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Figure 2
type reversing valve connecting to an EWC base plate.
Figure 2 Single-Stage Heat Pump HVAC Connections
Note: A heat pump is either a reverse for heat "B" or reverse for cool "O" model. The Ultra-Zone
IZT-100 uses Y2 for reverse cool and W2 is used for reverse heat.
Ultra-Zone Internet Zone Thermostat Installation Guide, Release 1.0
Part No. 600-01100-100, Rev. 1
shows an example of a Single-Stage Heat Pump HVAC system, with a "B"
HVAC System
Cool &
Reverse for
Fan
Heat
Heat "B"
Control
Power
W2
G
RH
Ca
Installing and Wiring the Thermostat
Auxiliary
Compressor
Heat
W1
Y1
Wire
EWC Base Plate
7
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