Panasonic U-8ME1E8E Service Manual page 21

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 8HP
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 operation according to the mode.
Mode of system Stop
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 deg.
4-8-4. Minimum MOV pulse adjustment function in heating operation
Minimum pulse which is set to 25 at the factory is able to adjust (shift).
Minimum pulse under SH control = 25 + XX
EEPROM setting in each outdoor unit
CODE: BA (for MOV1),
BB (for MOV2)
Setting No
-20
-19
0
30
This function invalid (factory preset mode)
This valve is turned OFF when the system is normal.
This valve is turnsd ON when the outdoor unit receives signal from the indoor unit
This valve is turned ON when the system is normal.
This valve is turnsd OFF when the outdoor unit receives signal from the indoor unit
Function of EXCT plug short-circuit
Indoor unit does thermostat OFF (factory preset mode)
Indoor unit gives "P14"alarm and transmits the refrigerant leakage signal.
10HP
For heat exchanger in upper row
For heat exchanger in lower row
Cooling
Stop Stop Operation Stop
0 0 480
0 0 480
XX
-20
-19
Interval of "1"
0 (
factory preset mode)
30
12HP 14HP 16HP 18HP 20HP
For left side heat exchanger
For right side heat exchanger
Heating
Operation
0 25 - 480
0 25 - 480
1 - 14
2WAY SYSTEM
Control Functions - Outdoor Unit