Trane YHC092E Installation, Operation And Maintenance Manual page 45

Pre-Start
Cool 1
Connect red thermostat wire (R) to yellow thermostat wire
(Y1).
Cool 2
Connect red thermostat wire (R) to yellow thermostat wire
(Y2).
Heat 1
Connect red thermostat wire (R) to brown thermostat wire
(W1).
Heat 2
Connect red thermostat wire (R) to brown thermostat wire
(W2).
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