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+-- Thread: Thermostat Wiring - W2/X2 Pin (/showthread.php?tid=7373549)
Thermostat Wiring - W2/X2 Pin - crokett™ - 07-27-2023
trying to decide if my upstairs thermostat is compatible with Nest. The existing labeling on the Trane thermostat and wiring is
R to red wire
W2/X2 to black wire
W1 to white wire
Y to yellow wire
G to green wire
B to blue wire
O to orange wire
From what I can find, W2 is 2nd stage heat pump, which AFIK I don't have, though I could check the model number. X2 on a Trane thermostat is emergency heat which would go to * on the Nest, or so says the internet. The Nest installation site doesn't have anything on the X2 label.
Will this work?
RE: Thermostat Wiring - W2/X2 Pin - Roly - 07-27-2023
(07-27-2023, 07:16 PM)crokett™ Wrote: trying to decide if my upstairs thermostat is compatible with Nest. The existing labeling on the Trane thermostat and wiring isi think this article will answer your question LINK Roly
R to red wire
W2/X2 to black wire
W1 to white wire
Y to yellow wire
G to green wire
B to blue wire
O to orange wire
From what I can find, W2 is 2nd stage heat pump, which AFIK I don't have, though I could check the model number. X2 on a Trane thermostat is emergency heat which would go to * on the Nest, or so says the internet. The Nest installation site doesn't have anything on the X2 label.
Will this work?
RE: Thermostat Wiring - W2/X2 Pin - crokett™ - 07-28-2023
That does help. thanks.
RE: Thermostat Wiring - W2/X2 Pin - crokett™ - 08-19-2023
A redux. I can't use the new Nest. It has spots for 6 wires, my thermostat has 7. The new Nest the * is also labeled O/B. I can use it for either the E heat, or the heat pump heat/cool changeover valve but not both at the same time.