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51
In order to diagnose malfunctions, make sure that there are no
electrical problems before inspecting the refrigeration cycle.
Such problems include insufficient insulation, problem with the
power source, malfunction of compressor or 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)
Cooling mode
Gas side pressure
Mpa
(kg/cm G)
2
0.4~0.6(4~6)
12~16
Outlet air
temperature
(
)
Condition: indoor fan speed: high
outdoor temperature:
35
35
(Cooling mode)
7
(Heating mode)
Difference in the
intake and outlet
air temperature
More than 8
(15 minutes afte an
operation is started) at the cooling mode
Normal
Measuring electric current
during operation
during operation
Measuring gas side
pressure
pressure
Less than 14
at the heating mode.
Value of electric
current
during operation
Higher than
specified
Dusty heat exchanger
preventing heat radiation
Excessive amount
of refrigerant
Lower than specified
Gas side pressure
Cooling
mode
mode
High
Low
Low
Inefficient compressor
Insufficient refrigerant
clogged strainer or
capillary tube
capillary tube
12.1. Refrigeration cycle system
12 Troubleshooting Guide
Measuring the air
temperature difference
temperature difference
Heating mode
1.5~2.1(15~21)
36~45
More than 14
(15 minutes afte an
operation is started)
at the heating mode
Less than 8
at the cooling mode.
Inefficient compressor
Insufficient refrigerant
clogged strainer or
capillary tube
capillary tube
Low
Low
Heating
mode
mode
Low
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