Technical Information
T300 Series Clothes Dryer (Condenser)
4.2 Electronic Residual Moisture Detection Unit EF 202
A low voltage signal (approx. 33 V) is passed from the electronic unit
transformer to the timer. From there, it is returned, via the timer contacts,
to the electronic unit.
This signal then charges the capacitor C1, which is in turn discharged, via
the sensors, by the damp (conductive) load in the drum.
During the drying process, the load becomes less conductive and the
capacitor C1 is charged until the desired value (Udesired) of the first
residual moisture stage is reached. At this point, charging of capacitor C2
begins. After a further minute has elapsed, this capacitor is also fully
charged, providing that no discharge has occurred due to damp items of
laundry coming into contact with the sensors.
4.2.1 Level Control
If, either due to a fault or operator error, the condensed water container is
too full, then the level switch is activated.
The level switch sends a DC signal to the second residual moisture stage.
After approx. 3.5 seconds, this switches both the stepping relay on, which
advances the timer to the “Cool Air” cycle, and also the LED warning light.
The transistor switching stage retains this state until the machine is
switched off.
Figure 4-2: Electronic Residual Moisture Detection Unit EF 202
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