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Old 01-29-2014, 01:43 PM   #1
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Trane to Nest thermostat.


Hey guys.

I have 3 1/2 ton Trane heat pump. All electric with aux heat.

Im replacing the thermostat with a Nest gen1. ( i got a smoking deal on it and wife likes it so that why i got it). I have talked to nest customer service through email with pictures to verify if it was compatible and there suggested wiring. Anyways i havent attempted to do anything yet. at first they said it appears to be compatible but needed more pics to verify the x2 wire. Now They think both O and B both control reversing valve. And that B wasnt the common. thus making it incompatible. Can anyone verify this.

Heres some pics...
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Trane to Nest thermostat.-trane-thermo.jpg   Trane to Nest thermostat.-3.jpg   Trane to Nest thermostat.-1.jpg   Trane to Nest thermostat.-2.jpg   Trane to Nest thermostat.-nest-gen1.jpg  

Trane to Nest thermostat.-6.jpg  

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Last edited by tool man Taylor; 01-29-2014 at 03:21 PM.
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Old 01-29-2014, 03:07 PM   #2
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Trane to Nest thermostat.


O controls the reversing valve on Trane and most other makes. B controls it on Rheem/Ruud. The O/B setting is probably selected in the thermostat programming screen on the NEST. It's odd to have 2 B connections and 2 O connections. You may need a Pro to advise you on this one.

EDIT: The B wire in the Trane thermostat pic may not be connected through to the air handler/heatpump.

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Old 01-29-2014, 04:03 PM   #3
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Trane to Nest thermostat.


thanks.

I originally planned to do this:

WIRE - NEST

blue - C
red - RH
white - W1
green - G
orange - OB
yellow - Y1

and leave off X2 as i thought that was emergency heat and Nest1 doesnt support that.


so from the pics can we confirm blue wire is the common?
X2 emergency heat?
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Old 01-29-2014, 07:05 PM   #4
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Trane to Nest thermostat.


The blue wire is the common, and X2 the emergency heat.

Keep your old stat. You may need it.
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Old 01-29-2014, 07:58 PM   #5
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Trane to Nest thermostat.


Thanks.

Not sure what made them think O and B wire both controlled the reversing valve.
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Old 01-29-2014, 09:15 PM   #6
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Trane to Nest thermostat.


Quote:
Originally Posted by tool man Taylor View Post
Thanks.

Not sure what made them think O and B wire both controlled the reversing valve.
They really don't know much about HVAC systems.
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Old 01-29-2014, 11:28 PM   #7
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Trane to Nest thermostat.


Quote:
Originally Posted by beenthere View Post
They really don't know much about HVAC systems.
And they don't know much about making a reliable thermostat either.
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Old 01-30-2014, 09:39 AM   #8
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Trane to Nest thermostat.


Btw i ask Nest Why they thought B was reversing valve as i thought it was the common....and they replied that it was labeled B on the control board instead of C.
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Old 01-30-2014, 04:42 PM   #9
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Trane to Nest thermostat.


B on Rheem/Ruud heat pumps is the reversing valve. They reverse on a heat call instead of a cooling call.

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