VACUUBRAND BVC 21 NT VARIO - Manual (Page 23)

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 23 of 31
➨ Use face wrench with torque indicator (recommended:
face wrench with torque indicator from VACUUBRAND,
Cat.-No.: 637580) to assemble diaphragm clamping disc,
diaphragm and diaphragm support disc (and eventually
washers) to the connecting rod.
☞ Make sure that the square head screw of the diaphragm
clamping disc is correctly seated in the guide hole of the
diaphragm support disc.
➨ Optimum torque for the diaphragm support disc: 6 Nm.
☞ The optimum torque is achieved if the pointer in the handle
of the VACUUBRAND face wrench shows to the longer
marking line.
➨ Position new diaphragm between diaphragm clamping
disc with square head screw and diaphragm support disc.
☞ Make sure that the square head screw of the diaphragm
clamping disc is correctly seated in the guide hole of the
diaphragm support disc.
☞ Attention: Position diaphragm with pale side to diaphragm
clamping disc (to pump chamber).
Replacing the diaphragm
➨ Use a face wrench to remove the diaphragm support
disc.
➨ Check for washers under clamping disc. Make sure that
the original number is reassembled.
☞ Smaller number of washers: The pump will not attain ulti-
mate vacuum. More washers: Clamping disc will hit head
cover; noise or even blockade/damage of the pump.