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User's Information Manual
NFB-H Condensing Boilers
Model
NFB-175H
NFB-200H
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.
Keep this manual near this boiler for future
reference whenever maintenance or service
is required.
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Table of Contents
Related Manuals for Navien NFB-175H
Summary of Contents for Navien NFB-175H
- Page 1 User’s Information Manual NFB-H Condensing Boilers Model NFB-175H NFB-200H 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.
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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 System Temperatures 3.3 Accessing Basic Menu Items 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 DANGER this manual precisely to avoid unsafe operating conditions, fire, explosion, property damage, If you do not follow these instructions exactly, personal injury, or death. - Page 4 WARNING WARNING 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 ● before turning off the electrical power supply at service entrance panel. Doing so may result in severe personal injury or death.
- Page 5 CAUTION 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 NFB-H boiler is available in 2 models: NFB-175H and NFB-200H. 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
3. Operating the Boiler WARNING Follow the instructions below to avoid unsafe operating conditions that could cause property damage, severe personal injury, or death. Ensure that the boiler is filled with water before turning it on. ● If overheating occurs or the gas supply fails to shut off, shut off the gas supply to the boiler by using the ●... - Page 10 3.2.1 Adjusting the Space Heating 3. Rotate the Command dial ( ) to the right or Temperature (When “3. Zone Priority left to increase or decrease the temperature. Setting” is disabled) 4. Press the Command dial ( ) to confirm the new temperature.
- 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...
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Page 12: Accessing Basic Menu Items
3.3 Accessing Basic Menu Items 2. Rotate the Command dial ( ) to the right to select the DHW temperature. In the Menu Select screen, you can view the boiler’s operating conditions, configure the space heating and DHW temperatures, and review error history. Press the Menu button ( ) to enter the Menu Select screen. -
Page 13: Resetting The Boiler
Item Description Item Description AHU Space Heating Set Outdoor reset curve load Temperature (°F) type (displayed when the outdoor reset option “21. If AHU is not connected, ● Outdoor Reset” is enabled) “--” will be displayed. 1: Finned Tube Baseboard 5. -
Page 14: 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 OPEN minutes after it is turned off. To prevent burns, CLOSE wait until the boiler has cooled down before Closed... -
Page 15: Cleaning The Air Intake Filter
4.3 Cleaning the Air Intake Filter 5. Remove the drain cap on the manifold system to drain the 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. To properly maintain the boiler, clean the air intake filter as needed or as part of the annual maintenance. -
Page 16: 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... -
Page 17: 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 18 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 19 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 20 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 21 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 22: 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 23: 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 E003 Ignition failure Manual reset E004... - Page 24 1 year limited-labor warranty (“Warranty”) Retail Price (MSRP), at the time the warranty claim covers defects in materials or workmanship when is approved by Navien, as indicated in the following the Navien NFB-H Boiler (“Product”) is installed Coverage Table for Heat Exchangers Only. This...
- Page 25 No one is authorized to make any other warranties external temperature, force majeure, riot, act of on behalf of Navien. Some states do not allow the war, or any acts of God. exclusion or limitation of incidental or consequential...
- Page 27 ● Installation location and type ● Error code, if any appears on the front panel display. ● Version: 1.0 (January, 2021) Navien, Inc. 800.519.8794 www.navieninc.com 20 Goodyear, Irvine, CA 92618 T H E L E A D E R C O N D E N S I N G...