Miele S 4002 - Manual (Page 24)

When to change the dustbag
Change the dustbag when the colored
marker in the airflow indicator fills the
display.
The dust bags are disposable and
intended to be used only once. Do
not attempt to reuse.
Checking the airflow indicator
Perform this test with the SBD 470-3
FiberTeQ Floor Brush only, since other
attachments can affect the function of
the airflow indicator. If your vacuum
cleaner is equipped with a SBB -3
Smooth Floor Brush, the test cannot be
performed.
^ Attach the floor tool to the vacuum
cleaner.
^ Turn the vacuum cleaner on and
select the highest power setting.
^ Lift the floor tool slightly off the floor.
If the marker completely fills the
indicator window, the dust bag needs
to be changed.
How the airflow indicator works
The airflow indicator is designed to
show when the bag is full of common
household dust and to measure the
amount of air flow through the dustbag.
Normal household dust is a mixture of
dust, hair, carpet fluff, threads, sand,
etc.
However, if fine dust, such as drill dust,
sand, plaster or flour is vacuumed, the
pores of the dustbag will become
blocked. The marker will indicate that
the bag is "full" even when it is not. The
dustbag should be changed because
the suction power is greatly reduced.
If the bag is bulging with pet fur, hair,
carpet fluff, etc., the indicator may not
register "full". This is because the air
flow of the dustbag may still be high
enough not to activate the marker to
show maximum. The dustbag should
still be changed.
Maintenance and care
24