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Posted by HeatPro on November 01, 2008 at 17:05:35:
In Reply to: Re: adding outdoor thermostat to control high fire gas valve posted by Dave on November 01, 2008 at 16:19:48:
: I just bought one and will run the bulb outside on the north side of our house up where the siding ends just above the foundation. Will that get enough air flow to get reliable outdoor temp?
Yes, if that is above the snow line, which is why they recommend near an eave.
: What temp should I set it for the contacts to close and run the high fire?
"allow it only to function when the outdoor temp is below 20 degrees" Set the differential as low as it can go to 4.5 degrees and set the operating point to 25F, so there is no 'cold' time during a change of outdoor temperature. You can move the set point up or down based on observation.