Panasonic U-8MF2E8 Service Manual page 24

4. Output of PCB
4-6. By-Pass Valve [BPV]
This valve is for pushing the oil in the balance piping into other outdoor unit.
This valve turns ON when the oil level of compressor is "2" or "1" in its own outdoor unit and the oil level of
compressor is "0" in other outdoor unit.
* This valve turns ON for 10 seconds and turns OFF for 20 seconds. This operation is repeated while oil is
supplied to others.
* For more information on oil level of compressor, refer to "Oil Control" section.
1
4-7. Refrigerant Interception Valve [O2]
This valve works when the outdoor unit receives signal of the refrigerant leakage from the indoor unit.
The indoor unit that transmits the signal of the refrigerant leakage gives "P14"alarm.
To activate this function, it is necessary to set it to EEPROM on the main outdoor PCB and indoor PCB.
EEPROM setting in main outdoor unit
CODE: C1
Setting No.
0 This function invalid (factory preset mode)
This valve is turned OFF when the system is normal.
1
This valve is turned ON when the outdoor unit receives signal from the indoor unit.
This valve is turned ON when the system is normal.
2
This valve is turned OFF when the outdoor unit receives signal from the indoor unit.
4-8. MOV for Heat Exchanger [MOV1, MOV2]
4-8-1. Type of Motor Operated Valves
Outdoor unit capacity
MOV1
MOV2
4-8-2. Power Initialization
If no indoor units have started (even once) after the power supply to the outdoor unit, the MOV for heat exchanger
holds the pulse at 480 pulses.
8HP ~ 16HP
For left side heat exchanger
For right side heat exchanger
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3WAY SYSTEM
Control Functions