Compressor Protection Control (Gas Leak Detection Control 2); Valve Close Detection Control; Compressor Discharge High Pressure Protection Control - Panasonic CU-2E15LBE Service Manual

15.14. Compressor Protection Control (Gas leak detection control 2)

• This control detect gas leakage condition to prevent compressor damage.
• Control start condition
- All connected indoor units capability supply ON.
- Compressor ON with maximum frequency.
- Not during annual cooling.
- Compressor discharge temperature high.
• Control content
- Compressor OFF during this control ("F91" is memorized in EEPROM)
- If the above conditions happen 2 times within 60 minutes, indoor units' Timer LED will blinks ("F91" is indicated at all indoor
units)

15.15. Valve close detection control

• This control detects 3-way valve close condition to prevent damage to refrigerant cycle.
• Start conditions:
- For all connected indoor units, if Indoor intake temperature — indoor piping temperature are between -2°C and 2°C continu-
ously for 5 minutes after compressor ON at first cooling operation.
- The first cooling operation is defined as cooling operation is ON for less than 8 minutes after new installation or after pump
down.
• Control content
- During this control, compressor stop, indoor units' Timer LED will blink. ("F91" is indicated at indoor units)
• Error reset can be done by power supply reset or reset by using remote control.

15.16. Compressor discharge high pressure protection control

• This control protect by using high pressure switch during operation.
• Start conditions
- High pressure switch is activated (from normally close to open) when outdoor operation mode is cooling or heating during
compressor running.
• Control 1 content
- Compressor stop when high pressure switch is opened and restart after high pressure switch closed. If this condition happen
4 times within 30 minutes, "F94" is indicated.
- After 30 minutes, counter is reset if this condition does not happen for 4 times.
• Control 1 stop conditions
- Power supply reset
- Reset by using remote control
55