Hi Robert,
If you're just wanting to replace the condenser unit on the rooftop and retain use of your current air distribution box and thermostat then you'll just need to determine what style connector your current unit has. If you remove the cover to the air distribution box and look up you should see a wire harness that hangs down from the condenser and plugs into the controller. It will have either a 6-pin or 9-pin connector (pictured below).
If you have a 6-pin connector then you'll... view full answer...
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