HomeMy WebLinkAboutFile Documents.155 Lone Pine Rd.0318.2017 (24).ARBKNPE Series Tankless Water Heaters
Specification SheetPremium Condensing
Tankless Gas Water Heater
Optional accessories (see below)
Direct Vent (Indoor)
2” Intake Cap
2" Coupling
Mobile/Manufactured Homes
Non-Direct Vent (Indoor) Non-Direct Vent (Outdoor)
2" Pipe
Diagnostics
Information
Reset
Up
Down
Power ON/OFF
NPE-150
NPE-180
NPE-210
NPE-240
NPE-150
NPE-180
NPE-210
NPE-240
Dual Primary and Secondary Stainless Steel Heat
Exchangers
Technology
Buffer Tank Recirculation Pump
Wi-Fi
Common Vent Compatible
Freeze Protection
Uniform Energy Factor Ratings
NPE-180A/210A/240A
NPE-150S
NPE-180S/210S/240S
CSA, NSF 5, AHRI, AB1953 ,SCAQMD
(Rule 1146.2 Type 1 - Complies with 14 ng/J or 20 ppm NOx @ 3% O2)
Natural Gas (NG)Propane (LPG)***
Built-in Control Panel
ANSI Z21.10.3 - CSA 4.3-2015
2” PVC vent up to 60 ft**150 ft**
using 3” PVC vent
1/2” gas pipe up to a length of 24 ft*
Remote Controller
NR-20DU
(30009757A)
Plumb Easy Valve Set (3/4”)
(30009323A - Lead Free)
(30012581A - for Pipe Cover)
Ready-Link
Communication Cable
(GXXX000546)
Outdoor Vent Kit
Condensate Neutralizer
(GXXX001322 - Single Unit)
(GXXX001324 - Up to 6 Units)
(GXXX001325 - Up to 16 Units)
Outdoor
Vent Cap
Built-In Control Panel
with Diagnostics
Sleek Design - Compatible with
2” PVC Vent and 1/2” Gas Pipe
TM
Indoor and Outdoor
Venting Options
Ready-Link Cascade Compatible
Temperature Options
Residential
Commercial
SleekDesign Compatible ith
INTELLIGENT Preheating
(optional for “S” models)
3” Vent Termination
Caps and Wall Flanges
(GXXX3873B)
Job Name: _____________________________________________
Location: ______________________________________________
Engineer: _____________________________________________
Wholesaler: __________________________________________
Contractor: ___________________________________________
Model No.: _____________________________________________
Submitted to: _________________________________________
(30010604A)
15-Year 5-Year
8-Year 5-Year
(**** see Navien Limited Warranty)
External Pump Wire
(GXXX001319)04/06/2018
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Dimensions Specifications
27.4" (695mm)28.8" (731mm) 3" (77mm)6.7" (170mm)4.5" (115mm)0.4" (10mm)1.5" (38mm)14.3" (364mm)2.6" (67mm)A B
13.2" (336mm) 2.3"
(60mm)
3.0"
(77mm)
8.3"
(212mm)
17.3" (440mm)2.4" (61mm)2.4" (61mm)C F D G E
NPE Series Tankless Water Heaters
Specification SheetPremium Condensing
Tankless Gas Water Heater
A
B
C
F
D
G
E
Air Intake Φ 2"
Exhaust Gas vent Φ 2"
Hot Water Outlet Φ 3/4"
Recirculation Inlet* Φ 3/4"
Cold Water Inlet Φ 3/4"
Gas Inlet Φ 3/4"
Condensate Outlet Φ 1/2"
Connection Size
Connection Size
Navien, Inc. 20 Goodyear, Irvine, CA 92618 Ph: (949)420-0420 Fax: (949)420-0430 www.Navien.com Rev. 11/16
* “A” models only
Item NPE-150S NPE-180A NPE-180S NPE-210A NPE-210S NPE-240A NPE-240S
Heat
Capacity
(Input)
Natural Gas 18,000-
120,000
BTU/H
15,000-150,000 BTU/H 19,900-180,000 BTU/H 19,900-199,900 BTU/H
Propane Gas 15,000-150,000 BTU/H 19,900-180,000 BTU/H 19,900-199,900 BTU/H
Efficiency
Ratings
UEF (for NG & LP)0.96 0.96 0.97 0.96 0.97 0.96 0.97
EF (Canada) (for NG & LP)0.97 0.97 0.99 0.97 0.99 0.97 0.99
Flow Rate
(DHW)
35°F(19°C) Temp Rise 6.8 GPM
(26 L/m) 8.4 GPM (32 L/m) 10.1 GPM (38 L/m) 11.2 GPM (42 L/m)
45°F(25°C) Temp Rise 5.3 GPM
(20 L/m)6.5 GPM (25 L/m) 7.8 GPM (30 L/m) 8.7 GPM (33 L/m)
67°F(36°C) Temp Rise 3.2 GPM
(12 L/m)
4.3 GPM
(16 L/m)
4.2 GPM
(16 L/m)
Dimensions 17.3"(W) x 27.4"(H) x 13.2"(D)
Weight 55 lbs
(25kg)
75 lbs
(34kg)
67 lbs
(30kg)
82 lbs
(37 kg)
75 lbs
(34kg)
82 lbs
(37 kg)
75 lbs
(34kg)
Installation Type Indoor or Outdoor Wall-Hung
Venting Type Forced Draft Direct Vent
Ignition Electronic Ignition
Water Pressure 15-150 PSI
Natural Gas Supply Pressure
(from source)3.5 in WC-10.5 in WC
Propane Gas Supply Pressure
(from source)8 in WC-13in WC
Natural Gas Manifold Pressure
(min-max)
-0.04 in WC -
-0.38 in WC -0.04 in WC - -0.84 in WC -0.05 in WC - -0.36 in WC -0.05 in WC - -0.58 in WC
Propane Gas Manifold Pressure
(min-max)
-0.04 in WC -
-0.42 in WC -0.05 in WC - -0.50 in WC -0.10 in WC - -0.66 in WC -0.10 in WC - -0.78 in WC
Minimum Flow Rate 0.5 GPM (1.9 L/m), < 0.01 GPM (0.04 L/m) option for “A” models*
Connection
Sizes
Cold Water Inlet 3/4 in NPT
Hot Water Outlet 3/4 in NPT
Gas Inlet 3/4 in NPT
Power
Supply
Main Supply 120V AC, 60Hz
Maximum Power
Consumption 200W (max 2A), 350W (max 4A) with external pump connected
Materials
Casing Cold Rolled Carbon Steel
Heat Exchangers Primary Heat Exchanger: Stainless Steel
Secondary Heat Exchanger: Stainless Steel
Venting
Exhaust 2" or 3" PVC, CPVC, Polypropylene
2" or 3" Special Gas Vent Type BH (Class II, A/B/C)
Intake 2" or 3" PVC, CPVC, Polypropylene
2" or 3" Special Gas Vent Type BH (Class II, A/B/C)
Vent Clearances 0" to combustibles
Safety
Devices
Flame Rod, APS, Ignition Operation Detector, Water Temperature High Limit Switch, Exhaust Temperature High Limit Sensor,
Power Surge Fuse
5.0 GPM
(19 L/m)
5.2 GPM
(20 L/m)
5.6 GPM
(21 L/m)
5.7 GPM
(22 L/m)
* Available for “A” models configured in an optional ComfortFlow recirculation mode. Additional energy use will occur when using recirculation.
04/06/2018
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 instructions.
If you cannot reach your gas supplier, call the fire department.
Installation and service must be performed by a qualified installer, service agency or the gas supplier.
The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code,
ANSIZ223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Code.
When applicable, the installation must conform with the Manufactured Home Construction and Safety
Standard, Title 24 CFR, Part 3280 and/or CAN/CSA Z240 MH Series, Mobile Homes.
* Lead Free
Keep this manual near this water heater for future reference
whenever maintenance or service is required.
* The wetted surface of this product contacted by consumable water contains
less than one quarter of one percent (0.25%) of lead by weight.
Installation Manual
NPE Condensing Water Heaters
Model NPE-180A
NPE-210A
NPE-240A
NPE-150S
NPE-180S
NPE-210S
NPE-240S
04/06/2018
2Contents
6. Appendixes 54
6.1 Gas Conversion 54
6.2 Technical Data 60
6.3 Wiring Diagram 63
6.4 Ladder Diagram 65
6.5 Component Assembly Diagrams and Parts Lists 67
6.6 Installation Check list 79
6.7 Navien H2Air Add-on Controller Kit (Optional) 81
6.8 Navien HotButton Kit (Optional) 82
6.9 Requirements for the State of Massachusetts 83
1. Safety Information 3
2. About the Water Heater 5
2.1 Items Included 5
2.2 Accessories 5
2.3 Specifications 6
2.5 Components 8
2.6 Dimensions 11
2.7 Rating Plate 13
3. Installing the Water Heater 14
3.1 Choosing an Installation Location 14
3.2 Mounting the Water Heater to the Wall 15
3.3 Connecting the Gas Supply 16
3.4 Connecting the Water Supply 20
3.5 Connecting the Condensate Drain 26
3.6 Venting the Water Heater 29
3.7 Connecting the Power Supply 37
3.8 Setting the DIP Switches 37
4. Installing a Cascade System 39
4.1 Connecting Water Supplies 39
4.2 Connecting the Communication Cables 40
5. Installing a Common Vent System 42
About the Common Vent System 42
Navien Backflow Damper (Back-draft Damper) 46
Starting the Common Vent System 47
Connecting and Terminating the Vent Pipe 49
Setting Up the Common Vent System 50
Common Vent Termination Clearances 51
Exhaust Vent Termination Clearances (For Direct Vent) 52
Maintenance 53
Contents
04/06/2018
3Safety Information
The following safety symbols are used in this manual. Read and
follow all safety instructions in this manual precisely to avoid
unsafe operating conditions, fire, explosion, property damage,
personal injury, or death.
DANGER
Indicates an imminently hazardous situation which, if not
avoided, could result in severe injury or death.
WARNING
Indicates a potentially hazardous situation which, if not
avoided, could result in injury or death.
CAUTION
Indicates a potentially hazardous situation which, if not
avoided, could result in property damage.
DANGER
If you smell gas:
Do not try to light any appliance.
Do not touch any electrical switches or use landline phones.
From a neighbor’s phone, call your gas provider and follow
their instructions.
If you cannot reach your gas provider, call the fire
department.
Do not use or store flammable products, such as gasoline,
solvents, or adhesives in the same room or area as the
water heater.
The water heater has a main burner flame that can turn on
at any time and can ignite flammable vapors. Vapors from
flammable liquids can explode and catch fire, causing death
or severe burns.
Vapors cannot be seen and are heavier than air. They can
travel long distances along the ground and can be carried
from other rooms to the water heater’s main burner flame
by air current.
Keep all flammable products far away from the water heater
and store them in approved containers. Keep the containers
closed tightly and out of the reach of children and pets.
1. Safety Information
04/06/2018
4 Safety Information
CAUTION
Do not turn on the water heater unless the water and gas
supplies are fully opened.
Doing so may damage the water heater.
Do not turn on the water if the cold water supply shut-
off valve is closed.
Doing so may damage the water heater.
Do not use this water heater for anything other than its
intended purpose, as described in this manual.
When servicing the controls, label all wires prior to
disconnecting them.
Failure to do so may result in wiring errors, which can lead to
improper or dangerous operation. Verify proper operation
after servicing.
Do not use unapproved replacement or accessory parts.
Doing so may result in improper or dangerous operation
and will void the manufacturer’s warranty.
Do not place anything in or around the vent terminals,
such as a clothes line, that could obstruct the air flow in
or out of the water heater.
This water heater has been approved for use in the USA
and Canada only.
Using the water heater in any other country will void the
manufacturer’s warranty.
WARNING
Do not store or use gasoline or other flammable liquids
near this water heater.
Doing so may result in fire or explosion.
Do not place combustibles, such as newspapers or
laundry, near the water heater or venting system.
Doing so may result in a fire.
Do not place or use hair sprays, spray paints, or any other
compressed gases near the water heater or venting
system, including the vent termination.
Doing so may result in fire or explosion.
Do not remove the front cover unless the power to the
water heater is turned off or disconnected.
Failure to do so may result in electric shock.
Do not operate the water heater with the front cover
opened.
Doing so may result in fire or carbon monoxide (CO)
poisoning, which may result in property damage, personal
injury, or death.
Do not operate this water heater without proper venting.
Doing so may result in fire or carbon monoxide (CO)
poisoning, which may result in property damage, personal
injury, or death.
Do not touch the power cord or internal components of
the water heater with wet hands.
Doing so may result in electric shock.
04/06/2018
5About the Water Heater
2.1 Items Included
When you open the box, you will find the following items with the
water heater. Check the box for each of the following items before
installing the water heater.
Installation &
Operation Manual Quick Installation Manual
Wall Mounting Bracket Tapping Screws & Anchors
2 in Vent Termination Caps 2 in Wall Flanges
Conversion Kit Spare Parts
2.2 Accessories
The following optional accessories are available for the water
heater:
Remote Controller Plumb Easy Valve Set
Pressure Relief Valve Condensate Neutralizer
Ready-Link
Communication Cable Outdoor Vent Kit
3 in Vent Termination Caps 3 in Wall Flanges
External Pump Connector
(<150W,1.5A)
Navien HotButton Kit / H2Air
Add-on Controller Kit
Navi-Link
(Wi-Fi Control System Ready-Link Rack
2. About the Water Heater
04/06/2018
6 About the Water Heater
2.3 Specifications
The following table lists the specifications for the water heater. Additional specifications about water, gas, electric, and air supplies (venting)
appear in the Installation section.
Item NPE-150S NPE-180(A) NPE-180S NPE-210(A) NPE-210S NPE-240(A) NPE-240S
Heat
Capacity
(Input)
Natural Gas 18,000-
120,000
BTU/H
15,000-150,000 BTU/H 19,900-180,000 BTU/H 19,900-199,900 BTU/H
Propane Gas 15,000-150,000 BTU/H 19,900-180,000 BTU/H 19,900-199,900 BTU/H
Energy
Factor
UEF (for NG & LP)0.96 0.96 0.97 0.96 0.97 0.96 0.97
EF (Canada) (for NG & LP)0.97 0.97 0.99 0.97 0.99 0.97 0.99
Flow Rate
(DHW)
35 °F (19 °C) Temp Rise 6.8 GPM (25.8
L/m)8.4 GPM (32 L/m) 10.1 GPM (38 L/m) 11.2 GPM (42 L/m)
45 °F (25 °C) Temp Rise 5.3 GPM
(20 L/m)6.5 GPM (25 L/m) 7.8 GPM (30 L/m) 8.7 GPM (33 L/m)
67 °F (36 °C) Temp Rise 3.2 GPM
(12 L/m)
4.3 GPM
(16 L/m)
4.2 GPM
(16 L/m)
5.0 GPM
(19 L/m)
5.2 GPM
(20 L/m)
5.6 GPM
(21 L/m)
5.7 GPM
(22 L/m)
Dimensions 17.3 in (W) x 27.4 in (H) x 13.2 in (D)
Weight 62 lbs
(28 kg)
75 lbs
(34 kg)
67 lbs
(30 kg)
82 lbs
(37 kg)
75 lbs
(34 kg)
82 lbs
(37 kg)
75 lbs
(34 kg)
Installation Type Indoor or Outdoor Wall-Hung
Venting Type Forced Draft Direct Vent
Ignition Electronic Ignition
Water Pressure 15-150 PSI
Natural Gas Supply Pressure
(from source)3.5 in WC-10.5 in WC
Propane Gas Supply Pressure
(from source)8 in WC-13in WC
Natural Gas Manifold Pressure
(min-max)
-0.04 in WC -
-0.40 in WC -0.04 in WC - -0.84 in WC -0.05 in WC - -0.36 in WC -0.05 in WC - -0.58 in WC
Propane Gas Manifold Pressure
(min-max)
-0.05 in WC -
-0.42 in WC -0.05 in WC - -0.50 in WC -0.10 in WC - -0.66 in WC -0.10 in WC - -0.78 in WC
Minimum Flow Rate 0.5 GPM (1.9 L/m), < 0.01 GPM (0.04 L/m) option for “A” models*
Connection
Sizes
Cold Water Inlet 3/4 in NPT
Hot Water Outlet 3/4 in NPT
Gas Inlet 3/4 in NPT
Power
Supply
Main Supply 120 V AC, 60 Hz
Maximum Power
Consumption 200 W (max 2 A), 350 W (max 4 A) with external pump connected
Materials
Casing Cold Rolled Carbon Steel
Heat Exchangers Primary Heat Exchanger: Stainless Steel
Secondary Heat Exchanger: Stainless Steel
Venting
Exhaust 2 in or 3 in PVC, CPVC, Approved Polypropylene
2 in or 3 in Special Gas Vent Type BH (Class II, A/B/C)
Intake 2 in or 3 in PVC, CPVC, Approved Polypropylene
2 in or 3 in Special Gas Vent Type BH (Class II, A/B/C)
Vent Clearances 0 in to combustibles
Safety
Devices
Flame Rod, APS, Ignition Operation Detector, Water Temperature High Limit Switch, Exhaust Temperature High Limit Sensor,
Power Surge Fuse
* Available for “A” models configured in an optional ComfortFlow recirculation mode. Energy consumption will increase when the system is
configured for recirculation.
