear out any gas.
Then smell for gas, including near the floor. If
you smell gas, STOP! Follow “B” in the safety
information above. If you don’t smell gas, go to
the next step.
7. Turn the manual gas valve located at gas inlet
of appliance counterclockwise to the full ON
position.
8. Turn on all electric power to the appliance.
9. Set the temperature controller to desired
setting.
10. If the appliance will not operate, follow the
instructions “To Turn Off Gas To Appliance” and
call your service technician or gas supplier.
TURN OFF GAS TO APPLIANCE
1. Set the temperature controller to lowest setting.
2. Turn off all electric power to the appliance if
service is to be performed.
3. Turn the manual gas control valve located at
gas inlet of appliance clockwise to the OFF
position.
WARNING
A. This appliance does not have a pilot. It is
equipped with an ignition device which automat-
ically lights the burner. Do not try to light the
burner by hand.
B. BEFORE OPERATING, smell all around the
appliance area for gas. Be sure to smell next to
the floor because some gas is heavier than air
and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not use
any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call
the fire department.
C. Use only your hand to push in or turn the gas
control valve. Never use tools. If the gas
control valve will not turn by hand, do not try
to repair it, call a qualified service technician.
Force or attempted repair may result in a fire or
explosion.
D. Do not use this appliance if any part has been
under water. Immediately call a qualified ser-
vice technician to inspect the appliance and to
replace any part of the control system and any
gas control which has been under water.
Figure 67
Figure 68
Rinnai Tankless Water Heater Installation and Operation Manual 69
Display
Increases hot water temperature
Decreases hot water temperature
Indicates the water heater is in use
Enables controller when multiple
controllers are used
Turns the water heater on or off
5.3 Control Panel
The controller panel allows you to adjust the
water temperature, lock the controller on a set
temperature, and view diagnostic information.
5.3.1 Setting the Controller to
Mute
To eliminate the beeps when keys are pressed,
press and hold both the (Up) and (Down)
buttons at the same time until a beep is heard
(approximately 3 seconds). Then, release both
buttons.
To turn on the beeps, repeat the above steps.
5.3.2 Locking the Controller
1. To lock the internal controller, press and hold
down the “Priority” button.
2. While holding down the “Priority” button,
press the (Up) button until a beep is heard
(approximately 5 seconds). Then, release
both buttons at the same time.
3. appears in the display indicating the
controller is locked.
To unlock the controller, follow the above steps.
The display flashes between and the set
temperature to indicate the controller is locked.
NOTE
Figure 66
Table 31
Figure 69
Rinnai Tankless Water Heater Installation and Operation Manual 70
5.4 Setting the
Temperature
This water heater requires a minimum flow
rate to operate. This rate can be found on the
specification page in this manual. In some cases
when you are not getting hot water or if the water
alternates between hot and cold, it is due to the
water flow being below or close to the minimum
flow rate. Increasing the flow rate should resolve
these problems in these cases.
If you are experiencing issues with higher
temperature settings, then reduce the
temperature setting. Selecting a temperature
closer to that which is actually used at the faucet
will increase the amount of hot water being
delivered to the faucet, due to less cold water
mixing at the fixture.
Water temperatures over 125°F (52°C) can
cause severe burns or scalding resulting in
death.
Hot water can cause first degree burns with
exposure for as little as:
• 3 seconds at 140°F (60°C)
• 20 seconds at 130°F (54°C)
• 8 minutes at 120°F (49°C)
Children, disabled, or elderly are at highest risk
of being scalded.
Feel water before bathing or showering.
The controller buttons shown below are located
on the outside front panel for internal (indoor)
water heaters.
For external (outdoor) water heaters, open the
front panel to access the controller buttons.
1. If the water heater is off, press the “On/Off”
button to turn on.
2. The “Priority” button enables a controller if
multiple controllers are being used. If the
“Priority” light is off, then press the “Priority”
button on the temperature controller. The
orange “Priority” light will glow indicating that
this controller is controlling the temperature
and that the water heater is ready to supply
hot water. The priority can only be changed
while no hot water is running.
3. Press the (Up) or (Down) buttons to
obtain the desired temperature setting.
All hot water sources are able to provide
water at this temperature setting until it is
changed again at this or another temperature
controller.
DANGER
• While any hot water is being provided, the
temperature setting can only be adjusted
between 98°F and 110°F.
• Check local codes for the maximum water
temperature setting allowed when used in
nursing homes, schools, day care cen-
ters, and all other public applications.
• If a newly installed water heater with a
controller has not been powered for at
least 6 hours then the temperature will re-
turn to the default setting of 104°F (40°C)
if power is interrupted.
