8
CONNECT GROUND AND POWER
WIRES
Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 8.
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
CONTACTOR
GROUND
LUG
FIELD GROUND
WIRING
FIELD POWER
WIRING
A91056
Fig. 8 --- Line Power Connections
CONNECT CONTROL
WIRING
Route 24--v control wires through control wiring grommet and
connect leads to control wiring. (See Fig. 13 & Fig. 14)
Use No. 18 AWG color-- coded, insulated (35_C minimum) wire.
If thermostat is located more than 100 ft. from unit, as measured
along the control voltage wires, use No. 16 AWG color-- coded,
insulated wire to avoid excessive voltage drop.
All w irin g mu st b e NE C Class 1 and must be sep arated from
incoming power leads.
Use furnace transfo rm er, fan co il transform er, or accessory
transformer for control power, 24--v/40--va minimum.
NOTE: Use of available 24--v accessories may exceed the
minimum 40 -- va power requirement. Determine total transformer
load and increase the transformer capacity or split the load with
an accessory transformer as required.
FINAL WIRING
CHECK
IMPORTANT: Check factory wiring and field wire connections
to ensure terminations are secured properly . Check wire routing
to ensure wires are not in contact with tubing, sheet metal, etc.
STEP 8 —CompressorCrankcaseHeater
When equipped with a crankcase heater , furnish power to heater a
minimum of 24 hr before starting unit. To furnish power to heater
only, set t h erm o stat to OF F and close electrical d isco n nect to
outdoor unit.
A crankcase heater is required for low--ambient cooling or if
refrigerant tubing is longer than 80 ft. Refer to the Longline
Guideline Section -- Residential Split--System Air Conditioners
and Heat Pumps Using Puronr Refrigerant.
STEP 9 —Install Electrical Accessories
Refer to the individual instructions packaged with kits or
accessories when installing.
STEP 10 —Check OAT Thermistor and OCT Thermistor
Attachments
Outdoor Air Temperature (OAT) Thermistor is factory installed
by inserting the nibs on either sides of the thermistor body
through a keyhole in the bottom shelf of the control box and
locking it in place by turning it 90 degrees, such that the spherical
end of a nib faces the front of the control box.
Check to make sure the OAT is locked in place. See Fig. 9.
OAT Thermistor must be locked in
place with spherical nib end facing to-
wards the front of the control box
A06313
Fig. 9 --- Outdoor Air Thermistor (OAT) Attachment
The Outdoor Coil Temperature (OCT) Thermistor is factory
installed on the liquid tube between the coil assembly and the
liquid service valve. See Fig. 10.
Check to make sure the thermistor is securely attached on the
liquid tube with the clip as shown in Fig. 10.
OCT Thermistor must be secured tight
on the liquid tube.
A05409
Fig. 10 --- Outdoor Coil Thermistor (OCT) Attachment
163A / 165A
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