04/06/2018
7About the Water Heater
a
b
c
d
e
f
g
h
i
j
k
2.4 The Front Panel
The front panel allows you to adjust the water temperature and
view the operating status or error codes. Remove the protective
sheet from the front panel before using it.
a
Error
g
Master Unit
A code will appear on the display Cascade operation
b
Hot Water Recirculation
h
Display
Recirculation Mode
c
Diagnostics button
i
Up button
For installers only Increases the temperature
d
Information button
j
Down button
Shows basic information Decreases the temperature
e
Reset button
k
Power button
Resets the water heater (When an error occurs)Turns the water heater on or off
f
Combusting
When the gas burner is on
04/06/2018
8 About the Water Heater
2.5 Components
The following diagram shows the key components of the water heater. Component assembly diagrams and particular parts lists are included
in the Appendixes.
Intake Air Duct
Exhaust Duct
Exhaust Limit Temperature Sensor
Exhaust Body
Ignition Transformer
Burner
Primary Heat Exchanger
Secondary Heat Exchanger
Flow Sensor
Condensate Trap
Front Panel
PCB Box
Water Adjustment Valve
Water Inlet Filter
Condensate Drain Fitting
Condensate Drain Lid
Fan Motor
Dual Venturi
Gas Pipe
APS (Air Pressure Sensor)
Buffer Tank
Circulation Pump
Gas Valve
Gas Inlet Fitting
DHW Supply Fitting
2-Way Valve
Recirculation Inlet Fitting
[NPE-180A/ 210A/ 240A]
04/06/2018
9About the Water Heater
Intake Air Duct
Exhaust Duct
Exhaust Limit Temperature Sensor
Exhaust Body
Ignition Transformer
Burner
Primary Heat Exchanger
Secondary Heat Exchanger
Flow Sensor
Condensate Trap
Front Panel
PCB Box
Mixing Valve
Water Inlet Filter
Condensate Drain Fitting
Condensate Drain Lid
Fan Motor
Single Venturi
Gas Pipe
APS (Air Pressure Sensor)
Gas Valve
Freeze Protection Switch
Gas Inlet Fitting
Water Adjustment Valve
DHW Supply Fitting
[NPE-150S]
04/06/2018
10 About the Water Heater
Intake Air Duct
Exhaust Duct
Exhaust Limit Temperature Sensor
Exhaust Body
Ignition Transformer
Burner
Primary Heat Exchanger
Secondary Heat Exchanger
Flow Sensor
Condensate Trap
Front Panel
PCB Box
Mixing Valve
Water Inlet Filter
Condensate Drain Fitting
Condensate Drain Lid
Fan Motor
Dual Venturi
Gas Pipe
APS (Air Pressure Sensor)
Gas Valve
Freeze Protection Switch
Gas Inlet Fitting
Water Adjustment Valve
DHW Supply Fitting
[NPE-180S/ 210S/ 240S]
04/06/2018
11About the Water Heater
2.6 Dimensions
The following diagrams show the dimensions of the water heater and the table lists the supply connections.27.4 in (695 mm)28.8 in (731 mm) Supply Connections
Description Diameter
A Air Intake 2 in
B Exhaust Gas Vent 2 in
C Hot Water Outlet
3/4 in
D Recirculation Inlet
3/4 in
E Cold Water Inlet
3/4 in
F Gas Inlet
3/4 in
G Condensate Outlet
1/2 in
Overhead View
3 in (77 mm)6.7 in (170 mm)4.5 in (115 mm)0.4 in (10 mm)1.5 in (38 mm)14.3 in (364 mm)2.6 in (67 mm)A B
Supply Connections
13.2 in (336 mm)2.3 in (60 mm)3.0 in (77 mm) 8.3 in (212 mm)
17.3 in (440 mm)2.4 in (61 mm)2.4 in (61 mm)C F D G E
[NPE-180A/ 210A/ 240A]
04/06/2018
12 About the Water Heater27.4 in (695 mm)28.8 in (731 mm) Supply Connections
Description Diameter
A Air Intake 2 in
B Exhaust Gas Vent 2 in
C Hot Water Outlet
3/4 in
D Cold Water Inlet
3/4 in
E Gas Inlet
3/4 in
F Condensate Outlet
1/2 in
Overhead View
3 in (77 mm)6.7 in (170 mm)4.5 in (115 mm)0.4 in (10 mm)1.5 in (38 mm)14.3 in (364 mm)2.6 in (67 mm)A B
Supply Connections
13.2 in (336 mm)2.4 in (61 mm)C F DE
2.3 in (60 mm)11.3 in (289 mm)
17.3 in (440 mm)2.4 in (61 mm)[NPE-150S/180S/ 210S/ 240S]
04/06/2018
13About the Water Heater
2.7 Rating Plate
Water Heaters come from the factory configured for use with Natural Gas (NG). Before starting the installation, check the rating plate
located on the side of the water heater to ensure that the water heater matches the gas type, gas pressure, water pressure, and electrical
supply available in the installation location. If the water heater does not match each of these ratings, do not install the water heater. If
conversion to Propane Gas is required, the included gas conversion kit must be used. Refer to “6.1 Gas Conversion” for details.
Rating Plate, *Plaque Signalétique
Direct Vent Automatic Instantaneous Water Heater *Chauffe-eau instantané automatique à évent direct
For Indoor, Outdoor or Manufactured Home (Mobile Home) Installation *Pour installation dans une maison préfabriquée (mobile)
Navien, Inc.
20 Goodyear, Irvine, CA 92618
Tel: 1-800-519-8794
Orifices necessary for LP conversion are provided. *Les injectures nécessaires à la conversion au GPL sont fournis.
Failure to use the correct gas can cause problems which can result in death, serious injury or property damage. *Le fait de ne pas
utiliser le bon gaz peut causer des problèmes qui peuvent mener à la mort, causer des blessures graves ou endommager la propriété.
Consult your installation manual for more information. *Consultez votre manuel d’installation pour plus d’information.
Suitable for combination water (potable) heating and space heating and not suitable for space heating applications only.
*Convient au chauffage combiné de l’eau (potable) et des locaux, mais non au chauffage des locaux seulement.
This appliance is certified for use at altitudes up to 4,500 ft (1,370 m) in accordance to the latest CAN/CGA 2.17-High Altitude Installation
procedures at normal manifold pressure. For installation instructions at altitudes higher than 4,500 ft, please contact Navien. *Cet appareil
est certifié pour une utilisation à des altitudes de 0 à 4,500 pieds (1,370 m) conformément aux toutes les procédures d’installation à haute
altitude CAN/CGA 2.17 à une pression normale. Pour les installations à élévations en haut de 4,500 pieds, appeler le bureau de Navien.
This appliance must be installed in accordance with local codes, or in the absence of local codes, the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 or the CSA B149.1, Natural Gas and Propane Installation Code. *Cet appareil doit être installé selon les règlements
locaux, ou en l’absence de tels règlements, selon le National Fuel Gas Code, ANSI Z223.1/NFPA 54, ou les, Code d'installation du gaz
natural et du propane, CSA-B149.1.
Model No., *Numéro de modèle
NPE-210A
Max. Input Rating, *Entrée GPL max.
180,000 Btu/h
Recovery Rating, *Calibre de recouvrement
Max. Inlet Gas Pressure, *Pression max. de gaz d’entrée
Min. Inlet Gas Pressure, *Pression min. de gaz d’entrée
Manifold Pressure, *Pression d’admission
Electrical Rating, *Régime nominal électrique
Max. Water Pressure, *Pression d’eau max.
Type of Gas, *Type de gaz
NG
Min. Input Rating, *Débit calorifique max.
19,900 Btu/h
265 Gallons/Hour, *gallons/heures
10.5 Inches W.C. *pouces W.C.
3.5 Inches W.C. *pouces W.C.
-0.36 Inches W.C. *pouces W.C.
AC *c.a. 120 Volts 60Hz, less than 2 amperes, *Utilise moins de 2A
150 psi *lb/po2 ANSI Z21.10.3 · CSA 4.3-2011
FOR YOUR SAFETY *POUR VOTRE SÉCURITÉ
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other gas appliances. *Ne rangez
pas et n'utilisez pas d'essence ou d'autres liquides ou vapeurs inflammables près de cet appareil ou de tout autre appareil électroménager.
WARNING
Be sure the gas type and electricity voltage match the rating plate. Using a different gas type will cause abnormal combustion and water
heater malfunction.
Using abnormally high or low AC voltage may cause abnormal operation, and may reduce the life expectancy of this product.
04/06/2018
14 Installing the Water Heater
3.1 Choosing an Installation Location
When choosing an installation location, you must ensure that
the location provides adequate clearance for the water heater,
adequate venting and drainage options, and sufficient access to
gas, water, and electrical supplies. Carefully consider the following
factors when choosing an installation location:
About Water Quality
Proper maintenance of the water heater is required when water
quality does not meet EPA standards. Damage caused by poor
water quality is not covered under warranty. The following table
shows the maximum contaminant levels allowed, based on the
EPA National Secondary Drinking Water Regulations (40 CFR Part
143.3). If you suspect that your water is contaminated in any way,
discontinue use of the water heater and contact an authorized
technician or licensed professional.
Contaminant Maximum Allowable Level
Total Hardness Up to 200 mg/l (12 grains/gallon)
Aluminum 0.05 to 0.2 mg/l
Chloride Up to 250 mg/l
Copper Up to 1.0 mg/l
Iron Up to 0.3 mg/l
Manganese Up to 0.05 mg/l
pH 6.5 to 8.5
Sulfate Up to 205 mg/l
Total Dissolved Solids (TDS) Up to 500 mg/l
Zinc Up to 5 mg/l
Chlorine Up to 4 mg/l
Access to utilities
Water – the installation location should be near where the
domestic water supply enters the building.
Gas – the installation location should be near where the gas
supply enters the building.
Electricity – the installation location should be near where the
electrical supply enters the building.
Adequate drainage
The water heater produces a significant amount of condensate
Maintain proper clearances from any openings in the building.
Install the water heater with a minimum clearance of 12 in
(300 mm) above an exterior grade or as required by local codes.
Maintain a minimum clearance of 4 ft (1.2 m) from heating and
cooling vents.
Do not enclose the vent termination.
Install the exhaust vent in an area that is free from obstructions
and does not allow the exhaust to accumulate.
Do not install the water heater where moisture from the exhaust
may discolor or damage walls.
Do not install the water heater in bathrooms, bedrooms, or any
other occupied rooms that are normally kept closed or that are
not adequately ventilated.
Proximity to fixtures and appliances
Install the water heater near fixtures that deliver or use hot water,
such as bathroom, kitchen, and laundry room faucets. Select a
location that minimizes the water piping required between major
fixtures. If the distances are long or if the water heater requires
“instant“ hot water, we recommend running a recirculation line
back to the water heater from the furthest fixture. Insulate as
much of the hot water supply and recirculation lines as possible.
For more information about the water supply, refer to “3.4
Connecting the Water Supply“ on page 20.
3. Installing the Water Heater
04/06/2018
15Installing the Water Heater
3.2 Mounting the Water Heater to the Wall
Navien water heaters come with an upper mounting bracket that
is pre-drilled at 16 in on center for easy installation on standard
wall studs. If the strength of the wall is insufficient or if the framing
is non-standard or uneven, reinforce the area before installing the
water heater. Avoid installation on common walls as the unit will
make some operational noises while it is running.
To mount the water heater to the wall:
1. Affix the bracket securely to the wall and ensure that it is level
and that it can support the weight of the water heater.
2. Align the grooves on the back of the water heater with the
tongues on the mounting bracket and hang the water heater
on the bracket.
When mounted with the mounting bracket, the water heater
will have a 5/8 in (16 mm) clearance from the back of the wall.
CAUTION
Do not mount the water heater to dry wall that has not been
reinforced.
Adequate installation clearances
Install the water heater in an area that allows for service and
maintenance access to utility connections, piping, filters, and traps.
Based on the installation location, ensure the following clearances
are maintained:
Clearance from: Indoor Installation Outdoor Installation
Top 9 in (229 mm)
minimum
36 in (900 mm)
minimum
Back 0.5 in (20 mm)
minimum
0.5 in (20 mm)
minimum
Front 4 in (100 mm)
minimum
24 in (600 mm)
minimum
Sides 3 in (76 mm)
minimum
3 in (76 mm)
minimum
Bottom 12 in (300 mm)
minimum
12 in (300 mm)
minimum
Clean, debris and chemical-free combustion air
Do not install the water heater in areas where dust and debris
may accumulate or where hair sprays, spray detergents, chlorine,
or similar chemicals are used.
Do not install the water heater in areas where gasoline or other
flammables are used or stored.
Ensure that combustible materials are stored away from the
water heater and that hanging laundry or similar items do not
obstruct access to the water heater or its venting.
In commercial locations, do not install the water heater in areas
with greasy fumes or heavy amounts of steam or take measures
to prevent fumes and steam from entering the water heater.
High Elevation Installations
This water heater may be installed at elevations up to 10,100 ft
(3,078 m) for use with Natural Gas and 4,500 ft (1,370 m) for
use with Propane. Refer to “3.8.2 Setting the Front Panel DIP
Switches” on page 37 for the appropriate altitude setting.
04/06/2018
16 Installing the Water Heater
To connect the gas supply:
1. Determine the gas type and pressure for the water heater by
referring to the rating plate.
2. Perform a pressure test on the main gas supply line.
3. Purge the gas line of any debris.
4. Determine the proper size and type for the gas line. Refer to
the tables that follow.
5. Install full port valves on the gas supply line and water heater.
6. Connect the gas supply line.
7. Test the supply line, all connection points, and the water
heater for gas leaks.
Union
Gas Shutoff Valve
Gas Supply
Gas Inlet Adapter
Bottom View
Pipe size : 1/2 in to 3/4 in
(inner diameter)
3.3 Connecting the Gas Supply
WARNING
Before connecting the gas supply, determine the gas type
and pressure for the water heater by referring to the rating
plate. Use only the same gas type indicated on the rating
plate. Using a different gas type will result in abnormal
combustion and malfunction of the water heater. Gas
supplies should be connected by a licensed professional
only.
The appliance and its gas connection must be leak tested
before placing the appliance in operation.
This water heater cannot be converted from natural gas
to propane or vice versa without a Navien gas conversion
kit. Do not attempt a field conversion of this water heater
without a Navien gas conversion kit. Doing so will result in
dangerous operating conditions and will void the warranty.
Navien recommends connecting the water heater as the first water
heater downstream of the gas meter, to ensure a sufficient gas
supply.
The water heater is
recommended to be the first
appliance to be connected
to the gas supply line.
Gas Supply Line
Gas meter’s capacity ≥ Total gas
capacity of connected appliances
04/06/2018
17Installing the Water Heater
Note Tighten the water heater connection valves with
care to avoid damage.
The gas connection fitting on all water heaters is
3/4 in.
1/2 in rigid pipe can be used; refer to the sizing
tables on the proceeding pages for limitations.
Avoid using 1/2 in corrugated connectors or tubing
as noise may occur.
Corrugated Connector
When using flexible gas lines, ensure that the
pipe’s inner diameter and connector is sufficient
to supply the required BTUs. Also, ensure that the
flexible line has no crimps or tight bends in it, as
this will restrict gas flow.
When using rigid pipe, Navien recommends the
installation of a union on the gas supply line
close to the water heater, to facilitate any future
maintenance or service.
