Wiring Google nest with no C wire
#1
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Wiring Google nest with no C wire
I am trying to install a google nest thermostat in my old milwaukee thermoflo furnace; model 1203-B10. I do not have a current C WIRE hooked up at the thermostat. There are 3 wires run to the thermostat, but only 2 are used. Could it be as simple as connecting the unused wire to the TR spot? Would this make it a "c wire" that I could hook up the spot for the C wire on my nest?
Last edited by PJmax; 12-06-22 at 05:45 PM. Reason: resized pics
#2
Welcome to the forums.
I had previously resized your pics for the board.
I need to know the three colors of the wires to the thermostat.
I had previously resized your pics for the board.
I need to know the three colors of the wires to the thermostat.
#4
Very good.
Your blue wire will connect to the blue wire from the transformer.
The letters in yellow are the system function.
Your blue wire will connect to the blue wire from the transformer.
The letters in yellow are the system function.
#8
You can connect them any way that is convenient.
Personally.... I would replace the TR crimp with both wires.
Personally.... I would replace the TR crimp with both wires.