Navien Tankless Water Heater Manual: Installation Guide for NPE-180A2, NPE-150S2, and NPE-240S2
- June 6, 2024
- Navien
Table of Contents
The Navien NPE-180A2 Tankless Water Heater Installation Guide provides detailed instructions for the installation and operation of the Navien NPE- 180A2, NPE-150S2, and NPE-240S2 tankless water heaters. It is essential to read the manual before installing the product as it must be installed and serviced by a licensed professional. The manual includes safety precautions, location requirements, and installation guidelines. It also provides information on gas and water piping connections, venting options, electrical connections, and operating the water heater. The guide includes step-by-step instructions for installing the water heater on the wall, removing the front cover, and measuring the inlet gas pressure. It also provides information on how to reset the water heater and ensure maximum water flow. The Navien NPE- 180A2 Tankless Water Heater Installation Guide is an essential resource for anyone looking to install and operate a Navien tankless water heater.
Navien NPE-180A2 Tankless Water Heater Installation Guide
Model
NPE-180A2 / 210A2 / 240A2
NPE-150S2/180S2 / 210S2 / 240S2
Before Installing
Read the Installation Manual before installing.
This product must be installed and serviced by a licensed plumber, a licensed gas fitter, or a professional service technician. Navien is not liable for any damages or defects resulting from improper installation. When applicable, the installation must conform with Manufactured Home Construction and Safety Standard, Title 24 CFR, Part 3280 and/or CAN/CSA Z240 MH Series, Mobile Homes.
Do not install this water heater in a recreational vehicle, trailer, boat or other vehicular type unit as it will result in a Carbon Monoxide Poisoning Hazard.
WARNING
Follow all local codes and/or the most recent edition of the National Fuel Gas Code (ANSI Z223.1/NFPA 54) in the USA, or the Natural Gas and Propane Installation Code in Canada (CAN/CGA B149.1).
Safety
DO NOT install in areas with excessively high humidity.
Location Requirements
Select the best location on “Choosing an Installation Location” in the Installation Manual.
Allowable minimum clearances
Installing
Unpacking
Checking the Rating Plate
This 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 Propane conversion kit
must be used.
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 Inc. is not liable for any property damage and/or personal injury resulting from improper conversions.
Mounting on the Wall
CAUTION
Do not install the water heater on drywall without proper reinforcement.
- Drill in the supplied anchor bolts after considering where the vent termination will be located.
- Secure the mounting bracket to the wall with the tapping screws and anchors.
- Lift up the water heater, rest the unit on the hooks provided on the wall bracket on the wall.
- Install two set screws through the bracket at the bottom of the water heater to secure the water heater on the wall.
Removing the Front Cover
Gas Piping Connections
Example:
- 1 CFH=1,020 Btuh
1/2″ rigid pipe can be used; refer to the sizing tables in the Installation Manual for limitations. Avoid using 1/2″ corrugated connectors or tubing as noise may occur.
Water Piping Connections (NPE-180A2/210A2/240A2)
Internal Recirculation
External Recirculation using the Cold Water Inlet
External Recirculation using the Recirculation Inlet
Internal Recirculation Settings
Press the Menu button ( ) to access the Main menu, and select 1. Recirculation Setting > 3. Internal Recirculation by pressing the OK button (OK).
External Recirculation Settings
Press the Menu button ( ) to access the Main menu, and select 1. Recirculation Setting > 2. External Recirculation by pressing the OK button (OK).
Condensate Drain Connection
A condensate drain pipe must be connected to the ½2″ condensate outlet fitting at the bottom of the unit and water must be poured into the exhaust connection to fill the condensate trap.
The end of the ½” (NPT) plastic piping should drain into a laundry tub or into a floor drain.
Note Do not submerge the end of the pipe in water.
Venting
Vent Termination Options
Indoor Horizontal Vent Termination
Vertical vent termination
Sidewall vent termination
Concentric Vent Termination
Sidewall installation
Roof installation
Image of outdoor vent cap
Venting Length
Exhaust Vent Piping 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.
Navien recommended venting materials
- Refer to the manufacturer’s literature for detailed information on approved vent materials.
** 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.
Electrical Connections
After Installing
Opening All the Valves
Gas Valve
Operating the Water Heater
Power ON
To turn the water heater on, press the Power button ( ).
When the power is on for the first time, you must complete the start-up wizard. The temperature will appear on the front panel display after then when the power is on.
Adjust the Water Temperature
Press the Up button ( ) or the Down button ( ) until the desired temperature appears on the display. You can adjust the temperature while the display is flashing. Once the display stops flashing, the temperature setting is stored.
