Help with Replacing Trane Baystat 339 with a Blue 1F95-1277


Old 06-29-19, 01:20 PM
Thread Starter
Join Date: Jun 2019
Location: United States
Posts: 2
Question Help with Replacing Trane Baystat 339 with a White-Rodgers 1F95-1277

I'm looking for help replacing my thermostat, and making sure it is wired properly. I currently have a Trane Baystat 339 (Reads Trane with Weatherton Heat Pump w/ Aux Heat and Em heat LED's) and want to replace it with a White-Rodgers Model 1F95-1277.

The label on my unit is old and is partially covered with paint spray, the only legible info I can see that helps is Trane Serial No S12365933.

The red and white wire loops on the Blue were hooked up like that when I got it, from a different system. I've been doing a lot of reading but would appreciate any help in making sure I wire this correctly.

The way it's wire to the Trane Baystat339 Now:

W - White
G - Green
X2 - Black
R - Red
O - Orange
Y- Yellow
T- Brown
B - Blue
F- Nothing
U- Nothing

The Blue 1F95-1277 Uses the following Wiring Option:

B, O, Y2, Y, G, RC, RH, C, +, S, -, W2, W/E, 6, L.

The RC & RH, and W2 & W/E connectors are jumped together from a different unit the Blue came from - My parent's house, they're HVAC guys said it would be compatible with my unit.
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Last edited by VulcanBrady; 06-29-19 at 02:24 PM.
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Old 06-29-19, 08:16 PM
Join Date: Jun 2012
Location: USA
Posts: 1,401
Upvotes Received: 11
Need to program as HP1 -

Remove white loop. Leave red loop as is.

W - White -> W/E
G - Green -> G
X2 - Black -> W2
R - Red -> RC (leave in jumper to RH)
O - Orange -> O
Y- Yellow -> Y
T- Brown - no connection
B - Blue -> C
F- Nothing
U- Nothing
Old 06-30-19, 12:52 AM
Thread Starter
Join Date: Jun 2019
Location: United States
Posts: 2
Thank you very much Astuff!. Seems I wasn't too far off with the wiring. I programmed it as HP1, and wired it up. everything seems to be working properly. I really appreciate the help

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