Carrier 38BYC, 38BYG instruction manual Make Electrical Connections

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	3/8	3/8	5/8	5/8	5/8	3/4
024	3/8	3/8	3/4	3/4	3/4	3/4
030, 036	3/8	3/8	3/4	3/4	3/4	7/8
042	3/8	3/8	7/8	7/8	7/8	1-1/8
048, 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.

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

OUTDOOR UNIT CONNECTED TO FACTORY APPROVED INDOOR 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.

REFRIGERANT TUBING

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

SWEAT CONNECTION

To avoid valve damage while brazing, service valves must be wrapped in a heat sink material such as a wet cloth.

Remove plastic retainer holding outdoor piston in liquid service valve and connect sweat/flare adapter provided to valve. (See Fig. 7.) Connect refrigerant tubing to fittings on outdoor unit vapor- and liquid-service valves. 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 tubing and indoor coil are now ready for leak testing. This check should include all field and factory joints.

PISTON BODY

PISTON

PISTON

RETAINER

STRAINER

SWEAT/FLARE ADAPTER

A97512

Fig. 7—Liquid-Service Valve

IMPORTANT: Check to be certain factory tubing on both indoor and outdoor unit has not shifted during shipment. Ensure tubes are not rubbing against each other or any sheet metal. Pay close

attention to feeder tubes, making sure wire ties on feeder tubes are secure and tight.

Step 10—Make Electrical Connections

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.

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.

The unit cabinet must have an uninterrupted 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.

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. 8.

CONNECT CONTROL WIRING

Route 24v control wires through control wiring grommet and connect leads to control wiring. See Thermostat Installation Instructions for wiring specific unit combinations. (See Fig. 9.)

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.

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