Service manual

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26
26. Level control
Service
Manual
1
1198
The level switch is a pressure sensor controlling
two different drum water levels by sensing air
pressure in a hose connected to the drum’s
bottom. When the water rises in the drum and
hose, the air in the hose compresses and, at two
preset pressure levels (shut-off levels), two
different alternating contacts in the pressure
sensor are activated.
When the water drains from the drum, the
contacts switch back to original position, but now
at lower water levels than was required to
activate the contacts when the drum was
being filled. These levels are called minimum
levels. If the water level during washing falls
below the minimum level, water will be added
until the shut-off level is again reached.
Control and fault tracing
All level sensors are factory-set for the various
machines. As a rule, this setting should not be
changed. For that reason, the level controls are
sealed with enamel paint.
A faulty level switch can not be repaired and
should be replaced.
The machine guarantee ceases to be valid
if the level sensor is tampered with.
Fig.
1
Fig.
2