Installation Requirements - Grundfos MULTILIFT M Installation And Operating Instructions Manual

4.1 Installation requirements

The guidelines for correct mechanical installation of
lifting stations are according to EN 12056-4.
• Install the lifting station in a properly lit and vented
room with 60 cm free space around all parts to be
serviced and operated.
• Provide a pump sump below the floor level. If a
lifting station is installed in a basement with the
risk of penetrating groundwater, we
recommend (and in certain countries it is required)
to install a drainage pump in a separate pump
sump below floor level in order to drain the room.
See fig. Installation sketch.
The collecting tank, pump and cables may
be flooded (max. 2 m for 7 days).
The controller must be installed in a dry
and well-ventilated place.
• All pipe connections must be flexible to reduce
resonance.
• Lifting stations must be secured against uplift and
twist.
• All outlet pipes from lifting station, diaphragm
pump and drainage pump must have a bend
above the local backwater level. The highest point
of the bend/reversed water seal must be above
street level.
• For outlet pipes, DN 80 and upwards, install an
isolating valve in the outlet pipe. Also provide an
isolating valve in the inlet line.
• Surface water must not be discharged into the
lifting station inside the building. It must have its
own pumping station outside the building.
• Lifting stations must be provided with an approved
non-return valve according to EN 12050-4.
• The volume of the outlet pipe above the non-
return valve up to the backwater level must be
smaller than the effective tank volume.
• In general, a lifting station for black wastewater
must be vented above roof level. However, it
is permitted to lead the ventilation, as a secondary
ventilation, into the main building ventilation
system. Special vent valves (accessory) must be
placed outside the building.
• If the wastewater is discharged into a collecting
line, this collecting line must have a filling ratio of
at least h/d = 0.7. The collecting line must be at
least one nominal diameter bigger after the outlet
pipe connection.
• The controller must be placed in a flood-safe
place and be equipped with an alarm.
• Use a diaphragm pump for simple, manual
draining of the collecting tank in case of pump
failure (not obligatory).
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Related information
4.2 Installation sketches