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belanger44 08-04-2012 03:45 PM

heat pump tstat install
I'm trying to switch my old trane stat to a new honeywell stat. i think I've got it figured out but i don't know where to put the 't' wire in the new stat. i believe it controls the thermistor. please help.

old stat: new stat:
red-r c-blue
orange-o o/b-orange
green-g g-green
yellow-y y-yellow
white-x2 to u e-white
blue-b c-blue

hvactech126 08-04-2012 03:53 PM

aux needs jumpered to E. Tan is taped off and not used.

belanger44 08-04-2012 03:58 PM

why is 't' tape off. it is connected in the condenser outside.

hvactech126 08-04-2012 04:01 PM

the honeywell thermostat does not use it.

belanger44 08-04-2012 04:03 PM

will it effect the heat pump in any way? performance?

belanger44 08-04-2012 04:04 PM

does the 't' wire control the thermistor?

hvactech126 08-04-2012 04:07 PM

T sent a signal to the old t-stat for temp. It is not necessary for the new thermostat. It really doesn't matter what it did. It was only for proprietary thermostats from trane.

belanger44 08-04-2012 04:19 PM

thank you for our help

turnermech 08-04-2012 06:08 PM

the t terminal is only required for that trane tstat. it was used for the heat anticipator. that stat needed the t input. the honeywell does not.

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