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Instructed frequency for compressor operation will be regulated by compressor top temperature. The changes of frequency are as
below figure.

The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the diagram below.

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 63

°C

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

ii. Electrical part temperature rise protection control

• To prevent electrical component temperature rise during cooling overload.
• Judgement condition is by outdoor temperature (sampled every 10s).

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• Control contents: 

Outdoor fan speed (switch to zone A and B minimum fan speed).
Outdoor total current (zone C) higher than the specified.

• Cancellation condition: When one of above is not satisfied.

1. When indoor heat exchanger temperature is lower than 2

°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 10

°C.

3. At the same time, indoor fan speed increase +40 rpm compared to its normal operation.
4. If indoor heat exchanger temperature is higher than 10

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

Compressor will operate at rated freq. or less respectively if either one of the below conditions occur:

1. When the indoor intake air temperature is above 10

°C and remote control setting fan speed is lower Me-.

2. When the indoor intake air temperature is 30

°C or above.

The compressor operating frequency is regulated in accordance to the outdoor air temperature as shown in the below figures. This
control will begin one minute after the compressor starts.

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

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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 any button at remote control to transmit and store the desired transmission code to the EEPROM.

For transmission code selection explanation, please refer to “Select Remote Control Transmission Code”.

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 and then press “Check” 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.

• 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.