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Navien NHB-080 - Service Manual

Navien NHB-080
147 pages
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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 suppliers 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.
Keep this manual near this boiler for
future reference whenever maintenance
or service is required.
Service Manual
NHB Condensing Boilers
Model
NHB-055
NHB-080
NHB-110
NHB-150

Table of Contents

Other manuals for Navien NHB-080

Questions and Answers

Summary

Safety Information

Safety Definitions

Defines key safety terms like DANGER, WARNING, and CAUTION.

Safety Symbols

Explains the meaning of hazard symbols used in the manual.

Safety Precautions

Lists essential safety measures regarding flammable materials and venting.

Product Information

Product Information Items

Details the NHB Series gas boiler models and their heating capacities.

Components

Diagram showing the key components of the boiler.

Technical Data

General Specifications

Provides heating input, capacity, AFUE, and water pressure ratings.

Dimensions

Illustrates boiler dimensions and lists supply connection sizes.

System Details

Setting the DIP Switches

Explains configuration of operation status and capacity via DIP switches.

Measuring the Inlet Gas Pressure

Details the procedure for measuring inlet gas pressure.

Gas Conversion

Outlines the process for converting the boiler from Natural Gas to Propane.

The Front Panel

Describes the boiler's front panel interface, including LCD display and buttons.

Error Display and RESET

Explains how to view error codes and reset the boiler.

Adjusting the Space Heating Temperature

Guide on how to adjust the space heating water temperature.

Adjusting the DHW Temperature

Guide on how to adjust the domestic hot water temperature.

Error occurrence history display

Instructions for accessing and viewing the error history log.

Special Parameter mode

Accessing advanced parameter settings for qualified professionals.

Resetting the Boiler (Factory Reset)

Procedure for performing a factory reset on the boiler.

Error Code

Lists common error codes and their corresponding conditions.

Key Components Description

Details the function and troubleshooting checks for major boiler components.

Troubleshooting

Error code classification

Categorizes error codes by system and provides self-diagnostic actions.

001 Error

Troubleshooting steps for overheating of heat exchanger.

003 Error

Troubleshooting steps for ignition failure.

012 Error

Troubleshooting steps for flame loss.

109 Error

Troubleshooting steps for fan motor RPM errors.

110 Error

Troubleshooting steps for air pressure errors.

205 Error

Troubleshooting steps for heat exchanger output temp sensor errors.

Troubleshooting guide by symptom

Guides troubleshooting based on observed symptoms like noise or temp issues.

Replacement of Parts

Replacement Procedure

General safety precautions and steps before replacing parts.

Components Replacement Instructions

Detailed instructions for replacing major components.

PCB

Steps for replacing the Printed Circuit Board (PCB).

Fuse

Instructions for replacing the fuse.

Fan (Combustion Air)

Steps for replacing the combustion air fan.

Flame Rod

Instructions for replacing the flame rod.

Ignition Transformer

Steps for replacing the ignition transformer.

APS

Instructions for replacing the Air Pressure Sensor.

Main Gas Valve

Steps for replacing the main gas valve.

Water Pressure Sensor

Instructions for replacing the water pressure sensor.

Components Diagram and Part List

Case Assembly

Diagram and part numbers for the boiler's case assembly.

Heat Exchanger and Waterway Assembly

Diagram and part numbers for the heat exchanger and waterway components.

Combustion Parts Assembly

Diagram and part numbers for the combustion assembly.

Inspection and Maintenance Schedule

Annual Servicing

Recommendations for maintaining safe and efficient operation annually.

Maintenance Report

Template for recording inspection and maintenance tasks.

Maintenance Schedules

Overview of owner maintenance tasks by frequency.

Inspection Report

Template for recording inspection results.

Summary

Safety Information

Safety Definitions

Defines key safety terms like DANGER, WARNING, and CAUTION.

Safety Symbols

Explains the meaning of hazard symbols used in the manual.

Safety Precautions

Lists essential safety measures regarding flammable materials and venting.

Product Information

Product Information Items

Details the NHB Series gas boiler models and their heating capacities.

Components

Diagram showing the key components of the boiler.

Technical Data

General Specifications

Provides heating input, capacity, AFUE, and water pressure ratings.

Dimensions

Illustrates boiler dimensions and lists supply connection sizes.

System Details

Setting the DIP Switches

Explains configuration of operation status and capacity via DIP switches.

Measuring the Inlet Gas Pressure

Details the procedure for measuring inlet gas pressure.

Gas Conversion

Outlines the process for converting the boiler from Natural Gas to Propane.

The Front Panel

Describes the boiler's front panel interface, including LCD display and buttons.

Error Display and RESET

Explains how to view error codes and reset the boiler.

Adjusting the Space Heating Temperature

Guide on how to adjust the space heating water temperature.

Adjusting the DHW Temperature

Guide on how to adjust the domestic hot water temperature.

Error occurrence history display

Instructions for accessing and viewing the error history log.

Special Parameter mode

Accessing advanced parameter settings for qualified professionals.

Resetting the Boiler (Factory Reset)

Procedure for performing a factory reset on the boiler.

Error Code

Lists common error codes and their corresponding conditions.

Key Components Description

Details the function and troubleshooting checks for major boiler components.

Troubleshooting

Error code classification

Categorizes error codes by system and provides self-diagnostic actions.

001 Error

Troubleshooting steps for overheating of heat exchanger.

003 Error

Troubleshooting steps for ignition failure.

012 Error

Troubleshooting steps for flame loss.

109 Error

Troubleshooting steps for fan motor RPM errors.

110 Error

Troubleshooting steps for air pressure errors.

205 Error

Troubleshooting steps for heat exchanger output temp sensor errors.

Troubleshooting guide by symptom

Guides troubleshooting based on observed symptoms like noise or temp issues.

Replacement of Parts

Replacement Procedure

General safety precautions and steps before replacing parts.

Components Replacement Instructions

Detailed instructions for replacing major components.

PCB

Steps for replacing the Printed Circuit Board (PCB).

Fuse

Instructions for replacing the fuse.

Fan (Combustion Air)

Steps for replacing the combustion air fan.

Flame Rod

Instructions for replacing the flame rod.

Ignition Transformer

Steps for replacing the ignition transformer.

APS

Instructions for replacing the Air Pressure Sensor.

Main Gas Valve

Steps for replacing the main gas valve.

Water Pressure Sensor

Instructions for replacing the water pressure sensor.

Components Diagram and Part List

Case Assembly

Diagram and part numbers for the boiler's case assembly.

Heat Exchanger and Waterway Assembly

Diagram and part numbers for the heat exchanger and waterway components.

Combustion Parts Assembly

Diagram and part numbers for the combustion assembly.

Inspection and Maintenance Schedule

Annual Servicing

Recommendations for maintaining safe and efficient operation annually.

Maintenance Report

Template for recording inspection and maintenance tasks.

Maintenance Schedules

Overview of owner maintenance tasks by frequency.

Inspection Report

Template for recording inspection results.

Navien NHB-080 Specifications

General IconGeneral
ModelNHB-080
Fuel TypeNatural Gas or Propane
Heating Capacity80, 000 BTU/h
Max. Input (NG)80, 000 BTU/h
Max. Input (LP)80, 000 BTU/h
Min. Input (NG)16, 000 BTU/h
Min. Input (LP)16, 000 BTU/h
Output BTU/h80, 000 BTU/h
Gas Connection Size3/4" NPT
Voltage120V
TypeCondensing Boiler
Temperature Range (°F)80-180°F
Vent Size2"/3"
Efficiency95% AFUE

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