Wilo Stratos GIGA Série Notice De Montage Et De Mise En Service page 120

English
1
2
Fig. 53: Correct position of the impeller nut
after the installation
114
thread or of harming the pumping function. The removal of damaged
parts can be very difficult and lead to damaging of the shaft.
• Apply thread paste to both impeller nut threads for every installa-
tion. The thread paste has to be suitable for stainless steels and for
the permitted operating temperature of the pump (e.g. Molykote
P37). Dry assembly can lead to thread seizing (cold welding) of the
thread and make the next dismantling impossible.
24. During the assembly of the impeller, put an open-end wrench
(22 mm is the best width across flats) into the lantern window and
hold the shaft steady with the wrench surfaces (Fig. 52, Item 1).
25. Screw the impeller nut into the impeller hub as far as it will go.
26. Tighten the impeller together with the impeller nut on the shaft
by hand without changing the position achieved in the previous
step. Do not use a tool to tighten the impeller.
27. Hold the impeller and manually loosen the impeller nut by about
two rotations.
28. Without changing the position achieved in the previous step 27,
tighten the impeller together with the impeller nut on the shaft
again until increasing friction resistance occurs.
29. Hold on to the shaft (see step 24) and tighten the impeller nut
with the specified tightening torque (see list "Table 11: Screw
tightening torques" on page 115). The nut (Fig. 53, Item 1) has to
be about ±0.5 mm flush with the end of the shaft (Fig. 53, Item 2).
If this is not the case, release the nut and repeat steps 25 to 29.
30. Remove the open-end wrench and reinstall the protective plate
(Fig. 7, Item 18).
31. Clean the lantern groove and insert the new O-ring (Fig. 7, Item 11 ).
32. Attach the motor impeller unit to the transport eyes with suitable
lifting equipment for the purpose of safeguarding. When attach-
ing, avoid damaging plastic parts, such as the fan wheel and the
upper part of the electronic module.
33. Insert the motor impeller unit (see Fig. 13) into the pump housing
in the old position or another desired angular position. Observe
the permitted installation positions of the components when
doing this (see chapter 7.1 "Permitted installations position and
change of the arrangement of components before the installa-
tion" on page 83). The use of mounting bolts is recommended
(see chapter 5.4 "Accessories" on page 72). After the lantern
guide has been firmly locked into place (about 15 mm before the
end position), there is no longer any danger of tipping or tilting.
After the motor impeller unit has been secured with at least one
screw (Fig. 7, Item 3), the attaching material can be removed from
the transport eyes.
34. Screw in the screws (Fig. 7, Item 3) but do not tighten them all the
way. When screwing in the screws, the motor impeller unit will be
pulled into the pump housing.
CAUTION! Risk of property damage!
Danger of damage due to incorrect handling!
• While screwing in the screws, ensure that the shaft can be turned
by turning the fan wheel a bit. If the shaft is difficult to move,
tighten the screws alternately and diagonally.
35. Rescrew in the two screws (Fig. 7, Item 21) in case they were
removed. Clamp in the holder (Fig. 7, Item 6) of the differential
pressure sensor under one of the screw heads (Fig. 7, Item 3) on
the side opposite the electronic module. Then tighten the screws
(Fig. 7, Item 3) for the last time.
36. If applicable, remove the spacers that you moved in step 8 from
the drilled holes on the motor flange (Fig. 7, Item 20a) if necessary
WILO SE 10/2017