Navien NHB-055H User Manual

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.
ALWAYS read and follow this manual
completely before using the boiler.
Save for future reference.
User’s Information Manual
NHB-H Condensing Boilers
Model
NHB-055H
NHB-080H
NHB-110H
NHB-150H

Navien NHB-055H Specifications

General

Category	Boiler
Brand	Navien
Model	NHB-055H
Fuel Type	Natural Gas / Propane
Max. Input (NG)	55, 000 BTU/h
Max. Input (LP)	55, 000 BTU/h
Efficiency	95% AFUE
Water Connection Size	3/4 inch
Voltage	120V
Type	Condensing
Heating Capacity	55, 000 BTU/h

Summary

1. Important Safety Information

Safety Alert Symbols

Defines DANGER, WARNING, CAUTION, and NOTICE symbols used in the manual for hazard communication.

General Safety Warnings

Provides critical warnings about fire, explosion, and personal injury risks associated with boiler operation.

Appliance Operation Safety

Covers safe use, flammable liquids, combustibles, and venting requirements to prevent hazards.

California Prop 65 Warning

States the legally required warning regarding potential cancer and reproductive harm.

Boiler Operation and Maintenance Safety

Details safety precautions for repairs, children, supply lines, and unauthorized parts to ensure safe operation.

2. About the Boiler

2.1 Description of the Boiler

Outlines key features, models, and operational aspects of the Navien NHB-H boiler.

2.2 Parts of the Boiler

Identifies and illustrates the main components and connections of the boiler.

2.3 The Front Panel

Introduces the boiler's control panel for monitoring status and making adjustments.

2.3.1 Icons and Digital Display

Explains the meaning of various icons and digital indicators shown on the front panel.

2.3.2 Buttons and Command Dial

Describes the function of the control buttons and command dial for navigating and setting boiler parameters.

3. Operating the Boiler

3.1 Turning the Boiler On or Off

Provides straightforward instructions on how to power the boiler on and off.

3.2 Adjusting the System Temperatures

Explains how to set space heating and domestic hot water temperatures for desired comfort levels.

3.2.1 Adjusting Space Heating Temperature (Disabled)

Details steps to set space heating temperatures when zone priority is disabled.

3.2.2 Adjusting Space Heating Temperature (Enabled)

Details steps to set space heating temperatures when zone priority is enabled.

3.2.3 Adjusting the DHW Indirect Supply Temperature

Guides on setting the domestic hot water temperature, including critical scald warnings.

3.3 Accessing Basic Menu Items

Explains navigation of the menu to view status, configure settings, and review error history.

3.4 Resetting the Boiler

Instructs on how to reset the boiler to resolve operational problems or error messages.

4. Maintaining the Boiler

4.1 Cleaning the Boiler

Provides instructions for safely cleaning the exterior of the boiler using appropriate methods.

4.2 Draining the Boiler

Explains the procedure for draining the boiler to prevent freeze damage during extended shutdowns.

4.3 Cleaning the Air Intake Filter

Details how to clean the air intake filter to ensure optimal boiler performance and prevent error codes.

4.4 Protecting the Boiler from Freezing

Offers guidelines to prevent freeze damage, noting it is not covered by warranty.

4.5 Maintenance Schedules

Outlines daily, monthly, periodic, and seasonal maintenance tasks for owners and technicians.

5. Troubleshooting

5.1 Solving Basic Problems

Offers remedies for common boiler issues using a problem, cause, and solution chart.

5.2 Understanding Error Codes

Provides a comprehensive list of error codes, their reasons, and recommended self-diagnostic actions.

6. LIMITED WARRANTY NAVIEN, INC.

Warranty Coverage Details

Explains warranty terms for labor, parts, and heat exchangers for residential and commercial applications.

How to Get Service

Guides customers on the process for obtaining warranty service and lists required information.

What is Not Covered

Lists conditions and situations that will void the Navien limited warranty.

Warranty Limitations

Details limitations on implied warranties and potential exclusion of incidental or consequential damages.

Getting Service