Pump Types - Grundfos S2 Instrucciones De Instalación Y Funcionamiento

9.4.2 Dry-installed pumps, installation types D and H
The impeller clearance can be inspected and set with the pump
installed on the pump stand and connected to the pipes.
In these pumps, the inlet cover is located between pump housing
and outer connection flange at the inlet side of the pump.
Depending on the construction, there are two ways to set the
impeller clearance.
Method 1

Pump types

Ranges 72 and 74
S2.35.xxx.xxxx.x.xxx.
S2.40.xxx.xxxx.x.xxx.
S3.50.A240.xxxx.x.xxx.
Range 78
S3.45.xxx.xxxx.x.xxx.
S3.50.xxx.xxxx.x.xxx.
S3.55.xxx.xxxx.x.xxx.
S4.50.xxx.xxxx.x.xxx.
View from direction A
Fig. 36 Impeller clearance, installation types D and H, method
1
These pump types have threaded holes for the fastening screws
(35) of the inlet cover (12a) in the pump housing (50) as shown in
fig. 36. Set the impeller clearance as follows:
1. Loosen the three set screws (12c) and close the impeller
clearance "S" by tightening the six fastening screws (35)
diagonally to move the inlet cover evenly.
Do not use too much force when tightening the
fastening screws as this may damage the bearings.
The movement is usual 0.04 to 0.12 in (1 to 3 mm.)
2. Measure the distance "L" between the inlet cover and the
pump housing at three points next to the set screws, using
feeler gauges or callipers and make a note of the distance.
3. Loosen the fastening screws and draw back the inlet cover by
0.051 in ± 0.0079 (1.3 mm ± 0.2 mm) using the three set
screws (approx. one 150 ° turn with an 1 1/8" (M27) set screw)
and the distance "L" as reference.
4. Tighten all fastening screws and check that the distance "L" at
the three reference points is stable at the new value.
Method 2
Pump types
Ranges 72 and 74
S3.45.xxx.xxxx.x.xxx.
S3.50.xxx.xxxx.x.xxx.
S3.55.A20.xxxx.x.xxx.
View from direction A
Fig. 37 Impeller clearance, installation type D and H, method 2
These pump types have threaded holes in the inlet cover (12a)
for the fastening screws (35) as shown in fig. 37. Set the impeller
clearance as follows:
1. Loosen the six fastening screws (35) and close the impeller
clearance "S" by tightening the three set screws (12c).
Tighten the screws diagonally to move the inlet cover evenly.
Do not use too much force when tightening the
fastening screws as this may damage the bearings.
The movement is usual 0.04 to 0.12 (1 to 3 mm.)
2. Measure the distance "L" between the inlet cover and the
pump housing at three points next to the set screws, using
feeler gauges or callipers and make a note of the distance.
3. Loosen the set screws and draw back the inlet cover by 0.051
in ± 0.0079 (1.3 mm ± 0.2 mm) using the six fastening screws
(approx. one 270 ° turn of an 1/2" (M12) fastening screw) and
the distance "L" as reference.
4. Tighten all set screws and check that the distance "L" at the
three reference points is stable at the new value.
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