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Expansions of the pipes caused by temperature must be compensated by
appropriate means. We recommend the installation of compensators between
pump and pipe. Sudden closing of valves in pipes must be avoided. The
resultant pressure impacts caused by such shut offs often exceed the max. per-
missible housing pressure of the pump by far. To absorb sudden pressure
impacts, dampers or expansion tanks must be installed.
Caution: The ABS-glue-connections, glue socket (721), require a longer harde-
ning period. A minimum 12 hours must be admitted between the gluing and the
first start-up of the pump.
5.3
CAUTION
Mechanical / Hydraulic
The pump must be installed in a horizontal position in dry condition. It may be
installed either max. 5 m below (gravity feed) or above of the liquid level (sucti-
on mode). Thereby the geodetic head between liquid level and pump inlet must
not exceed 3 m. The suction lift may be significantly reduced by flow resistance
in the suction line, if the pipes are very long and/or insufficiently dimensioned.
The suction pipe dimensions in the table are only valid for suction pipes not
longer than 5 m. With longer pipes the flow resistance increases and suction is
impaired. Danger of cavitation is also increased. Make sure that the suction
line is not leaky, otherwise the pump will prime insufficiently or not at all.
The transparent lid must be screwed on tightly and the suction/intake line
should be as short as possible. This will reduce priming time, which is depen-
dent on the air volume in the intake line. If the intake line is very long this may
take up to 12 minutes. If possible the intake line to the pump should be installed
below the liquid level. Whenever the pump is installed above the liquid level it is
recommended to install a foot valve in the intake line. Thus the suction pipe
cannot drain itself when the pump has been turned off. This keeps priming
times short e.g. after having cleaned the strainer basket (143).
5.4
Electrical: All electrical connections should be performed by a qualified
expert only!
Make sure all parts are free of tension before doing any maintenance work or
electricians work.
Please make sure that the electrical installation has a disconnecting device,
which allows disconnecting from the power supply with a minimum of 3 mm
contact gap at each pole. This pump is built according to Protection
45
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