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Replacing a weathertron bay28x139 or bay28x141 with a

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Replacing a weathertron bay28x139...

Replacing a weathertron bay28x139 or bay28x141 with a white-rodgers 1F86-244. after matching all colors from the old weathertron to the new white-rodgers I have two extra wires. (black that it was connected to x2) and (brown that it was connected to T) system isn't working, not sure if this thermostat is compatible or if those two wires need to be connected. or if the whole wiring is wrong. I pull up the instructions for the new thermostat and is very confusing.

Contractor's Assistant: I'll do all I can to help. Is there anything else important you think the HVAC Technician should know?

System was working with the old thermostat but not with the new one

Submitted: 2 years ago.Category: HVAC
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Answered in 45 minutes by:
2/29/2016
HVAC Technician: airheatman, HVAC Technician replied 2 years ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,346
Experience: Furnace, A/C and heat pump specialist.
Verified

Tell me what color wires went to what terminals on old and where you put them on new.

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

If you connected the blue wire from B on old to B on new, you most likely blew a small fuse in the air handler .That B will have to go to C on new.Let me know and we will go from here.

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Give me a few moments to look over

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

OK after looking over the manual on the new thermostat I see that it is not designed to work with your heat pump with backup heat .It will work with the heat pump, but you will not have the electric backup strips if you choose to use this thermostat.It is considered a single stage heat/single stage cool thermostat.You need a 2 stage heat/1 stage cool thermostat.

If you chose to use this thermostat and sacrifice the backup heat ,

You will wire as follows:

Red to RC with jumper to RH (24v power)

Orange to O (Reversing valve)

Green to G (Fan)

Yellow to Y (AC contactor)

All others taped off. Let me know and we will go from here.

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