• There may be a variation between the
temperature displayed on the temperature
controller and the temperature at the tap
due to weather conditions or the length of
pipe to the water heater.
IMPORTANT
Temperature Settings
Fahrenheit (°F)98 100 102 104 106 108 110 115 120 125*130*135*140*150**160**185**
Celsius (°C)37 38 39 40 41 42 43 46 49 52 54 57 60 66 71 85
Figure 70
Figure 71
Figure 72
Rinnai Tankless Water Heater Installation and Operation Manual 71
5.4.1 Available Temperatures with an Internal Controller
The water heater can deliver water at only one temperature setting at a time. The available temperatures
are provided below. A temperature lower than 98°F (37°C) can be obtained at the tap by mixing with cold
water.
To change the temperature scale from Celsius to Fahrenheit or vice versa, press and hold the “On/Off”
button on the controller for 5 seconds while the water heater is OFF.
* These models have a default maximum temperature of 120°F (49°C) and an option to increase the maximum
temperature to 140°F (60°C). Refer to section “4.1.12 Parameter settings” for further details.
** These settings require the installation of the MCC-91-2 controller. When the MCC-91-2 controller is connected, these
higher temperatures are available on all controller models in the system. Use of an MCC-91-2 controller in a residential
dwelling will reduce the warranty coverage to that of a commercial warranty application.
5.5 Performance Data
To obtain performance data:
1. Press and hold the (Down) button.
2. While holding the (Down) button for 2 seconds, press and hold
the “On/Off” button (hold both buttons simultaneously).
3. Use the (Up) and (Down) buttons to scroll to the desired
information described in the Performance Data Table.
4. To exit performance data, repeat step 2 above.
5. When complete, the set temperature appears in the display.
Table 32
Rinnai Tankless Water Heater Installation and Operation Manual 72
#Data Unit
01 Water Flow Rate x0.1 gal/min
02 Outgoing Temperature °F
03 Combustion Hours x100 Hours
04 Combustion Cycles *
05 Fan Frequency Hz
06 Additional Controllers Connected *
07 Water Flow Control Position 0=Mid 1=Open
2=Closed
08 Inlet Temperature °F
09 Fan Current x10 mA
10 Total Bath Fill Amount Gallons
11 HEX Outlet Temp.°F
12 By-Pass Flow Control Position Degrees of opening
15 Freeze Protection Temperature
(Indoor Units Only)
°F
17 Freeze Protection Temperature
(Outdoor Units Only)
°F
19 Pump Hours x100 Hours
20 Pump Cycles *
21 Exhaust Temperature °F
* Refer to the Technical Data Sheet located on the inside front cover of the water heater for additional information.
Table 33: Performance Data Table
WARNING
Figure 72
Rinnai Tankless Water Heater Installation and Operation Manual 73
5.6 Diagnostic Codes
To display diagnostic codes:
Turn off the water heater by pressing the “On/Off” button.
Press and hold the “On/Off” for 2 seconds and then the (Up) button simultaneously.
The last nine maintenance codes display and flash one after the other.
To exit diagnostic codes and return the water heater to normal operation, press and hold the “On/Off” button for 2 seconds and then the (Up) button simultaneously.
Turn on the water heater by pressing the “On/Off” button.
Some of the checks below should be performed by a trained and qualified
professional. Consumers should never attempt any action that they are not
qualified to perform.
03 Power interruption during bath fill
(Water will not flow when power returns)
• Turn off all hot water taps. Press ON/
OFF twice.
05 By-Pass Flow Control
• Measure resistance values of the by-
pass flow control.*
• Replace By-Pass flow control device.
10 Air Supply or Exhaust Blockage/
Condensate Trap is Full
• Ensure condensate line is not blocked.
• Ensure internal air filter is clean with
no obstructions. (Indoor Water Heaters
Only)
• Ensure High Altitude setting. (See
Parameter Settings)
• Ensure Combustion air and Exhaust
vents are not blocked and approved
venting materials are being used.
(Indoor Water Heaters Only)
• Ensure vent length is within limits.
(Indoor Water Heaters Only)
• Check fan for debris and ensure wheel
turns freely.
• Verify check valve is not stuck between
fan casing and burner body.
11 No Ignition (Heater Not Turning On)
• Check that the gas is turned on at the water heater, meter, or cylinder.
• If the system is propane, make sure that gas is in the tank.
• Ensure gas type and inlet gas pressure are correct.
• Bleed all air from gas lines.
• Check the ground wire for the PC Board.
• Ensure flame rod wire is connected.
• Ensure igniter is operational.*
• Check gas solenoid valves for open or short circuits.*
• Verify gas orifice is correct.
12 No Flame
• Check that the gas is turned on at the water heater, gas meter, or cylinder.
