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.: 999155 / 29/01/2009
page 17 of 36
Use and operation
Installing in a vacuum system
• Connection lines at the pump inlet have to be gas tight. Particles and dust must
not be aspirated, the user has to provide appropriate filters if necessary. The user
must ensure their suitability concerning gas flow, chemical resistance and safe-
ness against clogging prior to use.
• Connect an exhaust line gas tight at the pump outlet if necessary. Always dispose
of exhaust gases appropriately (e.g. into a fume hood). If there is risk of release of
dangerous or polluting fluids, install an appropriate system to catch and dispose
of those fluids.
• Reduce the transmission of vibration and prevent mechanical load due to rig-
id pipelines. Insert elastic hoses or flexible elements as couplings between the
pump and rigid pipes.
Attention:
Flexible elements tend to shrink when evacu-
ated.
• The gas outlet must never be blocked. The exhaust line has always to be free
(pressureless) to ensure an unimpeded discharge of gas.
• A power failure may cause unintentional ventilation of the pump. In case this con-
stitutes a potential source of danger, take appropriate safety measures.
•
Pump with dual-voltage motor
: Check that the voltage changeover switch at
the terminal box is positioned correctly.
Attention
: If the pump is switched on with wrong voltage selection, the motor
may be damaged!
Before starting the pump, check that the voltage changeover switch at the termi-
nal box is correctly positioned.
Change the selection at the voltage changeover switch only if the pump is
separated from mains.
Voltage changeover switch:
Use a screw driver to adjust the supply voltage on the
voltage changeover
switch
at the terminal box of the pump:
”115” corresponds to 90-126 V and
”230” corresponds to 180-253 V.
• Make sure ventilation is adequate especially if the pump is installed in a housing
or if the ambient temperature is elevated. Provide external ventilation if neces-
sary.
ME 4R NT
• When operating the device as a
compressor
ensure that the maximally gener-
ated overpressure is compatible with the mechanical stability of the pressure
vessel. If necessary install an overpressure safety relief device.
• When
operating the equipment as vacuum pump
make sure that the exhaust
pipeline cannot get blocked. Ensure a free (pressureless) exhaust of gases.
Avoid throttling losses by using connecting pipes with large diameter and by keeping
them as short as possible.
Install outlet pipelines always falling to avoid backflow of condensate towards the
pump.
voltage changeover switch
NOTICE
