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On our 2013 3750FL (Front Living room), the thermostat is a Comfort Control II (next generation of the ones shown in the above posts). Zone 1, the one that also controls the Heat is the Bedroom, and Zone 2 (Cool Only) is the Living room.
From my understanding of the installation instructions, the Thermostat is some sort of serial hookup and each A/C Unit has switches to set the Zone Number. I also think, the Heat wires are connected to the board in the Zone 1 Unit.
This would imply that the Zone settings can not be changed without moving the Heat control wires.
Just my two cents...
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