0.7 Risk of Pump Damage
1 With the pump filled with oil it must placed such that it will deviate by
no more than 2° from the vertical axis as otherwise oil can enter into
the sealing system. Before filling the pump with oil, align it.
Transporting the pump filled with oil is not permissible.
2 Always use the intake screen which has been fitted as standard and
clean it regularly. The intake screen serves to protect the pump. Small
items (screws, welding beads, pieces of wire, etc.) which during instal-
lation work inadvertently fall into the intake line or are sucked in, are
retained by the intake screen.
The intake screen does not replace a filter. Prevent the intake of parti-
cles from the side of the process by fitting suitable filters. Upstream fil-
ters protect the pump against damage to the pump chamber.
3 When pumping dust containing media, install a dust filter in the pro-
cess gas flow upstream with respect to the pump.
4 When connecting the pump, provide a suitable valve on the intake side
for the purpose of shutting off the intake line so as to prevent the
pump from turning backwards in the event of a power failure.
Otherwise the pump may suffer damage or oil may contaminate the
pump chamber by reverse venting via the shaft seals.
5 Lines and other vacuum connections should be clean and free of oil.
Special attention must be paid here when oil-sealed pumps have been
used on the vacuum side. Check the conditions before initial commis-
sioning. In the case of deviations, the pump can suffer contamination
with oil residues.
6 The pressure within a pump which has been switched off will increase
to ambient pressure within a few seconds. In such a case the pump is
vented through the discharge and the shaft seal drain. We recommend
to fit a nonreturn discharge valve so as to prevent the pump from turn-
ing backwards.
7 The discharge line should be laid so that it slopes down and away
from the pump so as to prevent condensed vapours from backstream-
ing into the pump.
8 In the case of wet processes we recommend the installation of liquid
separators, upstream and downstream of the pump so as to avoid the
influx of liquid into the pump.
9 During installation work on the intake and discharge lines do not sub-
ject flanges to any stresses. Check the rubber elements of the pump’s
feet as to any deformation.
10 Protect the electric motor against being overloaded:
For proper connection, a suitable motor protection switch must be
used. Set this motor protection switch in agreement with the informa-
tion provided on the motor nameplate.
Connect the pump to the correct mains voltage and mains frequency.
NOTICE
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