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15.2 Protection Control For Cooling & Soft Dry Operation
15.2.1 Outdoor Air Temperature Control
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.
diagram below.
This control will begin 1 minute after the compressor starts.
Compressor frequency will adjust base on Outdoor Air Temperature.
15.2.2 Cooling Overload Control
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)
15.2.3 Dew Prevention Control 1
1 To prevent dew formation at indoor unit discharge area.
2 This control activated if:
2 This control activated if:
o
Outdoor air temperature and Indoor pipe temperature judgment by microcontroller if fulfilled.
o
When Cooling or Dry mode is operated more than 20 minutes or more.
3 This control stopped if:
o
Compressor
stopped.
o
Remote control setting changed. (fan speed / temperature)
o
Outdoor air temperature and indoor intake temperature changed.
4 Fan speed will be adjusted accordingly in this control.
15.2.4 Freeze Prevention Control 1
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
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.
15.2.5 Freeze Prevention Control 2
1 Control start conditions
o
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
- Compressor stops for freeze prevention control
o
Either one of the conditions above occurs 5 times in 60 minutes.
2 Control
contents
o
Operation
stops.
o
Timer LED blinks and “H99” indicated.
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15.2.6 Odor
Cut
Control
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.
- 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.
15.3 Protection Control For Heating Operation
15.3.1 Intake Air Temperature Control
Compressor will operate at limited frequency if indoor intake air temperature is 30°C or above.
15.3.2 Outdoor Air Temperature Control
The maximum current value is regulated when the outdoor air temperature rises above 14°C in order to avoid
compressor overloading.
compressor overloading.
15.3.3 Overload Protection Control
The compressor operating frequency is regulated in accordance to indoor heat exchanger temperature as shown in
below figures.
below figures.
15.3.4 Cold Draught Prevention Control
When indoor pipe temperature is low, cold draught operation starts where indoor fan speed will be reduced.
15.3.5 Deice
Operation
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.
outdoor fan motor stop and operation LED blinks.
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16. Servicing
Mode
16.1 Auto OFF/ON Button
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.
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 heard 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 heard 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.
5 seconds. A “beep” sound will heard 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 heard 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.
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
with
diode
C
Open Short
with
diode
D
* Diode is field supplied. Part number: SOD-323 IN4148WS / LMDL914T1G
During Remote Control Number Switch Mode, press any button at remote control to transmit and store
the transmission code to the EEPROM.
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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.
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.
o
Short “beep”: Turn OFF remote control receiving sound.
o
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.
16.2 Remote Control Button
16.2.1 SET
BUTTON
To check remote control transmission code and store the transmission code to EEPROM
o
Press “SET” button continuously for 10 seconds by using pointer.
o
Press “TIMER SET” button until a “beep” sound is heard as confirmation of transmission code changed.
16.2.2 RESET
(RC)
To clear and restore the remote control setting to factory default.
o
Press once to clear the memory
16.2.3 RESET
(AC)
To restore the unit’s setting to factory default
o
Press once to restore the unit’s setting.
16.2.4 TIMER
▲
To change indoor unit indicator’s LED intensity
o
Press continuously for 5 seconds.
16.2.5 TIMER
▼
To change remote control display from Degree Celsius (°C) to Degree Fahrenheit (°F)
o
Press continuously for 10 seconds.
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