If necessary, lift the fan motor with a lifting device or strap.
To dismount motor and fan wheel:
1. Switch off the burner from the mains.
2. Disconnect the electrical cable of the motor.
3. If in use, detach the rotation speed sensor from the motor’s fan casing.
4. Screw off screws in the motor mounting flange and lift the motor away.
5. Screw off the fan wheel fixing screw and fixing sleeve.
6. Pull out the fan wheel from motor shaft using an extractor.
7. Loosen the wedge and base bushing.
To mount motor and fan wheel:
1. Place base bushing.
2. Set the wedge into the shaft slot.
3. Pull the fan wheel to its place using a binder plug. The fan wheel lies against base
bushing.
4. Place the fixing sleeve.
5. Screw down the fan wheel with a fixing screw to the motor shaft.
6. Place the motor and attach screws.
7. Connect the electrical cable to the motor.
8. Connect the burner to the mains. Check motor rotation direction.
6.4 Dismounting and changing servomotors
The permissible tightening torque for the elastic coupling clamping
screw is 2 Nm. The permissible tightening torque for the tightening
screw is 4 Nm.
Once the servomotor has been replaced, test that both the elastic
coupling and the servomotor's axle turn freely. Either monitor the
components during the next start-up or run the servomotor to its
standby position (initial stage).
M4263 2206EN
91 (102)
