34
Preventive maintenance,
fortsat
Internal:
Fans, air paths
and preheater
(2 years)
Follow this procedure to check and clean internal parts:
Step
Action
Illustration
1 Remove the two screws at top of the unit,
and remove the front cover
2 Pull
one random fan box out.
3 Clean the fan blades with compressed air
or with a brush through the opening in the
bottom of the fan box. Each blade has to
be so clean that the fan stays balanced.
Take care not to remove or move the met-
al balancing pieces, attached to the fan
blades.
4 Spin the fans with your fingers, and listen
for noise from the bearing. If any noise is
recognised, the fan needs to be replaced.
5 If the unit has electrical preheater in-
stalled, please clean what is possible,
without dismantling the fan box, and
check the heat tubes for any visible dam-
ages.
6 Pull the filter out, and visually inspect the
air paths inside the unit, from the duct
connectors in the top, all the way to the
exit from the fan box. If any dirt appears,
please clean it.
7 Re-insert the fan box, and redo step 1-6
with the second fan box.
Continued overleaf
