The crankcase heater, when furnished, is energized whenever
the compressor is not running. Check for proper operation by
feeling for heat on the compressor where the heater is installed.
The heater should be energized for at least 8 hours before the
thermostat is set to operate the compressor.
CAUTION: An attempt to start the compressor without at least
8 hours of crankcase heat will damage the com-
pressor.
A warning label with an adhesive back is supplied in the unit
installation instruction packet. This label should be attached to
the field supplied disconnect switch where it will be easily seen.
See below:
O
66
W
B
Y
7 WIRES
GRD.
LUG
DEFROST
CONTROL
CONTACTOR
GRD.
SCREW
M
T1
L1
L 2
R
X
5 3
R
6 0
6 6
G
O
B
X
W
Y
R
G
O
B or C
L or X
W
Y
7 WIRES
OUTDOOR UNIT
THERMOSTAT
INDOOR UNIT
T2
POWER WIRING
208/230-1-60
POWER WIRING
24V CONTROL WIRING
(NEC CLASS 2)
CIRCUIT
THERMOSTAT
Jumper terminals E and W to heat
on first stage during Emergency Heat.
LOW VOLTAGE TERMINAL BLOCK
IN AIR HANDLER WITH ELECTRIC HEAT
Check the low voltage terminal block on the indoor unit for the actual arrangement of the terminals.
BREAKER***
ALL WIRING TO BE IN ACCORDANCE WITH NATIONAL ELECTRIC CODE AND/OR LOCAL CODES
Connect power wiring to terminal block 3TB on units without electric heat or units without a circuit breaker..
T
E
FIELD
INSTALLED
JUMPER
1
3,4
1
2
2
3
4
Terminal not used on all thermostats.
2
THERMISTOR
FIGURE 3 - TYPICAL FIELD WIRING (AIR HANDLER WITH ELECTRIC HEAT)
IF POWER HAS BEEN OFF FOR 8 HOURS OR LONGER,
DISCONNECT SWITCH MUST BE TURNED ON 8 HOURS
BEFORE THERMOSTAT IS SET TO “HEAT”, “COOL” OR
“AUTO”.
IMPORTANT
035-03095A
515.26-N1Y
4
Central Environmental Systems
