Mitsubishi City Multi PURY-P400 - Location of Leaks: Outdoor Unit (Cooling Mode); Location of Leaks: Extension Piping or Indoor Units (Heating); Location of Leaks: Outdoor Unit (Heating)

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8 PREPARATION, REPAIRS, AND REFRIGERANT REFILLING WHEN REPAIRING
LEAKS
[1] Location of leaks: Extension piping or indoor units (when cooling)
(Pump down operation)
1 Attach a pressure gauge to the low-pressure servicing check joint (CJ2).
2 Stop all of the indoor units. When the compressor has stopped, shut off the liquid ball valve (BV2) for the outdoor
unit.
3 Stop all of the indoor units. When the compressor has stopped, turn the SW3-6 switch on the main board for the
outdoor unit to ON. (This will start the pump down operation, causing all of the indoor units to enter the cooling
mode.)
4 While in the pump-down operation (SW3-6 ON), the low pressure (LPS) will reach below 0.20 MPa, or the indoor
unit and the compressor will automatically shut down within 15 minutes of starting the pump-down operation.
Shut down all of the indoor units and the compressor if the pressure gauge for the low-pressure servicing joint
(CJ2) reads 0.15 MPa or after running the pump down operation for 20 minutes.
5 Shut off the gas ball valve (BV1) for the outdoor unit.
6 Remove any refrigerant remaining in the extension piping and the indoor units.
Be sure to recover the refrigerant without releasing it into the air.
7 Repair the location of the leak.
8 After repairing the leak, create a vacuum to remove any air from inside of the extension piping or the indoor
units.
9 Open the ball valves for the outdoor unit (BV1 and BV2), turn the SW3-6 switch to OFF, adjust refrigerant levels,
and confirm proper circulation.