Panasonic CS-F24DB4E5 Service Manual page 46

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.
Model Number Min. Capacity (kW)
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 Exchanger
• 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.
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)
CU-B28DBE8
CU-B34DBE8
CU-B43DBE8
CU-B50DBE8
Duration (Sec.)
5
5
46
Max. Capacity (kW)
6.3
7.3
10.2
12.7
Detection Condition
Other than compressor start control
and compressor ON
Regularly
9.8
12.3
13.8
15.8