Navien NPN-199U User Manual

Getting Service
If your water heater requires service, you have several options for getting service:
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Contact Technical Support at 1-800-519-8794 or on the website: www.navieninc.com.
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For warranty service, always contact Technical Support first.
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Contact the technician or professional who installed your water heater.
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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:
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Model number
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Serial number
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Date purchased
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Installation location and type
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Error code, if any appears on the front panel display
800.519.8794 www.navieninc.com
20 Goodyear lrvine, CA 92618
Installation & Operation Manual
NPN Non-Condensing Water Heaters
TANKLESS WATER HEATERS · BOILERS
Version: 1.0 (January. 2021)

Navien NPN-199U Specifications

General

Category	Water Heater
Type	Tankless
Fuel Type	Natural Gas
Energy Efficiency	0.96 UEF
Gas Connection	3/4" NPT
Water Connection	3/4" NPT
Voltage	120V
Minimum Activation Flow Rate	0.5 GPM
Flow Rate	11.2 GPM
Venting	2" PVC/CPVC or Polypropylene
Temperature Range	140°F
Warranty	15 years heat exchanger, 5 years parts
Maximum BTU Input	199, 000 BTU/h

Summary

Getting Service

Safety Information

If you smell gas

Instructions to follow if you smell gas.

Do not use or store flammable products

Warning against storing flammable materials near the unit.

About the Water Heater

2.1 Items Included

2.3 Specifications

Lists technical specifications of the water heater models.

2.4 The Front Panel

Explains the controls and display of the front panel.

2.5 Components

2.6 Dimensions

2.7 Rating Plate

Installing the Water Heater

3.1 Choosing an Installation Location

Guides on selecting an appropriate location for the water heater.

3.2 Mounting the Water Heater to the Wall

Details how to securely mount the water heater to a wall.

3.3 Connecting the Gas Supply

Provides instructions for safely connecting the gas supply.

3.3.2 Measuring the Inlet Gas Pressure

Explains how to measure the inlet gas pressure for proper operation.

3.4 Connecting the Water Supply

Guides on connecting the water supply lines to the unit.

3.4.4 Connecting a Pressure Relief Valve

Instructions for installing an approved pressure relief valve on the hot water outlet.

3.5 Venting the Water Heater (Indoor Models Only)

Details proper venting procedures for indoor models.

3.5.1 About the Vent Installation Detector

3.5.2 Maintaining Clearances

Specifies required clearances for vent terminals based on codes.

3.6 Connecting the Power Supply

Guides on safely connecting the water heater to the electrical supply.

3.7 Setting the DIP Switches

Instructions for configuring the water heater's functions via DIP switches.

Configuring the Remote Controller System

4.4 Remote Controller

Appendixes

6.5 Component Assembly Diagrams and Parts Lists

6.5.1 Case Assembly (NPN-160U/180U/199U)

6.5.2 Case Assembly (NPN-120E/160E/180E/199E)

6.5.3 Burner Assembly (NPN-160U/180U/199U)

6.5.4 Burner Assembly (NPN-120E/160E/180E/199E)

6.5.5 Water Assembly

6.6 Installation Check list

A checklist to ensure all installation steps have been correctly completed.

6.9 Requirements for the State of Massachusetts

Outlines specific installation requirements for Massachusetts.