• If the system is propane, make sure that gas is in the tank.
• Ensure flame rod wire is connected.
• Ensure gas type and inlet gas pressure is correct.
• Bleed all air from gas lines.
14 Heat Exchanger Overheat
• Measure resistance of Overheat Switch.*• Check heat exchanger surface for hot spots which indicate blockage due to scale build-up. • Refer to instructions in manual for flushing heat exchanger. Hard water must be treated to prevent scale build up or damage to the heat exchanger.• Ensure it is not in forced Hi setting.
* See “Electrical Diagnostics” on Technical Data
Sheet located on inside front cover of water heater.
Rinnai Tankless Water Heater Installation and Operation Manual 74
* See “Electrical Diagnostics” on Technical Data
Sheet located on inside front cover of water heater.
15 Venturi Control
• Ensure the Venturi motor is operating correctly.*
• Replace gas valve assembly.
• Clear diagnostic code by resetting the main power supply to the water heater.
16 High Outgoing Temperature
(safety shutdown because water heater is too hot)• Confirm fan motor is functioning correctly.
• Replace the gas valve assembly.
17 Venturi Blockage
• First, follow the recommended solutions for Diagnostic Code 10.
• If the Code 10 solutions do not correct the problem, ensure the Venturi is not blocked.
• Please call Rinnai technical department.
19 Electrical Grounding
• Check all components for electrical
short.
21 Data Transfer Error
• If the PCB has been replaced, ensure
the data transfer process has been
completed.
25 Condensate Pump (Accessory)
• Confirm wire connections and harness
are good.
• Ensure condensate reservoir is empty
and condensate pump is operating.
32 Outgoing Thermistor
• Check sensor wiring for damage.
• Measure resistance of sensor.*
• Clean sensor of scale build-up.
• Replace sensor.
33 Heat Exchanger Thermistor
• Follow the steps above for Code 32 for
troubleshooting.
38 Exhaust Thermistor
• Check sensor wiring for damage.
• Measure resistance of sensor.*
• Replace sensor.
41 Freeze Protection Thermistor
• Follow the steps above for Code 38 for
troubleshooting.
51 Inlet Thermistor
• Check sensor wiring for damage.
• Measure resistance of sensor.*
• Clean sensor of scale build-up.
• Replace sensor.
52 Gas Valve
• Check flame rod and wire for damage.
• Check gas solenoid valve for open or short circuit.*
• Replace gas valve assembly.
• Please call Rinnai technical department
54 High Exhaust Gas Temperature
• Ensure Heat Exchanger fins are clean and not blocked.
• Confirm inlet water temperature is not too high.
• Clear diagnostic code by resetting the main power supply to the water heater.
61 Combustion Fan
• Check the motor wire harness for loose or damaged connections.
• Measure resistance of motor wire harness.*
• Ensure the combustion fan spins freely.
63 Recirculation Low Flow
• Ensure bypass plug is removed and bypass filter is installed. (COV Mode)
• Ensure both the inlet water filter and bypass filter are clean and free of debris.
• Ensure Parameter setting are correctly set for recirculation mode.
• Ensure Pump supply voltage.
• Ensure air is removed from the recirculation line.
65 Water Flow Control
• Measure resistance values of the water flow control.*
• The water flow control valve has failed to close during the bath fill function. Immediately turn off the water and discontinue the bath fill function. Contact a trained and qualified professional to service the appliance.
70 PC Board
• Replace PC Board
Rinnai Tankless Water Heater Installation and Operation Manual 75
71 Solenoid Valve Circuit
• Ensure dip switch on PC board is in the OFF position.
• Ensure gas control wire is not loose or damaged.
• Ensure heater circuit is not grounded.
• Replace PC Board.
72 Flame Rod
• Check flame rod and wire for damage.
• Verify HEX is not leaking.
FF Maintenance Indicator
• Placeholder in Diagnostic code history
indicating that a service provider
performed maintenance or service.
• Enter this code after performing
service by pressing (Up) ,
(Down) and On/Off simultaneously.
• FF is visible on the monitor.
SS (SS) Service Soon (Flush Heat
Exchanger)
• SS is a time-based service indicator set
during installation. See section “4.12.1
Parameter Settings” for additional
details on setting and changing the SS
indicator.
• SS indicates that it is time for service.
The heat exchanger should be flushed
to prevent damage (refer to section
“6.3 Flushing the Heat Exchanger” for
more information). Hard water must
be treated to prevent scale build-up
or damage to the heat exchanger.
• To reset the SS code, push the On/Off
button on the temperature controller 5
times in 5 seconds.
* See “Electrical Diagnostics” on Technical Data
Sheet located on inside front cover of water heater.
