LB-D2460HL - LG Air Conditioner Service Manual (repair manual). Page 30

1. Check temperature difference between intake and discharge air and operating current. 

Temp. Difference 

Temp. difference   :   approx. 0°C
Current                  :   less than 80% of 

rated current  

Temp. difference   :   approx. 8°C
Current                  :   less than 80% of 

rated current  

Temp. difference   :   less than 8°C
Current                  :   over the rated

current 

Temp. difference   :   over 8°C 

Operating Current 

All amount of refrigerant leaked out
Check refrigeration cycle

Refrigerant leakege
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 relativery 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. 

Suction pressure

Temperature

(Compared with

(Compared with

Cause of Trouble

Description

the normal value)

the normal value)

Defective compressor

Current is low

Defective 4-way reverse valve

Excessive amount of

High pressure does not quickly

Normal

refrigerant

rise at the beginning of 
operation

Insufficient amount of 

Current is low

Lower 

Higher

refrigerant (Leakage)
Clogging

Current is low 

High 

Higher  

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