CAUTION
Prior to using an excess flow valve (EFV) in the gas line, check
the manufacturer's minimum and maximum flow capacity
rating. An improperly sized EFV wil not allow for a full flow of
gas to the water heater and may cause improper operation.
CLOSE: 195MAX OPER: 135BYPASS: 5 KBTU/HRCLOSE: 195
MAX OPER: 135
BYPASS: 5 KBTU/HRExcess Flow Valve
Typical LP Gas piping examples:
2 Stage System with Multiple Regulators (Recommended)
Gas Regulators
(2 Stage)
Full size
Gas Pipe
Gas Tank
High Pressure
Regulator
Low Pressure
Regulator
Single Regulator System
Gas Regulator
12 in W.C.
Gas Tank Full size
Gas Pipe
Full size
Gas Pipe Pipe
04/06/2018
18 Installing the Water Heater
3.3.1 Gas Pipe Sizing Tables (Referenced from 2012 National Fuel Gas Code)
These tables are for reference only. Please consult the gas pipe manufacturer for actual pipe capacities.
Maximum Natural Gas Delivery Capacity
in Cubic Feet (ft3) per Hour (0.60 Specific Gravity; 0.5 in WC Pressure Drop). Contact your gas supplier for BTU/ft3 ratings. Use 1,000 BTU/ft3 for
simplified calculations. This table is recommended for supply pressures less than 6 in WC.
Pipe Size
Length (including fittings)
10 ft
(3 m)
20 ft
(6 m)
30 ft
(9 m)
40 ft
(12 m)
50 ft
(15 m)
60 ft
(18 m)
70 ft
(21 m)
80 ft
(24 m)
90 ft
(27 m)
100 ft
(30 m)
125 ft
(38 m)
3/4 in 360 247 199 170 151 137 126 117 110 104 92
1 in 678 466 374 320 284 257 237 220 207 195 173
1 1/4 in 1,390 957 768 657 583 528 486 452 424 400 355
1 1/2 in 2,090 1,430 1,150 985 873 791 728 677 635 600 532
2 in 4,020 2,760 2,220 1,900 1,680 1,520 1,400 1,300 1,220 1,160 1,020
2 1/2 in 6,400 4,400 3,530 3,020 2,680 2,430 2,230 2,080 1,950 1,840 1,630
3 in 11,300 7,780 6,250 5,350 4,740 4,290 3,950 3,670 3,450 3,260 2,890
4 in 23,100 15,900 12,700 10,900 9,660 8,760 8,050 7,490 7,030 6,640 5,890
in Cubic Feet (ft3) per Hour (0.60 Specific Gravity; 3.0 in WC Pressure Drop). Contact your gas supplier for BTU/ft3 ratings. Use 1,000 BTU/ft3 for
simplified calculations. This table is recommended for supply pressures of 6 in WC or greater.
Pipe Size
Length (including fittings)
10 ft
(3 m)
20 ft
(6 m)
30 ft
(9 m)
40 ft
(12 m)
50 ft
(15 m)
60 ft
(18 m)
70 ft
(21 m)
80 ft
(24 m)
90 ft
(27 m)
100 ft
(30 m)
125 ft
(38 m)
1/2 in 454 312 250 214 190 172 158 147 138 131 116
3/4 in 949 652 524 448 397 360 331 308 289 273 242
1 in 1,787 1,228 986 844 748 678 624 580 544 514 456
1 1/4 in 3,669 2,522 2,025 1,733 1,536 1,392 1,280 1,191 1,118 1,056 936
1 1/2 in 5,497 3,778 3,034 2,597 2,302 2,085 1,919 1,785 1,675 1,582 1,402
2 in 10,588 7,277 5,844 5,001 4,433 4,016 3,695 3,437 3,225 3,046 2,700
2 1/2 in 16,875 11,598 9,314 7,971 7,065 6,401 5,889 5,479 5,140 4,856 4,303
3 in 29,832 20,503 16,465 14,092 12,489 11,316 10,411 9,685 9,087 8,584 7,608
4 in 43,678 30,020 24,107 20,632 18,286 16,569 15,243 14,181 13,305 12,568 11,139
04/06/2018
19Installing the Water Heater
Maximum Liquefied Propane Delivery Capacity
in Thousands of BTU/H (0.5 in WC Pressure Drop)
Pipe Size
Length (including fittings)
10 ft
(3 m)
20 ft
(6 m)
30 ft
(9 m)
40 ft
(12 m)
50 ft
(15 m)
60 ft
(18 m)
80 ft
(24 m)
100 ft
(30 m)
125 ft
(38 m)
150 ft
(45 m)
175 ft
(53 m)
200 ft
(60 m)
250 ft
(76 m)
1/2 in 291 200 160 137 122 110 101 94 89 84 74 67 62
3/4 in 608 418 336 287 255 231 212 197 185 175 155 140 129
1 in 1,150 787 632 541 480 434 400 372 349 330 292 265 243
1 1/4 in 2,350 1,620 1,300 1,110 985 892 821 763 716 677 600 543 500
1 1/2 in 3,520 2,420 1,940 1,660 1,480 1,340 1,230 1,140 1,070 1,010 899 814 749
2 in 6,790 4,660 3,750 3,210 2,840 2,570 2,370 2,200 2,070 1,950 1,730 1,570 1,440
3.3.2 Measuring the Inlet Gas Pressure
WARNING
The water heater cannot function properly without sufficient inlet gas pressure. Measuring the inlet gas pressure should be performed by
a licensed professional only.
The inlet gas pressure must be maintained between 3.5 in and 10.5 in WC for natural gas and between 8.0 in and 13 in WC for liquefied
propane.
The appliance and its individual shutoff 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). The appliance must be isolated from the gas supply piping system by closing its
individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psi (3.5
kPa).
To measure the inlet gas pressure:
1. Shut off the manual gas valve on the gas supply line.
Gas Valve
Opened Closed
04/06/2018
20 Installing the Water Heater
8. When the water heater reaches its maximum firing rate, check
the inlet gas pressure reading on the manometer. The gas
pressure must fall within the ranges specified on page 19.
3.4 Connecting the Water Supply
The water fittings on the water heater are 3/4 in. If the installation
site only has 1/2 in plumbing throughout, it is not necessary to
upsize the water lines to 3/4 in, if you are installing a single water
heater. When installing multiple water heaters, the number of
water heaters and pipe sizing required will depend on the total
hot water demand. For information about pipe sizing for multiple
water heaters, refer to "4.1.1 Piping Sizes and Considerations" on
page 40.
When connecting the water supply, follow these guidelines:
Do not remove the factory installed recirculation inlet cap unless
a return line is connected to this fitting. Water leakage will occur
if this cap is loose or missing ("A" model only).
Use only pipes, fittings, valves, and other components, such as
solder, that are approved for use in potable water systems.
Tighten the water heater connection valves with care to avoid
damage.
We recommend using unions and manual shut-off valves on the
cold water inlet, DHW outlet, and recirculation water inlet.
Strive to make the hot water piping system as short as possible,
to deliver hot water to the fixtures more quickly.
To conserve water and energy, insulate all water piping—
especially the hot and recirculation water lines. Never cover the
drain or pressure relief valve. If the water heater is installed in
a closed water supply system, such as one having a backflow
preventer in the cold water supply line, means shall be provided
to control thermal expansion. Contact the water supplier or local
plumbing inspector for information about how to control this
situation.
After installing the water heater, clean the inlet water filter that
is located inside the cold water inlet, and then test the water
heater for proper flow and inspect for leaks. Instruct the water
heater owner that the filter must be cleaned periodically to
maintain proper water flow.
2. Open a hot water faucet. The water heater should turn on and
the gas in the gas supply line will be purged.
3. Leave the faucet on until the water heater shuts down due to a
lack of gas supply, and then turn off the hot water faucet.
4. Remove the water heater front cover by loosening the
4 Phillips head screws securing it to the case.
5. Loosen the screw indicated in the figure below and connect a
manometer to the pressure port. Reset the manometer to zero
before use.
Digital pressure
manometer
6. Re-open the manual gas valve and check for leaks.
7. Open multiple fixtures that have high flow rates, such as
bathtub and shower faucets, to ramp the water heater up to its
maximum firing rate.
04/06/2018
21Installing the Water Heater
3.4.1 Using the Water Heater for Combination
Water Heating and Space Heating
When using the water heater for both water (potable) heating and
space heating, follow these guidelines:
Ensure that all piping and components connected the water
heater are suitable for potable water applications.
Do not introduce toxic chemicals, such as boiler treatments, into
the potable water.
On Combi applications, circulators suitable for DHW applications
must be used.
Do not connect the water heater to any heating systems or
components that have been previously used with non-potable
water heaters.
If the system requires varying temperatures for water—for
example, hotter water for space heating than for other uses—
install a mixing valve to temper the water and reduce the
potential for scalding.
Do not use the water heater for space heating only.
Make sure circulator flow rate through the Water Heater does
not exceed 4 GPM.
CAUTION
Do not configure the system for DHW recirculation when it
is configured to run an air handler using the H2Air add-on
controller. DHW recirculation and Navien H2Air configurations
cannot be used at the same time.
3.4.2 Selecting a Recirculation Mode ("A" model
only)
On all “A“ model Navien water heaters, you can choose from
two pre-heating modes: internal recirculation mode or external
recirculation mode. To select a recirculation mode, you must set
the DIP switches on the front panel, and set the position of the
2-way valve inside the water heater. By default, the DIP switches
are set to OFF.
When the optional ComfortFlow recirculation mode is activated,
energy consumption increases because the water heater operates
to maintain the water temperature within the circulation loop. You
can use the Navien Intelligent Preheating feature, set the timer
on the optional Remote Controller, or install the HotButton kit
accessories to reduce energy consumption.
The recirculation feature of the “A“ models has three performance
advantages:
Elimination of any minimum flow rate requirement.
Elimination of any hot/cold/hot stacking—the “cold water
sandwich“ effect.
Quicker hot water delivery to fixtures, which results in less water
wasted.
The following is a typical water piping example for NPE-180A/
210A/ 240A models.
Pressure
Relief ValveUnion
Full port
Gas Valve
Gas Supply
Expansion
Tank
Hot Water Supply
Recirculation Line
Shutoff Valve
Condensate Drain
Cold Water
Supply
[NPE-180A/ 210A/ 240A]
The following is a typical water piping example for NPE-180S/
210S/ 240S models.
Pressure
Relief Valve
Shutoff Valve
Hot Water
Supply
Union
Full port
Gas Valve
Gas Supply
Cold Water
Supply
Condensate Drain
[NPE-150S/ 180S/ 210S/ 240S]
04/06/2018
22 Installing the Water Heater
CAUTION
Do not remove recirculation cap. (Internal Recirculation Mode)
The following diagram shows the internal recirculation flow for
pre-heating:
Internal Recirculation Mode
Primary Heat Exchanger
Secondary Heat Exchanger
Buffer
Tank
Flow
Sensor
Domestic Water
Supply
Hot Water
Supply
Check
Valve
Water
Adjustment
Valve
2-Way
Valve
Open
Circulation
Pump
External Recirculation Mode
To use the external recirculation mode:
1. Connect the water supply to support recirculation. Refer to the
"[NPE-180A/ 210A/ 240A]" diagram on page 21.
2. Set the 2-way valve inside the water heater to “EXT.“
Note When using external recirculation mode with the
built-in pump, observe the following maximum
recirculation pipe lengths including fittings (3/4 in pipe
is recommended):
-1/2 in Copper Pipe- 100 ft (30 m) of equivalent length
-3/4 in Copper Pipe- 500 ft (150 m) of equivalent length
Lengths in excess of these limits will require an
external recirculation pump.
Internal Recirculation Mode
To use the internal recirculation mode:
1. Connect the water supply.
2. Set the 2-way valve inside the water heater to “INT.“
3. Set the front panel DIP switches at the far left (set of ten) to:
1—ON; 2—OFF.
ONON
1 2 3 4 5 6 7 8 9 10
04/06/2018
23Installing the Water Heater
3.4.3 External Pump Wire Connection
An external pump may be connected to the water heater for
recirculation applications. When selecting a circulator, it shall be
sized to maintain a flow of 2-4 GPM through the water heater.
Follow the instructions below when connecting the pump wire
accessory to the PCB.
WARNING
Failure to follow the instructions below may result in property
damage, personal injury or death. To avoid the danger of
electric shock, make sure that the water heater is turned off
before connecting the wire to the PCB.
CAUTION
An external pump cannot be used in an external recirculation
mode application utilizing a by-pass Valve.
<Specications>
Maximum Power Consumption: 150W, 1.5A
Length: 6 ft (183 cm)
When using a pump with larger power requirements than the listed
specication above, a relay should be used to ensure proper operation.
1. Remove the water heater front cover by loosening the
4 Phillips head screws securing it to the case.
3. Set the front panel DIP switches at the far left (set of ten) to:
1—OFF; 2—ON.
1 2 3 4 5 6 7 8 9 10
ON ON
The following diagram shows the external recirculation flow for
pre-heating:
External Recirculation Mode
Primary Heat Exchanger
Secondary Heat Exchanger
Buffer
Tank
Flow
Sensor
Domestic
Water
Supply
Hot
Water
Supply
Recirculation
Water Supply
Check
Valve
Water
Adjustment
Valve
2-Way
Valve
Closed
Circulation
Pump
04/06/2018
24 Installing the Water Heater
6. Remove the plastic insulation from the external pump wire
with a wire stripper before connecting it to the pump.
7. Connect the External Pump Wire to the proper wires from the
pump junction box.
WARNING
To avoid the danger of electric shock, turn on the water heater
ONLY after connecting the wire to the external pump.
8. Locate the 10-switch DIP (SW1) on the front panel and turn on
the proper switches based on the desired recirculation setting
(see Recirculation Dipswitch Settings below).
1 2 3 1 2 4 5 6 7 8 9 10
ON ON
9. Turn on the switch beside the front panel.
2. Locate the power switch on the right side of the front panel
and switch the system off.
Turn the switch off.
3. Remove the 2 screws holding the PCB box in place and remove
the PCB box from the system.
Remove Screws here.
4. Connect the external pump wiring connector to the connector
socket on the PCB (TB1).
TB1
5. Put the PCB box back in its original place and secure it using
the 2 mounting screws.
04/06/2018
25Installing the Water Heater
3.4.4 Connecting a Pressure Relief Valve
WARNING
Improper installation of the pressure relief valve may result
in property damage, personal injury, or death. Follow all
instructions and guidelines when installing the pressure
relief valve. The valve should be installed only by a licensed
professional.
To complete the installation of the water heater, you must install
an approved 3/4 in, maximum 150 PSI pressure relief valve on the
hot water outlet. The water heater has a built-in high temperature
shut off switch, so install a “pressure only“ relief valve. This valve is
not supplied, but is required. The following examples are approved
for use with the water heater:
Wilkins P-1000A (Zurn Industries)
Conbraco 17-402-04
Watts Industries 3L(M7)
Cash Acme FWL-2, 3/4 in
The pressure relief valve should be placed as close to the water
heater as possible. No other valve should be placed between the
pressure relief valve and the water heater.
Pressure
relief valve
Shut-off Valve
Cold waterHot waterGas
10. Put the water heater cover back on and secure it with the
4 screws.
CHG
Condensate
Gas
Domestic
Cold Water
Domestic
Hot Water
Domestic
Recirculation
Return
Recirculation Using External Pump Only
CHG
Condensate
Gas
Domestic
Cold WaterDomestic
Hot Water
Domestic
Recirculation
Return
Recirculation Using Two Pumps
(Navien Internal Pump & External Pump)
04/06/2018
26 Installing the Water Heater
3.5 Connecting the Condensate Drain
The Navien Condensing Water Heater creates condensation when
it operates. This condensation has an acidic pH of 3-5. Follow all
local codes and regulations when disposing of condensate from
the water heater. We recommend draining the condensate into
a laundry tub, as the alkali in laundry detergent will neutralize
the acid in the condensate. However, other suitable waste drain
locations may be used according to local codes.
CAUTION
Do not cap or plug the integrated condensate line. If
prevented from draining, condensate can damage the water
heater.
The condensate line must have a negative slope to drain
properly.
When installing the valve, follow these guidelines:
Ensure that the discharge capacity of the pressure relief valve
is equal to or greater than the maximum pressure rating of the
water heater.
