Dantherm HCV500 Service Manual page 33

Preventative maintenance,
Internal:
Follow this procedure to inspect and clean the internal parts:
fans,
Step
air ducts and
heating element
(2 years)
continued
Action
1 Remove the two screws on the front panel
of the unit and lift off the panel.
2 Take out a fan cabinet at random.
3 Carefully clean the fan's blades with com-
pressed air or a brush through the open-
ing at the base of the fan cabinet. All
blades must be clean in order to maintain
the fan's balance. Be careful not to remove
the small metal balance pieces on the fan's
blades as this can cause vibrations.
4 Turn the fan with the fingers and listen to
check for murmurs from the bearing. If
this is the case, the fan will probably need
to be replaced.
5 If the unit is equipped with a heating ele-
ment: clean as much as possible without
taking the fan cabinet apart. Inspect
the heating elements for visible damage.
6 Pull out the filter and inspect the ducts
visually for dirt.
If this is the case, the ducts must be
cleaned.
7 Reinsert the fan cabinet and repeat steps
1-6 with the second fan cabinet.
Illustration
Continued overleaf
33