MAINTENANCE
3. If needed, use an extraction tool to pull the impeller off the
motor shaft. There is a groove in the impeller hub for the ex-
traction tool. With bigger sizes it is recommended to support
the impeller.
Size of the extraction tool needed depends on the impeller
size. Please follow the general instructions of the extraction
tool carefully.
4. Dismantle the old motor from the motor bracket.
5. Mount a new motor to the motor bracket, do not tighten the
fixing bolts.
6. Clean the motor shaft and the impeller hub hole. Use of lubri-
cation is recommended.
7. Mount the impeller on the motor shaft.
8. Mark the needed overlap to the inlet cone, see the below
illustration and table.
Fan size
“Overlap [mm]”
025
4.5
028
5.0
031
5.6
035
6.3
040
7.1
045
8.0
050
9.0
056
10.0
063
11.2
071
12.6
080
14.2
090
16.0
9. Mount the front plate and inlet cone (permanently riveted to
each other).
10. Mount the front plate supports (fan size 056 and upwards).
11. Align the impeller and check that the gap between the impel-
ler and the inlet cone is as equal as possible around the im-
peller. Also check that the overlap is correct.
12. Tighten the motor fixing bolts, reassemble and tighten the end
bolt and washer, tighten the clamp screw.
Before installing and starting the fan, make sure that there is no
mechanical contact between the impeller and the inlet cone.
7.4 FINAL INSPECTION
Check that:
• The impeller is mounted for the correct direction of rotation.
• All screws and nuts have been tightened.
• No foreign objects have been left in the fan or in the ducting.
OVERLAP
Centriflow 3D GMPM, GMEB - Installation and Maintenance
9
FläktGroup DC_9853GB_20180425_R0
Specifications are subject to alteration without notice