Navien NBH Series User's Information Manual
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Navien NBH Series User's Information Manual

Condensing boilers
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User's Information Manual
NHB Condensing Boilers
Model
NHB-055
NHB-080
NHB-110
NHB-150
H
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, ANSIZ223.1/NFPA 54 and/or CSA B149.1, Natural Gas and Propane Installation Code.
Keep this manual near this boiler for future reference whenever maintenance or
service is required.

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Summary of Contents for Navien NBH Series

  • Page 1 User’s Information Manual NHB Condensing Boilers Model NHB-055 NHB-080 NHB-110 NHB-150 Keep this manual near this boiler for future reference whenever maintenance or service is required. WARNING If the information in these instructions is not followed exactly, a fire or explosion may result, causing property damage, personal injury, or death.

  • Page 2: Table Of Contents

    Contents 1. Safety Information 2. About the Boiler 2.1 Description of the Boiler 2.2 Parts of the Boiler 2.3 The Front Panel 3. Operating the Boiler 3.1 Turning the Boiler On or Off 3.2 Adjusting the Temperature 3.3 Viewing Basic Information 3.4 Resetting the Boiler 4.

  • Page 3: Safety Information

    1. Safety Information The following safety symbols are used in this manual. Read and follow all safety instructions in this manual precisely to avoid WARNING unsafe operating conditions, fire, explosion, property damage, personal injury, or death. Keep this manual for future reference. If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life.
  • Page 4 DANGER DANGER This boiler’s water temperature is set to 120°F (49°C) at the factory for your safety and comfort. Increasing the temperature increases the risk of accidental scalding. Water temperatures at or above 125°F (52°C) can cause instant scalding, severe burns, or death.
  • Page 5 CAUTION 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, or maintenance may lead to property damage, personal injury, or death and will void your warranty.

  • Page 6: About The Boiler

    2. About the Boiler 2.1 Description of the Boiler 2.2 Parts of the Boiler The Navien NHB boiler is available in 4 models: NHB-055, NHB-080, NHB-110 and NHB-150. 2.2.1 Front View The main features are as follows: Combustion Power Interruption: When the power is restored after a power...

  • 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 Using the buttons 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. Refer to the following table for detailed information.

  • Page 9: Operating The Boiler

    3. Operating the Boiler 3.2 Adjusting the Temperature WARNING Follow the instructions below to avoid unsafe operating 3.2.1 Adjusting the Space Heating Temperature conditions that could cause property damage, severe personal injury, or death. To adjust the heating temperature: 1. Press the Mode button once. The space heating mode icon Ensure that the boiler is filled with water before turning it on.

  • Page 10: Viewing Basic Information

    3.2.2 Adjusting the DHW Indirect Supply 3.3 Viewing Basic Information Temperature To view information about the boiler, press the Mode button three times. “INFO” will appear on the display. WARNING Before adjusting the water temperature, read “To prevent burns:” on page 4 carefully. Water above 120°F can cause instant scalding, severe burns, or death.

  • Page 11: Resetting The Boiler

    3.4 Resetting the Boiler Display Description If an error message appears, you can try resetting the boiler to resolve the problem. To reset the boiler, press the Reset button. Boost interval time (set by installer) Space heating water pressure in PSI MODE DHW priority time System supply water temperature...

  • Page 12: Maintaining The Boiler

    4. Maintaining the Boiler 4.1 Cleaning the Boiler 3. Close the gas valve. CAUTION Make sure the boiler is turned off and the power supply is disconnected before cleaning the boiler. The boiler may remain hot for several minutes after it is turned off. To prevent burns, wait until the boiler has cooled down before cleaning.

  • Page 13: Cleaning The Air Intake Filter

    5. Remove the drain cap on the manifold system to drain the 4.3 Cleaning the Air Intake Filter boiler. If the air intake filter becomes clogged by dust or lint, the boiler will cease to operate and “Error Code 110” will appear on the front panel display.
  • Page 14 4. Remove the screw that secures the air intake filter (the filter is 6. Remove the filter from the plastic assembly. Dust and rinse it located at the top left of the boiler). with clean running water. 7. Allow the filter to dry completely. 8.

  • Page 15: Protecting The Boiler From Freezing

    1. Press the Power button on the front panel to turn off the boiler. CAUTION Close the gas valve. Damage due to freezing is not covered by the Navien limited warranty. Freezing damage is most likely to occur due to back drafting caused by negative pressure in the building.

  • Page 16: Maintenance Schedules

    4.5 Maintenance Schedules Service technician (See the following instructions) Regular maintenance is required to operate the boiler safely. Refer General: to the maintenance schedules below for proper maintenance of Address reported problems. the boiler. Inspect interior; clean and vacuum if necessary.
  • Page 17 Inspecting the Boiler Interior WARNING 1. Remove the front cover and inspect the interior of the boiler. Follow the service and maintenance procedures given 2. Vacuum any sediment from inside the boiler and components. throughout this manual and in component literature Remove any obstructions.
  • Page 18 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 time, rendering the valve 2. Check the cold fill pressure for the system. Verify it is correct inoperative.
  • Page 19 2. If the flame is unsatisfactory at either high fire or low fire, check valves (“A” and “B”) must be installed on the near boiler for obstructions in the venting and ensure that the air intake piping (included with Navien Manifold System). filter is clean. Review with the Owner 1.
  • Page 20 4. Connect one tube to the “B” valve and place the free end in the bucket. Navien Manifold System 5. Connect one of the tubes to the circulation pump outlet and the return water line at the “A” valve.

  • Page 21: 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. MODE For minor problems, resetting the boiler may resolve the issue. To reset the boiler, press the Reset button on the front panel.

  • Page 22: 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 over temperature Auto reset/Manual reset/Power On reset E003 Ignition failure Manual reset/Power On reset...
  • Page 23 You must contact the original installer of your Product. Your rated portion of the warranty below. installer will need to contact Navien to report the issue. If the original installer cannot be identified or you no longer choose to During the applicable warranty period, replacement of the use that service provider, you may choose any service provider Product or components may be authorized by Navien only.
  • Page 24 What is not covered? Warranty Limitations Navien’s Limited Warranty shall be void in the event of an EXCEPT AS EXPRESSLY PROVIDED HEREIN, THERE ARE NO OTHER occurrence of any of the following: WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO WARRANTIES OR MERCHANTABILITY OR FITNESS FOR A...
  • Page 25 Notes...
  • Page 27 Getting Service If your boiler requires service, you have several options for getting service: Contact Technical Support at 1-800-519-8794 or on the website: www.navien.com. For warranty service, always contact Technical Support first. Contact the technician or professional who installed your boiler.

This manual is also suitable for:

Nhb-055Nhb-080Nhb-110Nhb-150

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