Panasonic U-4LE2E5 Service Manual & Test Run Service Manual page 21

3. Output of PCB
4. Special Control
(3) O Valve [O ]
2 2
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)
1 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
2 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
3 Never use
EEPROM setting in indoor unit
CODE: 0B
Setting No. Function of EXCT plug short-circuit
0 Indoor unit does thermostat OFF
1 Indoor unit gives "P14"alarm and transmits the refrigerant leakage signal.
(4) Electronic Control Valves [MOV1, MOV4]
4-1. Type of Electronic control valves
MOV1 is for adjusting refrigerant flow amount of outdoor heat exchanger.
MOV4 is for adjusting refrigerant flow amount of Sub cooler.
4-2. Power Initialization
If no indoor units have started (even once) after the power supply to the outdoor unit, the MOV holds the 480
pulses (fully open).
* When the indoor unit receives the signal for operation request from the control equipment, the pulse turns
other than the 480 pulses (regardless of the thermostat ON/OFF or operating ON/OFF).
It is necessary to switch ON the power supply again if the 480 pulses are required.
4-3. Control of Electronic control valves
Electronic control valves for heat exchanger control according to the operation mode.
Mode of system
Compressor
MOV1 and MOV4 (pulse)
*1 However, 100 pulses remain for 2 minutes after unit stopped.
*2 When the outdoor unit stops and low pressure ≤ 0.16 MPa, 100 pulses remain for 30 seconds.
*3 If the outdoor unit is operating in heating mode, electronic control valves perform SH control.
SH control adjusts the difference of temperature between the liquid and gas temperature to -1 ~ 5 degrees
Celsius.
(5) Crankcase Heater Control [CH]
When the compressor stops, the crankcase heater of its own compressor is turned ON / OFF in the following
conditions.
When the outdoor air temperature < 25°C :ON
When the outdoor air temperature ≥ 27°C : OFF
*O valve is the local supply parts.
2
Stop
Stop Stop
0 0*
(factory preset mode)
Cooling
Operation Stop
480 0*
1
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2WAY VRF SYSTEM
Mini VRF SYSTEM
Control Functions
Control Functions - Outdoor unit
Heating
Operation
0 ~ 480*
2 3
1