WIFI THERMOSTAT

9 years ago

I am attempting to install a WIFI thermostat. The thermostat requires a "c" connection. I do have an extra line that I can use in the "c" terminal on the thermostat, but I don't know where to attach that line at the Heater/AC unit. This is an old GE model BLU 123c948a1 and has no circuit boards or terminal blocks. The thermostat lines just run straight to the furnace and then attach directly to the furnace wires. Does anyone know where I might find attach this "c" wire?

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Comments (4)

randy427
9 years ago
The 'C' terminal is usually for a black wire connected to 24 volts.
dchall_san_antonio
9 years ago
I ended up calling the Honeywell hotline to get mine installed right. All I had was heat. My house wiring was the issue. There were more wires than expected. The young lady at the other end knew exactly what I was looking at. It was a very short call as I remember.
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mike_home
9 years ago
The C wire is the common or ground wire. You need to look for the 24V transformer connected to the furnace. The C wire needs to be connected to the ground side of the transformer.
sktn77a
9 years ago
"The young lady at the other end knew exactly what I was looking at. It was a very short call as I remember."

So nice (and uncommon) to get real help from modern manufacturers. I hope this young lady goes on to bigger and better things.