FF
NO CODE - Nothing happens when
water flow is activated
• Verify you have at least the minimum
flow rate required to fire unit.
• Measure the resistance of the water
flow control sensor.*
• Clean inlet water supply filter.
• On new installations ensure hot and
cold water lines are not reversed.
Visit www.rinnai-lms.com for additional
troubleshooting resources.
Rinnai Tankless Water Heater Installation and Operation Manual 76
6. 6. MaintenanceMaintenance
Topics in this section
• Maintenance
• Cleaning and Inspecting the Air Filter
(Indoor Units Only)
• Flushing the Heat Exchanger
• Draining the Water Heater
6.1 Maintenance
This water heater must be inspected annually by
a trained and qualified professional. Repairs and
maintenance shall be performed by a trained and
qualified professional. The trained and qualified
professional must verify proper operation after
servicing.
To protect yourself from harm, before performing
maintenance:
• Turn off the electrical power supply by un-
plugging the power cord or by turning off
the electricity at the circuit breaker. (The
temperature controller does not control the
electrical power.)
• Turn off the gas at the manual gas control
valve, usually located immediately below
the water heater.
• Turn off the incoming water supply. This
can be done at the isolation valve immedi-
ately below the water heater or by turning
off the water supply to the building.
Keep the appliance area clear and free
from combustible materials, gasoline, and
other flammable vapors and liquids.
The following maintenance items are required for
the proper operation of your water heater.
CLEANING
It is imperative that control compartments, burners,
condensate collection and disposal system, vent
screens and circulating air passageways of the
appliance be kept clean.
BURNER
Check burner flame for proper color. Once ignited,
the flame must cover the surface of the burner.
The flame must burn with a clear, blue, stable
flame. If the flame does not have this appearance,
complete the following steps:
1. Turn off and disconnect electrical power. Allow
to cool.
2. Remove the front panel by removing four
screws.
3. Use a vacuum to remove dust from the main
burner and fan blades. Do not use a wet cloth
or spray cleaners on the burner. Do not use
volatile substances such as benzene and
thinners; they may ignite or fade the paint.
4. Use soft dry cloth to wipe cabinet.
CONDENSATE COLLECTION AND
DISPOSAL SYSTEM
Periodic inspection and cleaning of the
condensate collection and disposal system.
Ensure condensate is flowing and the end of the
drain is open to the atmosphere.
VENT SYSTEM
Periodic cleaning and inspection of the vent
system including screens in the vent termination.
The vent system should be inspected for
blockages including snow or other debris or
damage. If the vent is blocked and cannot be
easily cleared, contact a trained and qualified
professional.
MOTORS
Motors are permanently lubricated and do not
need periodic lubrication. However you must keep
fan and motor free of dust and dirt by cleaning
annually.
WARNING
WARNING
Testing the pressure relief valve should only
be performed by a trained and qualified
professional. Water discharged from the
pressure relief valve could cause severe burns
instantly or death from scalds.
WARNING
FRONT VIEW
Flame Rod
Blue Flame
SATISFACTORY
Figure 73
Rinnai Tankless Water Heater Installation and Operation Manual 77
TEMPERATURE CONTROLLER
Use a soft damp cloth to clean the temperature
controller. Do not use solvents.
LIME/SCALE BUILD-UP
Scale build-up is caused by hard water and can
be accelerated if the water heater is set at a high
temperature. Refer to section “6.3 Flushing the
Heat Exchanger” for more information. Refer to
section “Water Quality Guidelines” to determine
if your water needs to be treated or conditioned.
The water must be potable, free of corrosive
chemicals, sand, dirt, or other contaminates. It is
up to the installer to ensure the water does not
contain corrosive chemicals, or elements that
can affect or damage the heat exchanger. Water
that contains chemicals exceeding the levels
required affect and damage the heat exchanger.
Replacement of the heat exchanger due to water
quality damage is not covered by the warranty.
SNOW ACCUMULATION
Keep the area around flue terminal free of snow
and ice. The water heater will not function properly
if the combustion air or exhaust vent pipes
are impeded (blocked or partially blocked) by
obstructions.
Keep the condensate drain line free of snow and
ice. Ensure the line is not blocked or clogged and
that condensate is flowing freely.
COASTAL INSTALLATIONS
Installations located in or near coastal areas may
require additional maintenance due to corrosive
airborne ocean salt. If corrosion is observed on the
body of the water heater, the water heater shall
be inspected to ensure proper operation and if
necessary, repaired or replaced.
FILTERS
• Water Filter — Clean the inlet water filter by
closing the cold and hot water inlet isolation
(shut-off)t valves. Put a bucket under the filter
at the bottom of the water heater to catch
any water that is contained inside the unit.
