Grundfos Multifit MD Series Installation And Operating Instructions Manual page 18

Fig. 19 Untightened screw in outer ring
Multilift MD lifting stations are supplied with loose
screws in the outer ring of the turnable inlet disk. See
fig. 19. Check and tighten all screws to max.
Caution
tightening torque of 9 Nm before connecting the inlet
pipe.
If the main inlet is not to be used it can easily be
plugged using a standard DN 100 pipe plug fastened
with three screws and washers.
Note
See fig. 20.
Fig. 20 Plugging the main inlet
3. Prepare optional inlets by cutting out the desired one.
Use cup drills ∅150 for DN 150, ∅100 for DN 100 and ∅43 for
DN 50 inlets. The cutting line is recessed. To avoid sharp
cutting edges, the holes must be deburred. The socket seals
are provided with collars.
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4. Prepare the connection for diaphragm pump (optional).
Use cup drill, ∅43, for DN 50 connection socket. To avoid
sharp cutting edges, the hole must be deburred.
DN 50 - ∅43
DN 100 - ∅100
DN 150 - ∅150
Fig. 21 Cutting or drilling of optional connection holes
5. Connect the inlet pipe to the tank.
Install an isolating valve between inlet pipe and lifting station
to avoid inflow during maintenance and service.
We recommend an easy-to-handle PVC isolating valve.
Fig. 22 Installation of isolating valve
Make sure that weight from inlet, discharge and vent
Caution
pipes does not rest on the tank. Long pipe sections,
valves, etc. must be supported.
Warning
Never step on the lifting station.