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Installation and Wiring
12
ENV-VST-C - Operation / Reference Guide
Two Stage Heat Pump
See the Changing the Type of HVAC System section on page 40 for information on indicating the thermostat is connected
to a Two Stage Heat Pump system.
FIG. 9 Two Stage Heat Pump wiring
See note below
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.