Ensure that the maximum BTU/H rating on the pressure relief
valve is equal to or greater than the maximum input BTU/H
rating of the water heater.
Direct the discharge piping of the pressure relief valve so that
hot water will not splash on anyone or any nearby equipment.
Attach the discharge line to the pressure relief valve and run the
end of the line to within 6-12 in (150-300 mm) of the floor.
Ensure that the discharge line will allow free and complete
drainage without restriction. Do not install a reducing coupling
or other restriction on the discharge line.
If the relief valve discharges periodically, this may be due to
thermal expansion in a closed water supply system. Contact the
water supplier or local plumbing inspector on how to correct
this situation. Do not plug the relief valve.
04/06/2018
27Installing the Water Heater
Before connecting the condensate drain, choose one of the
following disposal options:
To the
laundry tub
Direct to the
external drain
External drain To the laundry tub via
a condensate pump
To the
drain via a
neutralizer
a. From the water heater directly into an external drain.
b. From the water heater, through a neutralizing agent, and then
into an external drain.
Note If you choose this option, the neutralizing agent
must be replaced periodically. Depletion of the
neutralizing agent will vary, based on the usage
rate of the water heater. During the first year of
operation, the neutralizer should be checked every
few months for depletion and replaced as needed.
c. From the water heater into a laundry tub.
Note The bottom of the water heater must be higher
than the top of the laundry tub to use this option.
The condensate line must have a negative slope to
drain properly.
d. From the water heater into a condensate pump, and then into a
laundry tub.
Note A pump can be used when there is a long distance
between the water heater and the laundry tub or
when the bottom of the water heater is lower than
the top of the laundry tub.
To connect the condensate drain:
1. Connect a drain line to the 1/2 in fitting at the bottom of the
water heater.
Use only corrosion-resistant material for the drain line, such as
PVC or CPVC. Do not reduce the size of this fitting or the drain
line to less than 1/2 in.
NPT 1/2 in
2. Place the free end of the drain line into an appropriate drain.
3. If you are using a condensate pump, ensure that the pump
allows for up to 2 GPH of drainage for each water heater in the
system.
If you are not using a condensate pump, ensure that the drain
line is pitched downward at a minimum slope of 1/4 in per foot.
04/06/2018
28 Installing the Water Heater
3.5.1 Condensate Neutralizer Kit
WARNING
To avoid damaging the appliance, the neutralizer inlet and
discharge must be lower than the condensate drain.
Do NOT allow exhaust flue gases to vent through the
neutralizer. Leakage can cause injury or death from carbon
monoxide.
The connection between the appliance and the neutralizer
must be installed to prevent the backflow of condensate
into the appliance.
Do not connect more than one appliance to the neutralizer.
If option 'b' is selected for condensate disposal, the Navien
condensate neutralizer kit is recommended. The condensate from
the appliance flows through the neutralizing media and increases
the pH of the condensate. An increased pH prevents corrosion of
the installation's drainage system and the public sewer system.
Installation
The inlet has a center connection port and the outlet has an
offset connection.
Install the neutralizer on the wall or the floor and secure it using
the brackets supplied with the kit.
If the neutralizer is installed horizontally, rotate the neutralizer to
position the outlet at the highest point (Figure 1).
If the neutralizer is mounted vertically, ensure that the outlet is
higher than the inlet (Figure 2).
Ensure that the condensate runs freely to the drain.
Ensure all connections are made to prevent the backflow of
condensate. Use corrosion resistant piping and secure all piping
to prevent movement.
Note Do not install condensate piping in areas where the
temperature drops below freezing point. Protect piping
in high pedestrian areas from damage and vibration.
For increased safety when the condensate drain blocks, install
a Y-fitting. Connect the Y-fitting as shown in the installation
diagram and ensure that the condensate runs freely to the drain.
Ensure that the discharge connection is accessible. Access to
the discharge connection is required for maintenance and pH
testing.
If there is insufficient gradient for drainage, install a drainage
pump designed for boiler and water heater condensate removal.
Optional
overflow bypass
Figure 1. Horizontal installation
Optional
overflow bypass
Figure 2. Vertical installation
Maintenance
Periodically monitor the level of media in the neutralizer and test
the pH level at the outlet. We recommend an annual pH test using
recognized test strips or an electronic pH meter to obtain precise
measurements. Replace the neutralizing media when the pH drops
below the minimum level required by the local water authority. If
the pH level is not specified, replace the neutralizing media when
the pH is below 6.0. For replacement media, contact your local
Navien distributor.
04/06/2018
29Installing the Water Heater
3.6 Venting the Water Heater
WARNING
Improper venting of the water heater can result in excessive
levels of carbon monoxide, which can lead to severe personal
injury or death. This water heater must be vented in
accordance with the “Venting of Equipment“ section of
the latest edition of the ANSI Z223.1/NFPA 54 Natural Fuel
Gas Code in the USA and/or the “Venting systems and air
supply for water heaters“ section of the latest version of
the CAN/CGA B149.1 Natural Gas and Propane Installation
Code in Canada, as well as all applicable local building
codes and regulations. Follow all instructions and guidelines
when venting the water heater. Venting should be performed
only by a licensed professional.
The water heater must be properly vented to ensure a constant
supply of clean intake air and to ensure that exhaust air is properly
removed from living areas. When venting the water heater, follow
these guidelines:
Do not install the water heater in areas with contaminated air
(containing a high level of dust, sawdust, sand, flour, aerosols,
or any other such airborne contaminants), as contaminants
can cause operational problems. The warranty does not cover
damage caused by contaminants in the installation area. If you
must install the water heater in an area with contaminated air,
use direct venting to supply air from outside the building. We
recommend regular filter cleaning and maintenance in these
areas.
For best results, keep the venting system as short and straight as
possible.
Locate the water heater as close as possible to the vent
termination.
Do not connect the water heater vent to a vent for any other gas
water heater or vent stack.
For horizontal runs, slope the horizontal section upward toward
the vent termination at a rate of 1/4 in per foot (2 % slope).
Create an airtight seal at each joint in the exhaust and intake air
pipes from the water heater collar to the vent termination.
To avoid moisture and frost build-up and to maintain clearances
to openings on adjacent homes, 45° elbows, 90° elbows, or tees
may be attached to the end of the termination vent pipe to
direct the exhaust plumes away from buildings, as long as the
total allowable vent lengths, maximum number of elbows, and
distances to air intake restrictions are observed.
Do not store hazardous or flammable substances near the vent
termination.
If this water heater will be installed in areas where snow is
known to accumulate, protect the vent termination from
blockage.
Ensure that the vent termination is at least 12 in (305 mm) above
the highest anticipated snow line, or as required by local codes,
whichever is greater.
Support the vent pipe with hangers at regular intervals or as
required by local codes.
Exhaust and intake air pipes must be supported at least every 4
ft (1.2 m).
The vent for this appliance shall not terminate over public
walkways; or near soffit vents or crawl space vents or where
condensate or vapor could create a nuisance or hazard or cause
property damage; or where condensate or vapor could cause
damage or could be detrimental to the operation of regulators,
relief valves, or other equipment.
3.6.1 Selecting a Vent Type
All water heaters are prepared at the factory to be direct vent
(sealed combustion) water heaters that draw all of their required
combustion air directly from outside the building. Navien
recommends direct air vent installations whenever possible to
avoid back drafting cold air through the water heater. If you cannot
use a direct vent, ensure that an ample supply of make-up air is
available in the installation location.
Navien also recommends installing a new vent system with this
appliance. If reusing an existing vent system, thoroughly inspect
it for punctures, cracks, or blockages prior to connecting it to the
water heater.
Direct Venting
The water heater uses 2 in or 3 in diameter exhaust and 2 in or 3
in diameter intake air ducts. To ensure the draw of air directly from
and exhaust of air directly to the outside of the building, create an
airtight seal from the water heater collar to the vent termination.
Intake materials can be made of ABS, PVC, CPVC, PP, galvanized
steel, corrugated aluminum or any other such materials. If you
use a corrugated material, ensure that there is not inadvertent
crimping of, or damage to, the intake air pipe.
When using direct venting, maintain the following venting
clearances, as required by ANSI Z21.10.3 and the National Fuel
Gas Code, ANSI Z223.1/NFPA 54, and CAN/CGA B149.1 Natural
Gas and Propane Installation Code:
04/06/2018
30 Installing the Water Heater
Ref Description Canadian Direct Vent Installations
1 US Direct Vent Installations2
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 15
ft above the meter/regulator
assembly
*
I Clearance to service regulator vent outlet 3 ft (91 cm) *
J Clearance to nonmechanical 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) † *
M Clearance under veranda, porch deck, or balcony 12 in (30 cm) ‡ *
1 In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code
2 In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier.
04/06/2018
31Installing the Water Heater
Non-Direct Venting (Single Pipe)
If, at any time, the installation location could experience negative
pressure, there is a possibility of back drafting cold air through
the water heater’s heat exchanger. This situation could lead to
the freezing of the heat exchanger and malfunction of the water
heater.
However, building codes in most jurisdictions disallow negative
pressures in residences. In a home with a well-balanced air supply,
the heat exchanger should not be in danger of freezing. Because
the cause of back drafting is not considered a manufacturing
problem, any freezing damage which occurs from back drafting
will not be covered by the Navien warranty. If there is any question
about the possibility of back drafting in the installation location,
use a direct venting system for the water heater.
When installed in a manufactured home (mobile home), all
combustion air must be supplied from the outdoors as described
on page 28.
When using non-direct venting, maintain non-direct vent
clearances shown on page 32 as required by ANSI Z21.10.3 and
the National Fuel Gas Code, ANSI Z223.1/NFPA 54, and CAN/
CSA B149.1 Natural Gas And Propane Installation Code.
To use non-direct venting for the water heater:
1. Insert the termination end cap into the intake air duct. Do not
glue the end cap, to allow for easy removal and cleaning of the
cap.
Vent termination cap 2 in
Coupling 2 in
Pipe 2 in
2. Provide two openings to allow for circulation of combustion air
as specified by ANSI Z223.1/NFPA 54 or CAN/CGA B-149.1:
Maximum
Input
(BTU/H)
Outdoor
make up air is
provided,
a minimum
free area of
1 in2, per 4,000
BTU/H
Indoor make
up air is
provided,
a minimum
free area of
1 in2 per 1,000
BTU/H
NPE-150S 120,000
30 in2
10 in (W) x 3 in
(H) or 6 in
round
120 in2
11 in (W) x
11 in (H)
NPE-180A
NPE-180S 150,000
40 in2
10 in (W) x 4 in
(H) or 7 in
round
150 in2
12 1/4 in (W) x
12 1/4 in (H)
NPE-210A
NPE-210S 180,000
45 in2
10 in (W) x 5 in
(H) or 8 in
round
180 in2
13 1/4 in (W) x
13 1/4 in (H)
NPE-240A
NPE-240S 199,900
50 in2
10 in (W) x 5 in
(H) or 8 in
round
199 in2
14 1/4 in (W) x
14 1/4 in (H)
04/06/2018
32 Installing the Water Heater
Ref Description
Canadian Non-Direct Vent
Installations1
US Non-Direct Vent
Installations2
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)
48 in (120 cm) below or to side
of opening; 12 in (30 cm) 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 * *
H Clearance to each side of center line extended above
meter/regulator assembly
36 in (91 cm) within a height
15 ft (4.57 m) above the meter/
regulator assembly
*
I Clearance to service regulator vent outlet 36 in (91 cm) *
J Clearance to nonmechanical air supply inlet to building or
the combustion air inlet to any other appliance 36 in (91 cm)
48 in (120 cm) below or to side
of opening; 12 in (30 cm) above
opening
K Clearance to a mechanical air supply inlet 6 ft (1.83 m)
36 in (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) † *
M Clearance under veranda, porch deck, or balcony 12 in (30 cm) ‡ *
1 In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code
2 In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code
† A vent shall not terminate directly above a sidewalk or paved driveway that is located between two single family dwellings and serves both dwellings.
‡ Permitted only if veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier.
04/06/2018
33Installing the Water Heater
3.6.2 Selecting Vent Pipe Materials
Venting requirements differ in the US and Canada. Consult
the following chart or the most recent edition of ANSI Z223.1/
NFPA 54 or CAN/CGA B149.1, as well as all applicable local codes
and regulations when selecting vent pipe materials. Do not
use cellular core PVC (ASTM F891), cellular core CPVC, Radel®
(polyphenolsulfone) for the exhaust vent.
Locale Recommended Vent Materials
USA
PVC Schedule 40 (Solid Core)
CPVC Schedule 40 or 80 (Solid Core)
Approved Polypropylene*
Canada**
Type BH Special Gas Vent Class IIA (PVC)
Type BH Special Gas Vent Class IIB (CPVC)
Type BH Special Gas Vent Class IIC
(Polypropylene)
* Approved polypropylene systems include:
Duravent Polypro (Single Wall): 2PPS-xxx (2 in), 3PPS-xxx (3 in)
Centrotherm Innoflue SW: ISxx02xx (2 in), ISxx03xx (3 in)
Centrotherm InnoFlue Flex: IFVL02XXX (2 in)
Refer to the manufacturer’s literature for detailed information.
** For installation in Canada, field-supplied plastic vent piping must comply
with CAN/CGA B149.1 (latest edition) and be certified to the Standard
For Type BH Gas Venting Systems, ULC-S636. Components of this listed
system must not be interchanged with other vent systems or unlisted
pipes or fittings. All plastic components and specified primers and glues
of the certified vent system must be from a single system manufacturer
and must not be intermixed with another system manufacturer’s parts.
The supplied vent connector and vent termination are certified as part of
the water heater.
CAUTION
This water heater has a built-in control to limit the exhaust
temperature to 149°F (65°C). As a result, the Navien water
heater can be vented with Schedule 40 PVC. If the incoming
(or recirculation return) water temperature does not exceed
150°F (66°C), the exhaust temperature will not exceed
149 °F (65 °C).
However, if you set the water heater at a temperature
above 150 °F (66 °C) and you are also incorporating either
an external recirculation loop or a combination heating
system, the exhaust temperature can exceed 149 °F (65 °C).
In that case, you must use Schedule 40 or 80 CPVC or
Approved Polypropylene in the USA or Type BH Special
Gas Vent Class IIB (CPVC) or Class IC (Polypropylene) that
conforms to ULC-S636 in Canada.
In systems with 2 in vents, if the exhaust temperature
exceeds 149 °F (65 °C), CPVC pipe (field supplied) must
be used for the first 3 ft of equivalent pipe length. For
systems with 3 in vents, if the exhaust temperature exceeds
149 °F (65 °C), CPVC pipe (field supplied) must be used for
the first 5 in of equivalent pipe length.
Example of a Centrotherm InnoFlue® Flex (2 in) Vent System*
* VERTICAL installations only. Horizontal termination is not allowed.
The following table lists the model types approved for use with
the Centrotherm InnoFlue® Flex 2 in vent pipes, and the maximum
length of the vent system.
Model type NPE-150S NPE-180A/S NPE-210A/S
Max. length 50 ft 50 ft 50 ft
Use of flexible vent pipes is not approved for any other models
that are not listed in the table.
All flexible vent pipe must be installed VERTICALLY through the
roof. No horizontal terminations are permitted.
Use a 2 in snap fit coupler or the InnoFlue® Single Wall
Residential vent pipes to connect the InnoFlue® Flex 2 in vent
pipes to the exhaust.
After installation, ensure that the vent system is tighltly sealed at
the joints.
All installation using the flexible vent materials must be in
INDIRECT VENTING only.
Refer to the manufacturer’s literature for detailed information.
04/06/2018
34 Installing the Water Heater
3.6.3 Measuring Vent Length
The maximum vent length when using 2 in exhaust ducts is 60 ft.
The maximum vent length when using 3 in vent ducts is 150 ft.
The intake duct length can be of equal length to the exhaust duct
length. Both maximum lengths are reduced by the number of
elbows used, as shown in the following table:
Vent Size Maximum
Length
Maximum
# of Elbows Equivalent Lengths
2 in 60 ft
(18 m)6
Reduce the maximum
vent length
accordingly for each
elbow used:
Each 90° elbow
equates to 8 linear
ft (2.4 m) of vent
Each 45° elbow
equates to 4 linear
ft (1.2 m) of vent
3 in 150 ft
(45 m)8
Reduce the maximum
vent length
accordingly for each
elbow used:
Each 90° elbow
equates to 5 linear
ft (1.5 m) of vent
Each 45° elbow
equates to 3 linear
ft (0.9 m) of vent
Note The Maximum Length does not include any elbows.
