page 30 of 76
Silencer at the outlet
Attention: Dust-laden gases, deposits and con-
densed solvent vapor can restrict air ow out
the silencer. The resultant back pressure can
lead to damage of pump bearings, diaphragms,
and valves. Under those conditions, a silencer
must not be used. Check the silencer regularly
and replace if necessary.
In case of harmful / poisonous gases or con-
densate at the outlet, remove silencer and re-
place with an exhaust tube.
The VHC
pro
allows the aspiration of excess liquids. See
manual ”VacuuHandControl VHC
pro
”.
The aspiration system doesn’t feature an air admittance
valve. If the collection bottle is under vacuum and the vac-
uum demand is reduced, the existing underpressure in-
side the bottle remains until the vacuum is reduced (pres-
sure rises) by further aspiration with the VHC
pro
.
Attention: Removing the connection tubing from the screw
cap leads to immediate venting of the collection bottle. In
systems without quick couplings, removal of the tubing at
the pump inlet will also vent the system.
Filtration
Connect the suction ask to the connection of
the VHC
pro
at the bottle head or via additional
hose nozzle (cat. no.: 638509, section “Acces-
sories), see section “Assembling a hose nozzle
at the bottle head of the BVC”.
NOTICE
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