Original message
| Lynch
 |  "Replacing thermostat with Honeywell rth8500"
, posted Fri 22 Aug 11:41  
I am replacing an old thermostat in which wire codes are (GREEN connected to G) ( BLACK connected to C) (White connected to W2)
(RED connected to R) (ORANGE connected to O) and (YELLOW connected to Y also has a jumper to W2) I have a heat pump and an electric furance.
O and B are separated on my old thermostat, where (ORANGE connected to O) and B is not connected. E is also not connected.
Honeywell's rth8500 has O/B connected together. Honeywell sates to connect the B wire to C terminal. Unfortunatly B is not connected on my old themostat only (ORANGE connected to O). Where does C go. I am reading istallation guide pages 10 - 12.
To make a long story short some letters seem to match but others do not. How to I wire my Honeywell Thermostat so it works with the heat pump and the electic furance.
Thanks. Lionel Lynch
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Replies:
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| Houston204
| "Re(1):Replacing thermostat with Honeywell rt" , posted Fri 22 Aug 21:15
Aux & E = white (use jumper wire)
Rc & R = red (use provided jumper)
O/B = orange
Y = yellow
G = green
C = black
You must also configure the stat to match your system.
option 170 = 7
190 = 0
240 = 9
"Tip of the Day" Remember to remove power first.
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