28 - EN
5.4 Maintenance of the fans
Inspect the fans at least once every 4 years.
1
2
3
Remove the heat exchanger as
instructed in the maintenance
instruction of the heat exchanger:
■
Open the semi-transparent visor;
■
Change the unit to SERVICE MODE;
■
Disconnect the power to the unit;
■
Remove the 3 screws of the front
cover;
■
Remove the front cover;
■
Pull the strap of the heat exchanger.
Perform the next checks:
■
Check the flow grid for dirt and
damage;
■
Check the casing for dirt and
damage;
■
Check the fan impellers for dirt and
damage.
If necessary, clean the fans and flow
grid.
■
Use a soft brush to clean the fan
impellors;
■
Use a vacuum cleaner the remove
dust.
Take care to ensure the fan
impellers do not get damaged.
For better access to the fan follow the next steps:
1
1
2
2
3
Remove the modulating bypass valve
as instructed in the chapter “How to
remove the modulating bypass valve”:
■
Open the semi-transparent visor;
■
Change the unit to SERVICE MODE;
■
Disconnect the power to the unit;
■
Remove the 3 screws of the front
cover;
■
Remove the front cover;
■
Pull the strap of the heat exchanger.
■
Pull the clamp, located at the back
of the valve, away from the valve.
■
While holding the clamp away from
the valve pull the valve towards you.
Remove the two pressure hoses from
the fan.
Press the two holding clamps
downwards and pull the scroll housing
forwards.
4
5
6
Release the connection joint of the
modulating bypass valve.
Remove the insulation cover behind
the modulating bypass valve.
Remove the fan connectors from the
sensor cover and open them.
7
8
9
Remove the grommet including
cabling.
Lift the scroll housing out of the unit.
Remove the 5 screws on the edge of
the scroll housing to open the scroll
housing.
