Low Pressure Prevention Control (Gas Leakage Detection); 4-Way Valve Failure Protection Control; Protection Control For Cooling & Soft Dry Operation - Panasonic CU-2E15LBE Service Manual

14.5. Low Pressure Prevention Control (Gas Leakage Detection)

• Control start conditions
- For 5 minutes, the compressor continuously operates and outdoor total current is between 1.5A and 1.88A.
- During Cooling and Soft Dry operations:
- Indoor heat exchanger temperature is above 20°C.
- During heating operations:
- Indoor heat exchanger temperature is below 25°C.
• Control contents
- Compressor stops (and restart after 3 minutes).
- If the conditions above happen 2 times within 20 minutes, the unit will:
- Stop operation
- Timer LED blinks and "F91" indicated (Refrigeration cycle abnormality).

14.6. 4-Way Valve Failure Protection Control

• During Cooling operation
- 4 minutes after compressor started, if the temperature of the indoor unit heat exchanger exceeds 45°C, the compressor stops
(After 3 minutes, Time delay safety control starts).
- If this situation occurs 4 times within 30 minutes, TIMER LED blinks (F11 error)
• During Heating operation
- 4 minutes after compressor started, if the temperature of the indoor unit heat exchanger drops below 5°C, the compressor
stops (After 3 minutes, Time delay safety control starts).
- If this situation occurs 4 times within 30 minutes, TIMER LED blinks (F11 error)
14.7. Protection Control for Cooling & Soft Dry Operation
14.7.1. Cooling overload control
• Detects the outdoor pipe temperature and carry below restriction/ limitation (limit the compressor operation frequency).
• If the outdoor heat exchanger temperature exceeds 52°C during cooling / dry operation, the compressor frequency is restricted.
• If the compressor if outdoor pipe temperature exceeds 62°C.
• If the compressor stops 4 times within 20 minutes, TIMER LED blinks (F95: outdoor high pressure rise protection)
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