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
page 25 of 31
fuse carrier
➨
Position cover hood on the pump.
☞
Pay attention that the metallic rear panel runs without can-
ting in the slots of the cover hood. Slide on cover hood
completely.
☞
Do not cant the cover at the ducts of the quick coupling or
the adjusting knob.
➨
Use a Hex key size 2.5 to screw in the 4 securing screws
of the cover on the rear side.
➨
Tilt device carefully onto the left side.
➨
Use a Torx screw driver TX 20 to screw in the 4 securing
screws of the cover.
Mounting the cover hood
➨
Move the variable speed drive in the slots of the base plate
to the front until the axis of the adjusting knob protrudes
the cover hood.
➨
Attach the adjusting knob of the vacuum control onto the
axis.
➨
Position the variable speed drive in the slots of the base
plate so that the adjusting knob turns without touching the
cover.
➨
Tighten the two socket head screws again.
➨
Put device back to normal operating position.
➨
Couple hose between collecting bottle and pump at the
quick coupling. Put bottle back in holder.
☞
In case the diaphragm and the valves have been replaced, a run-in period of
several hours is required before the pump achieves its ultimate vacuum.
If the pump does not achieve the ultimate vacuum:
BVC 21 NT VARIO: variable switch-off point, ultimate vacuum is reached with adjust-
ing knob turned completely to the left.
BVC 21 NT: pump is switched off automatically before reaching its ultimate vacu-
um.
If the specified ultimate vacuum is not achieved or if the BVC 21 NT does not reach
its switching point and if this does not change after the run-in period:
Check hose connectors at pump head for leaks. If necessary recheck pump cham-
ber.
Replacing the internal fuse
(BVC 21 NT VARIO)
➨
Isolate equipment from mains, remove cover hood (see
section ”Replacing diaphragm and valves”). Open fuse
carrier and replace fuse.
BVC 21 NT VARIO
:
➨
Loosen the two socket head screws holding the variable
speed drive slightly (half a turn).
☞
Attention:
Don’t undo the socket head screws completely
on any account!
Replacing the fuse
➨
