Installation and Wiring
Two Stage Heat Pump
See note below
Two Stage Heat Pump wiring
FIG. 9
NOTE: Either the B or O relay will be connected to the reversing valve based on the type of reversing valve used (B is energized for
heating, O is energized for cooling). Connect one or the other. DO NOT CONNECT BOTH.
See the Changing the Type of HVAC System section on page 38 for information on indicating the thermostat is connected to a Two
Stage Heat Pump system.
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ENV-VST-C - Instruction Manual