Elmo Rietschle V-KTN 16/26/41 - Manual (Page 22)

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Z Y
X
O
1
Maintenance and repair
d
b
Checking blades:
V-KTN 16 / 26 have 6 carbon blades and V-KTN 41
has 7 carbon blades that wear out gradually during
operation.
V-KTN 16: First check after 7,000 operating hours,
then every 1,000 operating hours.
V-KTN 26: First check after 5,000 operating hours,
then every 1,000 operating hours.V-KTN40: First
check after 3,000 operating hours then every 1,000
operating hours.
Unscrew the outlet grid (Fig. 5/G). Unscrew the
housing cover (Fig. 7/b) from the housing. Remove
the blades (Fig. 7/d) to be checked. All blades must
have a minimum height (Fig. 7/X):
Type X (minimum height)
V-KTN 15, 25
24 mm
V-KTN 40 35 mm
The blades must only be changed as a set.
Changing blades: If you detect during the blade
check that the minimum height has been reached
or it has fallen below the minimum height, the blade
set must be changed.Blow out the housing and the
rotor slot. Insert the blades into the rotor slot. When
doing this you must ensure that the blades with
the sloping side (Fig. 7/Y) point outwards and the
direction of rotation of these sloping sides (Fig. 7/
O
1
) matches that of the drilled holes for the hous-
ing (Fig. 7/Z). Screw on the housing lidFig. 6/b) and
outlet grid (Fig. 5/G). Before starting up check that
the blades run freely by moving the fan round, for it
unscrew the inlet grating (Fig. 2/G
1
):
Fig. 7 Changing blades
O
1
Direction of rotation
X Minimum height
Y Slanting side of the blade
Z Drilled holes in the housing
b Housing lid
d Blade
7.2.2 Replacing blades