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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 hos of the 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.
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 is a leakage
