Carrier 60 Service Manual download pdf (Page 32)

3-4

T--295

Table 3 -3 General System Troubleshooting Procedures

INDICATION/

TROUBLE

POSSIBLE CAUSES

REFERENCE

SECTION

3.3.1 System Will Not Cool

Compressor will not run Active system alarm

V-Belt loose or defective

Clutch coil defective

Clutch malfunction

Compressor malfunction

3.2

Check

Check/Replace

See Table 1-2.

Electrical malfunction Coach power source defective

Circuit Breaker/safety device open

Check/Repair

Check/Reset

3.3.2 System Runs But Has Insufficient Cooling

Compressor V-Belt loose or defective

Compressor valves defective

Check

See Table 1-2.

Refrigeration system Abnormal pressures

No or restricted evaporator air flow

Expansion valve malfunction

Restricted refrigerant flow

Low refrigerant charge

Service valves partially closed

Safety device open

Liquid solenoid valve stuck closed

3.3.3

3.3.6

3.3.7

4.11

4.8

Open

1.6

Check

Restricted air flow No evaporator air flow or restriction 3.3.6

Heating system Heat valve s tuck open 3.3.8

3.3.3 Abnormal Pressures

High discharge pressure Discharge t ransducer failure

Refrigerant overcharge

Noncondensable in system

Condenser motor failure

Condenser coil dirty

Replace

4.8.1

Check

Clean

Low discharge pressure Discharge transducer failure

Compressor valve(s) worn or broken

Low refrigerant charge

See Note.

See Table 1-2.

4.8

High suction pressure Compressor valve(s) worn or broken See Table 1-2.

Low suction pressure Suction service valve partially closed

Filter-drier inlet valve partially closed

Filter-drier partially plugged

Low refrigerant charge

Expansion valve malfunction

Restricted air flow

Suction transducer failure

Open

Check/Open

4.11

4.8

3.3.7

3.3.6

Replace

Suction and discharge pressures

tend to equalize when system is

operating

Compressor valve defective See Table 1-2.

3.3.4 Abnormal Noise Or Vibrations

Compressor Loose mounting hardware

Worn bearings

Worn or broken valves

Liquid slugging

Insufficient oil

Clutch loose, rubbing or is defective

V-belt cracked, worn or loose

Dirt or debris on fan blades

Check/Tighten

See Table 1-2.

SeeTable 1-2.

3.3.7

4.20.3

Check

Check/Adjust

Clean

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Carrier 60 Service Manual Page 32

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