MCC 68AC353-102 MICROMAX, Операция и обслуживание, Страница: 44 / 82

3--5
©
2012 Mobile Climate Control T-348 Rev. 07/2012
Table 3-3. General System Troubleshooting Procedures
INDICATION/
TROUBLE
POSSIBLE CAUSES
REFERENCE
SECTION
3.3.2 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 Table 1-3
Electrical malfunction Coach power source defective
Circuit Breaker/safety device open
Check/Repair
Check/Reset
3.3.3 System Runs But Has Insufficient Cooling
Compressor V-Belt loose or defective
Compressor valves defective
Check
See Table 1-3
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
3.3.4
3.3.7
3.3.8
4.11
4.8
Open
1.8
Check
Restricted air flow No evaporator air flow or restriction 3.3.7
Heating system Reheat coolant valve stuck open 3.3.9
3.3.4 Abnormal Pressures
High discharge pressure Discharge transducer failure
Refrigerant overcharge
Noncondensable in system
Condenser motor failure
Condenser coil dirty
Replace
4.8.1
Check
Check
Clean
Low discharge pressure Discharge transducer failure
Compressor valve(s) worn or broken
Low refrigerant charge
4.18
See Table 1-3
4.8
High suction pressure Compressor valve(s) worn or broken See Table 1-3
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
3.3.8
3.3.7
Replace
Suction and discharge pressures tend
to equalize when system is operating
Compressor valve defective See Table 1-3
3.3.5 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 1-3
SeeTable 1-3
3.3.8
4.15.4
Check
Check/Adjust
Clean