30
VACUUM PUMPING
• Remove the valve caps on the liquid valve and
gas valve and the nut of refrigerant charging
vent.
• Connect the manometer charging hose to
the refrigerant charging vent of gas valve and
then connect the other charging hose to the
vacuum pump.
• Open the manometer completely and operate
for 10 to 15 minutes to check if the pressure of
manometer remains at -0.1 MPa.
• Close the vacuum pump and maintain this status for
1 to 2 minutes to check if the pressure remains at -0.1 MPa.
If the pressure decreases, there may be leakage.
• Open the liquid valve and gas valve completely with inner
hexagon spanner and remove the manometer.
• Tighten the screw caps of valves and refrigerant charging vent.
LEAKAGE DETECTION
• With a leakage detector, check if there is leakage.
• If leakage detector is not available, please use soapy water for leakage detection. Apply soapy water at
the suspected position and leave it there for 3 minutes. If there are bubbles coming out of this position,
there is a leak.
Lo Hi
liquid valve piezometer
valve cap
vacuum pump
close
open
inner hexagon
spanner
gas valve
refrigerant
charging vent
nut of refrigerant
charging vent
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