Page 10
506150−01 05/09
CIRCUIT 1
CIRCUIT BREAKERS
OR TERMINAL BLOCK
1
4
7
3
6
9
NOTE − USE COPPER CONDUCTORS ONLY.
REFER TO UNIT RATING PLATE FOR MINIMUM
CIRCUIT AMPACITY AND MAXIMUM OVERCUR-
RENT PROTECTION SIZE.
LINE VOLTAGE FIELD INSTALLED
CLASS 2 VOLTAGE FIELD INSTALLED
NEC/CEC
NOTE − ALL REMAINING WIRES ARE FACTORY
INSTALLED
TO EXTERNAL LOAD 24VAC AT .50 AMP MAXI-
MUM.
THERMOSTAT HEAT ANTICIPATION SETTING 0.4
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."
FACTORY INSTALLED JUMPERS
L3 CONNECTION USED ON (Y−VOLTAGE)
3−PHASE ELECTRIC HEATERS ONLY.
CB1
CIRCUIT
BREAKER
OR
FUSE
Figure 11. Typical Field Wiring − Cooling Application with Electric Heat
C
W1 O Y1 R
L
T
E C W1 G O Y1 R L T
SERVICE LIGHT
THERMISTOR
Y2
Y2
2ND STAGE COMPRESSOR
1
2
3
4
5
6
COMMON
ELECTRIC HEAT
REVERSING VALVE
COMPRESSOR
POWER
1
4
7
3
6
9
LINE VOLTAGE FIELD INSTALLED
CLASS 2 VOLTAGE FIELD INSTALLED NEC/CEC
NOTE − ALL REMAINING WIRES ARE FACTORY INSTALLED
TO EXTERNAL LOAD 24VAC AT .50 AMP MAXIMUM
FACTORY INSTALLED JUMPERS
Y2 USED ONLY WHEN TWO SPEED COMPRESSOR IS USED (HP21).
USING SERVICE LIGHT OPTION (S54) WITH SOME ELECTRONIC
THERMOSTATS MAY REQUIRE MOVING S54 COMMON WIRE TO Y1
IN HEAT PUMP UNIT.
COMMON USED ONLY ON SOME THERMOSTATS.
AMBIENT COMPENSATING THERMISTOR CONNECTION USED ONLY
ON SOME THERMOSTATS.
CIRCUIT 1
HEAT PUMP CLASS 2
VOLTAGE TERMINALS
CB1
CIRCUIT
BREAKER
OR FUSE
CIRCUIT BREAKERS
OR TERMINAL BLOCK
Figure 12. Typical Field Wiring − Heat Pump Only Application
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