Trane Thermostat XR401 replacement (NEST)

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  #1  
Old 07-24-19, 11:31 AM
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Trane Thermostat XR401 replacement (NEST)

I am trying to replace my Trane Thermostat XR401 with a Nest 3rd Gen.

It is a 7 wire carriage. I will post pictures of the original thermostat wiring as well as a picture of the Air Handler terminals.

I noticed that the Brown wire (Connected to W2/X2 on Thermostat) is just left unconnected in the Air Handler.

Full Air Handler Model:
4TEE3F39A1000AA

I have seen many posts here that says to connect the blue wire ("B" on Tran t-stat) to the "C" on Nest T-Stat.

Here is what I think the wiring might need to be, but I'm hoping for some confirmation before a kill something!

Trane -> Color -> Nest
R -> Red -> Rc
W2 -> Brown -> W2
W -> White -> W1
Y -> Yellow -> Y1
G -> Green -> G
O -> Orange -> O/B
B -> Blue -> C
 
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Old 07-24-19, 11:37 AM
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Pictures

Attached are (hopefully) a bunch of pictures!

Name:  ac1.jpg
Views: 223
Size:  99.4 KB

Name:  ac2.jpg
Views: 226
Size:  141.0 KB
 

Last edited by PJmax; 07-24-19 at 09:14 PM. Reason: resized pictures
  #3  
Old 07-24-19, 09:19 PM
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Welcome to the forums.

A lot of pictures are not needed. You have a 10mb picture storage limit. You were over 25mb. Pictures must be resized to 600x600 and file size under 100kb.

Your wiring is fine. That terminal block is a mess. The rust and corrosion needs to be cleaned up. If the brown wire is not connected...... don't use it. Most electric reheats are on one line..... W or W1.

Turn the air handler before changing the wiring.
 
 

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