Cycle Parts - LG LAN091CNP, LAU091CNP, LAN121CNP Service Manual

Troubleshooting Guide

Cycle Parts

Trouble analysis
1. Check temperature difference between intake and discharge air and operating current.
Temp. Difference
Operating Current
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
(Compared with (Compared with
the normal value) the normal valve)
Higher
Lower
NOTICE
1. The suction pressure is usually 4.5~6.0 kg/cm
2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with
putty.
62 Room Air Conditioner
Temp. difference : approx. 0˚F(0°C)
Current
Temp. difference : approx. 14°F(8°C)
Current
Temp. difference : less than 14°F(8°C)
Current
Temp. difference : over 14°F(8°C)
Temperature
Defective compressor
High
Defective 4-way reverse valve
Excessive amount of
Normal refrigerant
Insufficient amount of
Higher refrigerant (Leakage)
Clogging
: less than 80% of
rated current
: less than 80% of
rated current
: over the reated
current
Cause of Trouble
2 G(Cooling) at normal condition.
• All amount of refrigerant leaked
out. Check refrigeration cycle.
• Refrigerant leakege
Clog of refrigeration cycle
Defective compressor
• Excessive amount of refrigerant
• Normal
Description
Current is low.
High pressure does not quickly
rise at the beginning of
operation.
Current is low.
Current is low.