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Vacuum pumping
Use vacuum pump
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 piezo-
meter 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.
7. Reinstall the handle.
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.
liquid valve
refrigerant charging vent
valve cap
nut of refrigerant charging vent
37
piezometer
Lo
gas valve
valve cap
vacuum pump
inner hexagon spanner
close
open
Hi
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