LG Electronics LSN090HE, LSN090CE, LSU120CE, LSU090HE, LSU090CE, TRUE Cycle Parts, Trouble analysis

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

Temp. difference : over 14°F(8°C)

•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.

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 51