Honeywell Heat/1Cool User Guide - Page 14
Equipment Function, Equipment, Terminals, PC8900 - heat cool
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HEAT PUMP THERMOSTAT CROSS REFERENCE/SELECTION GUIDE Equipment Equipment Function Terminals Transformer Common C Power R Fan G 1st Stage Heating W1 1st Stage Cooling Y1 Changeover Valve B PC8900 Terminals C R G O/B Y1/W1 2nd Stage Heating W2 Aux. Emergency Heat E E 2nd Stage Cooling Y2 Y2 M13233 Fig. 12. Relay wiring connections for PC8900 in heat pump applications requiring separate Y1 and W1 terminals with a heating changeover. Equipment Equipment Function Terminals Transformer Common C Power R Fan G 1st Stage Cooling Y1 1st Stage Heating W1 Changeover Valve O PC8900 Terminals C R G O/B Y1/W1 2nd Stage Heating W2 Aux. Emergency Heat E E 2nd Stage Cooling Y2 Y2 M13234 Fig. 13. Relay wiring connections for PC8900 in heat pump applications requiring separate Y1 and W1 terminals with a cooling changeover. 70-6627 • 12