Grundfos 189 Notice D'installation Et De Fonctionnement page 11

The following steps refer to fig. 7.
11. Remove enclosure part (13) together with inner parts (14).
12. Remove inner parts (14) from enclosure part (13).
13. Remove middle part (15) and diaphragm body (16).
14
Fig. 7 Dismantling the enclosure
The following steps refer to fig. 8.
14. Dismantle pin (17) and remove the lever (20).
15. Remove control piston (18) from diaphragm body (19).
51.14
18 19
Fig. 8 Inner parts
The following steps refer to fig. 9.
16. Unscrew the diaphragm rings (21) manually.
17. Remove diaphragms (51.26) from the diaphragm bodies (22).
22
21
51.26
Fig. 9 Dismantling the diaphragms and O-rings
6.5.2 Reassembling
Before reassembling make sure, that all parts are
Caution
clean, dry and undamaged!
13
51.25
15
16
17
20
22
21
51.26
The following steps refer to fig. 10.
1. Replace the O-rings (51.13) at both diaphragm bodies (22).
2. Fit the diaphragms (51.26) at the diaphragm bodies (22).
– Observe the orientation of the diaphragm. See fig. 10.
– Make sure, that the diaphragm fits into the seat and is
exactly centred on the diaphragm body (22).
3. Fit the diaphragm rings (21) and tighten them manually.
– Make sure, that the angle (A) is exactly 90 °.
The correct alignment of the diaphragms (51.26) with
Caution
the diaphragm bodies (22) is crucial for the faultless
functioning of the change-over device!
22
21
51.13
51.26
A
51.26
Fig. 10 Reassembling the diaphragm bodies
The following steps refer to fig. 8.
4. Replace the two O-rings (51.14) at control piston (18).
5. Insert control piston (18) into diaphragm body (19).
6. Reassemble lever (20) and fit pin (17).
The following steps refer to fig. 7.
7. Fit diaphragm body (16).
– Make sure, that the hole in the diaphragm body is vertically
aligned. See also fig. 10.
8. Replace the two O-rings (51.25) at the middle part (15) and fit
the middle part.
22
21
51.26
22
21
51.13
11