66 Multi type Air Conditioner
Troubleshooting Guide
Trouble analysis
1. Check temperature difference between intake and discharge air, and operating current.
All amount of refrigerant leaked out.
Check refrigeration cycle.
Refrigerant leakage
Clog of refrigeration cycle
Defective compressor
Excessive amount of refrigerant
Normal
Notice:
Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relatively higher, temperature difference is smaller. When the room air humidity is relatively lower
temperature difference is larger.
2. Check temperature and pressure of refrigeration cycle.
Notice:
1. The suction pressure is usually 4.5~6.0 kg/cm
2
G at normal condition.
2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with
putty.
Temp. difference
: approx. 0°C(32°F)
Current
: less than 80% of
rated current
Temp. difference
: approx. 8°C(46.4°F)
Current
: less than 80% of
rated current
Temp. difference
: less than 8°C(46.4°F)
Current
: near the rated cur-
rent
Temp. difference
: over 8°C(46.4°F)
Temp. Difference
Operating Current
Suction pressure
Temperature
(Compared with
(Compared with
Cause of Trouble
Description
the normal value)
the normal value)
High
Defective compressor
Current is low.
Normal
Excessive amount of
High pressure does not quickly
refrigerant
rise at the beginning of operation.
Insufficient amount of
Current is low.
Lower
Higher
refrigerant(Leakage)
Clogging
Higher
Cycle Troubleshooting Guide
Summary of Contents for A2UC243FA0 (LMU240CE)
Page 56: ...56 Multi type Air Conditioner Schematic Diagram 2 Outdoor Unit ...
Page 57: ...Service Manual 57 Schematic Diagram ...
Page 60: ...60 Multi type Air Conditioner Schematic Diagram 2 Art Cool Type TOP VIEW BOTTOM VIEW ...
Page 62: ...62 Multi type Air Conditioner Schematic Diagram 3 Outdoor Unit 1 Component side ...
Page 63: ...Service Manual 63 Schematic Diagram 2 Solder side ...
