MVA 02 rev 5 - December 2017
53 of 120
Step
Operation
Description
1
Positioning of support [1]
The support must be positioned on its base without fully tightening
its fixing fasteners.
2
Fitting of impeller [2] on
support
IMPORTANT:
If necessary, reduce the diameter of the motor shaft until its
nominal size is reached with a tolerance of +0/+5 microns.
Assembly with excessive play can cause vibrations. Forced
assembly creates deformations and vibrations, also making it more
difficult to remove the impeller.
After the impeller has been fitted to the projection on the support
shaft and the head washer has been fully fixed, a check must be
made to ensure that the clearance between the impeller and the
casing
(3)
is constant around the entire circumference. If clearance
is not constant, insert compensation spacers beneath the support
feet. Axial fans with
FVI
transmissions are all fitted with the type ST
one-
piece support as the standard version (see paragraph “9.1 ST
– AL – B -BL”).
3
Fixing of support
Fully tighten the support fixing nuts (see paragraphs 10.1.1 and
10.2.1 for details).
4
Fitting of guards [4]
Protect all moving parts with the envisaged guards.
Chart 5-2 Sequence of operations for assembly of version 1 fans
(refer to Fig. 5-4for the identification of components)
5.2.3
Version 9-12 axial fans
Version 9
Version 12
Fig. 5-5 Assembly of version 9 and 12 axial fans
