Join Date: Apr 2008
Location: Windsor ON Cogeco
To expand on what TKG is telling you. Your fireplace pilot burner is always on, it's heating a Thermopile which is just a thermocouple that produces a higher voltage than a thermocouple. The thermoplile is producing approximately 750 millivolts. This is all the power needed to activate and run the gas valve. All they have done is wired in the wall switch you're referring to in series into that circuit so you have a more convenient way of turning off the flame other than going and opening up the control panel on the fireplace. As stated, the wall switch has to be rated for a millivolt circuit, otherwise you can have issues due to the higher resistance of some switches. The only thing that is wired into a 120v circuit is the circulation fan if you have one installed.
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