Panasonic U-4LE1E5, Service Manual, Page: 17 / 133

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1
Mini VRF SYSTEM
Control Functions
(1)
•
•
(2)
•
4. Other Control
4-1. Indoor Unit Self-Separator Oil Recovery Control
Refer to the indoor unit special control item.
5. Operation of Solenoid Valves
5-1. 4-way Valve Control
OFF conditions
At Cooling mode
Special control (reverse cycle start control, inter systems refrigerant oil recovery control, reverse cycle defrost
control) is in effect.
ON conditions
At Heating mode
MOV1 position (pulses) Heat exchanger status Remarks
Condenser 480
Maximum flow control
Cooling
operation
Indoor Unit
Stop 480 –
Evaporator 65 – Less than 480 SH (super heat) control
Heating
operation
Stop 0
Operation of the electronic control valve during normal unit operation
*
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.
SH control controls the difference between outdoor heat exchanger liquid temperature and suction
temperature to 1 – 5°C.
–
4. Other Control
5. Operation of Solenoid Valves
6. Outdoor Unit Electronic Control Valve (Motor Valve) control [MOV1]
SM830195-01̲Mini VRF SYS.indb 11 SM830195-01̲Mini VRF SYS.indb 11 2011/12/20 16:31:04 2011/12/20 16:31:04