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14. Servicing
Mode
14.1 Auto OFF/ON Button
Auto OFF/ON
Button Pressed
Button Pressed
Auto OFF/ON
Button Pressed
Auto OFF/ON
Button Pressed
5 sec
5 sec
Auto Operation
Test Run Operation
(Forced Cooling Operation)
Stop
Various Setting Mode
Stop
“Beep”
2 x “Beep”
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 be heard at the fifth seconds, in order to identify the starting of this operation.
seconds. A “beep” sound will be heard at the fifth seconds, in order to identify the starting of this operation.
3 VARIOUS SETTING MODE
The Various Setting Mode will be activated if (within 20 seconds of Test Run Operation) the Auto OFF/ON
button is pressed for more than 5 seconds. 2 “beep” sounds will be heard to identify the starting of this
operation.
Under Various Setting Mode, user could perform the following operation:
i. Press Auto OFF/ON button to toggle remote control receiving sound.
- Short “beep”: Turn ON remote control receiving sound.
- Long “beep”: Turn OFF 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.
ii. Remote Control Number Switch.
- 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.
button is pressed for more than 5 seconds. 2 “beep” sounds will be heard to identify the starting of this
operation.
Under Various Setting Mode, user could perform the following operation:
i. Press Auto OFF/ON button to toggle remote control receiving sound.
- Short “beep”: Turn ON remote control receiving sound.
- Long “beep”: Turn OFF 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.
ii. Remote Control Number Switch.
- 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
- During Various Setting Mode, press any button at remote control to transmit and store the desired
transmission code to the EEPROM.
- After signal is received, the Various Setting Mode is cancelled and return to normal operation.
- If there is no code is transmitted of Auto OFF/ON button is not pressed within 20 seconds, the
Various Setting Mode will be cancelled.
transmission code to the EEPROM.
- After signal is received, the Various Setting Mode is cancelled and return to normal operation.
- If there is no code is transmitted of Auto OFF/ON button is not pressed within 20 seconds, the
Various Setting Mode will be cancelled.
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14.2 Remote Control Button
14.2.1 SET
Button
To check current 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 change.
o Press “Timer Set” button until a “beep” sound is heard as confirmation of transmission code change.
To change the air quality sensor:
o Press and release by using pointer
o Press the Timer Decrement button to select sensitivity:
o Press the Timer Decrement button to select sensitivity:
1. Low sensitivity
2. Standard (Default)
3. Hi sensitivity
2. Standard (Default)
3. Hi sensitivity
o Confirm setting by pressing Timer Set button, a “beep” sound will be heard. LCD returns to original display
after 2 seconds.
o LCD returns to original display if remote control does not operate for 30 seconds.
14.2.2 RESET
(RC)
To clear and restore the remote control setting to factory default.
o Press once to clear the memory.
14.2.3 TIMER
▲
To change indoor unit indicators’ intensity:
o Press continuously for 5 seconds.
14.2.4 TIMER
▼
To change remote control display from Degree Celsius (°C) to Degree Fahrenheit (°F)
o Press continuously for 10 seconds.
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15. Troubleshooting
Guide
15.1 Refrigeration cycle system
In order to diagnose malfunctions, make sure that there are no
electrical problems before inspecting the refrigeration cycle.
Such problems include insufficient insulation, problem with the
power source, malfunction of a compressor and a fan.
The normal outlet air temperature and pressure of the
refrigeration cycle depends on various conditions, the standard
values for them are shown in the table on the right.
electrical problems before inspecting the refrigeration cycle.
Such problems include insufficient insulation, problem with the
power source, malfunction of a compressor and a fan.
The normal outlet air temperature and pressure of the
refrigeration cycle depends on various conditions, the standard
values for them are shown in the table on the right.
Normal Pressure and Outlet Air Temperature (Standard)
Gas Pressure
Mpa
(kg/cm
2
G)
Outlet air
Temperature
(°C)
Cooling Mode
0.4 ~ 0.6 (4 ~ 6)
12 ~ 16
Heating Mode 1.5 ~ 2.1 (15 ~ 21)
36 ~ 45
Condition: Indoor fan speed = High
Outdoor temperature 35°C at the cooling
Outdoor temperature 35°C at the cooling
mode and 7°C at the heating mode
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15.1.1 Relationship between the condition of the air conditioner and pressure and
electric current
Cooling Mode
Heating Mode
Condition of the
air conditioner
Low Pressure
High Pressure
Electric current
during operation
Low Pressure
High Pressure
Electric current
during operation
Insufficient refrigerant
(gas leakage)
Clogged capillary tube or
strainer
Short circuit in the indoor unit
Heat radiation deficiency
of the outdoor unit
Inefficient compression
• Carry out the measurement of pressure, electric current, and temperature fifteen minutes after an operation is started.
15.1.2 Diagnosis methods of a malfunction of a compressor and 4-way Valve
Nature of fault
Symptom
Insufficient compressing of a compressor
• Electric current during operation becomes approximately 20% lower than the normal value.
• The discharge tube of the compressor becomes abnormally hot (normally 70°C to 90°C).
• The different between high pressure and low pressure becomes almost zero.
• The discharge tube of the compressor becomes abnormally hot (normally 70°C to 90°C).
• The different between high pressure and low pressure becomes almost zero.
Locked compressor
• Electric current reaches a high level abnormally, and the value exceeds the limit of an
ammeter. In some cases, a breaker turns off.
• The compressor has a humming sound.
ammeter. In some cases, a breaker turns off.
• The compressor has a humming sound.
Insufficient switches of the 4-way valve
• Electric current during operation becomes approximately 80% lower than the normal value.
• The temperature different between from the discharge tube to the 4-way valve and from
suction tube to the 4-way valve becomes almost zero.
• The temperature different between from the discharge tube to the 4-way valve and from
suction tube to the 4-way valve becomes almost zero.
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