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  1. #1
    Join Date
    Feb 2008
    Posts
    10

    Setback thermostat to control gas fireplace?

    I have a natural gas fireplace with a standing pilot and a thermopile in series with a normal SPST 120 volt switch. It uses a Honeywell VS8421 gas valve. I believe that closing the switch allows current to flow to open the gas valve and the pilot then ignites the gas. I want to be able to use an electronic setback thermostat to ignite and turn off the gas burner at given times. It seems to me that I should just be able to take the wires that are currently attached to the SPST switch and attach them to the RH and W terminals of an extra setback thermostat I have. When the thermostat calls for heat it will close the circuit and ignite the burner. When the set point has been reached, it will open the circuit and cut off the gas. In other words, it will function just as the SPST switch, but I will be able to control it by time and temperature. I believe that VS8421 operates on a low enough voltage that this should not be a problem. Any opinions?

  2. #2
    Join Date
    Feb 2008
    Location
    lugoff southcarolina
    Posts
    11
    not sure setback that is are we dealing millivolts if you are that tstat will notwork

  3. #3
    Join Date
    Apr 2007
    Location
    MN
    Posts
    297
    You need to make sure that the Tstat is capable of operating with millivoltage...can't think of a programmable off hand, but there should be a few.
    S**t or get off the pot!

  4. #4
    Join Date
    Feb 2007
    Location
    Las Vegas,NV
    Posts
    748
    I have used programable thermostats with millivolt furnaces before and they worked fine for me. Just have to see if it works for your particular setup.

  5. #5
    Join Date
    Oct 2007
    Location
    Midwest
    Posts
    194
    Quote Originally Posted by sammy37 View Post
    I have used programable thermostats with millivolt furnaces before and they worked fine for me. Just have to see if it works for your particular setup.
    Did you use a battery powered stat?

  6. #6
    Join Date
    Feb 2003
    Location
    Huntsville,AL
    Posts
    4,125
    do you have a death wish?
    want to get rid of Mother- in- Law?

    you might if you do not have a fresh air source ALL the time the logs are being used!
    harvest rainwater,make SHADE,R75/50/30= roof/wall/floor, use HVAC mastic,caulk all wall seams!

  7. #7
    Join Date
    Jun 2004
    Location
    Howell, Michigan
    Posts
    16,184
    Since we are not quite sure what kind of fireplace you have, and the fact that this is not a DIY help site, this thread is closed.

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