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I have a Trane AC and heat system with a heat pump and a propane backup for the heat. The system came with a Trane non-programmable digital thermostat. I wanted to upgrade to the XL800 thermostat so I purchased 2 new TCONT800 units on Ebay. The wiring doesn't match up and it appears I bought a controller that isn't compatible with my existing system.

Any advice as to whether or not I bought the wrong thermostat. If I do have the right one, I'd appreciate any advice on the wiring. If I bought the wrong won, any advice on which model to buy would be appreciated. Also, if I bought the wrong ones, I have 2 new thermostates for sale at a great price!!

Thanks for any and all advice.

Alan
 

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