Nest Wiring

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Old 11-13-19, 12:27 AM
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Nest Wiring

Morning all, I am upgrading to the Nest Learning Thermostat, and was on the phone with a Nest tech for an hour verifying all the wiring that they would verify. (All wires verified by them, except the white and brown wires in the nestwiring.jpg)

My unit is an American Standard model number 4TEE3F48A1000AA (acfaceplate.jpg)

Original thermostat wiring (oldwiring.jpg)
Y2 - black
X2 - brown
W1 - white

The wiring in the unit (unitwiring.jpg) has a gray wire on W2 (no grey wire at the thermostat, so assuming wiring isn't the same harness all the way through) and brown and two white wires on W1.

This is a gas heater, and electric element dual unit. Trying to compare with all the other posts that kind of match my wiring, I have hooked white to W2, and unhooked the brown for now. The heat does work, but I do not hear the usual whoosh from the gas lighting as it comes on, so I am guessing I have it reversed.

Could anyone please verify and correct me? Thank you so much! (Forgive me if I did something wrong in the post, tried to go through the rules beforehand)

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Last edited by PJmax; 11-13-19 at 09:53 PM. Reason: resized pictures
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Old 11-13-19, 09:59 PM
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Welcome to the forums.

Your wiring does not support a gas furnace.
Your 4TEE3F48A is an air handler with electric heat..... not a furnace.

Do you have a separate furnace ??
 
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Old 11-15-19, 07:44 PM
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Sorry, the copper line going into the unit ran right next to my gas line, so I assumed wrong, it is electric.
 
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Old 11-15-19, 08:26 PM
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The white on W2/AUX is correct. That's your regular electric reheat coils.
The brown on the * is emergency heat if you program the * for that function.
The brown wire is not needed for routine operation.
 
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