Other Control; Operation Of Solenoid Valves; Outdoor Unit Electronic Control Valve (Motor Valve) Control [Mov1] - Panasonic U-4LE1E5 Service Manual

4. Other Control

5. Operation of Solenoid Valves

6. Outdoor Unit Electronic Control Valve (Motor Valve) control [MOV1]

4. Other Control

4-1. Indoor Unit Self-Separator Oil Recovery Control
Refer to the indoor unit special control item.
1

5. Operation of Solenoid Valves

5-1. 4-way Valve Control
(1) OFF conditions
• At Cooling mode
• Special control (reverse cycle start control, inter systems refrigerant oil recovery control, reverse cycle defrost
control) is in effect.
(2) ON conditions
• At Heating mode
5-2. 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
1
2
EEPROM setting in indoor unit
CODE: 0B
Setting No.
0
1

6. Outdoor Unit Electronic Control Valve (Motor Valve) Control [MOV1]

6-1. Power Initialization
The valve position is 480 pulses if the indoor unit has not started once after the power was turned ON.
Operation of the electronic control valve during normal unit operation
Indoor Unit Heat exchanger status
Condenser
Cooling
operation
Stop
Evaporator
Heating
operation
Stop
* SH control controls the difference between outdoor heat exchanger liquid temperature and suction
temperature to 1 – 5°C.
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 (factory preset mode)
Indoor unit gives "P14" alarm and transmits the refrigerant leakage signal.
MOV1 position (pulses)
65 – Less than 480
*O2 valve is the local supply parts.
Maximum flow control
480
480 –
SH (super heat) control
0
–
1 - 12
Mini VRF SYSTEM
Control Functions
Remarks