Panasonic U-4LE1E5 Service Manual page 36

3. Recovering Refrigerant
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.
START
3-2-1. Cooling operation (for all units)
Ball valve is provided in the indoor unit
3-2-2. Refrigerant recovery
procedures (A)
2
Turn off all equipment in system
When replacing or repairing a faulty
unit, let other normal indoor units run
(excluding indoor unit where refrigerant
is recovered)
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)
Other indoor units can operate normally
Replace or repair faulty unit
Check for leakage in repaired unit *
Evacuate air from repaired 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)
Open ball valve
Ready for normal operation
END
* 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.
3-2-3. Refrigerant recovery
NO
YES
NO
YES
Modify power to permit turning off
power to refrigerant-recovered
NO
YES
procedures (B)
indoor units independently
2 - 6
Mini VRF SYSTEM
Outdoor Unit Repair Procedures
Turn off all equipment in system
Replace or repair faulty unit
Check for leakage in repaired unit
Evacuate air from repaired unit
Charge refrigerant in repaired unit
(Amount of charge should equal that
recovered by refrigerant recovery unit)
Open ball valve
Ready for operation
END
Replace or repair faulty unit
Check for leakage in repaired unit *
Evacuate air in repaired unit *
Charge refrigerant in repaired unit *
(Amount of charge should equal that
recovered by refrigerant recovery unit)
Open the ball valve
Ready for normal operation
END