Very confused on wiring

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Very confused on wiring

Postby bryanjbenn » Wed Oct 24, 2012 8:37 am

I have a Q674L 1132 that I'm trying to replace with a Honeywell RTH7400. The original T-stat only has 5 wires.

W
G
R
O
Y

For the life of me I cannot figure out how that would translate over to the RTH7400. I've looked at the wireing layouts in the manual 100 times now and I am just not sure where the wires should go, and I certainly don't want to "guess".

Anyone able to shed any light on this one?
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- Very confused on wiring

Postby charity89 » Thu Oct 25, 2012 3:17 am

I think you could choose "W" to try.
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Postby Freon » Thu Oct 25, 2012 8:12 am

Look at page 22 and 23 of the Installation manual. That shows how to wire the thermostat for a heat pump. Based on the old wire connections I am assuming you have a heat pump.
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- Very confused on wiring

Postby bryanjbenn » Thu Oct 25, 2012 9:24 am

Thanks...yes I do have a heat pump......but not sure where the "W" wire from the old tstat goes on the new one. There is no "W" spot.
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Postby Freon » Thu Oct 25, 2012 10:09 am

Looking at the diagram on pg 23, the W goes to the AUX terminal on the thermostat. You will need to pay close attention to the setup instructions on page 17. Since the old thermostat was an O it appears the changeover valve setting will be 0.
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Postby VeraKeisey » Tue Nov 06, 2012 1:52 am

The answer W is wrong? So what's correct answer?
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