Troubleshooting; Unit Will Not Cool; Unit Runs But Has Insufficient Cooling; Abnormal Pressure - Carrier Transicold 68RF50 Neoplan-LA Operation And Service Manual

INDICATION/
TROUBLE

3.1 UNIT WILL NOT COOL

Compressor will not run
Electrical malfunction

3.2 UNIT RUNS BUT HAS INSUFFICIENT COOLING

Compressor

Refrigeration system

3.3 ABNORMAL PRESSURE

High discharge pressure
Low discharge pressure
High suction pressure
NOTE: Refer to 05G Compressor manual, Form T-199.
SECTION 3

TROUBLESHOOTING

POSSIBLE CAUSES
V-Belt broke or defective
Compressor malfunction
Clutch malfunction
Safety device open
A/C switch defective
A/C relay defective
Low Ambient Thermostat open
Circuit breaker CB6 open
Temperature Controller malfunction
Run Control Switch in OFF position
Liquid Line Solenoid malfunction
Compressor valves defective
V-belt loose
Abnormal pressures
No or restricted evaporator air flow
Expansion valve malfunction
Restricted refrigerant flow
Low refrigerant charge
Service valves partially closed
Safety device open
Refrigerant overcharge
Noncondensibles in system
Condenser fan motor rotation incorrect
Condenser coil dirty
Compressor valves(s) worn or broken
Low refrigerant charge
Compressor valves worn or broken
3-1
REFERENCE
SECTION
Check
See Note
Check/Replace
1.4
Check
Check/2.3
1.5.c
Check/Reset
3.5
Check
4.16
See Note
Check
3.4
2.3
3.7
3.7
4.9
Open
1.4
4.9
Check Pressure
Check/Reverse
Motor Electrical
Leads
Clean
See Note
4.9
See Note