Datasheet

54
15. Troubleshooting Guide
15.1 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) 15 ~ 17
Heating Mode 2.3 ~ 2.8 (23 ~ 28) 35 ~ 41
Condition: - Indoor fan speed = High
- Outdoor temperature = 35°C at cooling mode
and 7°C at heating mode.
- Compressor operates 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) for
cooling mode.
Above 14°C
(15 minutes after an
operation is started) for
heating mode.
Less than 8°C at the cooling mode
Less than 14°C at the heating mode
Higher than specified
Heating
Mode
High
Low
Low
Lower than specified
Inefficient compressor
Insufficient refrigerant
Clogged strainer or
capillary cube
Cooling
Mode
Low
Low
Low