Zanussi PW64 Wartungshandbuch PDF herunterladen (Seite 24)

7.4 Washing system

This appliance features the conventional washing system in

which mechanical washing action is obtained from the wash pump,

which circulates water through the water circuit and rotates the two

spray arms simultaneously.

The wash pump, which is equipped with a tachometric

generator, is powered by an asynchronous motor equipped with a

starting capacitor (3µF – 450V).

The motor rotates anti-clockwise (as seen from the side of the impeller).

To optimise washing performance, this appliance offers two different washing systems:

 «ctrl»  Washing at a constant motor speed of 2800 RPM.(max. motor speed).

 «PW»  Variable-speed (pulse) washing at 1600 > 2800 RPM. This system is controlled by the

electronic control system, which sequentially activates the washing motor at two different

speeds (a minimum and maximum speed) for brief intervals.

MOTOR SPEED PERIOD OF TIME

Normal

1600 RPM



4 sec

Pulsation PW

2800 RPM



0.8 sec

The motor speeds for «ctrl» and «PW» can be programmed; for further information, see the table of cycles

for the specific model.

7.5 Level control during washing

When the fill phase is complete, the appliance shifts to the washing phase. During this phase, which

is executed with cold or heated water, the status of the pressure switch is monitored constantly to ensure

that the water system is operating efficiently, and the water level is topped up if necessary.

If the pressure switch returns to EMPTY during washing, the fill solenoid is activated for a maximum

time of S.T. x 3 (maximum total fill time).

If this time is exceeded, the washing cycle is completed but no more water is introduced. When this

occurs, an alarm [F0] is stored internally but is not shown to the user. The alarm can only be displayed to

the service technician through a specific procedure.

7.5.1 Control of wash pump

The wash pump (PL) is powered by the triac on the main board (connector F5-F7), through the door

interlock switch (IP) and the start button (PU).

The main board controls the speed of the pump motor using the signal from the tachometric

generator (T), which is connected across connectors G1-G2.

This signal is used for:

 Controlling washing systems «ctrl» and «PW»

 Controlling the safety systems on the pump motor, and the relative alarms

 Controlling dynamic filling

7.6 Heating

The heating element, which is enclosed in a tube, is used to heat the wash water (it does not operate

during drying). The element is installed on the intake to the wash pump and is connected to the tube that

feeds the upper spray arm.

The heating element (RR) is connected to relay on the main board (connector E2), the start button

(PU), and the pressure switch controlling the fill system (RL), which must be set to FULL (contacts 1-3

closed).

Two safety thermostats are installed on the heating element:

- one thermostat resets automatically (and trips at 98ºC)

- the other is a fuse (that opens at 206ºC)

The temperature of the water is controlled by the main board using the signal from an NTC sensor

(ST) connected to connectors H7-H8.

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