Wilo CronoLine-IL 250 Série Notice De Montage Et De Mise En Service page 39

Fig. 32: Permitted/impermissible installa-
tion positions
D C
Fig. 33: Example of a foundation screwed
connection
Connection of the piping
Installation and operating instructions Wilo-CronoLine IL 250...
E A B
• Only lift the pump using permitted load-bearing equipment
(see chapter 3 "Transport and interim storage" on page 27).
NOTE
Shut-off devices shall be installed in front of and behind the pump in
all cases in order to avoid having to drain the entire system when
checking, servicing or replacing the pump. If need be, the necessary
non-return valves are to be provided.
• The pipes and pump must be free of mechanical stress when installed.
The pipes must be fastened in such a way that the pump does not
bear the weight of the pipes.
• Installation position: Only vertical installation is permitted
(see Fig. 32).
CAUTION! Risk of damage to property!
Danger of damage due to incorrect handling.
• When pumping out a tank, ensure that the fluid level is always high
enough above the suction port of the pump so that the pump never
runs dry. The minimum inlet pressure must be maintained.
NOTE
In the case of insulated systems, only the pump housing may be insu-
lated, not the lantern or drive.
Example for a foundation screwed connection (Fig. 33):
• Align the whole unit when installing on the foundation with the help
of the spirit level (at the shaft/pressure port).
• Always put the washers (B) to the left and right directly at the fixation
material (e.g. stone bolts (A)) between the baseplate (E) and founda-
tion (D).
• Evenly and firmly tighten the fixation material.
CAUTION! Risk of damage to property!
Danger of damage due to incorrect handling.
• Under no circumstances may the pump be used as a fixed point for
the pipe.
• The present NPSH of the system always has to be greater than the
required NPSH of the pump.
• The forces and torques being exerted by the pipe system on the pump
flange (e.g., by warping, thermal expansion) may not exceed the per-
mitted forces and torques.
• Intercept the pipes direct before the pump and connect them without
tension. Their weight must not put a strain on the pump.
• The suction line is to be kept as short as possible. Lay the suction line
to the pump so that it continuously rises while the intake falls. Possi-
ble air entry points are to be avoided.
• If a dirt trap in the suction line is required, then its free cross-section
has to be 3-4 times the cross-section of the piping.
• For short pipes, the nominal diameters should be at least that of the
pump connections. The long pipes, the most economical nominal
diameter is to be determined on a case-by-case basis.
English
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