Robertshaw 9520 User Manual page 15

ROBERT SHAW HEAT PUMP THERMOSTAT CONVERSION TO LENNOX
HP21 WITH CB21 PCB HEAT PUMP SYSTEMS
24 VAC, RETURN
R-VR
COMPRESSOR CONTACTOR
Y1
REVERSING VALVE [COOLING MODE]
O
FAN CONTACTOR CIRCUIT
F
EMERGENCY HEATING CIRCUIT
E
2ND. STAGE HEATING CIRCUIT
W1
L
24 VAC, COMMON
X
Y2
THE LOW VOLTAGE TERMINAL DESIGNATIONS AND THEIR DESCRIPTION AND/OR
FUNCTION ARE USED ON ALL SPLIT SYSTEM CONDENSORS AND HEAT PUMPS
ROBERT SHAW HEAT PUMP THERMOSTAT CONVERSION TO LENNOX
HP22 WITH CB19 PCB HEAT PUMP SYSTEMS
24 VAC, RETURN
R-VR
COMPRESSOR CONTACTOR
M
REVERSING VALVE [HEATING MODE]
R
FAN CONTACTOR CIRCUIT
F
EMERGENCY HEATING CIRCUIT
E
2ND. STAGE HEATING CIRCUIT
Y
SYSTEM MONITOR LED
L
24 VAC, COMMON
X
2ND. STAGE COOLING CIRCUIT
Y2
THE LOW VOLTAGE TERMINAL DESIGNATIONS AND THEIR DESCRIPTION AND/OR
FUNCTION ARE USED ON ALL SPLIT SYSTEM CONDENSORS AND HEAT PUMPS
ROBERT SHAW HEAT PUMP THERMOSTAT
R O
Y1 B
ROBERT SHAW HEAT PUMP THERMOSTAT
R Y1 O B
15
W2
G E L
W2
G E L
Y2
C
C Y2