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21.3 Drain pump
•
When replacing the pump, please refer to the code shown in the list of spare parts
relating to the appliance.
21.3.1 General characteristics
1. Wheel
2. Rotor
3. Stator
The pump, which drains the water at the end of the various washing cycle phases, is centrifugal and is actuated
by a synchronous motor.
The rotor consists of a permanent magnet and the direction of rotation can be either clockwise or anticlockwise.
The rotor can turn by approximately a quarter of a revolution without turning the wheel. Consequently, if a
foreign body is stuck in the wheel, the rotor can perform small movements clockwise and anticlockwise until
the foreign body is released.
The flow rate of these pumps is approximately 22-25 l/min, and the maximum head is 90 cm.
Important!
Synchronous pumps, when powered on empty (disconnected from the water circuit), may not start in some
cases because their very construction makes them need an antagonist torque on the wheel to allow the rotor
to move in one of the two directions.
The pumps should therefore only be tested once fitted to the appliance, after a little water has been filled.
The drain pump is powered by the main circuit board through a triac, as follows:
For a maximum pre-determined period (and an alarm might be displayed).
Until the electronic pressure switch closes on empty, after which the pump is activated for a brief period
or moves on to the next phase.
1. PCB
13. Drain pump
Technical Support - DMM
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