Vacuum Pumping - Friedrich MWM18Y3J Installation And Operation Manual

Vacuum pumping

Use vacuum pump
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
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.
refrigerant charging
port
nut of refrigerant
and allow
charging port
liquid valve
gas valve
29
Manifold gauge
valve cap
vacuum pump
Allen/spanner
close
open
Lo Hi