Replacing a Trane Tatstat540 thermostat with a Honeywell RTH9580 Wi-Fi

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Old 05-09-17, 09:08 AM
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Replacing a Trane Tatstat540 thermostat with a Honeywell RTH9580 Wi-Fi

I'm new to the forum and I'd appreciate some advice. I noticed a similar post dating back to 2013 but all it did was confuse me more.
My equipment:
Taystat 540
Trane XL1400 Heat Pump model WCY048G100AD
Honeywell TRH9580WF thermostat (not yet purchased)

My basic problem (I think) is that I need a C wire.

The Taystat has the following contacts/wires:
Green G
Black B
Red R
Yellow Y
F No connection
White W Jumper to X2
X2
Orange O

The Honeywell unit has the following contacts:
Honeywell: C, K, Rc, R, W-O/B, Y, G, W2-AUX/E, Y2, L.

My question is: Is there a way my existing wires can do the job without running a deparate C wire, is so how would I connect them? Thank you and any advice would be greatly appreciated.
 
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Old 05-09-17, 09:21 AM
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Welcome to the forums.

On a Trane system..... B is the Common wire.

Turn power off to air handler before changing wiring.
Follow heat pump designations on new stat
Trane---> color-------->9580
G ------> Green-------> G
B-------> Black--------> C
R-------> Red---------> R - Rc (leave jumper intact)
Y-------> Yellow-------> Y
O------> Orange------> O/B
W-----> White--------> AUX/E

Configure the stat for O in A/C mode (should already be set there)
Set stat for back up electric heat.
 
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Old 05-09-17, 10:26 AM
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Thank you very much! I feel much more confident that I can install the new thermostat. Two quick questions:
What would the F terminal be for (I realize I'm not currently using it), and could you amplify your statement "Configure the stat for O in A/C mode". Thank you again.
 
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Old 05-09-17, 10:31 AM
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You have a heat pump with reversing valve.

O mode is the most common. It means valve is powered in A/C mode.
B mode is used for Rheem and Ruud units. The valve is powered in the heat mode.

F could mean filter. A light would come on to signify filter replacement.
 
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Old 05-09-17, 10:52 AM
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Thank you again! You are an invaluable resource.
 
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Old 05-13-17, 11:52 AM
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PJMAX (Pete)

Installed the stst this morning and your instructions were perfect. Thank you again.
Peter
 
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