After searching the web, it appears that my thermostat is the honeywell vision pro, with a Trane name. So why did they choose to use the fossil fuel kit when the thermostat is fully capable of doing the job?
That thermostat has not been out all that long. Just a few short years back we HAD to use the fossil fuel kit. Why did they choose to use the fossil fuel kit AND the Vision Pro/Trane stat? Your guess is as good as mine. My guess would be that they dont seem to have a clue. Bubba
You can't control both stages of the gas furnace with that stat with a heat pump as primary and furnace as auxillary heat. X2 is the only source from the stat for aux heat, therefore, W1 and W2 must be jumpered together at the furnace.
Ed
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