Replacing The Drive Belt - S&P HIT 1.250 Notice D'installation Et D'utilisation Succincte

 The plastic parts (levers), that move the metal shutter flaps, should not be
lubricated or greased, thus avoiding the harmful build up of dust or other
deposits that may block the mechanism.
8.5 ADJUSTING THE DRIVE BELT TENSION
To ensure the long useful life of the extractor, it is recommended that the drive
belt tension is checked directly after installation and then once every
maintenance cycle.
1. On the air input side, loosen the screws that lock the mesh fasteners, turn them
and open both meshes (Figure 6).
2. Remove the drive belt plastic protection. It is attached by a self-locking screw
and quick release joining clips.
3. Press the sides of the belt in the middle, approx. 30cm from the motor pulley;
if a distance between the sides of the belt of around 12/13cm is measured, then
the tension is correct (Figure 9).
If the distance is greater, it means the tension is below its design value and it
should be tightened, as this may cause the belt to slip and the motor to burn
out. In this case, use the motor shim plate sliding system to set the correct
value.
4. Loosen the 2 M8 nuts that anchor the motor shim plate (Figure 10).
5. Slide the motor shim plate in the opposite direction of the impeller until a
position with the adequate belt tension is achieved.
6. Tighten the 2 M8 nuts to a torque of 18Nm.
7. Replace the drive belt plastic protection, close the meshes and, finally, adjust
the screws on the devices that lock the meshes in place.
8.6

REPLACING THE DRIVE BELT

When the drive belt is frayed, with obvious signs of wear or if it is broken, it will
need replacing.
1. On the air input side, loosen the screws that lock the mesh fasteners, turn them
and open both meshes (Figure 6).
2. Remove the drive belt plastic protection. It is attached by a self-locking screw
and quick release joining clips.
3. To remove the worn belt, push the belt sides in the middle of the pulleys
towards the interior of the fan (air output side) and, simultaneously, turn the
impeller.
4. Once free of the pulleys, unhook the belt between one impeller blade, repeating
this operation for the remaining five blades.
5. Remove the two Allen screws, that are fixing the shutters open mechanism with
the central shutter. Continue removing the old belt to being replacement with
the new one.
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