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The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the diagram below.
This control will begin 1 minute after the compressor starts.
Compressor frequency will adjust base on Outdoor Air Temperature.

i. Pipe temperature limitation/restriction

• Detects the Outdoor pipe temperature and carry out below restriction/limitation (Limit the compressor Operation frequency)
• The compressor stop if outdoor pipe temperature exceeds 65

“C.

• If the compressor stops 4 times in 20 minutes, Timer LED blinking (F95: outdoor high pressure rise protection)

1. To prevent dew formation at indoor unit discharge area.
2. This control activated if:

• Outdoor air temperature and Indoor pipe temperature judgment by microcontroller if fulfilled.
• When Cooling or Dry mode is operated more than 20 minutes or more.

3. This control stopped if:

• Compressor stopped.
• Remote control setting changed. (fan speed / temperature)
• Outdoor air temperature and indoor intake temperature changed.

4. Fan speed will be adjusted accordingly in this control.

1. When indoor heat exchanger temperature is lower than 0

“C continuously for six minutes, compressor will stop operating.

2. Compressor will resume its operation three minutes after the indoor heat exchanger is higher than 5

“C.

3. At the same time, indoor fan speed will be higher than during its normal operation.
4. If indoor heat exchanger temperature is higher than 5

“C for five minutes, the fan speed will return to its normal operation.

1. Control start conditions

• During Cooling operation and soft dry operation.

- During thermo OFF condition, indoor intake temperature is less than 10°C or
- Compressor stops for freeze prevention control

• Either one of the conditions above occurs 5 times in 60 minutes.

2. Control contents

• Operation stops.
• Timer LED blinks and “H99” indicated.

• To reduce the odor released from the unit.

- Start Condition

- AUTO FAN Speed is selected during COOL or DRY operation.
- During freeze prevention control and timer preliminary operation, this control is not applicable.

- Control content

- Depends on compressor conditions:

1. Compressor OFF 

‘ Compressor ON.

The indoor unit fan stops temporarily and then starts to blow at minimum airflow for 30 seconds.

2. Compressor ON 

‘ Compressor OFF.

The indoor unit fan stops for 90 seconds and then blows at minimum airflow for 20 seconds.

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Compressor will operate at limited frequency if indoor intake air temperature is 30

“C or above.

The maximum current value is regulated when the outdoor air temperature rises above 14

“C in order to avoid compressor

overloading.

The compressor operating frequency is regulated in accordance to indoor heat exchanger temperature as shown in below figures.

When indoor pipe temperature is low, cold draught operation starts where indoor fan speed will be reduced.

When outdoor pipe temperature and outdoor air temperature is low, deice operation start where indoor fan motor and outdoor fan
motor stop and operation LED blinks.

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1. AUTO OPERATION MODE

The Auto operation will be activated immediately once the Auto OFF/ON button is pressed. This operation can be used to
operate air conditioner with limited function if remote control is misplaced or malfunction.

2. TEST RUN OPERATION (FOR PUMP DOWN/SERVICING PURPOSE)

The Test Run operation will be activated if the Auto OFF/ON button is pressed continuously for more than 5 seconds. A “beep”
sound will occur at the fifth seconds, in order to identify the starting of Test Run operation (Forced cooling operation). Within 5
minutes after Forced cooling operation start, the Auto OFF/ON button is pressed for more than 5 seconds. A 2 “beep” sounds
will occur at the fifth seconds, in order to identify the starting of Forced heating operation.

The Auto OFF/ON button may be used together with remote control to set / change the advance setting of air conditioner
operation.

3. REMOTE CONTROL NUMBER SWITCH MODE

The Remote Control Number Switch Mode will be activated if the Auto OFF/ON button is pressed continuously for more than
11 seconds (3 “beep” sounds will occur at 11th seconds to identify the Remote Control Number Switch Mode is in standby
condition) and press “AC RESET” button and then press any button at remote control to transmit and store the desired
transmission code to the EEPROM.

There are 4 types of remote control transmission code could be selected and stored in EEPROM of indoor unit. The indoor
unit will only operate when received signal with same transmission code from remote control. This could prevent signal
interference when there are 2 or more indoor units installed nearby together.
To change remote control transmission code, short or open jumpers at the remote control printed circuit board

Remote Control Printed Circuit Board

Jumper A (J1)

Jumper B (D2)

Remote Control No.

Short

Open

A (Default)

Open

Open

B

Short

Short

C

Open

Short

D

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4. REMOTE CONTROL RECEIVING SOUND OFF/ON MODE

The Remote Control Receiving Sound OFF/ON Mode will be activated if the Auto OFF/ON button is pressed continuously for
more than 16 seconds (4 “beep” sounds will occur at 16th seconds to identify the Remote Control Receiving Sound Off/On
Mode is in standby condition) and press “AC Reset” button at remote control.

Press “Auto OFF/ON button” to toggle remote control receiving sound.
- Short “beep”: Turn OFF remote control receiving sound.
- Long “beep”: Turn ON remote control receiving sound.

After Auto OFF/ON Button is pressed, the 20 seconds counter for Remote Control Receiving Sound OFF/ON Mode is
restarted.

• To check remote control transmission code and store the transmission code to EEPROM.

- Press “SET” button continuously for 10 seconds by using pointer.
- Press “TMER SET” button until a “beep” sound is heard as confirmation of transmission code change.

• To change the air quality sensor sensitivity

- Press and release by using pointer.
- Press the Timer Decrement button to select sensitivity:

1. Low Sensitivity
2. Standard (Default)
3. Hi Sensitivity

- Confirm setting by pressing Timer Set button, a “Beep” sound will be heard. LCD returns to original display after 2 seconds.
- LCD returns to original display if remote control does not operate for 30 seconds.

• To clear and restore the remote control setting to factory default

- Press once to clear the memory.

• To restore the unit’s setting to factory default

- Press once to restore the unit’s setting.

• To change indoor unit indicator’s LED intensity

- Press continuously for 5 seconds.

• To change remote control display from Degree Celsius to Degree Fahrenheit.

- Press continuously for 10 seconds.