Navien NPE-150S2 User Manual

ALWAYS read and follow this manual completely before using
the water heater. Save for future reference.
Tested and Certified to NSF/ANSI 372 for lead free* compliance.
* 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
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, ANSI Z223.1/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, Manufactured Home.
Do not install this water heater in a recreational vehicle, trailer, boat or other moving vehicles as it will
result in a Carbon Monoxide Poisoning Hazard.
Model
NPE-180A2
NPE-210A2
NPE-240A2
NPE-180S2
NPE-210S2
NPE-240S2
NPE-150S2
NPE-150S2
Excluded
ENERGY STAR
Certied

Navien NPE-150S2 Specifications

General

Type	Tankless
Fuel Type	Natural Gas or Propane
Energy Efficiency	0.96 UEF
Category	Residential
Electrical	120V, 60Hz
Water Connection	3/4" NPT
Minimum BTU	15, 000 BTU/h
Warranty	15 years heat exchanger, 5 years parts
Gas Connection	3/4 inch
Vent Size	2"/3"
Vent Material	PVC, CPVC
Ignition	Electronic Ignition
Maximum BTU	150, 000 BTU/h

Summary

Important Safety Information

General Safety Warnings

Covers warnings about fire, explosion, gas leaks, and emergency steps for safety.

Specific Safety Precautions

Details warnings regarding flammable substances, electrical hazards, CO poisoning, and proper venting.

Burn Prevention and Scalding Hazards

Warns about scalding hazards from hot water and provides prevention measures.

Installing the Water Heater

Installation Location Requirements

Provides guidelines for selecting a suitable installation location, considering clearances and utilities.

Venting and Ventilation Guidelines

Details requirements for proper venting and ventilation to ensure safe operation.

Installation Clearances

Lists minimum clearance requirements for installation around the unit.

Mounting the Water Heater

Provides step-by-step instructions for securely mounting the water heater to a wall.

Gas Supply Connection

Details the process for safely connecting the gas supply, including warnings.

Inlet Gas Pressure Measurement

Explains how to measure inlet gas pressure and its importance for proper operation.

Water Supply Connection

Outlines the steps for connecting the water supply, including guidelines.

Recirculation Modes (Internal/External)

External Pump Wire Connection

Pressure Relief Valve Installation

Details the requirements and procedure for connecting a pressure relief valve.

Condensate Drain Connection

Explains how to connect the condensate drain line and disposal options.

Combustion Air and Venting Requirements

Discusses the importance of clean combustion air and lists corrosive contaminants.

Water Heater Venting Procedures

Provides essential guidelines and warnings for properly venting the water heater.

Vent Type Selection and Clearances

Non-Direct Venting Procedures

Vent Pipe Material Selection

Power Supply Connection

Details the process for connecting the power supply, including electrical safety.

DIP Switch Configuration

Explains how to configure DIP switches for gas type and temperature lock settings.

Altitude Setting Procedure

Guides on setting the unit's altitude for optimal performance, including conversion kits.

Installing a Cascade System

Cascade System Water Supply Connection

Communication Cable Connection and Configuration

Installing a Common Vent System

Common Vent System Overview

Common Vent System Installation Guidelines

Provides essential guidelines for installing a common vent system safely and correctly.

Common Vent Collar Kit Installation

Starting the Common Vent System

Connecting Vent Pipes

Condensate Drain for Common Vent Systems

Common Vent System Setup and Clearances

Common Vent System Maintenance

Operating the Water Heater

Adjusting Water Temperature and Commercial Mode

Details how to adjust water temperature and use Commercial Mode.

Recirculation Mode Settings

Installer Menu Access and Operation

Guides on accessing the installer menu, including password entry.

Service Status and Parameter Settings

Explains how to view service status and set operation parameters.

Application Settings

Guides on setting application parameters for NaviLink, AHU, and air handlers.

Cascade System Configuration

Guides on configuring the cascade system, including setup and diagnosis.

System Diagnosis and Test Modes

Appendixes

Gas & High Altitude Conversion

Explains the process of converting the water heater for propane gas or high altitude.

Wiring Diagrams

Installation Checklist

Provides a checklist to ensure all installation steps and requirements have been met.

Massachusetts Installation Requirements