Troubleshooting Guide

CycleTroubleshooting Guide

Trouble analysis

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

Temp. Difference

Operating Current

 

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

 

 

 

All amount of refrigerant leaked out. Check refrigeration cycle.

Refrigerant leakage

Clog of refrigeration cycle

Defective compressor

Excessive amount of refrigerant

Temp. difference : over 8°C(46.4°F)

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.

Suction pressure

Temperature

 

 

(Compared with

(Compared with

Cause of Trouble

Description

the normal value)

the normal value)

 

 

 

 

 

 

 

High

Defective compressor

Current is low.

Higher

 

 

 

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

 

 

 

 

 

Notice:

1.The suction pressure is usually 4.5~6.0 kg/cm2G at normal condition.

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

66Multi type Air Conditioner

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LG Electronics AMNC093APM0(LMAN090CNS), AMNH123APM0(LMAN120HNS) service manual Cycle Troubleshooting Guide, Trouble analysis

AMNC093APM0(LMAN090CNS), AMNH123DEA0 (LMN120HE), A2UC243FA0 (LMU240CE), AMNH123APM0(LMAN120HNS), A2UH243FA0(LMU240HE) specifications

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