05/2008 Rev. 0.6
49
1.7.2 Setting tips
Tensile force too low (fig. 4)
Tensile force correct (fig. 5)
Tensile force too high (fig. 6)
If the wiper moves over the
upper side of the cylinder it
makes no
contact with the permanent
filter, so that coffee residue is
left on the filter. The wiper does
not bend at all.
If the brewer unit is adjusted in
this way it can leak. If leakage
is severe
this can even result in a
vacuum loss, which means
that the coffee residue remains
too wet (particularly for larger
dispensing volumes).
If the brewer is adjusted
correctly, the wiper moves
carefully over the upper side
of the cylinder and pushes
the coffee residue off of the
permanent filter. The wiper
bends slightly.
When the wiper moves to
the right the coffee residue is
transported to the waste bin.
The coffee residue drops from
the right side of the brewer
straight into the waste bin.
If the brewer is adjusted too
high, the wiper will stretch
and become clearly warped.
Glancing along the long side of
the wiper will show a warped
effect in the rubber.
The brewer is under extreme
pressure and the sound of the
brewer motor audibly changes
as a sign of the severe load.
This may even damage the
wiper!
During the complete brewer
cycle, ball bearings from the
wiper arms and the tension
member are under severe
pressure, resulting in bending.
The ball bearings may then
break away, cracking the plastic
brewer housing.
Signs that the tensile force is too high (fig. 6):
The wiper is severely bent when it slides across the upper side of the brewer cylinder and
•
permanent filter.
It appears as if the wiper arm is flattened between the brewer unit and the upper side of the
•
brewer cylinder.
The brewer motor sounds as though it is running under extreme pressure.
•
The wiper pushes against the coffee residue when moving to the left.
•
Accumulation of coffee residue round the waste bin.
•
Fig. 4
Fig. 5
Fig. 6
