9.8.2. Outdoor High-pressure Protection Control
• The high-pressure protection control starts when high-pressure switch is activated less than 15 minutes after compressor
startup.
• During this protection control, compressor is shut down. And indoor unit is set to thermo-off status.
• After 6 occasions, high-pressure protection error is displayed; all operations stopped except outdoor fan remaining heat removal
control.
9.8.3. Discharge Temperature Protection Control
• The discharge temperature protection control starts when abnormal compressor temperature 115°C is detected when outdoor
unit is operating in cooling or heating operation.
• During this protection control, compressor is shut down. And indoor unit is set to thermo-off status.
• After 6 occasions, high-pressure protection error is displayed; all operations stopped except outdoor fan remaining heat removal
control.
9.8.4. Over Current Protection Control
• The purpose of over current protection control is to protect the air conditioner from over current.
• The over current protection control starts when input current from CT is maintained at 20A or more for 2 seconds when the
outdoor unit is starting up or during cooling or heating operation.
• During this protection control, compressor is shut down. And indoor unit is set to thermo-off status.
• After 4 occasions, over current protection error is displayed; all operations stopped except outdoor fan remaining heat removal
control.
9.8.5. CT Disconnection Detection Control
• CT disconnection detection control detects if the CT sensor works normally.
• The CT disconnection detection activates when:
− CT input value is maintained at compressor shutdown status (1.5A or less) consecutively for 2 seconds when the
compressor is operating; except deice mode.
− During this condition, compressor is shut down and indoor unit is set to thermo-off status.
− After 4 occasions, CT sensor error is displayed; all operations stopped except outdoor fan remaining heat removal
control.
− CT input value is maintained at compressor operation status (5A or more) consecutively for a period of 60 seconds when
the compressor is shut down.
− During this condition, CT sensor error is displayed.
9.8.6. Connection Capacity Protection Control
• The purpose of connection capacity protection control is to ensure the total capacity of connected indoor units is within
acceptable range.
Model Number Min Capacity (kW) Max Capacity (kW) Model Number Min Capacity (kW) Max Capacity (kW)
CU-B14DBE5 5.3 6.9 CU-B28DBE8 6.3 9.8
CU-B18DBE5 5.3 6.9 CU-B34DBE8 7.3 12.3
CU-B24DBE5 6.3 9.8 CU-B43DBE8 10.2 13.8
CU-B28DBE5 7.3 12.3 CU-B50DBE8 12.7 15.8
• During this protection control, connection capacity error is displayed; all operations stopped.
9.8.7. Sensor Disconnection Detection Control
• The sensor disconnection detection control activates when the following condition comply:
Sensor Detection Threshold Duration (Sec) Detection condition
Discharge Temperature < -4.5°C or 201.8°C 5 Other than compressor start control
and compressor ON
Outdoor heat exchange < -50.5°C or 103.7°C 5 Regularly
• During sensor disconnection, sensor error is displayed; all operations stops except outdoor fan remaining heat removal control.
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