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Most are fairly universal. Determine if you have a single pole or double pole contactor and see if the parts house will sell you one.

If you know how to read a schematic, it is a piece of cake; if you don't, just remember kill the power to both indoor and outdoor units and to map the wiring before you remove the wires and you should have no problem.

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Q: How do you know what contactor will work on your unit if you have a Trane model TWR042c100b2?
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