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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
CU-B14DBE5
CU-B18DBE5
CU-B24DBE5
CU-B28DBE5
• 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
Discharge Temperature
Outdoor heat exchange
• 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 operations stopped except outdoor fan remaining heat removal control.
9.8.9.
Valve Error Detection Control
• This control is to protect the compressor.
• Valve error is detected if comply with condition below:
− Power is on for the first time and within 5 minutes from compressor starts (However, the unit is considered power on for first
time when compressor starts operating continuously for 7 minutes).
− Indoor heat exchanger temperature at compressor start -3°C < current heat exchanger temperature for 1 minute.
• During this error, four-way valve error is displayed; compressor is shutdown.
9.8.10. High-pressure Switch Disconnection Error Detection Control
• High-pressure switch disconnection is detected when high-pressure switch input continuously open for 1 minute while the
compressor shutdown.
• During this error, high-pressure switch error is displayed.
Min Capacity (kW) Max Capacity (kW)
5.3
6.9
5.3
6.9
6.3
9.8
7.3
12.3
Detection Threshold
< -4.5°C or
201.8°C
< -50.5°C or
103.7°C
Model Number
Min Capacity (kW) Max Capacity (kW)
CU-B28DBE8
CU-B34DBE8
CU-B43DBE8
CU-B50DBE8
Duration (Sec)
Detection condition
5
Other than compressor start control
and compressor ON
5
30
6.3
9.8
7.3
12.3
10.2
13.8
12.7
15.8
Regularly
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