Unscrew the water filter. Rinse the filter to
remove any debris. Install the filter and open
the isolation valves.
• Air Filter — See section “6.2 Cleaning and
Inspecting the Air Filter” for more information.
PRESSURE RELIEF VALVE
Operate the pressure relief valve manually once
a year. In doing so, it will be necessary to take
precautions with regard to the discharge of
potentially scalding hot water under pressure.
Ensure discharge has a safe place to flow.
Contact with your body or other property may
cause damage or harm.
VISUAL INSPECTION OF FLAME
Verify proper operation after servicing. The burner
must flame evenly over the entire surface when
operating correctly. The flame must burn with a
clear, blue, stable flame. See the parts breakdown
of the burner for the location of the view ports.
The flame pattern should be as shown in the
images below:
UNSATISFACTORY
FRONT VIEW
Flame Rod
Yellow Flame
Figure 74
Rinnai Tankless Water Heater Installation and Operation Manual 78
FREEZE PROTECTION
Make sure in case of freezing weather that the
water heater and its water lines are adequately
protected to prevent freezing. Damage due to
freezing is not covered by the warranty. Refer
to the “Freeze Protection” section (Section
4.2 Choose an Installation Location > Freeze
Protection). The water heater may be drained
manually. However, it is highly recommended that
drain down solenoid valves be purchased and
installed, which will automatically drain the water
heater if power is lost. (The condensate trap drain
plug and Pressure Relief Valve are not affected by
the auto drain down solenoid valves and will have
to be manually opened.)
WINTERIZATION
The following recommendations are intended to
suggest practices that are effective for winterizing
the water heater. They should be used as a
guide only. No liability is assumed for any issues
resulting from the use of this information.
Note: See section “6.4 Draining the Water Heater”
for detailed instructions on:
• Draining the water heater
• Running a low volume of water through the
water heater to prevent freezing
• Steps to take when the water heater or
external pipes have frozen
Gas
Shut off the gas to the water heater. It is generally
preferable to shut off the gas service to the entire
location if gas is not going to be used.
Water
• Shut off the cold water supply to the water
heater. It is generally preferable to shut off
the water to the entire location if water is
not going to be used.
• Drain the water heater by opening the
drain valves on the cold water line and hot
water line.
• Open several hot water taps and remove
the filter assembly at the water inlet in
order to allow room for expansion in case
there is water in the lines that freeze.
Condensate
Drain the condensate using the condensate drain
port on the bottom of the water heater.
Electric
Disconnect the power supply by either unplugging
the electrical cord or by turning off the circuit
breaker to the water heater to prevent potential
damage from irregular power surges or
interruptions.
6.2 Cleaning and
Inspecting the Air
Filter (Indoor Units
Only)
INSPECTION
• To maintain optimum performance,
periodically inspect the air filter.
• If the air filter appears to have lint and/or
dust build up, follow the cleaning
procedure described below.
• If the air filter appears damaged, contact
a trained and qualified professional for a
replacement air filter assembly.
Figure 75
Rinnai Tankless Water Heater Installation and Operation Manual 79
CLEANING
1. Power OFF the water heater
• Push the “On/Off” button located on the right-hand side of the controller. The display will go blank
when the power is off.
2. Remove the front panel.
• Remove the four screws securing the front panel.
• Remove the front panel and locate the filter at the upper right-hand corner of the water heater.
• Remove the air filter by pulling out the “FILTER Pull to Clean” tab
3. Clean the Air Filter
• With mild dish soap and a soft bristle brush, scrub the filter area of the air filter door.
• With clean water, rinse the soap off the filter.
4. Dry the Air Filter: With a lint free towel, dry the air filter.
5. Inspect and Replace the Air Filter
• Inspect the air filter for any debris that may restrict air flow to the water heater.
• If the filter still appears dirty repeat the cleaning steps.
• Replace the air filter.
6. Power ON the water heater.
Do not operate this water heater if the air filter is not in place.
NOTE
Figure 76
Rinnai Tankless Water Heater Installation and Operation Manual 80
6.3 Flushing the Heat
Exchanger
This water heater includes a service indicated/
reminder (Service Soon, SS). When selected in
the parameter settings, an SS code will display
on the controller indicating that it is time to flush
and service the water heater. Failure to flush
the appliance will cause damage to the heat
exchanger. Damage caused by lime build-up is
not covered by the water heater’s warranty. Rinnai
strongly recommends installation of isolation
valves to allow for flushing of the heat exchanger.
1. Turn off power at the controller.
2. Disconnect electrical power to the water
heater.
3. Close the shutoff valves on both the hot water
and cold water lines (V3 and V4).
