Navien NFC-250/200H User's Information Manual
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Navien NFC-250/200H User's Information Manual

Condensing combi-boilers
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User's Information Manual
NFC-H Condensing Combi-Boilers
NFC-250/175H
Model
NFC-250/200H
NSF/ANSI 372
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
ual near this boiler for future ref
whenever maintenance or service is required.
ntenance or service is required.
* The wetted surface of this product contacted by consumable water
contains less than one quarter of one percent (0.25%) of lead by
weight.

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Summary of Contents for Navien NFC-250/200H

  • Page 1 User’s Information Manual NFC-H Condensing Combi-Boilers NFC-250/175H Model NFC-250/200H Keep this manual near this boiler for future reference ual near this boiler for future ref whenever maintenance or service is required. ntenance or service is required. NSF/ANSI 372 * The wetted surface of this product contacted by consumable water contains less than one quarter of one percent (0.25%) of lead by...

  • 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 DANGER 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 BURN warranty.
  • Page 6 DANGER This boiler’s DHW 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. Before you decide to change the temperature setting, read the following charts carefully.

  • Page 7: About The Boiler

    2. About the Boiler 2.1 Description of the Boiler 2.2 Parts of the Boiler The Navien NFC-H boiler is available in 2 models: NFC-250/175H and NFC-250/200H. 2.2.1 Front View The main features are as follows: Power Interruption: When the power is restored...

  • Page 8: 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 9 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.

  • Page 10: Operating The Boiler

    3. Operating the Boiler 3.2 Adjusting the System Temperatures WARNING Follow the instructions below to avoid unsafe operating conditions that could cause property 3.2.1 Adjusting the Space Heating damage, severe personal injury, or death. Temperature Ensure that the boiler is filled with water To adjust the heating temperature: before turning it on.
  • Page 11 5. Press the Back button ( ) to return to normal 2. Rotate the Command dial ( ) to the right to operation mode, or rotate the Command dial select the DHW temperature. ) to adjust other operation conditions. You can adjust the temperature while the highlighted section is flashing.

  • Page 12: Accessing Basic Menu Items

    3.3 Accessing Basic Menu Items Item Description AHU Space Heating Set In the Main Menu 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, “--” Press the Menu button ( ) to enter the Main Menu will be displayed.

  • Page 13: Resetting The Boiler

    3.4 Resetting the Boiler Item Description 22. Flow control If an error message appears during boiler operation, 100 - Close state valve status reset the boiler to resolve the problem. Press the Back button ( ) on the front panel to reset the 23.

  • 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 minutes after it is turned off. To prevent burns, Open Closed wait until the boiler has cooled down before...

  • Page 15: Cleaning The Air Intake Filter

    5. Remove the drain cap on the manifold system 4.3 Cleaning the Air Intake Filter 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 4. Remove the screw that secures the air intake 6. Remove the filter from the plastic assembly. filter (the filter is located at the top left of the Dust and rinse it with clean running water. boiler). 7. Allow the filter to dry completely. 8.

  • Page 17: Protecting The Boiler From Freezing

    This is not a manufacturing protection. defect, and therefore, Navien will not If the boiler will not be used for an extended warrant any damages due to freezing. The period, drain the boiler.

  • Page 18: Maintenance Schedules

    4.5 Maintenance Schedules Service technician (See the following instructions) General: Owner maintenance Address reported problems. Inspect interior; clean and vacuum Check the boiler area is free if necessary. of combustible/flammable Clean condensate trap and fill with materials and air contaminants. Daily fresh water.
  • Page 19 Addressing the Reported Problems Checking the Flue Vent System and Air Piping Inspect any problems reported by the owner and correct before proceeding. 1. Visually inspect the entire flue gas venting system and air piping for blockage, Inspecting the Installation Area deterioration or leakage.
  • Page 20 Checking Expansion Tank WARNING Expansion tanks provide space for water to move in and out as the heating system water expands Certain naturally occurring conditions may due to temperature increase or contracts as the corrode the valve or its components over water cools.
  • Page 21 3 hoses A water circulation pump 2 flush valves (if not installed) Before flushing the heat exchanger, Note additional flush valves (“A” and “B”) must be installed on the near boiler piping (included with Navien Manifold System). Maintaining the Boiler...
  • Page 22 5 minutes. d. Close the “A” valve and open the “C” valve. 11. Disconnect all tubes and valves. 12. Reconnect the power supply to the boiler. Navien Manifold System 13. Press the Power button ( ) on the front panel to turn on the boiler.

  • 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 Manual RESET E001 Heatexchanger over temperature Auto RESET E003 Ignition failure Manual RESET Manual RESET...
  • Page 25 Error Code Reason Self-diagnostic/Action Manual RESET E615 Abnormal operation: input and memory Auto RESET Alarm E736 Abnormal operation: cascade communication Alarm Abnormal operation: outdoor temperature sensor (appears only E740 Alarm when the outdoor reset curve is enabled). E761 Abnormal Operation: Pre-Heat Aquastat Alarm E762 Abnormal flue gas duct: Vent pipe not properly inserted...
  • Page 26 (1) year from the date of installation. All repair parts Navien. At Navien’s request, the defective Product must be genuine Navien parts. All repairs and or part must be returned to Navien. When the replacements must be performed by an individual Product is installed in new construction, the date...
  • Page 27 No one is authorized to make any other warranties of the boiler, the gas supply line, the venting on behalf of Navien. Some states do not allow the connection, combustion air openings, electric exclusion or limitation of incidental or consequential...
  • Page 29 Serial number Date purchased Installation location and type Error code, if any appears on the front panel display. Version: 1.0 (February, 2021) Navien, Inc. 800.519.8794 www.navieninc.com 20 Goodyear, Irvine, CA 92618 T H E L E A D E R...

This manual is also suitable for:

Nfc-250/175h

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