Troubleshooting Guide

CycleParts

Trouble analysis

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

Temp. Difference

Operating Current

Temp. difference : approx. °F(0°C)

Current: less than 80% of rated current

Temp. difference : approx. 14°F(8°C)

Current: less than 80% of rated current

Temp. difference

: less than 14°F(8°C)

Current

: over the reated

 

current

All amount of refrigerant leaked out. Check refrigeration cycle.

Refrigerant leakege Clog of refrigeration cycle Defective compressor

Excessive amount of refrigerant

Temp. difference : over 14°F(8°C)

• 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.

Suction pressure

Temperature

 

 

(Compared with

(Compared with

Cause of Trouble

Description

the normal value)

the normal valve)

 

 

 

 

 

 

 

High

Defective compressor

Current is low.

 

Defective 4-way reverse valve

 

 

 

 

Higher

 

 

 

 

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.

 

 

 

 

NOTICE

1.The suction pressure is usually 8.5~9.5 kg/cm2G(Cooling) at normal condition.

2.The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty.

Service Manual 49

Page 49
Image 49
LG Electronics LAN121CNM, LAU121CNM, LA121HPMI service manual Cycle Parts, Trouble analysis

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