Notice – VACUUBRAND BVC 21 NT VARIO User Manual
Page 14
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product. Manual-no.: 999157 / 10/12/2009
☞
Check liquid level regularly. If neces-
sary drain separator.
➨
Loosen union nut.
➨
Remove separator. Drain condensate.
➨
Assemble separator again, Tighten un-
ion nut hand-tight.
BVC 01:
When connecting a vacuum pump at the pressure control device:
Maximum permit-
ted power draw at the connection of the vacuum pump: 6A ohmic, 1.5A inductive.
Draining the separator:
separator
union nut
Attention: In case of supply voltage below 100V, the lock of the cutout might be
restricted and the pump might restart on its own after sufficient cooling down. Take
suitable precautions, if an automatic restart of the pump may lead to a critical dan-
gerous situation.
After a power cut the system will automatically start again.
BVC 21 NT:
The vacuum pump operates at constant speed and is switched by an automatic
pressure control as necessary. Thus the collecting bottle provides the necessary
vacuum for the next aspirations. Avoid too frequent switching (> 5 switch points per
minute) of the vacuum pump (e.g. due to air intake).
BVC 21 NT VARIO:
The vacuum inside the collecting bottle can be controlled with the adjusting knob
(VACUUM) at the front of the device.
When turning the knob to the left (”+”, more vacuum), the diaphragm pump provides
a lower pressure inside the collecting bottle. The suction power is increased. If the
adjusting knob is turned to the right (”-”, less vacuum), the pump provides less
vacuum inside the bottle.
The speed of the pump is adapted via an internal control to the respective vacuum
demand. There is no abrupt switching of the pump. If the demanded vacuum level
inside the bottle is reached, the pump reduces its speed down to standstill.
Attention: If the adjusting knob is turned completely to the left or close to the stop
at the left (in direction ”+”, more vacuum), the vacuum demand might be below the
ultimate vacuum of the diaphragm pump. Thus the pump will run continuously at
highest speed. To avoid this mode of operation, reduce the vacuum demand slightly.
The vacuum pump will then reduce its speed automatically down to standstill once
the ultimate vacuum is reached.
The aspiration system doesn’t feature an air admittance valve. I.e. if the collect-
ing bottle is under vacuum and the vacuum demand is reduced (turning the adjust-
ing knob to the right), the existing underpressure inside the bottle remains until the
vacuum is reduced by further aspiration with the VHC (pressure rise in the collecting
bottle).
Avoid frequent switching on and off. After switching off wait 2 minutes before switch-
ing on again.
NOTICE