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Want to replace a T874R1434 thermostat with aux heat with a visionpro th8000. Have a blue wire connected to the B terminal on old thermostat and what looks like a brown wire connected to the X terminal on old thermostat. Where would these be connected on the visionpro th8000 thermostat.

Answers :

Its kinda difficult to know exactly what the wires could go to considering its all in the way the technician decided to hook them up and everybody has different ideas. I can tell you the most common use of the colors and see if that helps. Depending on how many wires your system has,

Black and Orange wires alternate a lot with different HVAC techs, but usually go to a heat pump system outside.

The best way to get a grip on what wires go where is to look inside the furnace and see where they go. If you have a electrical board, it gets a lot easier, and the back of the furnace door usually has wiring diagrams that are pretty up front about the wiring. Just keep in mind that the wires could have been changed from the thermostat to the furnace, but you can usually tell if the wires seem different. Hope this helps some and good luck!

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Want to replace a T874R1434 thermostat with aux heat with a visionpro th8000. Have a blue wire connected to the B terminal on old thermostat and what looks like a brown wire connected to the X terminal on old thermostat. Where would these be connected on the visionpro th8000 thermostat.

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