Carrier 38TRA ÐLine Power Connections, ÐMake Electrical Connections, ÐStart-up, ÐChecking Charge

bearing brazing material. Consult local code requirements. Refrig- erant tubing and indoor coil are now ready for leak testing. This check should include all field and factory joints.

Step 5ÐMake Electrical Connections

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. (See Fig. 2.)

NOTE: Operation of unit on improper line voltage constitutes abuse and could affect unit reliability. See unit rating plate.

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

NOTE: Install branch circuit disconnect per NEC of adequate size to handle unit starting current, but not larger than maximum fuse size shown on unit rating plate. Locate disconnect within sight from and readily accessible from unit, per Section 440-14 of NEC.

ROUTE GROUND AND POWER WIRES Ð Remove access panel and control box cover to gain access to unit wiring. Extend wires from disconnect through power wiring hole provided and into unit control box. (See Fig. 2.) Size wires per NEC but not smaller than minimum wire size shown in presale literature.

The cabinet must have an uninterrupted or unbroken ground according to NEC, ANSI/NFPA 70-1993 or local codes to minimize personal injury if an electrical fault should occur. This may consist of electrical wire or conduit approved for electrical ground when installed in accordance with existing electrical codes. Failure to follow this warning could result in an electrical shock, fire, or death.

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

CONNECT GROUND AND POWER WIRES Ð Connect ground wire to ground connection in control box for safety. Connect power wiring to contactor as shown in 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.

Use furnace transformer, fan coil transformer, or accessory trans- former for control power, 24-v/40va 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 6ÐInstall Electrical Accessories

Refer to the individual instructions packaged with the kits or accessories when installing.

Step 7ÐStart-up

1.Fully back seat (open) liquid and vapor service valves.

2.Unit is shipped with valve stem(s) front seated and caps installed. Replace stem caps after system is opened to refrig- erant flow (back seated). Replace caps finger tight and tighten additional 1/6 turn with wrench.

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 at COOL and fan switch at FAN or AUTO, as desired. Operate unit for 15 minutes. Check system refrigerant charge. (See Step 8ÐChecking Charge.)

Step 8ÐChecking Charge

Factory charge is shown on unit rating plate. (See Fig. 2.)

Do not disable low-pressure switch during a condenser pump down. Compressor damage may occur if run at a negative suction pressure.

Compressor damage may occur if system is overcharged.

Service valve gage ports are not equipped with Schrader valves. To prevent personal injury, make sure valves are fully back seated before removing gage port caps. Wear safety glasses and gloves when handling refrigerant.

DISCONNECT

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

FIELD POWER

WIRING

FIELD GROUND

WIRING

CONTACTOR

GROUND

LUG

A91056

Adjust charge by following procedure shown on the superheat charging tables located on unit information plate.

Do not vent refrigerant to atmosphere. Recover during system repair or final unit disposal.

CARE AND MAINTENANCE

For continuing high performance and to minimize possible equip- ment failure, it is essential that periodic maintenance be performed on this equipment. Consult your servicing contractor or User's Manual for the proper frequency of maintenance. Frequency of maintenance may vary depending upon geographic areas, such as

Fig. 5ÐLine Power Connections

CONNECT CONTROL WIRING Ð Route 24-v control wires through control wiring grommet and connect to brown and blue pigtails supplied in unit splice box. (See Fig. 6.)

coastal applications.

Step 1ÐLeave User's Manual With Homeowner

Explain system operation and maintenance procedures outlined in User's Manual.

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