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Vent Free Gas Fireplace

Category: Vent-Free Gas Fireplace:
  1. What is a ODS pilot assembly?
  2. What size tank should I use for L.P.?
  3. Why do I get an odor when I operate my fireplace?
  4. Can I convert my gas appliance to another type of gas?
  5. Does my fireplace put off water and if so how much?
  6. Can I install a vent-free gas fireplace in my bedroom?
  7. Can I install a vent-free gas fireplace in my mobile home?
  8. I need to replace the thermocoupler on my stove. How do I do this?
  9. My gas fireplace has difficulty keeping the pilot lit after shutdown.



  10. 1.
    What is a ODS pilot assembly?

    The ODS or Oxygen Depletion Sensor is a pilot assembly including a thermocouple. This pilot can only operate when the oxygen level in the room is at least 18%, a problem that will only happen in higher elevations. This operates by the thermocouple responding to changes in the pilot and when heated, generates a small current of electricity, which keeps the gas supply valve in the open position. If the oxygen level approaches ANSI defined minimums, the flame extinguishes. The loss of flame causes the thermocouple to cool. This cooling reduces the millivolt reading, causing the gas valve to return to its normally closed position. The unit will not operate until the living space is properly ventilated and adequate oxygen is introduced into the space. The ODS is a safety assurance that your vent-free gas fireplace will operate properly. It is not recommended to install vent-free appliances as a primary heat source above 5000 ft. because of pilot outages.
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    2. What size tank should I use for L.P.?

    We recommend checking your local codes first. Expect to use at least a 100 pound cylinder. Using a 20 cylinder may cause problems during extreme cold conditions i.e., freezing regulator, frost on tank, nuisance shut downs.
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    3. Why do I get an odor when I operate my fireplace?

    Are there any smokers in the house? The heater will pick up tobacco smoke and spread it through the house in the form of a yellow film clinging to walls. If you have pets, the animal dander will produce the same results. These heaters will also pick up new odors from the environment and spread them throughout the room.
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    4. Can I convert my gas appliance to another type of gas?

    It is not recommended. The American Gas Association certifies the unit according to the gas type used. Changing this gas type will change the certification, which is not allowed by AGA. Also, if you were to attempt to convert a unit it would cost more in parts and labor than it would to purchase a unit for the proper gas. Conversion of any appliance would also void any remaining warranty on the unit.
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    5. Does my fireplace put off water and if so how much?

    All vent-free appliances, whether natural or propane, produce water. The accumulation can range from 3/4 to 1 pint of moisture per hour in the room. Under normal conditions, this does not cause a problem. However, if you have a problem, you will need to provide an outlet for this moisture. Adequate ventilation or using a dehumidifier will help.
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    6. Can I install a vent-free gas fireplace in my bedroom?

    As long as your fireplace produces less than 10,000 BTU's in a bedroom and less than 6,000 BTU in a bathroom it can be installed according to NFPA54. Also, check your local code to see if this is permitted.
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    7. Can I install a vent-free gas fireplace in my mobile home?

    As long your local codes permit it.
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    8. I need to replace the thermocoupler on my stove. How do I do this?

    The thermocouple is part of the pilot assembly. Replacement of the ODS must be as a complete assembly. NOTE: Common pilot outages are frequently the result of a thermocouple dropping millivolts. This does not mean the thermocouple is defective and in most cases isn't. Cleaning the device will correct the situation most of the time. If you still need to replace the ODS Pilot Assembly, it is available through our parts department but can only shipped to qualified gas technicians. Any replacement gas component to a gas appliance, especially a vent-free unit, must be performed by qualified professional.
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    9. My gas fireplace seems to have difficulty keeping the pilot lit after shutdown.

    It just needs to be cleaned. Use emery cloths or steel wool to do the job.
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