Elmo Rietschle V-DTN 6/10/15/25/40 - Manual (Page 21)

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Z Y
X
O
1
Maintenance and repair
d
b
7.2.2 Replacing blades
Checking blades: V-DTN 6 - 25 have 6 carbon
blades and V-DTN 40 has 7 carbon blades that wear
out gradually during operation.
V-DTN 6, V-DTN 10 and V-DTN 15: First check after
7,000 operating hours, then every 1,000 operating
hours.
V-DTN 25: First check after 5,000 operating hours,
then every 1,000 operating hours.V-DTN 40: First
check after 3,000 operating hours, then every 1,000
operating hours.
Unscrew the outlet grid (Fig. 4/G). Unscrew the
housing lid (Fig. 6/b) from the housing. Remove the
blades (Fig. 6/d) to be checked. All blades must
have a minimum height (Fig. 6/X) of:
Type X (minimum height)
V-DTN 6, 10 20 mm
V-DTN 15, 25 24 mm
V-DTN 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. 6/Y) point outwards and the
direction of rotation of these sloping sides (Fig. 6/O
1
)
matches that of the drilled holes for the housing
(Fig. 6/Z). Screw on the housing lid (Fig. 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. 6 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