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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. 9.
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
FIELD POWER
WIRING
FIELD GROUND
WIRING
Fig. 8 --- — Line Power Connections
CONNECT CONTROL WIRING
Route 24- -v control wires through control wiring grommet and
connect leads to control wiring.
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
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
loading 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 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.
CONTACTOR
GROUND
LUG
A91056
STEP 10. —Start- -Up
CAUTION
!
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.
CAUTION
!
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.
CAUTION
!
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.
Follow these steps to properly start up the system:
1. After system is evacuated, fully open liquid and vapor
service valves.
2. Unit is shipped with valve stem(s) front seated (closed)
and caps installed. Replace stem caps after system is
opened to refrigerant flow. Replace caps finger- -tight and
tighten with wrench an additional 1/12 turn.
3. Close electrical disconnects to energize system.
4. Set room thermostat at desired temperature. Be sure set
point is below indoor ambient temperature.
5. Set room thermostat to COOL and fan control to ON or
AUTO mode, as desired. Operate unit for 15 minutes.
Check system refrigerant charge.
8
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