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37 

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

remote control operation mode, indoor intake air temperature and outdoor air temperature. 

  During operation mode judgment, indoor fan motor (with speed of Lo-) and outdoor fan motor are running for  

30 seconds to detect the indoor intake and outdoor air temperature. The operation mode is decided based on 
below chart. 

 

 

 
Every 30 minutes, the indoor and outdoor temperature is judged. Based on remote control setting temperature, the 
value of T1 will increase up to 10°C, T2 will decrease by 3°C and T3 will decrease up to 8°C. 
The Auto Operation Mode shifting will take place whenever operation mode changed from Cooling/Soft Dry to 
Heating or vice versa. 

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

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

 

Remote 

control O O O O O 

Tab Hi 

Me+ 

Me 

Me- 

Lo 

 
[Heating] 

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

 

Remote 

control O O O O O 

Tab Hi 

Me+ 

Me 

Me- 

Lo 

 
ii. Auto Fan Speed 
[Cooling, Dry] 
  According to room temperature and setting temperature, indoor fan speed is determined automatically. 

  The indoor fan will operate according to pattern below. 
 

 

 

38 

[Heating] 

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

 

 
B. Feedback control 

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

  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. 

Outdoor fan motor is operated with one fan speed only. It starts when compressor starts operation and it stops 30 
seconds after compressor stops operation. 
 

 

 

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

vertical vanes). 

2  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). 

 

Vane Angle (°) 

Operation Mode 

Airflow Direction 

1 2 3 4 5 

A 5 
B 30 

Auto with Heat Exchanger
 
Temperature 

C 17.5 

Heating 

Manual 5 

17.5 

30 

42.5 

55 

Auto 

5 ~ 35 

Cooling 

Manual 5 

12.5 

20 

27.5 

35 

Auto 

5 ~ 35 

Soft Dry 

Manual 5 

12.5 

20 

27.5 

35 

 

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. 

 

 

 

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

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

 

Operation Mode 

Vane angle (°) 

A 

70 ~ 110 

Heating, with heat exchanger temperature 

B 90 

Cooling and soft dry 

70 ~ 110 

 

 

 

2  Manual horizontal airflow direction can be set using remote control; the angles of the vane are as stated 

below and the positions of the vane are as Figure 2 above. 

 

Pattern 

1 2 3 4 5 

Airflow Direction 
Patterns at Remote 
Control 

 

 

 

 

 

Vane Angle (°) 

90 

70 

80 

100 

110 

 

40 

To provide quiet cooling operation compare to normal operation. 

 
B. Control condition 

a. Quiet operation start condition 

o  When “POWERFUL/QUIET” button at remote control is pressed twice. 

POWERFUL/QUIET LED illuminates (low intensity). 

b. Quiet operation stop condition 

1  When one of the following conditions is satisfied, quiet operation stops: 

a. POWERFUL/QUIET button is pressed again. 
b. Stop by OFF/ON switch. 
c. Timer “off” activates. 
d. AUTO COMFORT button is pressed. 
e. ECONAVI button is pressed. 
f.  Mild Dry Cooling button is pressed. 

2  When quiet operation is stopped, operation is shifted to normal operation with previous setting. 
3  When fan speed is changed, quiet operation is shifted to quiet operation of the new fan speed. 
4  When operation mode is changed, quiet operation is shifted to quiet operation of the new mode. 
5  During quiet operation, if timer “on” activates, quiet operation maintains. 
6  After off, when on back, quiet operation is not memorised. 

 
C. Control contents 

1  Fan speed is changed from normal setting to quiet setting of respective fan speed. 

This is to reduce sound of Hi, Me, Lo for 3dB (some models more than 3dB). 

2  Fan speed for quiet operation is reduced from setting fan speed. 

 

To provide quiet heating operation compare to normal operation. 

 
B. Control condition 

a. Quiet operation start condition 

o  When “POWERFUL/QUIET” button at remote control is pressed. 

POWERFUL/QUIET LED illuminates. 

b. Quiet operation stop condition 

1  When one of the following conditions is satisfied, quiet operation stops: 

a. POWERFUL/QUIET button is pressed again. 
b. Stop by OFF/ON switch. 
c. Timer “off” activates. 
d. AUTO COMFORT button is pressed. 
e. ECONAVI button is pressed. 
f.  Mild Dry Cooling button is pressed. 

2  When quiet operation is stopped, operation is shifted to normal operation with previous setting. 
3  When fan speed is changed, quiet operation is shifted to quiet operation of the new fan speed. 
4  When operation mode is changed, quiet operation is shifted to quiet operation of the new mode, expect fan 

only mode. 

5  During quiet operation, if timer “on” activates, quiet operation maintains. 
6  After off, when on back, quiet operation is not memorised. 

 
C. Control contents 

a. Fan Speed manual 

1  Fan speed is changed from normal setting to quiet setting of respective fan speed. 

This is to reduce sound of Hi, Me, Lo for 3dB. 

2  Fan speed for quiet operation is reduced from setting fan speed. 

b. Fan Speed Auto 

1  Indoor FM RPM depends on pipe temp sensor of indoor heat exchanger.