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33 

1 .Frequency of the compressor 

For prevention of freezing of the indoor evaporator, the frequency of the    compressor will be changed according 

to the indoor piping temperature. 
 
 
 
 
 
 
 
 
 
2 .Indoor Fan Control 

Indoor fan speed changes according to the indoor piping temperature. 

 
 
 
 
 
 
 
 
 
 

• To prevent dew formation at indoor unit discharge area. 
• This control starts if all conditions continue for 20 minutes: 

- Operated with Cooling or Soft Dry Mode. 
- Indoor intake temperature is between 25℃ and 29℃. 
- Outdoor air temperature is less than 30℃. 

• This control stopped then receive air swing change signal from Remote Control. 

The frequency for the compressor will change according to the outdoor piping temperature. 

 

 
 
 
 
 
 
 
 
 
 
 
 

1. Indoor fan is controlled by the indoor piping temperature. 

●  Manual Fan Speed 

 

Piping Temperature(℃) 

K0 K1 K2 K3 K4 K5 K6 K7 K8 K9

K10

K11

16 19 24 32 32 36 36 39 54 54

57  60 

9℃. 
8℃. 
6℃. 
0℃. 

34 

 

●   Auto Fan Speed 
 
 

 

2. During heating operation, the indoor fan will run at the following speed when the compressor stops.

 

 

3. Hot Start 
When the heating operation starts, the indoor fan stops and the compressor run with the frequency of 117Hz. 
This is to prevent the cold airflow from blowing. 
If the piping temperature rises to 19 ℃, and the indoor fan speed and airflow direction varies with the indoor piping 
temperature, the hot start control is completed.

 

The frequency for the compressor is determined by indoor piping temperature. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

K7 

Fixed 

+15rpm/s 

Free 

K8 

460

Indoor piping temp. 

35 

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. 
 

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 

Heating Mode 2.3 ~2.9 (23~29) 

36~45 

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 

•  Measuring the air 

temperature different 

•  Measuring electric 

•  Measuring gas side 

pressure 

More than 8°C 

(15 minutes after an operation 

is started) at cooling mode. 

Above 14°C (15 minutes after 

an operation is started.) at 

heating mode 

Less than 8°C at the cooling mode 

Less than 14°C at the heating mode

Higher than specified

Lower than 
specified 

Gas side 

pressure 

Inefficient compressor

Insufficient refrigerant

Clogged strainer or 

capillary cube 

Cooling 

Mode 

High

Low

Low

Inefficient compressor

Insufficient refrigerant

Clogged strainer or 

capillary cube 

Heating 

Mode 

Low

Low

Low

36 

 

Cooling Mode 

Heating Mode 

Condition of the  
air conditioner 

Low Pressure 

High 
Pressure 

Electric current 
during 
operation 

Low Pressure 

High 
Pressure 

Electric current 
during operation

Insufficient 
refrigerant 
(gas leakage) 

Ô 

Ô 

Ô 

Ô 

Ô 

Ô 

Clogged capillary 
tube or 
strainer 

Ô 

Ô 

Ô 

Ò 

Ò 

Ò 

Short circuit in the 
indoor unit 

Ô 

Ô 

Ô 

Ò 

Ò 

Ò 

Heat radiation 
deficiency 
of the outdoor unit 

Ò 

Ò 

Ò 

Ô 

Ô 

Ô 

Inefficient 
compression 

Ò 

Ô 

Ô 

Ò 

Ô 

Ô 

• Carry out the measurement of pressure, electric current, and temperature fifteen minutes after an operation is 
started. 
 

When the air-conditioner is stopped due to malfunction detected by itself, the operation can be restarted using AUTO 
Switch on the indoor unit. In forced operation, the frequency for compressor and fan speed can not be changed and 
the signal receiving sound is different. 
Normal Operation ON: “pep” 
Forced Operation ON: “pep”, “pep”, “pep”, “pep” 
Stop: “pep” 
Note: Refer to the Diagnosis Code Table for the malfunction when forced operation is not available.

 

1. Keeping the CHECK button on the remote controller depressed for 5 seconds, error code ranging from H11 to H99 

can be displayed on the remote controller. 

2. The error code is changed and diagnosis signal is transmitted to the indoor unit by pressing the Temp Up button 

on the remote control. 

3. When the malfunction of the air-conditioner matches the error code on the remote control, four beeps can be heard 

from the indoor unit and the operation indicator will light up. 

4. Keep the CHECK button depressed continuously for 5 seconds to cancel the diagnosis function.