Wilo -Stratos GIGA2.0-I Einbau- Und Betriebsanleitung Seite 230

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Fig. 101: Correct position of the impeller nut
after installation
Fig. 102: Motor impeller unit
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CAUTION
Damage due to incorrect handling!
The impeller is attached with a special nut whose installation requires a
particular procedure described below. If the installation instructions are
not observed, there is a danger of overtightening the thread or of endan-
gering the pumping function. The removal of damaged parts can be very
difficult and result in damaging the shaft.
Apply thread paste to both impeller nut threads for every installation. 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 subsequent
dismantling impossible.
⇒ Version with plastic impeller and cone connection (Fig. I)
3. Insert an open-end wrench (22 mm width across flats) into the lantern window and hold
the shaft by the wrench flats (Fig. 100, Item 1).
4. Screw the impeller nut into the impeller hub as far as it will go.
5. Screw the impeller together with the impeller nut hand-tight onto the shaft. Do not
change the position achieved in the previous step. Never use a tool to tighten the im-
peller.
6. Hold the impeller and manually loosen the impeller nut by about two rotations.
7. Screw the impeller together with the impeller nut onto the shaft again until friction res-
istance increases. Do not change the position achieved in the previous step.
8. Hold the shaft with open-end wrench (22 mm width across flats) and tighten the im-
peller nut to the prescribed tightening torque (see table "Tightening torques" [} 145]).
The nut (Fig. 101, Item 1) has to be about ±0.5 mm flush with the end of the shaft
(Fig. 101, Item 2). If this is not the case, release the nut and repeat steps 4 – 8.
9. Remove the open-end wrench and reinstall the protective plate (Fig. I/III, Item 27).
⇒ Version with cast impeller and parallel key connection (Fig. III)
10. Install the impeller with washer(s) and nut, countering at the impeller's outer diameter
while doing so. Avoid damage to the mechanical seal due to jamming.
11. Clean the lantern groove and insert the new O-ring (Fig. I, Item 19).
12. Attach motor impeller unit to the transport lugs with suitable lifting equipment for pro-
tection. When attaching, avoid damaging plastic parts such as the fan wheel and the up-
per part of the electronic module.
⇒ The following applies to plastic and cast impellers:
13. Insert the motor impeller unit (see Fig. 102) into the pump housing in the old or another
desired angular position. Observe permitted installation positions of the components
(see section "Permitted installation positions and change of the arrangement of com-
ponents before installation" [} 140]).
14. The use of mounting bolts is recommended (see section "Accessories" [} 135]). Once
the lantern guide has firmly engaged, (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. I/III, Item 10 or Fig. III, Item 29), the fixation material can be
removed from the transport lugs.
15. Screw in the screws (Fig. I/III, Item 10 or Fig. III, Item 29) but do not tighten them all the
way. The motor impeller unit is drawn into the pump housing whilst the screws are being
screwed in.
CAUTION
Damage due to incorrect handling!
While screwing in the screws, check that the shaft can be turned by
slightly turning the fan wheel. If the shaft is difficult to move, tighten the
screws alternately and diagonally.
Installation and operating instructions • Wilo-Stratos GIGA2.0-I, Wilo-Stratos GIGA2.0-D • Ed.02/2022-07