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33 

Inverter control, which equipped with a microcomputer in determining the most suitable operating mode as time 
passes, automatically adjusts output power for maximum comfort always. In order to achieve the suitable operating 
mode, the microcomputer maintains the set temperature by measuring the temperature of the environment and 
performing temperature shifting. The compressor at outdoor unit is operating following the frequency instructed by 
the microcomputer at indoor unit that judging the condition according to internal setting temperature and intake air 
temperature. 

Once the operation starts, remote control setting temperature will be taken as base value for temperature shifting 
processes. These shifting processes are depending on the air conditioner settings and the operation environment. 
The final shifted value will be used as internal setting temperature and it is updated continuously whenever the 
electrical power is supplied to the unit. 
 

 

š  Compressor is OFF when Intake Air Temperature - Internal Setting Temperature < -1.5°C continue for 3 minutes. 

š  When compressor is OFF (Thermostat OFF) and AUTO FAN is set, the fan will stop periodically. 

š  Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature > 

Compressor OFF point. 

 

š  Compressor is OFF when Intake Air Temperature - Internal Setting Temperature < -2.0°C continue for 3 minutes. 

š  When compressor is OFF (Thermostat OFF) and AUTO FAN is set, the fan will stop periodically. 

š  Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature > 

Compressor OFF point. 

 

š  Compressor is OFF when Intake Air Temperature - Internal Setting Temperature > +2.0°C continue for 3 minutes. 

š  Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature < 

Compressor OFF point. 

 
 
 
 
 

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š  This mode can be set using remote control and the operation is decided by remote control setting temperature, 

remote control operation mode and indoor intake air temperature. 

š  During operation mode judgment, indoor fan motor (with speed of Lo-) is running for 30 seconds to detect the 

indoor intake air temperature. 

š  Every 10 minutes, the indoor temperature is judged. 

š  For the 1st judgment 

o

  If indoor intake temperature - remote control setting temperature ≥ 2°C, COOL mode is decided. 

o

 If 

-2°C 

≤ indoor intake temperature - remote control setting temperature < 2°C, DRY mode is decided. 

o

  If indoor intake temperature - remote control setting temperature < -2°C, HEAT mode is decided. 

 

 

 

š  For the 2nd judgment onwards 

o

  If indoor intake temperature - remote control setting temperature ≥ 3°C, if previous operate in DRY mode, 

then continue in DRY mode. otherwise COOL mode is decided. 

o

 If 

-2°C 

≤ indoor intake temperature - remote control setting temperature < 3°C, maintain with previous mode. 

o

  If indoor intake temperature - remote control setting temperature < -2°C, HEAT mode is decided. 

 

 

 

A. Basic Rotation Speed (rpm) 
i. Manual Fan Speed 
[Cooling, Dry] 

š  Fan motor’s number of rotation is determined according to remote control setting. 

 

Remote control 

○ 

○ 

○ 

○ 

○ 

Tab Hi 

Me+ 

Me 

Me- 

Lo 

 
[Heating] 

š  Fan motor’s number of rotation is determined according to remote control setting. 

 

Remote control 

○ 

○ 

○ 

○ 

○ 

Tab SHi 

Me+ 

Me 

Me- 

Lo 

 
ii. Auto Fan Speed 
[Cooling, Dry] 

š  According to room temperature and setting temperature, indoor fan speed is determined automatically. 

š  When set temperature is not achieved, the indoor fan will operate according to pattern below. 

 

 

 

š  When set temperature achieved, the indoor fan speed will be fixed. When thermostat off, the fan stop periodically. 

35 

[Heating] 

š  According to indoor pipe temperature, automatic heating fan speed is determined as follows. 

 

 

 

š  Immediately after the fan motor started, feedback control is performed once every second. 

š  During fan motor on, if fan motor feedback ≥ 2550 rpm or < 50 rpm continue for 10 seconds, then fan motor error 

counter increase, fan motor is then stop and restart. If the fan motor counter becomes 7 times, then H19 - fan 
motor error is detected. Operation stops and cannot on back. 
 

š  It starts when compressor starts operation and it stops 30 seconds after compressor stops operation. 

 

 

 

š  During cooling operation, and outdoor ambient temperature is below 8°C, outdoor fan speed will be controlled 

according to outdoor piping temperature as following: 

 

 

 

 

OD Pipe Temperature

A 26°C 
B 33°C 

 

š  During above condition, when indoor heat exchanger temperature is below 5°C, the outdoor fan will stop 

according to outdoor piping temperature as following: 

 

 

 

36 

š  There are two types of airflow, vertical airflow (directed by horizontal vane) and horizontal airflow (directed by 

vertical vanes). 

š  Control of airflow direction can be automatic (angles of direction is determined by operation mode, heat 

exchanger temperature and intake air temperature) and manual (angles of direction can be adjusted using 
remote control). 

 

Operation Mode 

Airflow Direction 

Upper Vane Angle (°) 

Lower Vane Angle (°) 

1 2 3 4 5 1 2 3 4 5 

Heating 

Auto with Heat 

Exchanger 

Temperature 

A 25 

17 

B 55 

37 

C 25 

17 

Manual 

20 45 55 65 70 17 27 37 47 56 

Cooling 

Auto 

45 ~ 70 

2 ~ 39 

Manual 

20 25 50 55 70  2  7  17 27 39 

Soft Dry 

Auto 

45 ~ 70 

2 ~ 39 

Manual 

20 25 50 55 70  2  7  17 27 39 

 

1.  Automatic vertical airflow direction can be set using remote control; the vane swings up and down within the 

angles as stated above. For heating mode operation, the angle of the vane depends on the indoor heat 
exchanger temperature as Figure 1 below. It does not swing during fan motor stop. When the air conditioner is 
stopped using remote control, the vane will shift to close position. 

2.  Manual vertical airflow direction can be set using remote control; the angles of the vane are as stated above and 

the positions of the vane are as Figure 2 below. When the air conditioner is stopped using remote control, the 
vane will shift to close position. 

 

 

š  Automatic horizontal airflow direction can be set using remote control; the vane swings left and right within the 

angles as stated below. For heating mode operation, the angle of the vane depends on the indoor heat 
exchanger temperature as Figure 1 below. It does not swing during fan motor stop. 

 

Operation Mode 

Vane Angle (°) 

Heating, with heat exchanger temperature 

A 65 

~115 

B 90 

Cooling and soft dry 

65 ~115 

 

58°C

50°C

Indoor Heat
Exchanger Temperature

36°C

30°C

C

A

Figure 1

B

Figure 2

Upper vane: 60°
Lower vane: 58°

Reference point

Closed Position

Step 1

Step 2

Step 3

Step 4

Step 5