If using a concentric termination as shown on
pages 34-36, count this as 5 linear ft (1.5 m) of
vent.
The maximum vent lengths at high altitudes are
the same as shown in the table above.
3.6.4 Terminating the Vent
Before installing the water heater, determine what type of
vent termination is appropriate for the installation location
and situation. Examples in this section describe typical venting
configurations, but they do not include all possible options.
Along with 2 in and 3 in PVC Concentric Terminations shown on
pages 35-36, the following terminations can also be used:
IPEX Low Profile Termination Kits:
2 in Low Profile Vent Kit #196984
3 in Low Profile Vent Kit #196985
Duravent PolyPro Horizontal Concentric Termination Kit
2 in x 4 in Concentric Vent Kit #2PPS-HK
3 in x 5 in Concentric Vent Kit #3PPS-HK
Refer to the vent manufacturer's instructions for detailed
installation procedures.
Indoor Water Heater Installation Venting Examples
The following are some possible indoor venting options:
2 in or 3 in Two-pipe Sidewall Venting
04/06/2018
35Installing the Water Heater12 in (300 mm) min.12 in (300 mm) min.
Exhaust Gas
Exhaust Gas
Interior View
Exterior View
Intake Air
Intake Air
Do not vertically
stack terminations on
sidewalls.
Non-concentric Sidewall Venting – Air is drawn from a different
location at a minimum of 12 in (300 mm) from the exhaust
termination. Try to minimize the length of the intake air pipe
with this venting.
12 in (300 mm) above the highest anticipated snow level,
or as required by local codes, whichever is greater
* 12 in (300 mm) min. * Concentric Sidewall Venting
1 in (25 mm) min.
Combustion Air
Combustion Air
Maintain 12 in (300
mm) min. clearance
above highest
anticipated snow
level or grade.
Vent Vent
CAUTION
Refer to the figures below for the orientation of vent if the
IPEX low profile vent kit if it is used for termination.
04/06/2018
36 Installing the Water Heater
2 in or 3 in Two-pipe Vertical Venting – Intake and exhaust pipes
do not have to terminate in the same area.12 in (300 mm) min.12 in (300 mm) min.36 in (900 mm) min.
12 in (300 mm) min.
From any obstruction
(above, below, left, or
right)
Exhaust Gas
Intake Air
Concentric Roof Venting
Maintain 12 in (300 mm) min.
(18 in (450 mm) min. for Canada)
clearance above highest
anticipated snow level. Maximum
of 24 in (600 mm) above roof
Vent
Vent
Combustion Air
Combustion Air
Outdoor Installation
Outdoor installation should only be considered in mild climates.
Freezing temperatures or contaminated air can damage the
water heater. When installing the water heater outdoors, maintain
clearances from building openings, as described in the “Non-Direct
Venting (Single Pipe)“ section on page 31. Outdoor installation
areas should be in an open, unroofed area and should allow for the
following minimum clearances from the water heater:
Side
Side
Front
Bottom
Back
Intake Air
Exhaust Gas
Top
Bottom 12 in
Back 0.5 in
Sides 3 in
Front 24 in
Top 36 in
When installing a water heater outdoors, follow these guidelines:
The Navien Outdoor Vent Kit must be used to ensure proper
operation of the water heater.
Ensure that there is plenty of clearance around the air intake and
that it is adequately protected to prevent any debris, liquids, or
flammable gases from entering the air intake.
If the water heater is installed under an eave, maintain a
clearance of 3 ft or more from the eave to the top of the water
heater vent terminals.
04/06/2018
37Installing the Water Heater
3.7 Connecting the Power Supply
WARNING
Improperly connecting the power supply can result in electrical
shock and electrocution. Follow all applicable electrical codes
of the local authority having jurisdiction. In the absence of
such requirements, follow the latest edition of the National
Electrical Code (NFPA 70) in the USA or the latest edition
of CSA C22.1 Canadian Electrical Code Part 1 in Canada.
Connecting the power supply should be performed only by a
licensed professional.
When connecting the power supply, follow these guidelines:
Do not connect the electric supply until all plumbing and gas
piping is complete and the water heater has been filled with
water.
Do not connect the water heater to a 220-240 V AC power
supply. Doing so will damage the water heater and void the
warranty.
All water heaters come with a factory-installed, 3-pronged
(grounded) plug. The water heater can be plugged into any
grounded electrical outlet nearby, as it requires only 2-4 Amps.
It is not necessary to run a dedicated electrical line to the water
heater.
If local codes require the water heater to be wired directly,
remove and discard the factory-installed plug. Install a power
switch between the breaker and the water heater to facilitate
end-user maintenance and servicing. Connect the water heater
to a 110-120 V AC at 60 Hz with a maximum of 2 A (4 A if an
external pump is connected) rating electrical supply.
The water heater must be electrically grounded. If using the
power plug, ensure that the electrical outlet you connect the
water heater to is properly grounded. If wiring the water heater
directly to a power supply, do not attach the ground wire to
either the gas or the water piping as plastic pipe or dielectric
unions may prevent proper grounding.
We recommend using a surge protector to protect the water
heater from power surges.
If there is a power failure in cold weather areas, the freeze
prevention system in the water heater will not operate and may
result in freezing of the heat exchanger. In cold weather areas
where power failures are common, you must completely drain
the water heater to prevent damage if the power will be off
for any extended period of time. A battery back-up (available
at most computer retailers) may be used to supply hot water
during periods of power outages. Damage caused by freezing is
not covered under warranty.
3.8 Setting the DIP Switches
The water heater has two DIP switch locations: on the main circuit
board (PCB) and on the front panel. Each location has two sets
of DIP switches that control the functionality of the water heater.
Set the DIP switches appropriately, based on the installation
environment.
3.8.1 Circuit Board DIP Switches
The two sets of DIP switches on the circuit board configure the
water heater’s model settings. These configurations are set at the
factory and should not be changed.
3.8.2 Setting the Front Panel DIP Switches
The two sets of DIP switches on the front panel configure the
water heater’s pump & recirculation, display, well pump, storage
tank & solar system, lime alarm, high altitude, cascade venting
and gas type settings. Some of these configurations are set at the
factory and should not be changed. The following tables describe
the functions of the DIP switches and their settings:
1 2 3 4 5 6 7 8 9 10
ON ON
04/06/2018
38 Installing the Water Heater
10-switch Panel:
Switch Function Setting Remark
1-3
Recirculation Mode-
Internal Navien
Pump ("A" model
only)
No Recirculation 1-OFF; 2-OFF; 3-OFF * Intelligent Preheating:
Learns the user's hot water
usage patterns and starts
preheating prior to an
anticipated draw.
Preheating starts when
remote controller is not
connected.
When remote controller is
connected, preheating starts
and operates based on the
timer.
Set the timer on the remote
controller to use hot water
at the time of your choice.
Intelligent preheating does
not function in Cascade
Mode (Preheating OFF).
Freeze protection is still
available with preheating
OFF.
**External Pump:
These settings are to be used
when an external pump is
wired to the water heater.
***Lime Alarm:
Displays a "760" error when
the set time period has been
reached to indicate a flush or
service is necessary.
****High Altitude
Above 2,000 ft (610 m), the
water heater will de-rate by
4% for each 1,000 ft (305 m) of
altitude gain.
Internal Recirculation 1-ON; 2-OFF; 3-OFF
External Recirculation 1-OFF; 2-ON; 3-OFF
Intelligent Preheating* 1-ON; 2-ON; 3-OFF
Recirculation Mode-
External Pump
Connected**
External Pump Only 1-OFF; 2-OFF; 3-ON
Internal Recirculation ("A" model only) 1-ON; 2-OFF; 3-ON
External Recirculation ("A" model only) 1-OFF; 2-ON; 3-ON
Intelligent Preheating* 1-ON; 2-ON; 3-ON
4 Display Temperature
Unit
Celsius 4-ON
Fahrenheit 4-OFF
5 Well Pump
Well Pump Operation 5-ON
Do Not Use Well Pump 5-OFF
6 DHW Storage Tank/
Solar System
Storage Tank/Solar System Operation 6-ON
Do Not Use Storage Tank/Solar System 6-OFF
7 & 8 Lime Alarm***
6 Months Alert 7-ON; 8-OFF
12 Months Alert 7-OFF; 8-ON
24 Months Alert 7-ON; 8-ON
9 & 10 High Altitude ****
0–1,999 ft (0–609 m) 9-OFF, 10-OFF
2,000–5,399 ft (610–1,645 m) 9-ON, 10-OFF
5,400–7,699 ft (1,646–2,346 m) 9-OFF, 10-ON
7,700–10,100 ft (2,347–3,078 m) 9-ON, 10-ON
Note This water heater may be installed at elevations up to 10,100 ft (3,078 m) for use with Natural Gas and 4,500 ft (1,370 m) for use
with Propane. To use the water heater at a specific altitude, the DIP switches should be set as described above.
CAUTION
Do not configure the system for DHW recirculation when it is configured to run an air handler using the H2Air controller. DHW
recirculation and Navien H2Air configurations cannot be used at the same time.
2-switch Panel:
Switch Function Setting
1 Cascade Vent
Common Vent 1-OFF
Individual Vent 1-ON
2 Gas Type
Natural Gas OFF
Propane Gas ON
04/06/2018
39Installing a Cascade System
When installing a cascade system, carefully consider the design of the system and the features of the installation location. Follow all local
codes and regulations, as well as all guidelines for installing the water heater. The following sections describe additional considerations that
are specific to installing cascade systems. Read them carefully before designing or installing the system.
4.1 Connecting Water Supplies
Several options are available for plumbing a cascade system of water heaters. The options shown here are only examples. The setup you
choose will vary based on the installation location, local building codes, and other factors. Follow all applicable regulations when installing a
cascade system.
You can connect up to 16 water heaters to meet high-volume hot water demands. Some possible connection options include the following:
Recirculation via Internal Pumps (“A” model only):
Communication
Cable
DHW Supply Line
Recirculation Line
Cold Water Supply Line
Gas Supply Line
Union
Ball Valve
Check Valve
Faucet
Expansion Tank
Pressure Relief Valve
[NPE-180A/ 210A/ 240A]
Note The recommended minimum recirculation flow rate for each water heater is 2 GPM. Depending on the number of water heaters
and the diameter of the recirculation line, it may not be necessary to connect all water heaters to the recirculation line. If this is
the case, set the unconnected water heaters to internal recirculation mode. The master water heater must always be connected
to the recirculation line and set to external recirculation mode.
Multiple NPE-S Units:
Communication
Cable
DHW Supply Line Cold Water Supply Line
Gas Supply Line
Union
Ball Valve
Check Valve
Faucet
Expansion Tank
Pressure Relief Valve
[NPE-150S/ 180S/ 210S/ 240S]
4. Installing a Cascade System
04/06/2018
40 Installing a Cascade System
4.2 Connecting the Communication Cables
Up to 16 water heaters can be connected with Navien Ready-Link
communication cables. Select one of the water heaters in the
cascade system as the master water heater, and then connect the
other water heaters to it as slaves. Before making any connections,
ensure that the power is turned off to all water heaters.
Connect the Ready-Link cables to the J6 ports on the right side of
the front panel:
4.2.1 Configuring the Communication Settings
After connecting the Ready-Link communication cables, restore
power to the water heater and turn on all water heaters using the
Power button.
To configure the communication settings:
1. On the master water heater, press and hold the Diagnostic
and Up(+) buttons for more than 5 seconds. “MA.00” will
appear on the display to confirm that this water heater is set as
the master.
4.1.1 Piping Sizes and Considerations
When plumbing a cascade system, consider the following pipe
diameters and flow rates. Note that flow rates above 6.6 ft/s may
cause pipe erosion. These specifications may vary depending on
installation conditions.
Qty ΔT=54ºF
Flow rate (GPM)
Water
Velocity (ft/s)
Pipe
Diameter (mm/in)
1 7.19 4.78 20A
3/4 in
2 14.38 5.61 25A 1 in
3 21.57 5.54 30A 1 1/4 in
4 28.77 5.21 40A 1 1/2 in
5 35.96 6.53 40A 1 1/2 in
6 43.15 4.49 50A 2 in
7 50.34 5.24 50A 2 in
8 57.5 6.00 50A 2 in
9 64.72 4.39 65A 2 1/2 in
10 71.92 4.75 65A 2 1/2 in
11 79.11 5.34 65A 2 1/2 in
12 86.30 5.84 65A 2 1/2 in
13 93.49 6.33 65A 2 1/2 in
14 100.68 6.79 65A 2 1/2 in
15 107.87 5.11 80A 3 in
16 115.07 5.44 80A 3 in
17 122.26 5.81 80A 3 in
18 129.45 6.14 80A 3 in
19 136.64 6.46 80A 3 in
20 143.83 6.83 80A 3 in
21 151.02 4.06 100A 4 in
22 158.21 4.25 100A 4 in
23 165.41 4.45 100A 4 in
24 172.60 4.65 100A 4 in
25 179.79 4.85 100A 4 in
26 186.98 5.05 100A 4 in
27 194.17 5.24 100A 4 in
28 201.36 5.44 100A 4 in
29 208.56 5.61 100A 4 in
30 215.75 5.81 100A 4 in
Note The table above is based on model NPE-240A.
04/06/2018
41Installing a Cascade System
2. On the slave water heater, press and hold the Diagnostic and
Down(-) buttons for more than 2 seconds. “SL.01” will appear
on the display to confirm that this water heater is set as a slave.
3. Repeat step 2 to configure the rest of the slave water heaters in
the system.
4. On the master water heater, press and hold the Diagnostic
and Up(+) buttons for more than 5 seconds. All the display
screens on the configured water heaters will return to the
temperature display.
Note To add additional slaves at a later time, repeat step
2.
To cancel the cascade communication setup, on the
master water heater, press and hold the Diagnostic
and Reset buttons for more than 5 seconds. The
water heaters will revert to independent operation.
Repeat steps 1-4 to reassign the master water
heater.
04/06/2018
42 Installing a Common Vent System
About the Common Vent System
The Navien Common Vent System* provides an easy way to install
the vent system for up to 8 Navien NPE water heater units. By
sharing the main intake and exhaust vent pipes, effective system
venting is available with less venting materials and minimal
number of penetrations on the walls or roofing.
* Independently tested and approved by CSA
Read all safety messages and carefully follow the guidelines in this
manual when installing a common vent system for the Navien NPE
water heater units.
WARNING
Improper venting of the water heater units can result in
excessive levels of carbon monoxide, which can lead to severe
personal injury or death. The water heater units must be
vented in accordance with the “Venting of Equipment“
section of the latest edition of the ANSI Z223.1/NFPA 54
Natural Fuel Gas Code in the USA, as well as all applicable
local building codes and regulations. Follow all instructions
and guidelines when venting the water heater units. Venting
should be performed only by a licensed professional.
Guidelines for a Common Vent System
CAUTION
To ensure the correct operation of the common vent system,
-a cascade communication cable MUST be installed
between all units in the common vent system by the
installer.
-backflow vent dampers must be installed in the exhaust
duct of each water heater unit.
-use direct vent systems (with separate intake and
exhaust lines).
This section covers the installation of a common vent system
for NPE water heaters only.
To ensure the safe and correct installation of the common vent
system, carefully follow the instructions and guidelines.
Check to see if all contents are included in the package (refer to
the “Included Items” on page 46).
A maximum of 8 NPE water heaters may be connected to one
common vent system. In a cascade system that has more than 8
water heaters, use 2 common vent systems, or consult Navien.
Use only the PVC cements specified in this manual when
connecting pipes, joints, or elbows.
Position the water heater units as close as possible to the vent
termination.
Install a new vent system with this appliance. If an existing vent
system is reused, thoroughly inspect it for punctures, cracks, or
blockages prior to connecting it to the water heater unit.
The common vent system covered in this manual is approved
only for direct venting applications.
Horizontal vent pipe runs must be supported every 4 feet (1.2 m)
(minimum). All vertical vent pipe runs must be supported every
6 feet (1.8 m) (minimum). Support the vent pipe with hangers at
regular intervals or as required by local codes.