4. Connect pump outlet hose (H1) to the cold
water line at service valve (V2).
5. Connect drain hose (H3) to the hot water line
at service valve (V1).
6. Pour four gallons of undiluted virgin, food
grade, white vinegar into pail.
7. Place the drain hose (H3) and the hose (H2)
to the pump inlet into the cleaning solution.
8. Open both service valves (V1 and V2) on the
hot water and cold water lines.
9. Operate the pump and allow the vinegar to
circulate through the water heater for at least 1
hour at a rate of four gallons per minute (15.1
liters per minute).
10. Turn off the pump.
11. Rinse the vinegar from the water heater as
follows:
E. Remove the free end of the drain hose (H3)
from the pail. Place in sink or outside to
drain.
F. Close service valve (V2) and open shutoff
valve (V4). Do not open shutoff valve (V3).
G. Allow water to flow through the water heat-
er for five minutes.
H. Close shutoff valve (V4). When unit has
finished draining remove the in-line filter
at the cold water inlet and clean out any
residue. Place filter back into unit and open
valve (V4).
I. Close service valve (V1) and open shutoff
valve (V3).
12. Disconnect all hose
13. Restore electrical power to the water heater.
Scale build-up will affect the performance of the
water heater. Water should be treated. Rinnai
offers Southeastern Filtration’s “ScaleCutter
Water Conditioning System” that offers superior
lime scale prevention and corrosion control by
feeding a blend of scale control compounds into
the cold water supply.
NOTE
HOT
COLDON!
Cold Drain
Valve
Cold Isolation
Valve
PRV Lever
Hot Isolation
Valve
Hot Drain
Valve
Condensate
Trap Drain Plug
Co
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s
a
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e
HO
T
PR
V
CO
L
D
Figure 77: Piping Diagram
Rinnai Tankless Water Heater Installation and Operation Manual 81
6.4 Draining the Water
Heater
To avoid burns, wait until the equipment
cools down before draining the water. The
water in the appliance will remain hot after it
is turned off.
WARNING
If the water heater is not going to be used
during a period of possible freezing weather, it
is recommended that the water inside the water
heater be drained.
To manually drain the water:
1. Shut off cold water supply and gas supply.
2. Turn off the temperature controller.
3. Disconnect the power to the water heater.
4. Close the hot and cold isolation valves.
5. Open the pressure relief valve (PRV) lever.
6. Open the hot and cold drain valves.
7. Remove the condensate trap drain plug and
allow to drain.
To resume normal operation:
1. Confirm that the gas supply is turned off, all
taps are closed and PRV lever is closed.
2. Insert the condensate trap drain plug.
3. Close the hot and cold drain valves.
4. Open the cold and hot water isolation valves.
5. Open a tap and confirm that water flows, and
then close.
6. Connect power to the water heater.
7. After confirming that the temperature controller
is off, turn on the gas supply.
8. Turn on the temperature controller.
Running a low volume of water through the
water heater to prevent freezing:
If the temperature exceeds the ability of the water
heater to freeze protect itself, or if power is lost,
the following steps may prevent the water heater
and external piping from freezing. Units connected
with EZConnect™ (2-unit link) should be drained
to prevent freezing if not in use.
1. Turn the water heater off and close the gas
supply valve.
2. Turn on a hot water tap to flow water about 0.1
gal/min (0.4 L/min) or where
the stream is about 0.2 in. (5
mm) thick.
When the water heater or
external piping has frozen:
1. Do not operate the water heater if the unit or
the external piping is frozen.
2. Close the gas and water valves and turn off
the power.
3. Wait until the water thaws. Check by opening
the water supply valve.
4. Check the water heater and the piping for
leaks.
Rinnai Tankless Water Heater Installation and Operation Manual 82
3. SIGNAGE. A metal or plastic identification
plate shall be permanently mounted to the
exterior of the building at a minimum height
of 8 ft above grade directly in line with the
exhaust vent terminal for the horizontally
vented gas fueled heating appliance or
equipment. The sign shall read, in print size
no less than one-half (1/2) inch in size, “GAS
VENT DIRECTLY BELOW. KEEP CLEAR OF
ALL OBSTRUCTIONS.”
4. INSPECTION. The state or local gas
inspector of the side wall horizontally vented
gas fueled equipment shall not approve
the installation unless, upon inspection,
the inspector observes carbon monoxide
detectors and signage installed in accordance
with the provisions of 248 CMR 5.08(2)(a)1
through 4.
7. 7. AppendicesAppendices
Topics in this section
• Massachusetts State Gas Regulations
• Wiring Diagram
• Ladder Diagram
• Pressure Drop and Water Flow Curves
• Guidelines for Additional Temperature
Controllers
7.1 Massachusetts State
Gas Regulations
For Gas Models Sold in Massachusetts
NOTICE BEFORE INSTALLATION:
This direct-vent appliance must be installed by a
properly trained licensed professional. If you are
not properly trained, you must not install this unit.
