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Wall Wire | Thermostat Wire | Terminal | Usage |
---|---|---|---|
White | White | Common | |
Black | Red | Power | |
Red | Brown | Heat | |
Orange | Yellow | Y | AC |
Green | Green | G | Fan |
Marking | Wire Color Code | Description |
---|---|---|
R | Red | Power, 24 Vac transformer |
Rc | Red | Power from cooling, 24 Vac transformer |
Rh | Red | Power from heat, 24 Vac transformer |
C | Black/Blue | Common of 24 Vac transformer |
W | White | Primary heat cell relay |
E | Brown | Emergency heat relay |
Y | Yellow | Primary cool call relay |
Y2 | Yellow | Secondary cool call relay |
G | Green | Fan relay |
O | Orange | Change-over relay to cool relay |
B | Blue | Change-over relay to heat relay |
A | Heat and cool active to any relay | |
L | Emergency heat active lamp | |
X | System malfunction lamp | |
P | Defrost control lamp |
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