Install a backflow damper for each water heater unit. Use only
the damper specified in this manual.
To avoid moisture and frost build-up and to maintain clearances
to openings on adjacent homes, 45° elbows, 90° elbows, or tees
may be attached to the end of the termination vent pipe to
direct the exhaust plumes away from buildings, as long as the
total allowable vent lengths, maximum number of elbows, and
distances to air intake restrictions are observed.
If the water heater units will be installed in areas where snow
is known to accumulate, protect the vent termination from
blockage. Provide a minimum of 1 foot (30 cm) clearance from
the bottom of the exhaust of the expected snow accumulation
level. Snow removal may be necessary to maintain clearance.
Ensure that the vent termination is at least 12 in (305 mm) above
ground, 12 in (305 mm) above the highest anticipated snow
level, or as required by local codes, whichever is greater.
Support the vent pipe with hangers at regular intervals or as
required by local codes.
The vent for this appliance shall not terminate over public
walkways; or near soffit vents or crawl space vents or where
condensate or vapor could create a nuisance or hazard or cause
property damage; or where condensate or vapor could cause
damage or could be detrimental to the operation of regulators,
relief valves, or other equipment.
5. Installing a Common Vent System
04/06/2018
43Installing a Common Vent System
Clearances Between Multiple Units
Ensure that the installed water heaters satisfy all installation
clearances provided in the manual. It is essential that there is
sufficient clearance space for the common vent system to work
properly.
The water heater units can be mounted either IN-LINE or BACK TO
BACK.
Navien Modular Configuration with Rack System
In-line Setup Back to Back Setup
<Clearance Chart for Common Vent Applications>
Bottom 12” (300 mm)
Back 0.5” (13 mm)
Side 3” (76 mm)
Front 24” (609 mm)
Top 36” (914 mm)
General and Local Standards Information
When installing and operating the common vent system, the
following standards and regulations must be complied with and
adhered to:
Local codes or, in the absence of local codes, the National Fuel
Gas Code, ANSI Z223.1/NFPA 54.
Appliance manufacturer’s Installation Instructions.
Regulations on the supervision of construction.
Statutory provisions.
Installation and service work must be carried out by licensed
professionals only.
04/06/2018
44 Installing a Common Vent System
Risk Guidelines
Ensure that all common vent system components are
manufactured and installed in accordance with valid standards,
regulations, and safety engineering rules.
To avoid risk, the common vent system must be installed and
used only for the original purpose described in this manual.
Defects or damages found in a common vent system must be
addressed and repaired immediately.
For roof or chimney modifications, refer to the relevant industrial
safety regulations.
Works on roofs and facades are dangerous. Comply with all
relevant regulations.
Cutting and Assembling Common Vent System
Components
Standard tools are suitable for the cutting and assembly of
common vent system components. Follow the guidelines listed
below when working with the components.
When cutting vent components, ensure that the cuts are
straight. Chamfer and deburr all edges before installing the
components.
All vent joints must be fully tightened.
Before operating the system, ensure that the Installed vent
system is clean and free of debris.
Ensure that the vent system is rigidly supported according to the
manual’s instructions.
Selecting Vent Pipe Materials
Consult the following chart or the most recent edition of
ANSI Z223.1/NFPA 54, as well as all applicable local codes and
regulations when selecting vent pipe materials. This appliance
should be vented with materials approved for Category IV gas
appliances. Do not use cellular core PVC (ASTM F891), cellular core
CPVC, or Radel® (polyphenolsulfone) for the exhaust vent. See
below for recommended vent materials.
Locale Recommended Vent Materials
USA
PVC Schedule 40 (Solid Core)
CPVC Schedule 40 or 80 (Solid Core)
Vent Pipe Pitch and Supports
For horizontal runs, slope the horizontal section upward toward
the vent termination at a rate of 1/4” per foot (2% slope).
Connecting Pipes with Cement
CAUTION
The vapors from primers and solvent cements can make you
dizzy and are dangerous to your health. Ensure that the work
area is well ventilated, or wear an approved organic vapour
respirator when working with primers and solvent cements.
To connect the vent pipes using cement:
1. Spread an even layer of solvent cement on the inside of the
pipe fitting and the outside of the pipe.
2. Align the pipe with the pipe fitting and twist the pipe a quarter
turn as you insert it into the fitting. Twisting the pipe spreads
the solvent cement evenly to ensure a solid joint.
3. Hold the pipe and pipe fitting together for about 15 seconds
until the cement sets.
04/06/2018
45Installing a Common Vent System
Note Use approved solvent type cement for the proper
vent materials.
Use solvent type cement only.
Check the date of manufacture before using the
cement. Ensure that cement was not manufactured
more than 2 years prior to using it.
Ensure that the inside of the pipe fitting and the
outside of the pipe, where cement will be applied,
is clean.
Apply an even layer of cement over all mating
surfaces.
Use solvent cement in room temperatures higher
than 32˭ (0˫).
Installing vent pipe with cement in cold ambient
temperatures can result in longer cure times.
DANGER
Be careful not to apply force or impact to pipes after making
connections. An impact may break the bond and harmful gas
might leak inside the room.
Determining the Length of a Common Vent System
Follow the instructions listed below to determine the length of a
common vent.
1. Add the BTU/H input ratings for each unit in the cascading
system to determine the total BTU/H rating.
2. Determine the total length (L) of the common vent, which
consists of the horizontal width (W) and the vertical height (H):
Total length (L) = W + H.
Exhaust
Intake
D
WH
Common Vent Length Table [Total Length (L) =
W + H]
Vent Length for NPE Water Heater Units
Required Load
(Total BTU/H)
Model Total Length (ft)
NPE-240A/S D=3” D=4” D=6” D=8”
399,800 2 60 106 200
599,700 3 40 71 160
799,600 4 30 53 120
999,500 5 96 150
1,199,400 6 80 142
1,393,300 7 68 121
1,599,200 8 60 106
Note Every 90° elbow used is equivalent to 8 linear feet (2.4
m) of vent length.
Example of a Typical Installation (Direct Vent Only)
The following illustration depicts an example of a common vent
system installed for a cascade system of 8 Navien NPE heater units.
Note The illustration is intended for reference purposes
only.
04/06/2018
46 Installing a Common Vent System
Navien Backflow Damper (Back-draft
Damper)
The Navien backflow damper prevents backflow (back-draft) at the
exhaust vent while the water heater unit operates.
By closing the exhaust vent as soon as the combustion cycle ends,
the Navien backflow damper retains heat in the system for longer
periods. This improves the system’s thermal efficiency.
Note When using a common vent in a cascade system,
backflow devices are required to prevent exhaust
from entering the building.
Included Items
Backflow Damper
Installation Manual
Condensing Water Heater
Common Vent
S
y
s
tem Installation M
a
n
u
a
l For NPE Series Wa
t
e
r
H
e
a
t
e
rs
Certified to ANSI Z21.10.3 – CSA 4.3. (Only for U.S. installations)
Keep this manual for future reference whenever maintenance or service is
required.
-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 instructions.
● If you cannot reach your gas supplier, call the fire department.
-Installation and service must be performed by a qualified installer, service agency or the gas supplier.
-This entire manual must be left for the consumer. The consumer must read and refer to this manual for proper operation and
maintenance of the common vent system. -The installation must conform with local codes or, in the absence of local codes, the National Fuel Gas Code,
ANSI Z223.1/NFPA 54. -When applicable, the installation must conform with the Manufactured Home Construction and Safety
Standard, Title 24 CFR, Part 3280, Mobile Homes.
WARNING If the information in these instructions is not followed exactly, a fire or explosion may result, causing property damage, personal
injury, or death.
Ready-Link
communication
cable
Screw (4 ea)
Specifications
5.9” (150 mm)
1.1” (28 mm)
Part Name Backflow Damper
Part No.30014367A
Material PP (Polypropylene)
Maintenance Port
Navien Backflow Damper has a maintenance port to allow you to
easily inspect the operating condition of the damper plate.
Damper plate
Maintenance port
Maintenance port
Gasket
Maintenance port cover
Fix screw
Refer to < Maintenance> for detailed inspection procedures.
Navien Backflow Damper (Back-draft Damper)
Note When using a common vent in a cascade system,
backflow devices are required to prevent exhaust
from entering the building.
04/06/2018
47Installing a Common Vent System
Starting the Common Vent System
Backflow Damper Assembly
Follow the instructions below to assemble the backflow damper
on the NPE water heater units:
1. Remove the screws from the exhaust vent adapter.
2. Detach the exhaust vent adapter.
3. Connect the backflow damper to the exhaust duct of the water
heater unit.
4. Tighten the four mounting screws to secure the backflow
damper in place. The screws (x 4) are supplied with the
backflow damper.
04/06/2018
48 Installing a Common Vent System
Connecting the Pipe to the Damper
1. Insert 2” vent pipe to the backflow damper to start the vent
run.
2. Completely slide the vent pipe ends into the transition fitting.
Tighten the clamp with a screwdriver to properly seal the joint.
Assembling the T Joint
1. Connect an 8”-to-2” reducer to the 8” tee. Apply solvent
cement to the mating surfaces.
Apply
Cement
8”-to-2” reducer
Note Multiple reducers can be used to allow proper
connection of 2" vent pipe to the common vent
system.
2. Assemble the tee joint assembly (8”-to-2” reducer + tee joint)
to the vent pipe. Apply solvent cement to the mating surfaces.
Apply
Cement
04/06/2018
49Installing a Common Vent System
Connecting and Terminating the Vent Pipe
Refer to the following example to install the common vent system. The installation area should be measured to ensure that sufficient space is
available to install the water heater units and the common vent system. Ensure that the common vent system is installed near the water heater
units while satisfying all clearance requirements that are specified in this manual as well as the Installation Manuals supplied with the water
heater units.
Connecting the Main Pipe Runs to T Joint
After connecting the tee joint to the 8”-to-2” reducer, connect the main trunk pipe to each side of the tee. Each trunk pipe is connected to the
other tee joint. Refer to <”Connecting Pipes with Cement”> on page 44 for more information.
Installing the System Termination
End caps, pipe elbows or tee joints can be used at the open ends of the intake and exhaust vent pipes. Refer to the following installation
examples that depict how the parts are fitted at the end of the common vent system piping.
Note The illustration is intended for reference purposes only.
04/06/2018
50 Installing a Common Vent System
Setting Up the Common Vent System
DANGER
Incorrect DIP switch settings may lead to severe personal
injury, death, or property damage.
Refer to the following figures when setting DIP switches.
1 2 3 4 5 6 7 8 9 10
ON ON
Switch
(2–Switch DIP)Function Setting
1 Cascade Vent
Settings
Common Vent 1-OFF
Individual Vent 1-ON
1 2 3 4 5 6 7 8 9 10
ON ON
Switch
(10–Switch DIP)Function Setting
9 & 10 High Altitude
Settings
0 – 1,999 ft
(0 – 609 m)
9-OFF,
10-OFF
2,000 – 4,500 ft
(610 – 1,372 m)
9-ON,
10-OFF
Note The NPE series water heaters may be installed at
elevations up to 4,500 ft (1,372 m) for use with Natural
Gas and Propane. To use the water heaters in the
common vent system at a specific altitude, the DIP
switches should be set as described above.
04/06/2018
51Installing a Common Vent System
Common Vent Termination Clearances
Direct Vent Application – Vertical Installation
12" (30 cm) min.
12" (30cm) min.
36" (91cm) min.
Exhaust
Intake
End
Cap
Venting Intake and Exhaust to Different Locations
Exhaust
Intake
End
Cap
Direct Vent Application – Horizontal Installation
Intake
Maximum
length 20’
(6 m)
Minimum
length 36”
(91 m)
Exhaust
Note The illustration is intended for reference purposes
only.
Direct the exhaust away from any building
openings.
During cold weather situations, the temperature of
the exhaust will be much warmer than the ambient
air. Therefore, you will see water vapor being
produced at the termination.
04/06/2018
52 Installing a Common Vent System
Exhaust Vent Termination Clearances (For Direct Vent)
Ref Description Canadian Direct Vent Installations1 U.S. Direct Vent Installations2
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 12 in (30 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 feet (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
15 ft above the meter/regulator
assembly
*
I Clearance to service regulator vent outlet 3 ft (91 cm) *
J
Clearance to nonmechanical 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 within10
ft (3 m) horizontally
L Clearance above paved sidewalk or paved
driveway located on public property 7 ft (2.13 m)† *
M Clearance under veranda, porch deck, or balcony 12 in (30 cm)‡ *
1 In accordance with the current CSA B149.1 Natural Gas and Propane Installation Code
2 In accordance with the current ANSI Z223.1 / NFPA 54 National Fuel Gas Code
† A vent shall not terminate directly above a sidewalk or a paved driveway that is located between two single family dwellings, that serves both dwellings.
‡ Permitted only if the veranda, porch, deck, or balcony is fully open on a minimum of two sides beneath the floor.
* Clearance in accordance with local installation codes and the requirements of the gas supplier.
04/06/2018
53Installing a Common Vent System
Maintenance
Periodically check the damper condition inside the backflow
damper through the maintenance port to ensure optimal
performance of the system. Follow the instructions to check the
damper condition and replace the backflow damper if necessary.
3. Remove the screw that fixes the maintenance port cover to
the backflow damper, and then remove the gasket and the
maintenance port cover.
Maintenance port
Gasket
Maintenance port cover
Fix screw
4. Through the maintenance port, check the operating condition
of the damper plate inside the backflow damper.
Damper plate is
CLOSED.
Damper plate is
OPEN
5. Reinstall the gasket and maintenance port cover, and then fix
them with a set screw.
6. Visually inspect the maintenance port to ensure that the
gasket is properly installed between the maintenance port and
the maintenance port cover.
WARNING
Ensure that the gasket is properly installed under the
maintenance port cover, after checking the operating
condition of the damper plate through the maintenance port.
Harmful exhaust gas may leak if the gasket is not installed, or if
it is not installed properly.
Gasket
04/06/2018
54 Appendixes
6.1 Gas Conversion
This water heater is configured for Natural Gas from the factory. If
conversion to Propane Gas is required, the conversion kit supplied
with the water heater must be used.
WARNING
This conversion kit shall be installed by a qualified service
agency* in accordance with Navien’s instructions and all
applicable codes and requirements of the authority having
jurisdiction. The information in these instructions must be
followed to minimize the risk of fire or explosion or to prevent
property damage, personal injury or death. The qualified
service agency is responsible for the proper installation of
this kit. The installation is not proper and complete until the
operation of the converted appliance is checked as specified in
the manufacturer’s instructions supplied with the kit.
* A qualified service agency is any individual, firm, corporation or company
which either in person or through a representative is engaged in and
is responsible for the connection, utilization, repair or servicing of gas
utilization equipment or accessories; who is experienced in such work,
familiar with all precautions required, and has complied with all of the
requirements of the authority having jurisdiction.
In Canada: The conversion shall be carried out in accordance with
the requirements of the provincial authorities having jurisdiction
and in accordance with the requirements of the CAN‐B149.1 and
CAN1‐B149.2 Installation Code.
Tools Required:
Phillips Screwdriver
Flathead Screwdriver
5/32 in or 4 mm Allen Wrench
Combustion Analyzer or Dual Port Manometer
Gas Leak Detector
Included Items:
Gas Orifice (refer to below table)
Water Heater NG LP
NPE-150S Ø6.30 Ø5.10
Water Heater
NG LP
1STAGE 2STAGE 1STAGE 2STAGE
NPE-180A
NPE-180S Ø4.80 Ø5.95 Ø3.80 Ø4.70
NPE-210A
NPE-210S Ø6.10 Ø6.30 Ø4.50 Ø4.80
Water Heater
NG LP
1STAGE 2STAGE 1STAGE 2STAGE
NPE-240A
NPE-240S Ø6.10 Ø6.30 Ø4.50 Ø4.80
Table 1. Orifice size
Gas Pressure and Conversion Kit Number Labels
Procedure:
1. Turn off both gas and water supply to the water heater.
2. Using a Phillips hand screwdriver, remove 4 screws (2 from the
top and 2 from the bottom) of the front cover assembly to gain
access to the internal components. See Figure 1 for illustration
of the front cover on the unit.
Figure 1. NPE Series Front cover
Gas Valve
Gas Inlet
Pipe
Figure 2. NPE Series Internal Components
6. Appendixes
04/06/2018
55Appendixes
6. Once the Gas Orifice is exposed, remove the two screws that
hold the part in place. Remove the Gas Orifice from its housing
and prepare the new Gas Orifice for the LP conversion for
installation.
