Heat Pumps and Electric Heating - Wiring thermostat to existing heat pump

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albanese
10-15-09, 07:52 PM
I purchased a Honeywell RTH7500 thermostat. I have a Trane unit. I wired up the thermostat as per the diagram. Every time I turn on the unit it runs the heat. It has the following wires from the Trane unit to go to the terminals:
R, O, Y, B, G X2, W

Any help would be greatly appreciated.

Houston204
10-15-09, 08:06 PM
You must configure your new stat for heatpump operation. Set option 170 to 7 and option 190 to 0.

Be sure that your old B is connected to your new C and your old X2 is your new E.

Wires can break, and color substitutions are commonly made. Use your old color code and not my examples. So if your old X2 was a different color, your new E will be that color.



http://i151.photobucket.com/albums/s160/Houston204/RTH7500config.jpg


http://i151.photobucket.com/albums/s160/Houston204/Baystat.jpg



http://i151.photobucket.com/albums/s160/Houston204/RTH7500.jpg
albanese
10-15-09, 08:28 PM
Thanks. I did what you said and it works great.