FRANCO KF53, Manual

Page: 23 / 52

23 KF_U210700
EN
7.4 ADJUSTMENT OF THE BELT TENSION DRIVE
WARNING
Never perform maintenance with circulator running.
Before any operation is required prior disconnecting the circulator
from the mains power supply.
The circulator, in the preassembled versions, comes with correct
tensioning of the drive belt (pos.12).
In the versions to be assembled, the following procedure must be
followed for correct belt tensioning during installation.
To ensure greater duration of the circulator, it is advisable to
check the tensioning of the belt at the end of installation and each
time a maintenance cycle is performed.
1. Remove the safety netting, air inlet side, by loosening the
screws present on the net fastening devices (pos. 15).
2. Press the branches of the belt in the intermediate zone, about
30 cm from the motor pulley, and if there is a distance between
the branches of the belt of about 12/13 cm, it means that the
tension is correct. If there is a lower distance, it means that the
tension is below the design value.
30cm
12/13cm
In this case the the adjustment of slippage system allows the
correct value to be restored.
3. Loosen the 2 screws TBEI 8x16 and the 2 M8 nuts that secure
the motor plate (pos. 5).
4. Slide the motor plate in the opposite direction to the propeller
until reaching the position with optimum belt tension.
5. Retighten the 2 nuts and the 2 screws to the torque required by
section 7.5 “Screw tightness check.”
6. Relocate the safety netting and tighten the screws to the locking
of the device
7.5 SCREW TIGHTNESS CHECK
WARNING
Never perform maintenance with circulator running.
Before any operation is required prior disconnecting the circulator
from the mains power supply.
Regularly check the tightness of the bolts and nuts in the
following points:
• Screws M8 motor mounting and motor plate, specified torque:
- 18 Nm
•
screw between the pulley and motor, torque required:
- 10 Nm (M6 screws) using threadlocker (medium strength)
CAUTION
Incorrect values in the torque can cause damage to the
equipment!
7.6 REPLACEMENT OF THE DRIVE BELT
WARNING
The maintenance of the circulator must be performed only by
trained personnel in compliance with safety standards and
requirements set forth in this Manual.
Before connecting to the mains, isolate the power line by
opening the main switch
.
When the belt is frayed, with obvious signs of wear, or in the case
of tears, it is necessary to replace it.
1. Remove the safety netting, air inlet side, by loosening the
screws present on the net fastening devices (pos. 15).
2. To remove the worn belt, push the branches of the belt in the
intermediate area to the pulleys towards the inside of the fan
(toward the air outlet side) and simultaneously rotate the propeller.
Once freed from the pulleys, remove the belt between a
propeller blade and the orifice by repeating this process for the
other two blades.
3.
Insert a new drive belt between a propeller blade and the orifice,
working accordingly for the other 2 blades.
4. Fit the belt on the motor pulley and as far as possible on the
driven pulley, then rotate the propeller with force to lift the entire
belt into the groove of the driven pulley.
5.
Check the deflection of the V-belt, if the tension is too low
please adjust. The motor plate position to obtain the deflection
indicated in the preceding paragraph.
6. Relocate the safety netting and tighten the screws to the locking
of the device
7.7 TROUBLESHOOTING
WARNING
The repairing of the circulator must be performed only by
trained personnel in compliance with safety standards and
requirements set forth in this Manual.
Before any type of repair, isolate the power line by opening
the main switch.
Problems of non-operation may be due to the following causes:
• the main switch is off;
•
incorrect adjustment or failure of the automatic control;
Nuts M8
Screws
TBEI 8x16