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XI. START-UP

CAUTION: 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 vent refrigerant to atmosphere. Recover during

system repair or final unit disposal.

•Do not disable low-pressure switch.

In scroll-compressor applications:

•Dome temperatures may be hot.

CAUTION: 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.

CAUTION: • 3-phase scroll compressors are rotation

sensitive.

• A flashing LED on phase monitor indicates reverse

rotation. (See Fig. 10 and Table 3.)

• This will not allow contactor to be energized.

• Disconnect power to unit and interchange 2 field wiring

leads on unit contactor.

Follow these steps to properly start up the system.

1. After system is evacuated, fully back seat (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.

TABLE 1—REFRIGERANT CONNECTIONS AND RECOMMENDED LIQUID LINE AND VAPOR TUBE DIAMETERS (IN.)

UNIT

SIZE

LIQUID VAPOR VAPOR (LONG LINE)

Connection Diameter Tube Diameter Connection Diameter Tube Diameter Connection Diameter Tube Diameter

018 3/8 3/8 5/8 5/8 5/8 5/8

024 3/8 3/8 5/8 5/8 5/8 3/4

030, 036 3/8 3/8 3/4 3/4 3/4 7/8

042, 048 3/8 3/8 7/8 7/8 7/8 1-1/8

060 3/8 3/8 7/8 1-1/8 7/8 1-1/8

NOTES:

1. Tube diameters are for lengths up to 50 ft. For tubing lengths greater than 50 ft horizontal, or greater than 20 ft vertical differential, consult the Application Guideline and

Service Manual—Air Conditioners and Heat Pumps Using Puron® Refrigerant.

2. Do not apply capillary tube indoor coils to these units.

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,

Low-Ambient Pressure Switch

Yes No No

Wind Baffle See Low-Ambient Instructions No No

Coastal Filter No No Yes

Support Feet Recommended No Recommended

Liquid-Line Solenoid Valve

Hard Shutoff TXV

See Long-Line

Application

Guideline

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 Puron® Refrigerant.

† Only when low-pressure switch is used.

‡ Required for low-ambient controller (full modulation feature) and MotorMaster® Control only.

Fig. 9—Line Power Connections

A94025

DISCONNECT

PER N.E.C. AND/OR

LOCAL CODES

CONTACTOR

GROUND

LUG

FIELD GROUND

WIRING