Page 460 - 3K_e-Catalogue 2018

8.3 MAINTENANCE ON THE FANS OF THE AMBIENT AIR RECIRCULATION SYSTEM

The following instructions must be complied with when performing maintenance on the fans of the ambient air recirculation
system, notwithstanding conformity to all the safety obligations deriving from the equipment use:

1) Verify the general condition: corrosion, mounting and cleanliness.
2) Verify the noise of the motor.
3) Verify the impeller: vibration, imbalance.
4) Verify the absorbed current.
5) Clean the impeller and the motor.

8.3.1 REPLACING THE FANS
The following instructions must be complied with when replacing the fans of the ambient air recirculation system,
notwithstanding conformity to all the safety obligations deriving from the equipment use:

1) Set the main switch to "0".
2) Open the panels of the plenum.
3) Disconnect the electrical connections from the terminal block of the fan.
4) Remove the fan from its seat.
5) Replace with an original spare.
6) Connect the electrical connections from the terminal block of the fan
7) Close the panels of the plenum and set the main switch back to "I".

8.3.2 MAINTENANCE ON OR REPLACEMENT OF THE CONTROLLER OF THE FANS OF THE AMBIENT AIR RECIRCULATION
SYSTEM
Refer to the provided manual of the controller of the fans of the ambient air recirculation system to perform maintenance
on it.

INSTALLATION AND MAINTENANCE 31