IMPORTANT: In the State of Massachusetts
(248 CMR 4.00 & 5.00):
For all side wall horizontally vented gas fueled
equipment installed in every dwelling, building or
structure used in whole or in part for residential
purposes, including those owned or operated
by the Commonwealth and where the side wall
exhaust vent termination is less than 7 ft above
finished grade in the area of the venting, including
but not limited to decks and porches, the following
requirements shall be satisfied:
1. INSTALLATION OF CARBON MONOXIDE
DETECTORS. At the time of installation of
the side wall horizontal vented gas fueled
equipment, the installing plumber or gas
fitter shall observe that a hard-wired carbon
monoxide detector with an alarm and battery
back-up is installed on the floor level where
the gas equipment is to be installed. In
addition, the installing plumber or gas fitter
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Rinnai Tankless Water Heater Installation and Operation Manual 83
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Rinnai Tankless Water Heater Installation and Operation Manual 84
7.2 Wiring Diagram
PC
B
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A
R
D
Rinnai Tankless Water Heater Installation and Operation Manual 85
7.3 Ladder Diagram
Figure 80
Rinnai Tankless Water Heater Installation and Operation Manual 86
7.4 Pressure Drop and Water Flow Curves
Pr
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RU160RU130 RU180 RU199
Dashed lines represent flow rate
after parameter adjustment.
The chart below applies only to incoming water temperatures of 70°F (21°C) or less. For incoming water
temperatures greater than 70°F (21°C), please contact Rinnai.
Delta T - Temperature Rise (°F)
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NOTE: Maximum flow rates may vary based
on set temperature, Delta T and altitude.
Dashed lines represent flow rate
after parameter adjustment.
RU180
RU199
RU160
RU130
Figure 81: Pressure Drop Curve
Figure 82: Water Flow Curve
Rinnai Tankless Water Heater Installation and Operation Manual 87
7.5 Guidelines for Additional Temperature Controllers
All Rinnai Tankless Water Heaters are equipped
with an integrated digital temperature controller
that allows for a precise water temperature set-
point. Additional digital temperature controllers are
available as accessories and must be purchased
separately (detailed installation steps included with
purchase).
Wiring
A maximum of four temperature controllers can
be installed for a water heater or bank of water
heaters; this includes the controller built into a
Rinnai Tankless Water Heater. Controllers can only
be wired in parallel; they cannot be wired in series.
Cable Lengths and Sizes
The temperature controller cable should be a non-
polarized two-core cable with a minimum gauge
of 22 AWG. The maximum cable length from each
temperature controller to the water heater depends
on the total number of wired controllers connected
to the water heater.
Number of Wired
Controllers
Maximum Cable
Length for Each
Controller to Water
Heater
1 328 ft (100 m)
2 164 ft (50 m)
3 or 4 *65 ft (20 m)
Four Temperature
Controllers
Connect controller cable to
mating terminal at bottom
right side of PC Board.
Wiring illustration
(Detailed wiring instructions
included with temperature
controller package)
* Only three additional controllers can be wired
to the water heater.
Location
• The temperature controller should be out of
reach of small children.
• Avoid locations where the temperature
controller may become hot (near an oven
or radiant heater).
• Avoid locations in direct sunlight. The digi-
tal display may be difficult to read in direct
sunlight.
• Avoid locations where the temperature con-
troller could be splashed with liquids.
• Do not install in locations where the tem-
perature controller can be adjusted by the
public.
Figure 83
Figure 84
Table 34
Rinnai Tankless Water Heater Installation and Operation Manual 88
8. 8. WarrantyWarranty
What is Covered?
The Rinnai Standard Limited Warranty covers any defects in materials or workmanship when the
product is installed and operated according to Rinnai written installation instructions, subject to the terms
within this Limited Warranty document. This Limited Warranty applies only to products that are installed
correctly in the United States and Canada. Improper installation may void this Limited Warranty. It is
recommended that a trained and qualified professional who has attended a Rinnai installation training
class complete your installation. This Limited Warranty coverage, as set out in the table below, extends
to the original purchaser and subsequent owners, but only while the product remains at the site of the
original installation, and terminates if the product is moved or reinstalled at a new location.
Item
Period of Coverage (From Date of Purchase)
Residential Applications Commercial Applications
Heat Exchanger 15 Years[1]8 Years[2]
All Other Parts and Components 5 Years 5 Years
Reasonable Labor 1 Year 1 Year
[1] For residential applications, the heat exchanger warranty is 15 years or 12,000 operation hours, whichever occurs first.
