Connecting The Pipes - Grundfos PS.R Series Installation And Operating Instructions Manual

4.4 Connecting the pipes

Compact the backfill around the pit up to the lower part of a pipe
connection, before connecting the pipe.
Before connecting the pipes, check the following:
• The pipes and the gaskets must be clean.
• The inlet pipe must be properly aligned with the pipe
connection.
We recommend that you provide the pit with a vent
pipe (accessory).
Place inlet and outlet pipe connections in accordance
with local regulations.
Holes for inlet pipe, electrical connection and venting are to be
drilled on site.
Mark the pit where the inlet is to be. Drill the marked spot with a
hole saw. Remove all burrs from the hole. The hole saw is
available as an accessory. See the table below.
LM50/40 40 96230763
LM50/50 50 96230753
LM50/63 63 96571523
LM50/75 75 96571527
LM50/90 90 96571528
L965/110 110 91716040
L965/160 160 91713754
LM100/
200 91712032
200
Pilot drill
4.4.1 PS.R.05 - PS.R.10
We recommend that
you drill the inlet
hole in the
cylindrical, smooth
part.
Drilling the inlet hole, ∅500-1200
Fig. 9
8
51 - 2/+ 1 96571532
60 - 2/+ 1 96571533
75 - 2/+ 1 96571534
86 - 2/+ 1 96571535
102 - 2/+ 1 96571536
127 - 0/+ 2 91713756
177 - 0/+ 2 91713755
212 - 2/+ 1 91712025
91712026
4.4.2 PS.R.17
The hole saw must have a cup depth of minimum 90
mm.
The inlet hole must not be drilled in the pit close to
pipes, float switches or other parts of the pit
installation.
Drilling from the outside
If the hole diameter is bigger than 150 mm or the hole is to be
drilled into a rib, drill in the centre of a rib. See fig. 10.
Fig. 10 Drilling from the outside
Drilling from the inside
Due to the circular pit shape, the pilot drill must extend beyond
the cutting edge of the hole saw by at least 23 mm. The position
of the hole is not an issue. See fig. 11.
Fig. 11 Drilling from the inside