Trane to trane mapping help


  #1  
Old 01-09-20, 01:51 PM
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Trane to trane mapping help

So got a new trane thermostat that seems to be setup to be more like other thermostats instead of more like trane's standard and need help with a 'disconnect' on the information I'm able to dig up.

Existing
R W2/X2 (jumped to W1) W1 Y G O B

New
C R W1 W2/0 (zero, not O) Y G

So I believe I need to map it to:

R to R
W2/X2 to W2/0
W1 to W1
Y to Y1
G to G
O and B to C ( this is the bigger question here I believe)

Thoughts?
 
  #2  
Old 01-09-20, 06:23 PM
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Welcome to the forums.

You are asking us to guess.

We need to see a picture of your old wiring on the base.
The old thermostat model number and new thermostat model number.

O and B are typical heat pump letters.
However B on a Trane is the Common terminal.
Typically..... the wire that was on O would go on a O/B terminal and the B wire would be the C.
 
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Old 01-09-20, 08:30 PM
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Attachments

Thank you. The original has the blue wire/B started to be removed, when it occurred to me I needed to document.

Name:  ts1.jpg
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Name:  ts2.jpg
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Last edited by PJmax; 01-09-20 at 08:48 PM. Reason: reoriented/resized pictures
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Old 01-09-20, 08:43 PM
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It looks like the blue should be the C wire for the new stat.

This looks to be a heat pump system with backup heat. Is that correct ?
Can that "new" thermostat control a heat pump ? It doesn't look like it.
 
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Old 01-09-20, 09:20 PM
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That W2/0 is W2/O - Look at the font as W on W1 is wider. You are going to have to read the manual for the new thermostat. Figure out how to configure it for a heat pump rather than conventional. As P mentioned - figure out what you have now. Read the manual for the old thermostat to see how it is configured.
 
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Old 01-10-20, 07:13 PM
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Thank you everyone! Do not have the specs on the old, just bought thr house. But the new, according to its specs, does support heat pumps.

  • Model Number: TZEMT524AA21MA
  • Touchscreen: Touchscreen 4.3Ē diaganal
  • Display: Fixed Segment LCD, 4" x 2.25" with 17 character alpha numeric display
  • Dimensions: 5.7" wide x 3.5" height x 1.2" depth
  • Standard HVAC Systems: 2 stage heating and 1 stage cooling
  • Heat Pump systems: 1 compressor heat with 1 stage aux heat and 1 stage cooling
  • System Type: Standard (gas/electric) and heat pump
  • Power: 24 VAC from HVAC System
​​​​​​
 
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Old 01-20-20, 10:17 AM
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Following up....

Looking for additional insight and/or a little confirmation. I've obviously looked at the manual and aside from the obvious, the ones I'm questioning arent 100% clear in the new manual because I seem to have multiple/dual combos.

Thanks!
 
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Old 01-20-20, 10:54 AM
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Research says....

Contrary to what was said above, where I am getting the combining Blue and Orange, is this article which says its unique to trane which the air handler, pump and both old and new thermostats are....
https://inspectapedia.com/heat/Thermostat_Wiring_Chart.php
 
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Old 01-20-20, 06:57 PM
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On the Inspectapedia page they say "O and B together" - what they mean is that both of the those terminals are in use/have wires connected to them on the same thermostat, not that they are physically connected. Read bottom note #4: "Where B & O appear together"

Also look at page 5 of the thermostat manual (https://www.manualslib.com/manual/87...?page=5#manual) shows B to C, X2 to W1, O to W2/O
 
 

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