Original message
| pakow
 |  "Changing Honeywell Chrono ThermIII to RTH7400"
, posted Thu 31 Jul 18:30  
Hi,
I need to change out my old thermostat (Honeywell Chronotherm III to a RTH7400). Not sure whether to follow the Coventional or Heat Pump wiring instructions. My current system is a Heat/Cooling system (Gas Heat, Electric cooling), with an auxillary or emergency heat (electric). The wires I have are as follows:
R
C
O
Y1 & W1 ( one wire connected to both with a bridge)
E
W2
G
It seems like the instructions are telling me to follow the Conventional, but all the wires don't match.
Thanks in advance for the help!
Pakow
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Replies:
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| Houston204
| "Re(1):Changing Honeywell Chrono ThermIII to R" , posted Sat 2 Aug 22:44
Use heatpump.
R = Rc & R (use provided jumper)
C = C
O = O/B
Y1 & W1 = Y (no jumper here on new stat)
E = E
W2 = Aux
G = G
You must configure your new stat to match your system.
option 170 = 7 (multistage heatpump)
190 = 0 (O/B terminal is O)
240 = 9 (electric Aux heat)
"Tip of the Day" Remember to remove power first.
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| | pakow
| "Re(2):Changing Honeywell Chrono ThermIII to R" , posted Sat 2 Aug 22:50
Thanks!! I will give it a try tomorrow.
I really appreciate the response.
Pakow
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