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3-4
T-283
Table 3-3. General System Troubleshooting Procedures
INDICATION/
TROUBLE
POSSIBLE CAUSES
REFERENCE
SECTION
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
Check/Replace
See Note
Electrical malfunction
Coach power source defective
Circuit Breaker/safety device open
Check/Repair
Check/Reset
SYSTEM RUNS BUT HAS INSUFFICIENT COOLING
Compressor
V-Belt loose or defective
Compressor valves defective
Check
See Note.
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
see below
3.5.6
p. 3-5 and 4.11
p. 3-5 and 4.11
4.5 and 4.7
Open
1.6
Check
Restricted air flow
No evaporator air flow or restriction
p. 3-5
Heating system
Heat valve stuck open
p. 3-5
ABNORMAL PRESSURES
High discharge pressure
Discharge transducer failure
Refrigerant overcharge
Noncondensable in system
Condenser motor failure
Condenser coil dirty
Replace
4.4
Check
Check
Clean
Low discharge pressure
Discharge transducer failure
Compressor valve(s) worn or broken
Low refrigerant charge
See Note.
4.5 & 4.7
High suction pressure
Compressor valve(s) worn or broken
See Note.
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
4.10
4.5 and 4.7
p. 3-5
p. 3-5
Replace
Suction and discharge pressures
tend to equalize when system is
operating
Compressor valve defective
See Note.
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 Note.
See Note.
p. 3-5
4.12.2
Check
Check/Adjust
Clean
Summary of Contents for CAPRI-280
Page 1: ...Model CAPRI 280 Septa T 283 Bus Air Conditioning Equipment...
Page 39: ...5 2 Figure 5 1 Electrical Wiring Schematic Diagram Drawing No 62 10112 00 Sheet 1 of 3...
Page 40: ...5 3 Figure 5 1 Electrical Wiring Schematic Diagram Drawing No 62 10112 00 Sheet 2 of 3...
Page 41: ...5 4 Figure 5 1 Electrical Wiring Schematic Diagram Drawing No 62 10112 00 Sheet 3 of 3...