Bryant 597C instruction manual VII. Make Electrical Connections, VIII. Compressor Crankcase Heater

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

UNIT	LIQUID		VAPOR		VAPOR (LONG LINE)
SIZE	Connection Diameter	Tube Diameter	Connection Diameter	Tube Diameter	Connection Diameter	Tube Diameter
018, 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, consult Residential Long-Line Application Guideline.

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

For buried-line applications greater than 36 in., consult your local distributor.

If refrigerant tubes or indoor coil are exposed to atmosphere, they must be evacuated to 500 microns to eliminate contamination and moisture in the system.

A.Outdoor Unit Connected to Factory-Approved In- door Unit

Outdoor unit contains correct system-refrigerant charge for opera- tion with indoor unit of same size when connected by 15 ft of field-supplied or factory-accessory tubing. Check refrigerant charge for maximum efficiency.

B. Refrigerant Tubing

WARNING: The unit cabinet must have an uninter- rupted or unbroken ground to minimize personal injury if an electrical fault should occur. The ground may consist of electrical wire or metal conduit when installed in accordance with existing electrical codes. Failure to follow this warning can result in an electric shock, fire, or death.

B. 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. 4.

Connect tubing to fittings on outdoor unit vapor- and liquid- service valves. (See Table 1.) Use refrigerant-grade tubing.

C. Sweat Connection

CAUTION: To avoid valve damage while brazing, ser- vice valves must be wrapped in a heat-sinking material, such as a wet cloth.

Service valves are closed from factory and ready for brazing. After wrapping service valve with a wet cloth, tubing set can be brazed to service valve using either silver-bearing or non-silver-bearing brazing material. Consult local code requirements. Refrigerant

DISCONNECT

PER N. E. C. AND/OR LOCAL CODES

FIELD POWER

WIRING

FIELD GROUND

WIRING

CONTACTOR

GROUND

LUG

A91056

tubing and indoor coil are now ready for leak testing. This check should include all field and factory joints.

VII. MAKE ELECTRICAL CONNECTIONS

WARNING: To avoid personal injury or death, do not supply power to unit with compressor terminal-box cover removed.

Be sure field wiring complies with local and national fire, safety, and electrical codes, and voltage to system is within limits shown on unit-rating plate. Contact local power company for correction of improper voltage. See unit-rating plate for recommended circuit- protection device.

NOTE: Operation of unit on improper line voltage constitutes abuse and could affect unit reliability. See unit-rating plate. Do not install unit in system where voltage may fluctuate above or below permissible limits.

NOTE: Use copper wire only between disconnect switch and unit.

NOTE: Install branch-circuit disconnect of adequate size per NEC to handle unit-starting current. Locate disconnect within sight from and readily accessible from unit, per Section 440-14 of NEC.

A. Route Ground and Power Wires

Remove access panel to gain access to unit wiring. Extend wires from disconnect through power wiring hole provided and into unit-control box.

Fig. 4—Line Power Connections

C. Connect Control Wiring

Route 24v control wires through control-wiring grommet and connect leads to control wiring. (See Fig. 5.)

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, 24v/40va minimum.

NOTE: Use of available 24v accessories may exceed the mini- mum 40va power requirement. Determine total transformer load- ing and increase the transformer capacity or split the load with an accessory transformer as required.

→ IMPORTANT: Check factory wiring and wire connections to ensure terminations are secured properly. Check wire routing to ensure wires are not in contact with tubing, sheet metal, etc.

VIII. 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 Residential Split-System Long-Line Application Guideline.

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