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Upgrade Baystat 239 to a Honeywell RTH7600D controller

I have an air handler (American Standard TWH030B14,0A,FA) mounted in the attic connected to a heat pump (Trane XE1000) mounted outside controlled by a thermostat (Trane Baystat 239) mounted in the family room. I want to upgrade the Trane Baystat thermostat controller to a digital controller. The controller has the following terminals with corresponding wire color in a counter-clockwise pattern:
X2 = Black
O = Orange
G = Green
Y = Yellow
T = Brown
R = Red
W = White
U = n/a
F = n/a
B = Blue

I want to use a Honeywell RTH7600D touch screen to replace the Trane Baystat 239. Can you advise the correct terminal placement from the Baystat to the Honeywell controller?

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  • Dennis Boxerman May 11, 2010

    On comercial Trane units, you have to add a converter board as their controls do not directly hook up to a standard control. I would suggest calling Honeywell. They have been very helpful in the past and they make the unit you are trying to adapt. Trane has their own,unique control system. Good luck.

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For Trane sytems, B is your "Common" wire. O is your reversing valve relay, G is your fan, Y is your compressor contactor, R is Hot, Brown will not be used on your electronic tstat. X2 is your backup electric heaters. Without knowing what terminals are on your new tstat, I cannot offer more information than this. The installation manual may indicate what each terminal is controlling. I strongly suggest to write down ALL of the terminals and colors from your old t-stat and be sure to turn off the power to your air handler. Put the fan switch on your tstat to ON before turning off the power. Make sure the fan is running. Then turn the power off to your Air Handler. If your fan stops running, you have turned the power off to your tstat and are ready to start replacing it with your new tstat. I hope you find this helpful. Good Luck!!!

Posted on Feb 07, 2010

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