15
English
Vacuum pumping
1. Remove the valve caps
on the liquid valve and
gas valve and the nut of
refrigerant charging vent.
2. Connect the charging
hose of piezometer to
the refrigerant charging
vent of gas valve and
then connect the other
charging hose to the
vacuum pump.
3. Open the piezometer
completely and operate
for 10-15min to check if
the pressure of
piezometer remains
in -0.1MPa.
4. Close the vacuum pump
and maintain this status
for 1-2min to check if the
pressure 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.
Leakage detection
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.
Lo Hi
liquid valve
gas valve
refrigerant charging
vent
nut of refrigerant
charging vent
valve cap
vacuum pump
piezometer
inner hexagon
spanner
close
open
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