Troubleshooting; Unit Will Not Cool; System Runs But Has Insufficient Cooling - United Technologies Carrier TRANSICOLD 68RM35-604-20 Operation And Service

INDICATION/
TROUBLE
3.1

UNIT WILL NOT COOL

Compressor will not run
Electrical malfunction
3.2

SYSTEM RUNS BUT HAS INSUFFICIENT COOLING

Compressor
Refrigeration system
3.3 ABNORMAL PRESSURES
High discharge pressure
Low discharge pressure
High suction pressure
Low suction pressure
Low evaporator air flow
Suction and discharge pressures
tend to equalize when system is
operating
NOTE: Refer to Model 05G Compressor Manual, Form No. 62-02756.
SECTION 3

TROUBLESHOOTING

Table 3-1. Troubleshooting Procedures
POSSIBLE CAUSES
V-Belt loose or defective
Clutch coil defective
Clutch malfunction
Compressor malfunction
Safety device open
Bus power source defective
ACMS switch defective
Low Ambient Thermostat open
Circuit Breaker CB6/safety device open
Electronic Thermostat malfunction
Water Temperature Switch (WTS) open
V-Belt loose or defective
Compressor valves defective
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 line solenoid valve stuck closed
Refrigerant overcharge
Noncondensable in system
Condenser fan rotation incorrect
Condenser coil dirty
Compressor valve(s) worn or broken
Low refrigerant charge
Compressor valve(s) worn or broken
Suction service valve partially closed
Filter-drier inlet valve partially closed
Filter-drier partially plugged
Low refrigerant charge
Expansion valve malfunction
Restricted air flow
Blower running in reverse
Dirty air filter
Icing/dirty coil
Compressor valves defective
3-1
REFERENCE
SECTION
Check
Check/Replace
Check/Replace
See Note.
1.4
Check/Repair
Check/Replace
1.5
Check/Reset
3.5
1.5
Check
See Note.
3.3
3.6
3.7
3.7 and 4.12
4.9
Open
1.4
Check
4.9
Check Pressure
Check
Clean
See Note.
4.9
See Note.
Open
Check/ Open
4.10
4.9
3.7
3.6
Check
4.17
Defrost/Clean
See Note.
T-288