LG Electronics LSC183VMA service manual Cycle Troubleshooting Guide, Trouble analysis

Cycle Troubleshooting Guide

1. Trouble analysis

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

Temp. Difference

Operating Current

Temp. difference	:approx. 0°F	All amount of refrigerant leaked out.
Current	:less than 80% of
		Check refrigeration cycle.
	rated current
		Refrigerant leakage
Temp. difference	:approx. 8°C(14°F)
Current	:less than 80% of	Clog of refrigeration cycle
	rated current	Defective compressor
Temp. difference	:less than 8°C(14°F)
Current	:less than 80% of	Excessive amount of refrigerant
	rated current
Temp. difference	:over 8°C(14°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 the	(Compared with the	Cause of Trouble	Description
normal value)	normal value)
	High	Defective compressor	Current is low.
		Defective 4-way reversing valve
Higher
	Normal	Excessive amount of refrigerant	High pressure does not quickly
			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 4.5~5.0 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.

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