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19
Auxiliary
Switch
Single Transformer
Connection Schematic
WHITE
YELLOW
RED
GREEN
BLUE
R
G
W
Y
C
R
G
W
Y
C
Thermostat
HVAC Equipment
Signal Coupler
Legend
R – 24VAC
C – Common
W – Heating
Y – Cooling
G – Fan
Example for single stage
Heat/Cool system.
G
R
W
Y
Labels per steps 1 and 6.