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13. Troubleshooting Guide
13.1 Refrigeration Cycle System
In order to diagnose malfunctions, ensure the air conditioner is free
from electrical problems before inspecting the refrigeration cycle.
Such problems include insufficient insulation, problem with the
power source, malfunction of a compressor and a fan. The normal
outlet air temperature and pressure of the refrigeration cycle
depends on various conditions, the standard values for them are
shown in the table to the right.
Normal Pressure and Outlet Air Temperature (Standard)
Gas Pressure
MPa
(kg/cm
2
G)
Outlet air
Temperature
(°C)
Cooling Mode
0.9 ~ 1.2 (9 ~ 12)
12 ~ 16
Condition: Indoor fan speed = High
Outdoor temperature = 35°C at cooling mode.
Compressor operate at rated frequency
Different in the intake
and outlet
air temperatures
Normal
Value of electric current
during operation
Dusty condenser
preventing heat radiation
Excessive amount
of refrigerant
Gas side
pressure
Inefficient compressor
Insufficient refrigerant
Clogged strainer or
capillary cube
Measuring the air
temperature different
Measuring electric current
during operation
Measuring gas side
pressure
More than 8
°
C
(15 minutes after an
operation is started) at
cooling mode.
Less than 8
°
C at the cooling mode
Higher than specified
Cooling
Mode
High
Low
Low
Lower than specified