View Basic Information
To access to view the water heater’s operating conditions, configure the DHW temperature, or review the error history, press the Menu button ( ).
Note If resetting does not solve the problem, refer to the troubleshooting section of the User’s Information Manual or contact the service center.
Resetting the Water Heater
If an error message appears, you can try resetting the water heater to resolve the problem. To reset the water heater, press the Back button ( ).
Measuring the Inlet Gas Pressure
CAUTION
The Navien water heater cannot operate properly without sufficient inlet gas pressure and volume. The instructions on how to check the inlet gas pressure are stated above. THIS IS ONLY TO BE DONE BY A LICENSED PROFESSIONAL.
Installing the Front Cover
Ensure Maximum Water Flow
After using the water heater for the first 10 minutes, please stop using it and clean the cold water filter and recirculation water filter of any trapped debris.
Final Check
A trial run should be performed in accordance with the Installation checklist listed in the Installation Manual.
Navien, Inc.
20 Goodyear, Irvine, CA 92618
Tel: 1-800-519-8794, Fax:
1-949-420-0430
www.navieninc.com
Specifications
Model| NPE-180A2 / 210A2 / 240A2
NPE-150S2/180S2 / 210S2 / 240S2
---|---
Before Installing| Read the Installation Manual before installing. This
product must be installed and serviced by a licensed plumber, a licensed gas
fitter, or a professional service technician. Navien is not liable for any
damages or defects resulting from improper installation.
Safety| DO NOT install in areas with excessively high humidity.
Location Requirements| Select the best location on “Choosing an Installation
Location” in the Installation Manual. Allowable minimum clearances
Gas Piping Connections| 1/2″ rigid pipe can be used; refer to the sizing
tables in the Installation Manual for limitations. Avoid using 1/2″ corrugated
connectors or tubing as noise may occur.
Water Piping Connections| Internal Recirculation
External Recirculation using the Cold Water Inlet
External Recirculation using the Recirculation Inlet
Internal Recirculation Settings
External Recirculation Settings
Condensate Drain Connection| A condensate drain pipe must be connected to the
½2″ condensate outlet fitting at the bottom of the unit and water must be
poured into the exhaust connection to fill the condensate trap. The end of the
½” (NPT) plastic piping should drain into a laundry tub or into a floor drain.
Note Do not submerge the end of the pipe in water.
Venting| Vent Termination Options
Venting Length
Exhaust Vent Piping Materials
Electrical Connections|
Operating the Water Heater| Power ON
Adjust the Water Temperature
View Basic Information
Resetting the Water Heater
Measuring the Inlet Gas Pressure
Ensure Maximum Water Flow
Final Check| A trial run should be performed in accordance with the
Installation checklist listed in the Installation Manual.
Contact Information| Navien, Inc.
20 Goodyear, Irvine, CA 92618
Tel: 1-800-519-8794, Fax:
1-949-420-0430
www.navieninc.com
FAQ’s
Who should install the Navien tankless water heater?
The Navien tankless water heater must be installed and serviced by a licensed plumber, a licensed gas fitter, or a professional service technician.
What safety precautions should I follow when installing the Navien tankless water heater?
Do not install the water heater in areas with excessively high humidity. Follow all local codes and/or the most recent edition of the National Fuel Gas Code (ANSI Z223.1/NFPA 54) in the USA, or the Natural Gas and Propane Installation Code in Canada (CAN/CGA B149.1).
Can I install the Navien tankless water heater in a recreational vehicle or boat?
No, you cannot install the Navien tankless water heater in a recreational vehicle, trailer, boat, or other vehicular type unit as it will result in a Carbon Monoxide Poisoning Hazard.
Can I convert the Navien tankless water heater from natural gas to propane or vice versa?
Yes, you can convert the Navien tankless water heater from natural gas to propane or vice versa using a Navien gas conversion kit. Do not attempt a field conversion of this water heater without a Navien gas conversion kit.
What materials should I use for venting the Navien tankless water heater?
Venting requirements differ in the US and Canada. Consult 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.
How do I adjust the water temperature on the Navien tankless water heater?
Press the Up button or the Down button until the desired temperature appears on the display. You can adjust the temperature while the display is flashing. Once the display stops flashing, the temperature setting is stored.
How do I reset the Navien tankless water heater?
If an error message appears, you can try resetting the water heater to resolve the problem. To reset the water heater, press the Back button.
How do I ensure maximum water flow on the Navien tankless water heater?
After using the water heater for the first 10 minutes, please stop using it and clean the cold water filter and recirculation water filter of any trapped debris.
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