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VII−
WIRING DIAGRAM/OPERATING SEQUENCE
A−Field Wiring, Thermostat Connections
HP27 and TYPICAL BLOWER UNIT THERMOSTAT
TERMINAL DESIGNATIONS
EMERGENCY HEAT
COMMON
POWER
1ST STAGE AUX. HEAT
INDOOR BLOWER
T
L
O
Y1
E
C
W2
R
W1
G
2ND STAGE AUX. HEAT
E
C
W2
R
W1
G
AMBIENT SENSOR
SERVICE LIGHT
REVERSING VALVE
COMPRESSOR
COMMON
POWER
DEFROST SENSING
T
L
O
Y1
C
R
W1
HP27
Thermostat
Indoor
Blower Unit
B−Field Wiring, Thermostat Connections
FIELD WIRING DIAGRAM HP27 WITH INDOOR UNIT
1
2
3
THERMOSTAT HEAT ANTICIPATION SET-
TING .4 AMP ELECTRIC HEAT.
WHEN TWO−STAGE THERMOSTAT IS USED,
CONNECT SECOND−STAGE HEAT BULB TO TER-
MINAL W2" AND REMOVE JUMPER BETWEEN
TERMINALS R" AND W2."
WHEN OUTDOOR THERMOSTAT IS USED,
CONNECT LEADS TO TERMINALS R" AND
W2’’ AND REMOVE JUMPER BETWEEN
TERMINALS R" AND W2."
DENOTES OPTIONAL COMPONENT
T
L
O
Y1 E C V/R R W1 G
T
L
C
R
W1
Y1
O
4
3
K22
S23
K1
C12
4
EMERGENCY HEAT RELAY (USED ONLY
IF OUTDOOR THERMOSTAT IS USED)
FIELD PROVIDED AND INSTALLED NEAR
INDOOR UNIT. 24 VAC, 5VA MAX. NEC
CLASS 2.
LINE VOLTAGE FIELD INSTALLED
CLASS II 24V FIELD INSTALLED
DEFROST CONTROL
