Grundfos LC 221, Installation And Operating Instructions Manual

Page: 21 / 796

English (GB)
21
Fig. 19 Untightened screw in outer ring
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.
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.
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
T
M
05
03
36
10
11
Caution
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. tightening torque of 9 Nm before
connecting the inlet pipe.
Note
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.
See fig.
20 .
Only the screws and washers are supplied with
the lifting station. The pipe plug must be bought
separately.
T
M
05
03
29
10
11
-
T
M
05
03
52
10
11
T
M
05
12
42
25
11
TM
05 15
03 281
1
Caution
Make sure that weight from inlet, discharge and
vent pipes does not rest on the tank. Long pipe
sections, valves, etc. must be supported.
Warning
Never step on the lifting station.
DN 50 -
∅
43
DN 100 -
∅
100
DN 150 -
∅
150