25
Installation Manual
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 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 valve and refrigerant charging vent.
7. Reinstall the handle.
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
gas valve
refrigerant charging
vent
nut of refrigerant
charging vent
vacuum pump
piezometer
valve cap
Lo
Hi
inner hexagon
spanner
open
close
Step 7: Vacuum pumping
Step 8
：
Leakage detection