Remove two (2)
screws here
Figure 4. Access to Gas Orifice in Fan Assembly
WARNING
DO NOT adjust or attempt to measure gas valve outlet
pressure. The gas valve is factory-set for the correct outlet
pressure. This setting is suitable for natural gas and propane,
requiring no field adjustment.
Attempting to alter or measure the gas valve outlet pressure
could result in damage to the valve, causing potential severe
personal injury, death or substantial property damage.
Navien water heaters are shipped ready to fire natural gas
ONLY.
3. Once the front cover is removed, place it in a safe location to
prevent accidental damage. With the internal components
exposed, locate the gas inlet pipe and the Gas Valve near the
left side of the unit which are highlighted in Figure 2.
4. Use a Phillips screwdriver to remove the two screws at Location
A - the connection below the Gas Valve where it connects
to the pipe. See Figure 3 for reference. Once the screws are
removed, carefully separate the pipe from the Gas Valve.
5. Once the gas inlet pipe is detached from the Gas Valve, find
Location B - the connection above the Gas Valve where it is
attached to the Fan Motor Assembly. Carefully remove the four
screws by hand using a Phillips screwdriver and pull the Gas
Valve away from the Fan Assembly to access the Gas Orifice.
Location B:
Remove four
(4) screws here
Location A:
Remove two (2)
screws here
Figure 3. Detaching Gas Valve from
Gas Inlet Pipe and Fan Motor Assembly
04/06/2018
56 Appendixes
DANGER
See Figure 5. Inspect the O-ring between the gas valve and
gas valve inlet adapter whenever they are disassembled.
The O-ring must be in good condition and must be installed.
Failure to comply will cause a gas leak, resulting in severe
personal injury or death.
LP
NPE-150S NPE-180A/ 210A/ 240A/ 180S/ 210S/ 240S
NG
Figure 6. Orifice identification
7. Remove the Gas Orifice, ensure that the packing is properly
seated inside the port, and then install the new Gas Orifice for
use with LP gas. Ensure that the Orifice is properly seated on
the packing inside the port before proceeding to the next step.
Packings Packing
8. Replace the gas inlet pipe to its original position and use all
screws to secure all connections.
Note Do not overtighten as this may damage or crack
the components.
9. Set the Front Panel Dip switch according to the gas type.
WARNING
Be sure to turn off the power before changing the DIP switch
setting.
O-ring
Gas Orifice
<NPE-150S>
O-ring
Gas Orifice
Packing
<NPE-180A/ 210A/ 240A/ 180S/ 210S/ 240S>
Figure 5. Exploded view of Gas assembly
Packing
04/06/2018
57Appendixes
1 2
NG
1 2
LP
1 2 3 1 2 4 5 6 7 8 9 10
ON ON
DANGER
When conversion is required, be sure to set the Front Panel
DIP switches according to the supply gas type.
Failure to properly set the DIP switches could cause carbon
monoxide poisoning, resulting in severe personal injury or
death.
10. Turn on the gas and water supply to the water heater.
11. Measure and adjust the gas/air ratio.
Option 1. Using Combustion Analyzer (recommended)
a. Loosen the screw, rotate the plate and remove the gasket
to access the emissions monitoring port as shown in
Figure 7.
b. Insert the analyzer into the port (Figure 7).
Figure 7
Water
Heater Fuel
High fire Low fire
%CO2 %CO2
NPE-150S
NG 8.9 9.5
LP 10.2 10.8
NPE-180A
NPE-180S
NG 8.9 9.5
LP 10.2 10.8
NPE-210A
NPE-210S
NG 8.9 9.5
LP 10.2 10.8
NPE-240A
NPE-240S
NG 8.9 9.5
LP 10.2 10.8
Table 2. CO2 and CO value
(CO2 values must be within 0.5% of the values listed.)
c. Fully open several hot water fixtures and set the
water heater to operate at 1-stage MIN mode (refer to
page 59). Measure the CO2 value at low fire.
If the CO2 value is not within 0.5% of the value listed in
Table 2, the gas valve set screw will need to be adjusted.
If adjustment is necessary, locate the set screw as shown
in Figure 8. Using a 5/32 in or 4 mm Allen wrench, turn
the set screw no more than 1/4 turn clockwise to raise or
counterclockwise to lower the CO2 value.
Figure 8. Set Screw Location
Note The set screw is located behind the screw-on
cover. This must be removed first.
04/06/2018
58 Appendixes
d. Fully open several hot water fixtures and set the water
heater to operate at 2-stage MAX mode (refer to
page 59). Measure the CO2 value at high fire.
If the CO2 values do not match Table 2 at high fire, do not
adjust the gas valve. Check for the proper Gas Orifice.
DANGER
Improper gas valve settings can cause severe personal injury,
death or substantial property damage.
Option 2. Using Digital Manometer
a. Open the offset pressure port by loosening the screw two
turns as shown in Figure 9.
Figure 9
b. Connect a manometer to the offset pressure port. For dual
port manometers, use the positive pressure side.
Model Kit Part No. Gas Type Offset
NPE-150S
NAC-N6 LP -0.03 in ± 0.01 in
NAC-L6 NG -0.04 in ± 0.01 in
NPE-180A
NPE-180S
NAC-01 LP -0.03 in ± 0.01 in
NAC-100 NG -0.04 in ± 0.01 in
NPE-210A
NPE-210S
NAC-02 LP -0.02 in ± 0.01 in
NAC-200 NG -0.04 in ± 0.01 in
NPE-240A
NPE-240S
NAC-03 LP -0.02 in ± 0.01 in
NAC-300 NG -0.04 in ± 0.01 in
Table 3. Offset value for low fire
c. Fully open a hot water fixture and set the water heater to
operate at 1-stage MIN mode (refer to page 59). Measure
the offset value at low fire and compare it to the values in
Table 3. If the offset value is out of range, the gas valve set
screw will need to be adjusted.
If adjustment is necessary, locate the set screw as shown
in Figure 10. Using a 5/32 in or 4 mm Allen wrench, turn
the set screw no more than 1/4 turn clockwise to raise or
counterclockwise to lower the offset value.
Figure 10
Note The set screw is located behind the screw-on
cover. This must be removed first.
d. At high fire, do not check the offset value and never adjust
the gas valve.
DANGER
Improper gas valve settings can cause severe personal injury,
death or substantial property damage.
12. Once the CO2 or offset values have been confirmed, apply the
included conversion stickers to show that the appliance has
been converted to propane gas. Place this labels adjacent to
the rating plate as shown in Figure 11.
Orifice Size / Injecteur:
Min. 4.5 mm to Max. 4.8 mm
This unit has been
converted to Propane fuel
Cet appareil a ete converti au Propane
Manifold Gas Pressure /
Pression à la tubulure d’alimentation:
Min. -0.02 to Max. -0.66 inches WC
BTU Input / Debit calorifique:
Max. 180,000 - Min. 19,900 BTUh
Conversion Kit No.: NAC-02
Inlet Gas Pressure / Pression d'entrée du gaz:
Min. 8.0 to Max. 13.0 inches
with Kit No. ________________________
This water heater was converted on
(name and address of organization making
this conversion, who accepts responsibility
for the correctness of this conversion)
______/______/______ to ____________ gas
by _________________________________
_________________________________
Figure 11. Proper Placement of Gas Conversion Labels
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59Appendixes
6.1.1 Setting the Operation Mode
1. Using the Front Panel, press and hold the Diagnostics Button
for over 5 seconds until “1.TST” is displayed.
2. Press the + (Up) button once to change the display to “2.OPR”.
3. Press the Information Button once to acess the Operation
Mode menu.
4. Press the + (Up) button once to set the water heater to
opearate at 1-stage MIN (“MIN.1”).
5. To set the water heater to operate at 2-stage MAX (1-stage
MAX for NPE-150S), press the + (Up) button 3 times or until
“MAX.2 (MAX.1 for NPE-150S)” is displayed.
6. To exit the Operation Mode and return the water heater to
normal operation, press the Reset button twice.
Diagnostics
Information
Reset
04/06/2018
60 Appendixes
6.2 Technical Data
Pressure Drop Curve
2TGUUWTG.QUU
RUK 9CVGT(NQY
)2/
[NPE-240A/ 240S]
2TGUUWTG.QUU
RUK 9CVGT(NQY
)2/
[NPE-210A/ 210S]
2TGUUWTG.QUU
RUK 9CVGT(NQY
)2/
[NPE-180A/ 180S]
2TGUUWTG.QUU
RUK 9CVGT(NQY
)2/
[NPE-150S]04/06/2018
61Appendixes
Outlet Flow Data
(NQY
)2/ ů66GORGTCVWTG4KUG
ș
[NPE-240A]
(NQY
)2/ ů66GORGTCVWTG4KUG
ș
[NPE-210A]
(NQY
)2/ ů66GORGTCVWTG4KUG
ș
[NPE-180A]
Note At altitudes above 2,000 ft (610m), the outlet flow will be reduced by 4% for each 1,000 ft (305 m) of altitude gain.
04/06/2018
62 Appendixes
Outlet Flow Data
(NQY
)2/ ů66GORGTCVWTG4KUG
ș
[NPE-240S](NQY
)2/ ů66GORGTCVWTG4KUG
ș
[NPE-210S](NQY
)2/ ů66GORGTCVWTG4KUG
ș
[NPE-180S]
(NQY
)2/ ů66GORGTCVWTG4KUG
ș
[NPE-150S]
Note At altitudes above 2,000 ft (610m), the outlet flow will be reduced by 4% for each 1,000 ft (305 m) of altitude gain.
04/06/2018
63Appendixes
6.3 Wiring Diagram
CON5CON6CON7CON8CON10CON1CON4CON2CON3CON11TB1BKBKFront PanelBKBKBKBKBKBKBKBKBKBKBKBKHigh Limit S/WAPSRWBKAir Pressure SensorFlow SensorRWBKBBInlet1 ThermistorBBBBOutlet2 ThermistorBBBBInlet2 ThermistorBBBBOutlet1 ThermistorBBBBExhaust ThermistorBBWater Adjustment ValveFeedbackMWAVBRORBYRWBKPumpYWMDual VenturiWBRBIGSparkElectrodeFlame RodBRBBKFMFan MotorROWYBKMGVMain Gas ValveWYRBKNeutral(W)Hot(BK)Ground(GY)GYPower CordWFuse(5A)Power SwitchGYGYGroundPumpYWGroundExternalColor CodeBORWYBKBRGY: Blue: Orange: Red: White: Yellow: Black: Brown: Green/YellowABCDEFGHKJLIIf any of the original wires assupplied with the water heater must bereplaced, they must be replacedwith their equivalent.Optional[NPE-180A/ 210A/ 240A]
04/06/2018
64 Appendixes Power SwitchCON5CON6CON7CON8CON10CON1CON4CON2CON3CON11TB1BKBKBKBKBKBKBKBKBKBKBKBKBKBKHigh Limit S/WAPSRWBKAir Pressure SensorFlow SensorRWBKBBInlet1 ThermistorBBBBOutlet2 ThermistorBBBBInlet2 ThermistorBBBBOutlet1 ThermistorBBBBExhaust ThermistorBBWater Adjustment ValveFeedbackMWAVBRORBYRWBKMDual VenturiWBRBIGSparkElectrodeFlame RodBRBBKFMFan MotorROWYBKMGVMain Gas ValveWYRBKNeutral(W)Hot(BK)Ground (GY)GYPower CordWFuse (5A)GYGYGroundPumpYWGroundExternalColor CodeBORWYBKBRGY: Blue: Orange: Red: White: Yellow: Black: Brown: Green/YellowABCDEFGHKJLIOptionalIf any of the original wires assupplied with the water heater mustbe replaced, they must be replacedwith their equivalent.CON9Mixing ValveFeedbackMMIXBRORBYRWBKFreeze Protect S/WAnti-Frost HeaterMFront Panel* NPE-180S/ 210S/ 240S only[NPE-150S/180S/ 210S/ 240S]
04/06/2018
65Appendixes
6.4 Ladder Diagram
HOT NEUTRAL
VENTURI
Relay 1
Relay 2
Relay 3
Relay 4
IGNITER
PUMP
Speed Control
Primary
MCU 1 MCU 2
DC24V
Flow Sensor
APS
DC12V
FAN
Water Adjust
Valve
Flow Control
DC15V
UART
Communication
Interface
Ready Link
Interface Ready Link
Fan
Hall Sensor
Outlet
Thermistor 2
Inlet
Thermistor 1
Inlet
Thermistor 2
Outlet
Thermistor 1
Exhaust
Thermistor
EXT_PUMP
FRONT
PANEL
Communication
Interface
Relay 3
Relay 2
Relay 4
Driving Circuit
MGV1
MGV2
Relay 1
FSA Power
Switch
Flame Rod
200V
PWM
EMI
FILTER
DC5V
H.T.L
WD-PSS
SMPSPrimary
Secondary 3.15A[NPE-180A/ 210A/ 240A]
04/06/2018
66 Appendixes
HOT NEUTRAL
VENTURI
Relay 1
Relay 2
Relay 3
Relay 4
IGNITER
PUMP
Speed Control
Primary
MCU 1 MCU 2
DC24V
Flow Sensor
APS
DC12V
FAN
Water Adjust
Valve
DC15V
UART
Communication
Interface
Ready Link
Interface Ready Link
Fan
Hall Sensor
Outlet
Thermistor 2
Inlet
Thermistor 1
Inlet
Thermistor 2
Outlet
Thermistor 1
Exhaust
Thermistor
EXT_PUMP
FRONT
PANEL
Communication
Interface
Relay 3
Relay 2
Relay 4
Driving Circuit
MGV1
MGV2
Relay 1
FSA Power
Switch
Flame Rod
200V
PWM
EMI
FILTER
DC5V
H.T.L
WD-PSS
SMPSPrimary
Secondary 3.15AWater Mixing
Valve
Flow ControlFlow Control* NPE-180S/ 210S/ 240S only
[NPE-150S/ 180S/ 210S/ 240S]
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67Appendixes
6.5 Component Assembly Diagrams and Parts Lists
6.5.1 Case Assembly
12
7
13
89
10
18
2
1
3
4
6
5
17
16
15
14
11
04/06/2018
68 Appendixes
# Description Part # Remark
1 Intake Air Duct Assembly 30008662B
2 Intake Air Filter 20007667A
3 Case
20019078C NPE-180A/210A/240A
20026559B NPE-150S/180S/210S/240S
4 Air Pressure Sensor 30010346A
5 Panel Bracket 20018388A
6Cover
30008678B NPE-180A/210A/240A
30011694A NPE-150S/180S/210S/240S
7 Case Lower Bracket 20007643B
8 PCB 30011969A
9 Power Switch 30009482A
10 Front Panel 30008333A
11 Case Bracket 20007609A
12 Exhaust Pipe Assembly 30008673A
13 Rubber Ring 20025127A
14 Saddle 20013508A NPE-150S/180S/210S/240S
15 Saddle Bracket 1 20026170A NPE-150S/180S/210S/240S
16 Freeze Protector Sensor 30002587A NPE-150S/180S/210S/240S
17 Freeze Protector Sensor Bracket 20007671A NPE-150S/180S/210S/240S
18 Saddle Bracket 2 20026172A NPE-150S/180S/210S/240S
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69Appendixes
6.5.2 Burner Assembly(NPE-180A/ 210A/ 240A)
7
6 18
13
3
7-1
10
9
12
8 14
1112
4-1
4
17-1
11-1
12
12
1
15
14
5
2
17
6-1
6-1
6-1
6-1
6-1
12
6
12
6-1
04/06/2018
70 Appendixes
# Description Part # Remark
1 Heat Exchanger Assembly
30009189A NPE-180A
30010812A NPE-210A/240A
2 Fan Packing 20022744A
3 Fan Bracket(F) 20022095A
4 Flow Sensor Assembly 30008571A
4-1 Thermistor 30008366A
5 Fan Braket(R) 20022096A
6 Cold Inlet Pipe
30009166D NPE-180A
30010805D NPE-210A/240A
6-1 O-Ring (Φ17.5x2.7t) 20006947A
7 WPA-A (Clip) 20018344A
7-1 Thermistor 30008366A
8 WPA-B 20018343A
9 H-Ex Middle Pipe
30009126A NPE-180A
30010803C NPE-210A/240A
10 Hot Water Outlet Pipe
30009145A NPE-180A
30008442A NPE-210A/240A
11 WPA-A (Screw) 30008569A
11-1 Thermistor 30008366A
12 Fastner 20017726A
13 Ignition Transformer 30010455A
14 Fastner 20007853A
15 Ignitor 30008591A
16 Damper 30008825A
17 Buffer Tank Inlet Adapter 20018346A
17-1 O-Ring (P16) 30009478A
18 Thermistor 30009478A
04/06/2018
71Appendixes
6.5.3 Burner Assembly(NPE-150S/180S/ 210S/ 240S)
104
105
3
2
13
12 1
18 17
10 15
23
9
10
10
14
6
20
9
10
7
10
9
24
16
21 1017
15
10
6
9
10
25
19
22
8
9
10
11
04/06/2018
72 Appendixes
# Description Part # Remark
1 Ignition Transformer 30010455A
2 Fan Bracket (R ) 20022096A
3 Thermistor 30009478A Exhaust
4 Heat Exchanger Assembly
30214351A NPE-150S
30011706A NPE-180S
30011705A NPE-210S/240S
5 Ignitor
30214183A NPE-150S
30012226A NPE-180S/210S/240S
6 Packing (Φ26.5x2.4t) 20006868A
7 Heat Exchanger Outlet Pipe
30014326A NPE-150S
30011519A NPE-180S
30011515A NPE-210S/240S
8 WPA-C (Screw) 20026780A
9 Fastner 20017726A
10 O-Ring (Φ17.5x2.7t) 20006947A
11 Cold Inlet Pipe
30214751A NPE-150S
30011521A NPE-180S
30011665A NPE-210S/240S
