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If the thermostats are wired using a CANBUS then the HP should have been on the largest zone.. typically the LR and the two blue signal wires for the furnace should be on the zone 1 roof AC control board and run down to furnace control board.
If the unit is using one thermostat or In Command to control HVAC operation then a CANBUS is in use...
If there are two separate thermostats then CANBUS is not being used
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