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User's Information Manual
NHB-H Condensing Boilers
Model
NHB-055H
NHB-080H
NHB-110H
NHB-150H
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.
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Table of Contents
Related Manuals for Navien NHB-055H
Summary of Contents for Navien NHB-055H
- Page 1 User’s Information Manual NHB-H Condensing Boilers Model NHB-055H NHB-080H NHB-110H NHB-150H ALWAYS read and follow this manual completely before using the boiler. Save for future reference. WARNING If the information in these instructions is not followed exactly, a fire or explosion may result, causing property damage, personal injury, or death.
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Page 2: Table Of Contents
4.3 Cleaning the Air Intake Filter 4.4 Protecting the Boiler from Freezing 4.5 Maintenance Schedules 5. Troubleshooting 5.1 Solving Basic Problems 5.2 Understanding Error Codes 6. LIMITED WARRANTY NAVIEN, INC. 25 Product Installation Information Model Date Purchased Gas Type Serial Number... -
Page 3: Important Safety Information
1. Important Safety Information The following Safety Alert Symbols are used DANGER in this manual. They are used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid If you do not follow these instructions exactly, possible serious injury or death. - Page 4 WARNING WARNING To prevent death, serious injury, or property To prevent death, serious injury, or property damage: damage: Do not touch the power cord or internal ● components of the boiler with wet hands. Doing so may result in electric shock. Do not make any electrical connections ●...
- Page 5 WARNING Do not attempt to repair or replace any ● part of the boiler, unless it is specifically recommended in this manual. For all other service, contact an authorized technician or licensed professional. Improper adjustments, alterations, service, maintenance may lead to property damage, personal injury, or death and will void your warranty.
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Page 6: About The Boiler
2. About the Boiler 2.1 Description of the Boiler 2.2 Parts of the Boiler The Navien NHB-H boiler is available in 4 models: NHB-055H, NHB-080H, NHB-110H and NHB-150H. 2.2.1 Front View The main features are as follows: Combustion Power Interruption: When the power is restored ●... -
Page 7: The Front Panel
2.3 The Front Panel The front panel allows you to adjust the temperature and view the operating status or error codes. Remove the protective sheet from the front panel before using it. 2.3.1 Icons and Digital Display The icons and digital display on the front panel provide important information required for the boiler’s operation. - Page 8 2.3.2 Buttons and Command Dial Using the buttons and the Command dial ( ) on the front panel, you can turn on or off the boiler, monitor the current operation status, and set the values required for the boiler’s operation, such as space heating and DHW supply temperatures.
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Page 9: Operating The Boiler
Note 3.2 Adjusting the System Temperatures Navien NHB-H boilers include multi-temperature zone priority feature that allows the boiler to operate at up to 3 different temperatures. This built-in feature can be accessed from the front panel and eliminates the need for additional accessories that are typically required for multi-temperature applications when used with a combination of heating sources such as baseboard, in-floor heating, and/or an indirect DHW tank. - Page 10 3.2.1 Adjusting the Space Heating 3.2.2 Adjusting the Space Heating Temperature (When “3. Zone Priority Temperature (When “3. Zone Priority Setting” is disabled) Setting” is enabled) To adjust the heating temperature: To adjust the heating temperature: 1. In normal operation mode, rotate the Command 1.
- Page 11 2. Press the Command dial ( ) to select the desired zone, and then press the Command dial ( ). The selected zone’s temperature will flash. The number of the zones differs depending on the zone settings and Pump 1 settings. Note Zone Settings Pump1 Settings Space heating settings for each zone...
- Page 12 3.2.3 Adjusting the DHW Indirect 3. Press the Command dial ( ) to select the indirect DHW temperature ( ). The highlighted Supply Temperature section will flash. DANGER Water temperatures at or above 125°F (52°C) can cause instant scalding, severe burns, or death. Before you decide to change the temperature setting, read the following table carefully.
