What is the "T" wire for on a thermostat?
I just purchased a Honeywell programmable thermostat to replace my old Trane thermostat. I have a heat pump system with auxillary mode. Installation is fairly straightforward as outlined in the manual but afterwards I am left with a wire that was hooked to the "T" screw and is now unhooked. I have two possible places to put it, either in "L" or "RC" or I could just tape it off with electrical tape if it serves no use. Ultimately the key is knowing what it does. Of course I tried Honeywell support but they are closed today and I would really like to get this project finished since I am so close to being done. Any help would be appreciated.
Best answer:
Answer by Ret68
I personally dont know but I found a site that seemed to describe what you have run into. Check out: http://www.handymanwire.com/ubbthreads/showflat.php?Cat=&Board=UBB7&Number=424052&page=68&view=collapsed&sb=9&o=&fpart=1 ...Good Luck, hope it helps...
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T is usually an outdoor thermistor (a variable resistor which changes resistance with temperature).
It compensates for weather by varying cycles of heating/cooling.
It “anticipates” weather changes, making your thermostat correct itself to changes of outdoor temperature, making your house more comfortable.
The new stat doesn’t need one. Not all stats have this feature but I wouldn’t worry about it, just tape it off or disconnect it on the other end too.