[2] For commercial applications, the heat exchanger warranty is 8 years or 12,000 operation hours, whichever occurs first.
Notes:
From date of purchase, period of coverage is reduced to 8 years or 12,000 operation hours, whichever occurs first, if the Rinnai
Tankless Water Heater temperature settings exceed 160°F (71°C).
The integrated controller has a 1 year warranty on parts.
What Will Rinnai Do?
Rinnai will repair or replace the covered product or any part or component that is defective in
materials or workmanship as set forth in the above table. Rinnai will pay reasonable labor charges
associated with the repair or replacement of any such part or component during the term of the labor
warranty period. All repair parts must be genuine Rinnai parts. All repairs or replacements must be
performed by a qualified professional who is properly trained to do the type of repair.
Replacement of the product may only be authorized by Rinnai at its sole discretion. Rinnai does not
authorize any person or company to assume for it any obligation or liability in connection with the
replacement of the product. If Rinnai determines that repair of a product is not possible, Rinnai may
replace the product with a comparable product at Rinnai’s sole discretion. The warranty claim for
product parts and labor may be denied if a component or product returned to Rinnai is found to be free
of defects in material or workmanship; damaged by improper installation, use or operation; or damaged
during return shipping.
How To Obtain Service
For the name of a trained and qualified professional, please contact your place of purchase, visit the
Rinnai website (www.rinnai.us), call Rinnai at 1-800-621-9419 or write to Rinnai at 103 International Drive,
Peachtree City, Georgia 30269.
Proof of purchase is required to obtain warranty service. You may show proof of purchase with a dated
sales receipt, or by registering within 30 days of purchasing the product. To register your Rinnai
Tankless Water Heater, please visit www.rinnai.us. For those without internet access, please call
1-800-621-9419. Receipt of registration by Rinnai will constitute proof-of-purchase for this product.
Registration of product installed in new home construction may be verified with a copy of the closing
papers provided by the initial home buyer. However, registration is not necessary in order to validate this
Limited Warranty.
Rinnai Tankless Water Heater Installation and Operation Manual 89
What Is Not Covered?
This Limited Warranty does not cover any failures or operating difficulties due to the following:
• Accident, abuse, or misuse
• Alteration of the product or any component part
• Misapplication of this product
• Improper installation (such as but not limited to)
• Product being installed in a corrosive environment
• Condensate damage
• Improper venting
• Incorrect gas type
• Incorrect gas or water pressure
• Absence of a drain pan under the appliance
• Improper maintenance (such as but not limited to scale build-up, freeze damage, or vent
blockage)
• Incorrect sizing
• Any other cause not due to defects in materials or workmanship
• Problems or damage due to fires, flooding, electrical surges, freezing or any acts of God
• Any damage caused by poor water quality
• Operating the water heater with anything other than potable water at all times
• Force majeure
There is no warranty coverage on product installed in a closed loop application, commonly associated
with space heating only applications.
Use of an MCC-91-2 controller in a residential dwelling will reduce the warranty coverage to that of
a commercial warranty application except when an MCC-91-2 is used with a hydronic air handler for
temperatures no higher than 160°F (71°C).
This Limited Warranty does not apply to any product whose serial number or manufacture date has been
defaced.
This Limited Warranty does not cover any product used in an application that uses chemically treated
water such as a pool or spa heater.
Limitation on Warranties
No one is authorized to make any other warranties on behalf of Rinnai America Corporation. Except as
expressly provided herein, there are no other warranties, expressed or implied, including, but not
limited to warranties of merchantability or fitness for a particular purpose, which extend beyond the
description of the warranty herein.
Any implied warranties of merchantability and fitness arising under state law are limited in duration to
the period of coverage provided by this Limited Warranty, unless the period provided by state law is
less. Some states do not allow limitations on how long an implied Limited Warranty lasts, so the above
limitation may not apply to you.
Rinnai shall not be liable for indirect, incidental, special, consequential or other similar damages that
may arise, including lost profits, damage to person or property, loss of use, inconvenience, or liability
arising from improper installation, service or use. Some states do not allow the exclusion or limitation of
incidental or consequential damages, so the above limitation may not apply to you.
This Limited Warranty gives you specific legal rights, and you may also have other rights which vary from
state to state.
www.rinnai.us/warranty
Rinnai Tankless Water Heater Installation and Operation Manual 90
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Rinnai Tankless Water Heater Installation and Operation Manual 91
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100000467(06)
6/2020
Rinnai America Corporation
103 International Drive
Peachtree City, GA 30269
Tel: 1-800-621-9419
Web: rinnai.us
rinnai.ca