Introduction
This manual provides essential information for the safe and proper installation, operation, and maintenance of your IHP OEM FMI ODS Pilot Assembly, model J3864. This component is designed for use with natural gas (NG) vent-free gas logs, stoves, fireplaces, and inserts manufactured by Comfort Glow, Comfort Flame, Desa, FMI, Vanguard, and Vantage Hearth. It is a critical safety component that monitors oxygen levels and ensures safe operation of your appliance.
Important: Read all instructions carefully before installation or use. Retain this manual for future reference.
Safety Information
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, injury, or death. Read the installation, operating, and maintenance instructions thoroughly before installing or servicing this equipment.
- Professional Installation Recommended: Due to the nature of gas appliances, installation and service should be performed by a qualified installer, service agency, or gas supplier.
- Gas Safety: Always ensure the gas supply to the appliance is turned off before performing any service or installation. Check for gas leaks after installation or service using a non-corrosive leak detection solution.
- Oxygen Depletion Sensor (ODS): This pilot assembly includes an ODS system, which is a safety device designed to shut off the appliance if oxygen levels in the room fall below a safe threshold. Do not bypass or tamper with the ODS system.
- Carbon Monoxide: Vent-free gas appliances produce carbon monoxide. Ensure adequate ventilation as specified by your appliance's manual. Install carbon monoxide detectors in your home.
- Part Compatibility: Use only genuine OEM replacement parts. This pilot assembly (J3864) is specifically for natural gas (NG) applications. Do not use with propane (LP) gas.
Package Contents
Verify that all components are present and undamaged upon receipt.
- 1 x IHP OEM FMI ODS Pilot Assembly - NG (J3864)
Image of the IHP OEM FMI ODS Pilot Assembly, designed for natural gas vent-free appliances. This assembly includes the pilot burner, thermocouple, and igniter.
Setup and Installation
This procedure should only be performed by a qualified service technician. Refer to your specific appliance's owner's manual for detailed installation instructions and diagrams.
- Disconnect Gas Supply: Turn off the main gas supply to the appliance and disconnect the appliance from the electrical power source (if applicable).
- Access Pilot Assembly: Carefully remove any covers, logs, or other components necessary to access the existing pilot assembly.
- Disconnect Old Assembly: Disconnect the thermocouple, pilot tube, and igniter wire from the gas valve and igniter module. Note their positions for reinstallation.
- Remove Old Assembly: Unfasten the mounting screws or clips holding the old pilot assembly in place and carefully remove it.
- Install New Assembly: Position the new IHP OEM FMI ODS Pilot Assembly (J3864) in the same location as the old one. Secure it with the mounting screws or clips. Ensure the bracket stamped NG8224 is correctly oriented.
- Reconnect Components: Reconnect the thermocouple, pilot tube, and igniter wire to their respective ports on the gas valve and igniter module. Ensure all connections are snug and correct.
- Restore Gas and Power: Turn the main gas supply back on. Reconnect electrical power if applicable.
- Leak Test: Apply a non-corrosive leak detection solution to all gas connections. Bubbles indicate a leak. If a leak is detected, turn off the gas supply immediately, tighten connections, and re-test. Do not operate the appliance if a leak is present.
- Test Operation: Follow the appliance's lighting instructions to ensure the pilot lights and stays lit, and the main burner ignites correctly.
Operating Instructions
The ODS Pilot Assembly is a component of your vent-free gas appliance. Its operation is integrated into the overall lighting and safety sequence of the appliance. Refer to your appliance's owner's manual for specific lighting instructions.
- Pilot Lighting: When attempting to light your appliance, the pilot flame should ignite and remain stable. The thermocouple, sensing this flame, generates a small electrical current to hold open the pilot valve.
- Main Burner Ignition: Once the pilot is established, the main burner can be ignited according to your appliance's controls.
- ODS Function: If the pilot flame is extinguished or if the oxygen level in the room drops, the ODS system will automatically shut off the gas supply to the appliance, preventing unsafe operation.
Maintenance
Regular inspection and cleaning of the pilot assembly can help ensure reliable operation.
- Annual Inspection: Have a qualified service technician inspect the pilot assembly annually for signs of wear, corrosion, or blockage.
- Cleaning: Dust and lint can accumulate around the pilot burner and ODS sensor. Carefully clean these areas using a soft brush or compressed air. Ensure the pilot flame opening is clear.
- Thermocouple Check: Ensure the thermocouple tip is properly positioned within the pilot flame. A weak or improperly positioned pilot flame can cause the thermocouple to cool, leading to the pilot extinguishing.
- Do Not Obstruct: Never obstruct the air openings around the pilot assembly or the ODS sensor.
Troubleshooting
If your appliance is not operating correctly, consult this section. For complex issues, contact a qualified service technician.
| Problem | Possible Cause | Solution |
|---|---|---|
| Pilot will not light. |
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| Pilot lights but will not stay lit. |
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| Main burner will not ignite after pilot is lit. |
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Specifications
- Model: J3864
- Part Numbers: IHP J3864 (Replaces FMI 104285-01 & PP229)
- Fuel Type: Natural Gas (NG) only
- Compatibility: Designed for various Comfort Glow, Comfort Flame, Desa, FMI, Vanguard, and Vantage Hearth vent-free gas logs, stoves, fireplaces, and inserts. Refer to your appliance's manual for specific part number verification.
- Bracket Stamping: NG8224
- Dimensions: Approximately 1"D x 3"W x 3"H (component size, not packaging)
- Weight: Approximately 2 pounds
Warranty and Support
For warranty information regarding your IHP OEM FMI ODS Pilot Assembly (J3864), please refer to the documentation provided with your original appliance or contact IHP directly. As an OEM part, warranty coverage may be tied to the appliance manufacturer's terms.
For technical support or assistance with installation and troubleshooting, it is recommended to contact a qualified HVAC technician, your gas supplier, or the retailer from whom you purchased the part.
