Thermostat Install

Old 09-27-12, 10:00 PM
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Thermostat Install

I am looking at replacing my two Honeywell thermostats (T8112D) 4-wire thermostats with Honeywell Z-Wave capable thermostats (YTH8320ZW1007/U) 5-wire that I have purchased via Amazon. The furnaces are York - about 13 years old. I initially was going to DIY and then got cold feet when I found out that the common wire was not present at the thermostat. So, after getting the run-around from two HVAC contractors, I am now back on the DIY train. From what I can determine I need a Common wire run down to the new thermostat. There are extra wires in the cable. So, after looking at these pictures, it appears to me that the terminal labeled C is Common and that all I need to do is hook up the unused black wire in the cable to this terminal and connect it appropriately on the thermostat end. Thanks for you input. Bob
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Old 09-28-12, 08:49 PM
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Bob, you are on the right track, do as you stated and all will be great.
Old 09-29-12, 05:53 AM
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And let us know if you have any questions on the advance settings..

One thing for sure we'd suggest setting the system type to 3-Hot Water/Hi Eff furnace.

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