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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 wiring must be NEC Class 1 and must be separated from
incoming power leads.
Use furnace transformer, fan coil transformer, 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 —Compressor Crankcase Heater
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 thermostat to OFF and close electrical disconnect 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 towards the front
of the control box
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.
Fig. 10 --- Outdoor Coil Thermistor (OCT) Attachment
STEP 11 —Start- -Up
!
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in minor personal
injury, equipment damage or improper operation.
To prevent compressor damage or personal injury, observe the
following:
S Do not overcharge system with refrigerant.
S Do not operate unit in a vacuum or at negative pressure.
S Do not disable low pressure switch in scroll compressor
applications.
S Dome temperatures may be hot.
!
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal
injury.
Wear safety glasses, protective clothing, and gloves when
handling refrigerant and observe the following:
S Front seating service valves are equipped with Schrader
valves.
!
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental
damage.
Federal regulations require that you do not vent refrigerant
to the atmosphere. Recover during system repair or final
unit disposal.
A06313
8
OCT Thermistor must be
secured tight on the liquid tube.
CAUTION
CAUTION
CAUTION
A05409
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