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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 tem-
perature 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 8.5~9.5kg/cm
2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with
putty.
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Only for training and service purposes
Temp. difference : approx. 0°C
Current
Temp. difference : approx. 8°C
Current
Temp. difference : less than 8°C
Current
Temp. difference : over 8°C
Temperature
Defective compressor
High
Defective 4-way reverse valve
Excessive amount of
Normal
refrigerant
Insufficient amount of
Higher
refrigerant (Leakage)
Clogging
2
G(Cooling) at normal condition.
: less than 80% of
rated current
: less than 80% of
rated current
: over the reated
current
Cause of Trouble
- 52 -
• 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.
LGE Internal Use Only
- Quick Links:
- Self Diagnosis Function
- Schematic Diagram
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Table of Contents
Troubleshooting
