Panasonic U-4LE1E5, Service Manual, Page: 34 / 133

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2
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
3-2. Refrigerant Recovery Procedures (Indoor Unit)
The flowchart below shows the refrigerant recovery procedures you must follow when replacing or repairing the
indoor unit due to trouble in the refrigerant circuit.
* Service work performed on indoor units is done simultaneously using the service ports at the
liquid tube side and the gas tube side ball valves. Refer to each section in the “Installation
Instructions” on refrigerant charging, leak checking, and evacuation procedures.
START
3-2-1. Cooling operation (for all units)
Ball valve is provided in the indoor unit
Turn off all equipment in system
Replace or repair faulty unit
Check for leakage in repaired unit
Evacuate air from repaired unit
Open ball valve
Ready for operation
END
Charge refrigerant in repaired unit
(Amount of charge should equal that
recovered by refrigerant recovery unit)
Charge refrigerant in repaired unit *
(Amount of charge should equal that
recovered by refrigerant recovery unit)
3-2-3. Refrigerant recovery
procedures (2)
Turn off all equipment in system
Other indoor units can operate normally
Replace or repair faulty unit
Check for leakage in repaired unit *
Evacuate air from repaired unit *
Open ball valve
Ready for normal operation
END END
Ready for normal operation
Open the ball valve
Evacuate air in repaired unit *
Check for leakage in repaired unit *
Replace or repair faulty unit
Charge refrigerant in repaired unit *
(Amount of charge should equal that
recovered by refrigerant recovery unit)
Change controllable number of indoor
units (including changes in group
control and integrated-control settings)
3-2-2. Refrigerant recovery
procedures (1)
When replacing or repairing a faulty
unit, let other normal indoor units run
(excluding indoor unit where refrigerant
is recovered)
power to refrigerant-recovered
indoor units independently
Modify power to permit turning off Power can independently be turned off
for indoor unit where refrigerant is
recovered
Change controllable number of indoor
units (including changes in group
control and integrated-control settings)
NO
NO
NO
YES
YES
YES
3. Recovering Refrigerant
SM830195-01̲Mini VRF SYS.indb 6 SM830195-01̲Mini VRF SYS.indb 6 2011/12/20 16:31:15 2011/12/20 16:31:15