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Old 11-13-2009, 10:32 PM   #1
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TRH7500D wiring for Traine Weathertron with heatpump


Could you please assist me with the wiring of my new Honeywell TRH7500D thermostat which is replacing a Trane Bayside 278 thermostat?

Old wires connecting

X2
O
G
Y
R
B
T

I have a heatpump and emergency heat switch on the current thermostat.

Thank you for your assistance
Steve

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Old 11-13-2009, 11:05 PM   #2
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TRH7500D wiring for Traine Weathertron with heatpump


Remove power to your air handler before replacing your thermostat. Write down your existing terminal = color combination. Color codes vary.
Old = New
X2 = E
O = O/B
G = G
Y = Y
R = RC & R (Use provided jumper)
B = C
T = Tape this wire off. Your new stat will not use this thermister terminal.

Set option 170 to 7
option 190 = 0









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Old 11-13-2009, 11:24 PM   #3
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TRH7500D wiring for Traine Weathertron with heatpump


Thank you very much. I apprecate it.

Steve
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Old 11-14-2009, 11:25 AM   #4
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TRH7500D wiring for Traine Weathertron with heatpump


I didn't see a W listed in your initial post. W = Aux.

Last edited by Houston204; 11-14-2009 at 11:33 AM.
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