CONNECT CONTROL WIRING
Route 24-v control wires through control-wiring grommet and
connect leads to control wiring. (See Fig. 7.)
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 trans-
former for control power, 24-v/40-va minimum.
NOTE: Use of available 24-v accessories may exceed the mini-
mum 40-va power requirement. Determine total transformer load-
ing and increase the transformer capacity or split the load with an
accessory transformer as required.
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
50 ft. Refer to Application Guideline and Service Manual—Air
Conditioners and Heat Pumps Using R-22 Refrigerant.
Step 9—Install Electrical Accessories
Refer to individual instructions packaged with kits or accessories
when installing.
Step 10—Start-Up
Do not vent refrigerant to atmosphere. Recover during system
repair or final unit disposal.
To prevent compressor damage or personal injury, observe
the following:
•Do not overcharge system with refrigerant.
•Do not operate unit in a vacuum or at negative pressure.
•Do not disable low-pressure switch.
In scroll-compressor applications:
•Dome temperatures may be hot.
To prevent personal injury wear safety glasses, protective
clothing, and gloves when handling refrigerant and observe
the following:
•Back-seating service valves are not equipped with Schrader
valves. Fully back seat (counterclockwise) valve stem before
removing gage-port cap.
•Front-seating service valves are equipped with Schrader
valves.
• 3-phase scroll compressors are rotation sensitive.
• A flashing LED on phase monitor indicates reverse rotation.
(See Fig. 6 and Table 3.)
• This will not allow contactor to be energized.
• Disconnect power to unit and interchange 2 field wiring
leads on unit contactor.
Table 2—Accessory Usage
ACCESSORY
REQUIRED FOR
LOW-AMBIENT
APPLICATIONS
(BELOW 55°F)
REQUIRED FOR
LONG-LINE
APPLICATIONS*
(OVER 50 FT)
REQUIRED FOR
SEA COAST
APPLICATIONS
(WITHIN 2 MILES)
Crankcase Heater Yes Yes No
Evaporator Freeze Thermostat Yes No No
Winter-Start Control Yes† No No
Accumulator No No No
Compressor Start-Assist
Capacitor and Relay
Yes Yes No
MotorMaster™ Control,
or
Low-Ambient Pressure Switch
Yes No No
Wind Baffle
See Low-Ambient
Instructions
No No
Coastal Filter No No Yes
Unit Risers Recommended No Recommended
Liquid-Line Solenoid Valve
or
Hard-Shutoff TXV
No
See Long-Line
Application
Guideline
No
Ball-Bearing Fan Motor Yes‡ No No
*For tubing-line sets between 50 and 175 ft, refer to Application Guideline and Service Manual—Air Conditioners and Heat Pumps Using R-22 Refrigerant.
†Only when low-pressure switch is used.
‡Required for low-ambient controller and MotorMaster™ Control only.
Fig. 5—Line Power Connections
A94025
DISCONNECT
PER N.E.C. AND/OR
LOCAL CODES
CONTACTOR
GROUND
LUG
FIELD GROUND
WIRING
FIELD POWER
WIRING
BLUE
3 PHASE ONLY
4
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