Daitsu ASD18UI-DA, Owner'S Manual

13

Vacuum pumping

Leakage detection

1. Remove the valve caps on 

    the liquid valve and gas 

    valve and the nut of refri-

    gerant charging vent.

2. Connect the charging hose 

    of piezometer to the refri-

    gerant charging vent of gas 

    valve and then connect the 

    other charging hose to the 

    vacuum pump.

3. Open the piezometer com-

    pletely and operate for 

    10-15min to check if the 

    pressure of piezometer re-

    mains in -0.1MPa.

4. Close the vacuum pump 

    and maintain this status for 

    1-2min to check if the pres-

    sure of piezometer remains 

    in -0.1MPa. If the pressure decreases, there may be leakage.

5. Remove the piezometer, open the valve core of liquid valve and gas valve 

    completely with inner hexagon spanner.

6. Tighten the screw caps of valves and refrigerant charging vent.

7. Reinstall the handle.

Use vacuum pump

liquid valve

gas valve

refrigerant 

charging vent

nut of refrigerant

charging vent

vacuum pump

piezometer

valve cap

Lo

Hi

inner hexagon

spanner

open

close

1. With leakage detector:

    Check if there is leakage with leakage detector.

2. With soap water:

    If leakage detector is not available, please use soap water for leakage detection.

    Apply soap water at the suspected position and keep the soap water for more 

    than 3min. If there are air bubbles coming out of this position, there's a leakage.