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R W Y O Gh Gl C
C
Gl
Gh
O
Y
W
R
Rc - 24 VAC, from cooling equipment
Rh - 24 VAC, from heating equipment
W - Heating
C - Common 24 VAC
G - Fan
Y - Cooling
O/B
reversing
valve
Not used
OR
OR
or
PTAC Terminal
Designations
Thermostat Terminal Designations
A08092
Fig. 3 -- Terminal Designations