3
Maintenance
FläktGroup
DC_9202GB 20180403_R0
Specifications are subject to alteration without notice
0
1
2
3
4
5
6 cm N120 100 80 60
20
EUL(B,F) 11
Fig.3
BELTDRIVE LQLR AND LQLS
TO CHANGE THE BELTS
To change the belts, first move the motor towards the fan by a
sufficient amount to enable the old belts to be easily prised off the
pulleys and the new belts to be prised on. Change all the belts at the
same time. Use matched belts (with the same production number), i.e.
belts of exactly the same length.
Tension the belts according to the instructions on this page. Retension
the belts after 30 minutes of operation.
EUL(B,F) 14
Fig 4. Adjust the belt tension by moving the motor as shown in Fig. 6
INSTALLATION OF HABASIT FLAT-BELT DRIVE
CAUTION!
Never fit an ice cold and stiff belt; allow the belt to thaw out, become
flexible and pliable before fitting it. Exposure to cold impairs the
elasticity of the belt material. This will make the belt difficult to fit and
may eventually cause it to break apart at the weld.
1. Fit the motor and fan pulleys to their corresponding shafts but do
not tighten the bushes.
2. Fit the belt around the pulleys and push the motor by hand to
stretch the belt.
3. Align the pulleys by means of a straight edge and tighten the
pulley bushes.
4. Tighten the motor mounting bolts only so hard that the motor will
still be able to slide on the guide rails.
5. Measure the longest free measurement distance on the belt to the
nearest 100 mm. The belt must not be in contact with the pulleys
along the measurement distance.
6. Remove the belt, place it on a flat surface and mark off the above
measurement distance to the nearest 100 mm.
7. Refit the belt to the pulleys and tension it by means of the
tensioning screws of the motor guide rails. Keep the shafts of the
motor and fan as parallel as possible.
8. Conclude the tensioning when the belt has achieved the elongation
specified in the table.
9. Rotate the belt drive by hand in both directions. If the belt tends to
move axially in one direction or the other, this is because
the shafts are not parallel. Adjust by means of the tensioning
screws on the slide rails until the belt remains in the centre of the
pulleys when the pulleys are rotating.
10. When tensioning has been completed and the belt remains
in position when the drive is rotating, securely tighten the motor
mounting bolts. Start by tightening the bolts nearest to the pulley.
Distance between marks
Before tensioning
(mm)
After tensioning
(mm)
Type: F–0, F–1
2,8%
Type: F–14, A–2, A–3, A–4
2,5%
100
102,8
102,5
200
205,6
205,0
300
308,4
307,5
400
411,2
410,0
500
514,0
512,5
600
616,8
615,0
700
719,6
717,5
800
822,4
820,0
900
925,2
922,5
1000
1028,0
1025,0
If the belt moves sideways, adjust by means
of the tensioning screws of the guide rails or
motor bracket.
Tension the belt until
the elongation tabulated
above has been
achieved.
Use a straight
edge to check
that the pulleys
are in line.
Measur
ement distance
Fig. 5
