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4. Cable connection to the power supply through knife switch (Disconnecting means).
• Connect the approved polychloroprene sheathed power supply cable (3 x 1.5 mm
2
), type designation 245 IEC 57 or heavier
cord to the terminal board, and connect the other end of the cable to knife switch (Disconnecting means).
Note: Knife switch (Disconnecting means) should have minimum 3.5 mm contact gap.
• Secure the cable onto the control board with the holder (clamper).
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12 Operation and Control
12.1. Basic Function
Inverter control, which equipped with a microcomputer in determining the most suitable operating mode as time passes,
automatically adjusts output power for maximum comfort always. In order to achieve the suitable operating mode, the
microcomputer maintains the set temperature by measuring the temperature of the environment and performing temperature
shifting. The compressor at outdoor unit is operating following the frequency instructed by the microcomputer at indoor unit that
judging the condition according to internal setting temperature and intake air temperature.
automatically adjusts output power for maximum comfort always. In order to achieve the suitable operating mode, the
microcomputer maintains the set temperature by measuring the temperature of the environment and performing temperature
shifting. The compressor at outdoor unit is operating following the frequency instructed by the microcomputer at indoor unit that
judging the condition according to internal setting temperature and intake air temperature.
12.1.1.
Internal Setting Temperature
Once the operation starts, remote control setting temperature will be taken as base value for temperature shifting processes.
These shifting processes are depending on the air conditioner settings and the operation environment. The final shifted value
will be used as internal setting temperature and it is updated continuously whenever the electrical power is supplied to the unit.
These shifting processes are depending on the air conditioner settings and the operation environment. The final shifted value
will be used as internal setting temperature and it is updated continuously whenever the electrical power is supplied to the unit.
12.1.2.
Cooling Operation
12.1.2.1. Thermostat control
• Compressor is OFF when Intake Air Temperature - Internal Setting Temperature < -1.5
°C.
• Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature > Compressor OFF
point.
12.1.3.
Soft Dry Operation
12.1.3.1. Thermostat control
• Compressor is OFF when Intake Air Temperature - Internal Setting Temperature < -1.5
°C.
• Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature > Compressor OFF
point.
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12.1.4.
Heating Operation
12.1.4.1. Thermostat control
• Compressor is OFF when Intake Air Temperature - Internal Setting Temperature > +2.0
°C.
• Compressor is ON after waiting for 3 minutes, if the Intake Air Temperature - Internal Setting Temperature < Compressor OFF
point.
12.1.5.
Automatic Operation
• 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.
Values of T1, T2, and T3 depend on remote control setting temperature, as shown in below table. After the adjustment of T1, T2
and T3 values, the operation mode for that particular environment and remote control setting is judged and performed, based on the
above operation mode chart, every 30 minutes.
and T3 values, the operation mode for that particular environment and remote control setting is judged and performed, based on the
above operation mode chart, every 30 minutes.
There is a temperature shifting on T1, T2 and T3 if the operation mode judged is changed from Cooling/Soft Dry to Heating or vice
versa.
versa.
Example of operation mode chart adjustment:
From the above table, if remote control setting temperature = 25,
T1 = 25 + 7 = 32; T2 = 25 - 3 = 22; T3 = 25 - 7 = 18
From the above table, if remote control setting temperature = 25,
T1 = 25 + 7 = 32; T2 = 25 - 3 = 22; T3 = 25 - 7 = 18
Remote Control Setting Temperature (
°C)
T1
T2
T3
16 ~ 18
+10
-3
-5
19 ~ 22
+8
-3
-7
23 ~ 26
+7
-3
-7
27 ~ 30
+6
-3
-8
Operation Mode change from
Temperature shifts (
°C)
Cooling/Soft Dry
→ Heating
-2
Heating
→ Cooling/Soft Dry
+2
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The operation mode chart for this example is as shown in below figure and the operation mode to be performed will depend on
indoor intake air temperature and outdoor air temperature at the time when the judgment is made.
indoor intake air temperature and outdoor air temperature at the time when the judgment is made.
12.1.6.
Indoor Fan Motor Operation
A. Basic Rotation Speed (rpm)
i. Manual Fan Speed
[Cooling, Dry]
i. Manual Fan Speed
[Cooling, Dry]
• Fan motor’s number of rotation is determined according to remote control setting.
[Heating]
• Fan motor’s number of rotation is determined according to remote control setting.
ii. Auto Fan Speed
[Cooling, Dry]
[Cooling, Dry]
• According to room temperature and setting temperature, indoor fan speed is determined automatically.
• The indoor fan will operate according to pattern below.
• The indoor fan will operate according to pattern below.
Remote Control
O
O
O
O
O
Tab (rpm)
SHi
Me+
Me
Me-
Lo
Remote Control
O
O
O
O
O
Tab (rpm)
Hi
Me+
Me
Me-
Lo
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