Wiring Diagrams
The following is just a sample of the most common types of HVAC systems. Refer to your system’s installation manual for wiring information.
CARRIER LOW VOLTAGE TERMINAL BOARD
APRILAIRE MODEL 8355 HEAT PUMP THERMOSTAT CONVERSION TO CARRIER
SPLIT SYSTEM CONDENSORS AND HEAT PUMP SYSTEMS
APRILAIRE MODEL 8355 HEAT PUMP THERMOSTAT
R Y1 O B G E W2 L C Y2
24 VAC, RETURN
R
COMPRESSOR CONTACTOR
Y
REVERSING VALVE [COOLING MODE]
O
FAN CONTACTOR CIRCUIT
G
EMERGENCY HEATING CIRCUIT
E
2ND. STAGE HEATING CIRCUIT
W2
SYSTEM MONITOR LED
L
24 VAC, COMMON
C
W3
THE LOW VOLTAGE TERMINAL DESIGNATIONS AND THEIR DESCRIPTION AND/OR FUNCTION ARE USED ON ALL SPLIT SYSTEM CONDENSORS AND HEAT PUMPS
COLEMAN LOW VOLTAGE TERMINAL BOARD
APRILAIRE MODEL 8355 HEAT PUMP THERMOSTAT CONVERSION TO
ROBERT SHAW 3000 SERIES HEAT PUMP SYSTEMS
APRILAIRE MODEL 8355 HEAT PUMP THERMOSTAT
R Y1 O B G E W2 L C Y2
24 VAC, RETURN
R
COMPRESSOR CONTACTOR
Y
REVERSING VALVE [HEATING MODE]
B
FAN CONTACTOR CIRCUIT
G
EMERGENCY HEATING CIRCUIT
E
2ND. STAGE HEATING CIRCUIT
W2
SYSTEM MONITOR LED
L
24 VAC, COMMON
X
O
THE LOW VOLTAGE TERMINAL DESIGNATIONS AND THEIR DESCRIPTION AND/OR FUNCTION ARE USED ON ALL SPLIT SYSTEM CONDENSORS AND HEAT PUMPS
11
