Specifications

-199-

• 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 gage 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 belo

down operation. Shut down all of the indoor units and the compressor if the pressure gage 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.

w at least 0.20 MPa

or the indoor unit and the compressor will automatically shut down within 15 minutes of starting the pump