Original message
| cenolar
 |  "Installing RTH7000 Thermostat"
, posted Fri 31 Oct 10:35  
I have 2 heat-cooling zones and have installed 2 RTH7500 thermostats. The downstairs thermo works fine, both heating and cooling, but the upstairs doesn't function either way, no heating or cooling.
Downstairs thermo wiring:
C G Y W R W2
Upstairs wiring:
R W Y
Both function 0170 are set to 7.
How do I get the second zone working?
Thanks
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Replies:
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| Houston204
| "Re(1):Installing RTH7000 Thermostat" , posted Fri 31 Oct 18:48
The upstairs stat probably had a green wire to the G terminal.
Neither stat should have function 170 set to multistage heat pump. Heat pumps will generally require an O or B terminal to control a reversing valve.
Do you have gas heat or electric heat?
"Tip of the Day" Remember to remove power first.
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| | cenolar
| "Re(2):Installing RTH7000 Thermostat" , posted Fri 7 Nov 07:33
The upstairs only had the 3 wires, R, W, Y. If I don't set the downstairs 0170 to 7, it doesn't work at all.
I have gas heat.
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| | Houston204
| "Re(3):Installing RTH7000 Thermostat" , posted Fri 7 Nov 20:57
W is O/B when option 170 = 7. So the wire there should be for a reversing valve.
Set 170 to 1 upstairs and use coventional labels for your 3 wires.
Color codes vary, the colors used in this diagram are a common heatpump example.
"Tip of the Day" Remember to remove power first.
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| | cenolar
| "Re(4):Installing RTH7000 Thermostat" , posted Tue 11 Nov 09:48
I tried using the 0170 set to 1 upstairs and that still doesn't work.
I also realized on my original post I typed the main (downstairs) wiring incorrectly. It's actually
C-C
G-G
Y-Y
O-O/B
R-Rc with a wire to R
W - AUX
0170 - Set to 7
Upstairs
R-Rc with wire to R
W-W
Y-Y
0170 set to 1
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