Vacuum Pumping - Toyotomi UTN-18AP User Manual

VACUUM PUMPING

1. Remove the valve caps
on the liquid valve and
gas valve and the nut of
refrigerant charging vent.
2. Connect the
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
completely and operate for
10-15 minutes to check if
the pressure of piezometer
remains in -0.1MPa.
4. Close the vacuum pump
and maintain this status for 1-2 minutes to check if the pressure of 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.
The drain hose cannot be fl uctuant
The drain hose cannot
be fl uctuant
liquid valve
gas valve
refrigerant
charging vent
charging
nut or refrigerant
charging vent
piezometer
108
The water outlet cannot
be fl uctuant
piezometer
valve cap
inner hexagon spanner
close
open
Lo Hi
vacuum pump
GB