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FIGURE 4
CONTROL WIRING FOR AIR HANDLER
*Not present on all
air-handler models.
WIRING INFORMATION
Line Voltage
18
13.2 GROUNDING
A grounding lug is provided near the contactor for a ground wire.
WARNING
!
The unit must be permanently grounded. Failure to do so can cause elec-
trical shock resulting in severe personal injury or death.
13.3 CONTROL WIRING
(See Figure 4)
If the low voltage control wiring is run in conduit with the power supply, Class I insu-
lation is required. Class II insulation is required if run separate. Low voltage wiring
may be run through the insulated bushing provided in the 7/8 hole in the base
panel, up to and attached to the pigtails from the bottom of the control box. Conduit
can be run to the base panel if desired by removing the insulated bushing.
A thermostat and a 24 volt, 40 VA minimum transformer are required for the control
circuit of the condensing unit. The furnace or the air handler transformer may be
used if sufficient. See the wiring diagram for reference. Use Table 7 to size the 24
volt control wiring.
Heat Pump Thermostat
Optional Field Installed Jumper (see note 1)
B
Y G W2
OPTIONAL
Air Handler
- 1 STAGE HEAT
WH/BL
W2
GR/BK
G
YL
Y
1
WH/BK
W1
*
B
BL
*
GR/YL
ODD
BR
C
RD
R
* 2
Y
YL/BL
-
Field Installed
-
Factory Standard
TABLE 8
FIELD WIRE SIZE FOR 24 VOLT THERMOSTAT CIRCUITS
(1) Wire length equals twice the run distance.
NOTE: Do not use control wiring smaller than No. 18 AWG between thermostat and outdoor unit.
14.0 FIELD INSTALLED ACCESSORIES
14.1 COMPRESSOR CRANKCASE HEATER (CCH)
While scroll compressors usually do not require crankcase heaters, there are
instances when a heater should be added. Refrigerant migration during the off cycle
can result in a noisy start up. Add a crankcase heater to minimize refrigeration
migration, and to help eliminate any start up noise or bearing "wash out."
NOTE: The installation of a crankcase heater is recommended if the system charge
exceeds the values in Table 9. All 3-phase models come standard with a
crankcase heater factory installed.
E
C
R
Heat Pump
Outdoor Unit
SOLID COPPER WIRE - AWG.
3.0
16
14
2.5
16
14
2.0
18
16
50
100
150
Length of Run - Feet (1)
NOTES:
1. Jumper "E" to "W2" on
thermostat to transfer
control of supplemental
heat to 1st stage when
the emergency heat
switch is on.
2. This wire turns on elec-
tric heat strip during
YL
defrost, omit for most
Y
economical operation.
BL
B
BR
C
WIRE COLOR CODE
R
RD
BK = BLACK
PR
D
BL = BLUE
BR = BROWN
GR = GREEN
PR = PURPLE
RD = RED
WH = WHITE
YL = YELLOW
12
10
10
10
12
12
10
10
14
12
12
10
200
250
300
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