Trane xe1200 common wire location and color

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  #1  
Old 10-14-20, 12:29 AM
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Trane xe1200 common wire location and color


Trane xe1200 unit side t-stat plug
Hello, I have a trane xe1200 roof mount unit with heat pump. I am trying to add a smart thermostat but I cannot find a “white” common wire in the board up in then unit.

Normally you would find a t-stat wire block section with matching letters to simply add the common wire, but this unit has a “plug/socket” instead that connects into the board but it has no lettering/ diagram to describe the wires.

Is anyone familiar with unit and could advise on the color or location of the common wire. Thanks a million!

wire colors at socket plug:
red -used = Red t-stat
yellow -used. = yellow t-stat
orange -used = blue t-stat
black - used = green t-stat
blue - not used/hooked up
brown 1- not used/hooked up
brown 2 - not used/hooked up
brown 3 - not used/hooked up
 
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Old 10-14-20, 07:40 AM
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Hi, do you see a transformer there? it’s hard to tell from the pic .
Geo🇺🇸
 
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Old 10-14-20, 08:15 AM
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Not making sense to me. That is a defrost control board for a heat pump. You don't connect the thermostat to it - you connect the thermostat to the air handler and then wire the air handler to the heat pump.

That said, if you look at the board there is a "B" next to the blue wire so that is common. Trane uses B instead of C labeling.
 
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Old 10-14-20, 11:27 AM
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Additional pics

Thank you for the input. I followed the t-stat leads back to that socket. I am adding some additional pics for reference.

when you say the blue wire has a “B”, whee do you see that?





 
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Old 10-14-20, 12:58 PM
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Hi, there is a transformer on the left side of that cabinet, it should have 4 terminals , 2 will be 120VAC and 2 should be 24 VAC , do you have a meter? one side of the 24 volts should be Common “B” , it may also connected to cabinet, is there a wiring Dia. You can post?





Geo🇺🇸
 
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Old 10-14-20, 03:18 PM
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Is this a packaged heat pump system...... everything is on the roof ?
I'm seeing this as a split system.
That means your thermostat wiring is not there..... it's located inside where the air handler is.
 
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Old 10-15-20, 07:15 AM
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Confusion as XE 1200 is normally used for split systems.

From model number (WCP048F100AA) that is a packaged unit. Literature shows that there should be a loose blue common (B) in the lower section. You can see it in the pic with the thermostat wires there is an unused blue wire there.

https://www.trane.com/webcache/wcp-iom-1e_12012003.pdf
 
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Old 10-15-20, 03:22 PM
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Thanks for the clarification A.


 
 

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