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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 operation 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 operation 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 operation 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 operation 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.
• 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:
• During sensor disconnection, sensor error is displayed; all operations stops except outdoor fan remaining heat removal control.
9.8.8. Four-way Valve Error Detection Control
• The four-way valve error detection control starts when:
- During cooling operation, when indoor heat exchanger temperature exceeds 45°C in 5 minutes after compressor starts.
- During heating operation, when indoor heat exchanger temperature is below 5°C in 5 minutes after compressor starts.
• During four-way valve error, compressor is shut down and indoor unit is set to thermo-off status.
• After 3 occasions, four-way valve error is displayed; all operation stopped except outdoor fan remaining heat removal control.
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
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 Exchanger < -50.5°C or 103.7°C 5 Regularly
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