Powerstealing thermostat wiring
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Powerstealing thermostat wiring
Hello. I am having trouble wiring a Trane powerstealing-type thermostat to a gas furnace in my garage. The furnace has R, W, and C terminals. My old mercury thermostat uses two wires (R and W). The Trane thermostat instructions say to wire a 360 ohm, 5 watt resistor across the W and C terminals on the furnace and wire the R and W to the thermostat (just like the old mercury one). There is no C terminal on the Trane thermostat.
The trouble is that when the Trane thermostat calls for heat, the furnace switches on for a second, then switches off and the thermostat power cycles.
I have tried wiring without the resistor and the same thing happens.
Thanks very much for any help. I am thinking that I probably need to get a different electronic thermostat--one with a C connection (or batteries).
The trouble is that when the Trane thermostat calls for heat, the furnace switches on for a second, then switches off and the thermostat power cycles.
I have tried wiring without the resistor and the same thing happens.
Thanks very much for any help. I am thinking that I probably need to get a different electronic thermostat--one with a C connection (or batteries).
#2
I'm not familiar with the Trane power stealers. The honeywells I have used in the past gets the resistor between R & W at the tstat, if there was R & C at the stat, I wouldn't have needed the resistor. At least if I remember correctly. I haven't used one in some time, I just use the battery powered digital stats. My recent favorite is the Lux PSP511LA. It's a 5/2 programmable, easy to program and has adjustable cycle rates & backlit panel.
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Thanks for the help. It turns out that for this application, it required two resistors. One between W and C and another between Y and C, even though Y is not used in this application.