Panasonic U-8ME1E81 Service Manual page 22

4. Output of PCB
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.
1
0
1
2
EEPROM setting in indoor unit
CODE: 0B
Setting No.
0
1
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.
4-8-3. Operation of MOV for heat exchanger
MOV operates according to the mode of indoor unit.
Mode of system
Compressor
MOV 1 (pulse)
MOV 2 (pulse)
*If any one compressor in the outdoor unit is operating at heating mode, both MOVs perform SH control of heat
exchanger.
SH control adjusts the difference between the liquid temperature and gas temperature to -1 - 5 degree.
This function invalid (factory preset mode)
This valve is turned OFF when the system is normal.
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.
This valve is turned OFF when the outdoor unit receives signal from the indoor unit.
Function of EXCT plug short-circuit
Indoor unit does thermostat OFF
Indoor unit gives "P14"alarm and transmits the refrigerant leakage signal.
8HP 10HP
For heat exchanger in upper row
For heat exchanger in lower row
Stop Cooling
Stop Stop Operation
0 0 480
0 0 480
*O2 valve is the local supply parts.
(factory preset mode)
12HP 14HP 16HP 18HP 20HP
For left side heat exchanger
For right side heat exchanger
Heating
Stop Operation
0 0 - 480
0 0 - 480
1 - 14
2WAY SYSTEM
Control Functions - Outdoor Unit