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Page 13: Accessing Basic Menu Items
3.3 Accessing Basic Menu Items Item Description AHU Space Heating Set In the Menu Select screen, you can view the boiler’s Temperature (°F) operating conditions, configure the space heating and DHW temperatures, and review error history. If AHU is not connected, ●... -
Page 14: Resetting The Boiler
3.4 Resetting the Boiler Item Description Outdoor reset curve load If an error message appears during boiler operation, type (displayed when the reset the boiler to resolve the problem. Press the outdoor reset option “21. Back button ( ) on the front panel to reset the Outdoor Reset”... -
Page 15: Maintaining The Boiler
4. Maintaining the Boiler 4.1 Cleaning the Boiler 3. Close the gas valve. CAUTION Scald Hazard To prevent scalding: OPEN Make sure the boiler is turned off and the power CLOSE supply is disconnected before cleaning the Closed Open OPEN CLOSE boiler. -
Page 16: Cleaning The Air Intake Filter
4.3 Cleaning the Air Intake Filter 5. Remove the drain cap and open the purge valve on the manifold system to drain the boiler. If the air intake filter becomes clogged by dust Purge Valve or lint, the boiler will cease to operate and “Error Code 110”... -
Page 17: Protecting The Boiler From Freezing
● to back drafting caused by negative pressure in the building. This is not a manufacturing defect, and therefore, Navien will not warrant any damages due to freezing. The installer is responsible for ensuring that there is sufficient make-up air to avoid such a situation and the owner is responsible for 5. -
Page 18: Maintenance Schedules
If hot water will not flow and you Note ● Service technician (See the following instructions) suspect that the boiler is frozen, contact an authorized technician or General: licensed professional. Address reported ● This boiler requires very little problems. ● maintenance, however a qualified Inspect interior;... - Page 19 Inspecting the Boiler Interior WARNING 1. Remove the front cover and inspect the interior of the boiler. Follow service maintenance ● procedures given throughout this manual 2. Vacuum any sediment from inside the boiler and in component literature shipped with and components.
- Page 20 Checking the Water System WARNING 1. Verify all system components are correctly installed and operational. Certain naturally occurring conditions may ● corrode the valve or its components over 2. Check the cold fill pressure for the system. Verify time, rendering the valve inoperative. Such it is correct (must be a minimum of 6 psi).
- Page 21 Inspecting the Ignition and Flame Checking the Burner Flame Detector Electrodes 1. Inspect flame through observation window. 1. Remove the ignition and flame detector 2. If the flame is unsatisfactory at either high fire electrodes from the boiler heat exchanger. or low fire, check for obstructions in the venting and ensure that the air intake filter is clean.
- Page 22 2. Disconnect the power supply to the boiler. (included with Navien Manifold System). 3. Close the “C” and “D” valves on the supply and return water lines. 4. Connect one tube to the “A” valve and place the free end in the bucket.
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Page 23: Troubleshooting
5. Troubleshooting 5.1 Solving Basic Problems If you experience a problem with the boiler, refer to the following chart for possible remedies. Error codes that appear on the front panel display are explained in the following section. For minor problems, resetting the boiler may resolve the issue. -
Page 24: Understanding Error Codes
5.2 Understanding Error Codes When an error code appears on the front panel, refer to the following chart for a definition and possible remedy for the situation. Error Code Reason Self-diagnostic/Action E001 Heat Exchanger Overheat Check for proper system flow. E003 Ignition Failure Check gas supply valve and igniter. -
Page 25: Limited Warranty Navien, Inc
You must contact the original installer of your Product. Your installer single family residential application (hereinafter “Commercial”) then the will need to contact Navien to report the issue. If the original installer parts warranty will be reduced to three (3) years and the heat exchanger cannot be identified or you no longer choose to use that service warranty to seven (7) years. - Page 26 What is not covered? Warranty Limitations Navien’s Limited Warranty shall be void in the event of an occurrence of EXCEPT AS EXPRESSLY PROVIDED HEREIN, THERE ARE NO OTHER any of the following: WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO WARRANTIES OR MERCHANTABILITY OR FITNESS FOR A PARTICULAR ●...
- Page 27 Memo...
- Page 29 User’s Information Manual NHB-H Condensing Boilers Getting Service If your boiler requires service: All repairs require pre-authorization by Technical Support. ● Request for your installer or any licensed professional to contact Technical Support at ● 1-800-519-8794 Option 2 once at the installation site. A short list of independent service providers in your area can be found on the website: ●...