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29
Vacuum pumping
1.
Remove the valve caps on
the liquid valve and gas valve
and the nut of refrigerant port
2.
Connect the charging hose
of manifold to the refrigerant
port, and the other to the
vacuum pump.
3.
Open manifold and allow
vacuum to pump down for
20-30 min. Manifold
should read -0.1MPa.
4.
Close vacuum pump and
watch that the manifold
remians at -0.1MPa. If
pressure decreases then
break vacuum and check
for leaks with pressure test.
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.
Use vacuum pump
liquid valve
gas valve
refrigerant charging
port
nut of refrigerant
charging port
vacuum pump
Manifold gauge
valve cap
Lo Hi
Allen/spanner
open
close
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