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6.6. Shutting Down For Longer Periods
Should the pump have to be shut down for an longer period,
the complete pumping system must be adequately protected
against corrosion.
➡ Switch off pump.
➡ Unscrew operating fluid drain screw 43 and drain
operating fluid as per Section 6.1.
➡ Screw in operating fluid drain screw 43; keep an eye on
the position of the O-ring.
➡ Allow pump to run for about 10 seconds with open vacuum
flange. .
➡ Drain off remaining operating fluid.
➡ Fill up pump with fresh operating fluid:
Filling: UNO 250 A --> 21 l
DUO 250 A --> 18 l
If this amount of operating fluid is filled in, the level is
extremely high but this is necessary to protect all parts of the
pump against corrosion.
Before operating, the operating fluid must be
reduced to its normal level.
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