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1.Remove t hevalvecapson
I--
the liquid valve and gas
liquid
valve
piezometer
valve and the nut of refri-
gerant charging vent.
gas valve
2. Connect the charging hose refrigerant
char_
cap
of piezometer to the refri-
vent
gerant charging vent of gas
nut of
refrigerar
valve and then connect the charging
vent
other charging hose to the
vacuum pump.
3. Open the piezometer com-
pletely and operate for
10-15rain to check if the
pressure of piezometer re-
mains in -14.5 PSI (-0.1 MPa).
4. Close the vacuum pump
and maintain this status for
1-2rain to check if the pres-
sure of piezometer remains
in -14.5 PSi (-0.1 MPa). 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.
vacuum
pump
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.
-34-
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