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32
12. Troubleshooting Guide
12.1 Refrigeration Cycle System
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 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 on the right.
Value of electric
current during operation
Difference in the intake
and outlet
air temperatures
Lower than specified
Higher than specified
Cooling Mode
Heating Mode
High
Low
Low
Low
Low
Low
Gas side
pressure
Dusty condenser
preventing heat radiation
● Measuring electric current
during operation
● Measuring gas side pressure
Excessive amount
of refrigerant
Inefficient compressor
Insufficient refrigerant
Insufficient refrigerant
Inefficient compressor
Clogged strainer or
expansion valve
Clogged strainer or
capillary tube
Less than 14.4°F at the cooling mode.
Less than 25.2°F at the cooling mode.
More than 14.4°F
(15 minutes after an
operation is started.)
at cooling mode.
Above 25.2°F
(15 minutes after an
operation is started.)
at heating mode
Normal
● Measuring the air temperature
difference
Normal Pressure and Outlet Air Temperature (Standard)
Gas Pressure
PSI
(kg/cm
2
G)
Outlet air
Temperature
(°F)
Cooling Mode
130.53 ~ 174.04
(9 ~ 12)
53.6 ~ 60.8
Heating Mode
333.58 ~ 420.60
(23 ~ 29)
96.8 ~ 113
Condition: Indoor fan speed = High
Outdoor temperature 95°F at cooling mode
and 44.6°F at heating mode.
Compressor operate at rated frequency
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