12 Fan Damper 30008825A
13 Fan Packing 20022744A
14 Fan Bracket (F) 20022095A
15 Backup Ring 20018744B
16 High Limit Switch 30002577A
17 Fastner 20007853A
18 WPA-A (Clip) 20018344A
19 Thermistor 30008366A Water
20 WPA-B
20033191A NPE-150S
20018343A NPE-180S/210S/240S
21 H-Ex Middle Pipe
30014330A NPE-150S
30009126A NPE-180S
30010803C NPE-210S/240S
22 WPA-A (Screw) 30008569A
23 Mixing Pipe
30014327A NPE-150S
30011518A NPE-180S
30011514A NPE-210S/240S
24 WPA-T 20025960A
25 Hot Water Outlet Pipe
30014328A NPE-150S
30011520A NPE-180S
30011516A NPE-210S/240S
04/06/2018
73Appendixes
6.5.4 Waterway Assembly(NPE-180A/210A/240A)
1
15
16
3
10
9-2
9-3
11
7
4-1
3-5
9-1
3-2
3-1
5
2
12
2-4
2-3
2-1 4-2
2-5
2-2
12
13
14
9-3
7-1
12-1
12-2 12-3
12-4
12-5
11
69
11
17
3-3
3-4
4-3
11
4
5
2-4
8-1
8
# Description Part # Remark
1 Buffer Tank 30010953A
2 Hot Water Outlet Pipe Assembly 30008338A
2-1 Pipe Adapter 30008349A
2-2 O-RING (P20) 20017212A
2-3 Thermistor (Red) 30008366A
2-4 O-RING (P16) 20006947A
2-5 Pipe Clip 20007733A
3 Return Pipe Assembly 30008350A
3-1 Pipe adapter 30008349A
04/06/2018
74 Appendixes
# Description Part # Remark
3-2 O-RING (P20) 20017212A
3-3 O-RING (P19) 20017211A
3-4 Water Filter 30008351A
3-5 Pipe Clip 20007733A
4 Circulation Pump 30010346A
4-1 Pump Air Seperator 30006831A
4-2 Drain Plug 30003550B
4-3 O-RING (P18) 20006947A
5 Fastner 20017726A
6 Water adjustment valve (WAV) 30008245A
7 WAV Outlet Pipe Assembly 30008624B
7-1 O-Ring (P16) 20011438A
8 Syphon 30009756B
8-1 Syphon Hose 20018429A
9 Pump Outlet Pipe Assembly 30008361A
9-1 Check Valve 30008360A
9-2 Pipe Clip 20017722A
9-3 O-Ring (P16) 20017210A
10 Return Pipe clip 20017767A
11 Fastner 20007859A
12 Cold Water Inlet Pipe Assembly 30009437A
12-1 Water Filter 30008351A
12-2 O-RING (P19) 20017211A
12-3 Pipe adapter 30008349A
12-4 O-RING (P20) 20017212A
12-5 Pipe Clip 20007733A
13 O-RING (P29) 20017923A
14 Buffer Tank adapter 20017757A
15 Buffer tank pipe A 20017759A
16 Buffer tank pipe B 20017760A
17 Fastner 20017724A
04/06/2018
75Appendixes
6.5.5 Waterway Assembly(NPE-180S/ 210S/ 240S)
10
15
2
12
6
6 13
8
14
11
10
11
8
9
11
8
12
11
17
16
8
6
7
6
5
4
3
2
1
6
10
15
2
12
6
6 13
8
14
11
10
11
8
9
11
8
12
11
17
16
8
6
7
6
5
4
3
2
1
6
04/06/2018
76 Appendixes
# Description Part # Remark
1 Bracket 20026489A
2 Thermistor 30008366A
3 Water Filter 30008171A
4 Cold Water Inlet Adapter 30011597A
5 O-Ring (P15) 20017217A
6 Fastner 20007859A
7 Flow Sensor 30011534A
8 O-Ring (P16) 20017210A
9 Flow Sensor Outlet Adapter 20025959A
10 Outlet Adapter 20025961A
11 Fastner 20017726A
12 Water Adjustment Valve (WAV) 30011532A
13 Inlet Adapter 20025962A
14 O-Ring (P18) 20006947A
15 How Water Outlet Adapter 30011601A
16 Siphon 30009756B
17 Siphon Hose 20018429A
04/06/2018
77Appendixes
6.5.6 Fan(Gas) Assembly
98
95
910
94
97
12
911
99
910
93
915
913 914
96
91
92
[NPE-180S/180A/210S/210A/240S/240A]
6
12
11
7
16
13
3
10
2
10
10
5
14
8
4
[NPE-150S]04/06/2018
78 Appendixes
# Description Part # Remark
1 Gas Adapter
30009921A NPE-180S/180A
30009922A NPE-210S/210A/240S/240A
2 Gas Pipe
30014329A NPE-150S
30013323A NPE180S/180A
30008431A NPE-210S/210A/240S/240A
3 Gas Connector 20018430A
4 Gas Valve 30008429A
5 Gas Inlet Adapter 20023809A
6 Fan Assembly
30015421A NPE-150S
30008834A NPE-180S/180A/210S/210A/240S/240A
7
Single Venturi 30014688A NPE-150S
Dual Venturi
30009219A NPE-180S/180A
30008909A NPE-210S/210A/240S/240A
8 Silence
30015322A NPE-150S
20019142A NPE-180S/180A
20023829A NPE-210S/210A/240S/240A
9 Silence Adapter
20023861A NPE-180S/180A
20019141A NPE-210S/210A/240S/240A
10 O-Ring (P20) 20006934A
11 O-Ring (G70) 20007001A NPE-150S
O-Ring (G75) 20018079A NPE-180S/180A/210S/210A/240S/240A
12 Fan Packing 20022744A
13 Gas Orifice
20029420B NPE-150S (NG)
20034178A NPE-150S (LP)
20024159A NPE-180S/180A (NG)
20024190A NPE-180S/180A (LP)
20019144A NPE-210S/210A/240S/240A (NG)
20024189A NPE-210S/210A/240S/240A (LP)
14 Venturi Packing
20030893A NPE-150S
20022660A NPE-180S/180A/210S/210A/240S/240A
15 O-Ring (P34) 20019090A NPE-180S/180A/210S/210A/240S/240A
16 Silence Packing 20032129A NPE-150S
04/06/2018
79Appendixes
6.6 Installation Check list
After installing the water heater, review the following checklist. You should be able to answer “Yes” to all of the items in the checklist. If not,
review the appropriate sections to complete the installation. To troubleshoot any operational problems refer to “Troubleshooting” in the
Owner’s Manual.
If you have additional questions or need assistance with installation, contact Technical Support at 1-800-519-8794 or 1-949-420-0420, or refer
to the technical support section of Navien’s website (www.navien.com).
Installing the Water Heater Yes No
Have you maintained the required clearances from building openings and intake air vents?
Have you minimized the distance between the water heater and the vent termination?
Have you minimized the distance between the water heater and major fixtures?
Have you maintained the proper service and maintenance clearances?
Is the make-up air supply sufficient for proper operation?
Is the make-up air supply free from dust, dirt, corrosive elements, and flammable vapors?
Is the water heater and vent piping clear of combustible materials, including clothing, cleaning materials, and rags?
Connecting the Gas Supply Yes No
Does the gas supply match the type specified on the water heater’s rating plate?
Is the gas line at least 1/2 in or 3/4 in ID (Inner Diameter)?
Is the gas supply line sufficient in length and diameter to deliver the required BTUs?
Have you measured the pressure of the gas supply line?
Is the gas supply pressure within the recommended ranges specified in this manual?
Is the gas supply line equipped with a manual full port valve?
Have you tested the gas line pressure and all fittings for leaks?
Has the gas company inspected the installation, if required?
Connecting the Water Supply Yes No
Is the water supply pressure sufficient (greater than 40 PSI)?
Have you installed shut off valves on the inlet and outlet to facilitate cleaning of the inlet water filter?
Have you bled the air out at each fixture?
Have you checked each fixture to ensure hot water is being supplied?
Have you cleaned the inlet water filter?
If you installed a recirculation line, have you insulated the hot water pipes and the return line?
Connecting a Pressure Relief Valve Yes No
Have you installed an approved pressure relief valve on the water heater?
Does the rating of the pressure relief valve match or exceed the maximum BTU rating of the water heater?
Is the pressure relief valve at least 3/4 in in diameter?
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80 Appendixes
Connecting a Pressure Relief Valve Yes No
Have you installed the pressure relief valve on the hot water outlet pipe near the water heater?
Have you installed a discharge drain tube from the pressure relief valve to within 6–12 in (150–300 mm) of the floor?
Connecting the Condensate Drain Yes No
Have you installed a condensate drain line from the water heater to a drain or laundry tub?
Venting the Water Heater Yes No
Have you vented the water heater with 2 in or 3 in PVC, CPVC, Polypropylene, Type BH Special Gas Vent (ULC-S636) for
Category IV Water Heaters (Canada), or in accordance with all local codes and the guidelines in this manual?
Have you ensured that PVC cellular core pipe has not been used as venting for the water heater?
Is the vent sloped upward toward the vent termination at a rate of 1/4 in per foot (2 % grade)?
Are all vent runs properly supported?
Have you properly supported the vent termination?
Have you properly sealed all air intake and exhaust joints, from the flue collar to the to the vent termination?
Have you installed end caps on the exhaust and intake pipes?
Have you checked the venting for leaks?
Is the vent termination at least 12 in (300 mm) above the exterior grade?
Have you ensured that sufficient make-up air is available?
Is the total vent length within the maximum vent length restriction?
Connecting the Power Supply Yes No
Is the supplied voltage 110-120 V AC?
Is the water heater plugged into a properly grounded outlet?
If you have made a direct power supply connection, have you installed a power switch to facilitate end-user
maintenance?
Have you checked the polarity of the electrical connection?
Is the system properly set up for cascade operation (master and slave water heaters), if applicable?
Setting the DIP Switches Yes No
Have you verified the positions of all DIP switches on the circuit board?
Have you verified the positions of all DIP switches on the front panel?
Operating the Water Heater Yes No
Have you shown the owner how to clean the inlet water filter?
Have you given the Installation Manual and Owner’s Manual to the owner for future reference?
Have you shown the owner how to shut off the gas in case of an emergency?
04/06/2018
81Appendixes
6.7 Navien H2Air Add-on Controller Kit (Optional)
The Navien H2Air is an add-on controller for the Navien NPE-A series water heaters. It adds input and output
functions to the NPE-A series water heaters for a combination application where space heating and domestic hot
water (DHW) are supplied simultaneously. With this add-on controller, a thermostat (1 or 2-stage) and an outdoor
sensor can be installed along with a hydronic air handler to add space heating functionality to the system.
CAUTION
This device is designed to work with the NPE-A series models ONLY.
Basic Principles
The following diagram shows the basic operation of an NPE-A series water heater system with the Navien H2Air add-on controller.
CAUTION
Do not configure the system for DHW recirculation when it is configured to run an air handler using the H2Air add-on controller. DHW
recirculation and Navien H2Air configurations cannot be used at the same time.
Flow Switch
Check
Valve
Expansion
Tank
Cold Water
Supply
DHW Supply
Space Heating
Supply
Heat Demand
Output
Thermostat
Outdoor Sensor
NPE-A Series
Water Heater
Space Heating
Return
Mixing Valve
For details, refer to the installation manual that is provided with the H2Air add-on controller kit.
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82 Appendixes
6.8 Navien HotButton Kit (Optional)
The Navien HotButton kit is an add-on input board for the Navien NPE-A series water heaters. It adds
signal input functions to the NPE-A series water heaters for more efficient DHW hot water recirculation
functionality.
With the HotButton kit, DHW recirculation is carried out exactly when the actual demands arise. This
prevents energy loss caused by unnecessary operation of the burner a nd pump throughout the day.
The HotButton kit can receive signals from multiple push buttons installed in various areas and performs
optimal DHW recirculation only when there is a demand for hot water.
CAUTION
This device is designed to work with the NPE-A series models ONLY.
Basic Principles
The following diagram shows the basic operation of an NPE-A series water heater system with the Navien HotButton kit.
CAUTION
The Navien HotButton can be used ONLY with a water heater system configured for DHW recirculation.
DHW return
(to recirculation inlet)
(to hot water fixtures)
DHW supply
Cold water lineCity water supply 1 2 3 4 ONSW1CE1RA1U1CE1C1C2C7R6SW1Q112 V SIGNAL SIGNAL 1GND5 V J1R5J2C4ZD1R7 D1 CON3CON2CON1 SIGNAL SIGNAL 3GND SIGNAL 2To cold water inlet
Push button
contact signal
Push button
contact signal
Push button
contact signal
For details, refer to the installation manual that is provided with the HotButton kit.
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83Appendixes
6.9 Requirements for the State of Massachusetts
NOTICE BEFORE INSTALLATION
This appliance must be installed by a licensed plumber or gas fitter in accordance with the Massachusetts Plumbing and Fuel Gas Code 248
CMR Sections 4.00 and 5.00.
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
seven (7) feet 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. No installation or replacement of a vented gas appliance shall be permitted unless a
battery powered or electrically hard wired carbon monoxide detector is present on the same floor as the appliance or on the next adjacent
floor when the appliance is located in a crawl space unless the appliance is located in a detached, uninhabitable garage. For all residential
dwellings, a carbon monoxide detector must also be present on each habitable level of the dwelling. These requirements shall not be
deemed to waive any additional requirements imposed by M.G.L. c. 148 §26F1/2.
2. APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as required in accordance with the above provisions shall
comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certified.
3. SIGNAGE. Whenever any through-the-wall vent is installed less than seven feet above the finished grade, a metal or plastic identification
plate shall be permanently mounted to the exterior of the building at a minimum height of eight feet above grade directly in line with the
exhaust vent terminal. The sign shall read, in print size no less than 0.5 inches 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 5.09 and 5.12.
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Memo
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Getting Service
If your water heater requires service, you have several options for getting service:
Contact Technical Support at 1-800-519-8794 or on the website: www.navien.com.
For warranty service, always contact Technical Support first.
Contact the technician or professional who installed your water heater.
Contact a licensed professional for the affected system (for example, a plumber or electrician).
When you contact Technical Support, please have the following information at hand:
Model number
Serial number
Date purchased
Installation location and type
Error code, if any appears on the front panel display
Navien, Inc.
800.519.8794 www.Navien.com
20 Goodyear, Irvine, CA 92618
Installation Manual
NPE Condensing Water Heaters
THE LEADER IN CONDENSING TECHNOLOGY
Version: 5.3 (Feb. 25, 2016)
04/06/2018