Heat Pumps and Electric Heating - Installing Honeywell RTH7500D Thermostat

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ABV_Cruz
10-24-09, 01:47 PM
I am trying to install a Honeywell RTH7500D Thermostat without success. When I install it, I have no access to Emer. (AUX) heat and the fan will not turn on. The original configuration is as follows:

Blue - Y2
White - W
Yellow - Y1
Green - G
Red - R
Black - C
Orange - O

Could someone give me the correct sequence for the wiring? Thanks.

Houston204
10-24-09, 08:02 PM
The Honeywell RTH7500D will not support your 2 speed heatpump with auxillary heat.

http://i151.photobucket.com/albums/s160/Houston204/RTH7500.jpg


I recommend a Honeywell Visionpro TH8321

http://i151.photobucket.com/albums/s160/Houston204/VisionPro3Heat2Cool.jpg

On the TH8321 ...
Y2 = blue
Aux & E = white (use jumper wire)
Rc & R = red
O/B = orange
Y = yellow
G = green
C = black

option 170 = 12
option 190 = 0
Jay11J
10-24-09, 09:33 PM
Do you have an extra unused wire in the wall?

What is the make and model of your furnace/air handler?