Heating - Electrolux Wascator W100 Service Manual

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Heating

Contactor K21 (11) controls the heating elements on electrically heated machines.
Steam heated machines have steam valve Y5 (11).
Heating cannot take place until the drum is filled with water so that the level control
shuts off (see function diagram "Water filling"). Voltage is then received by the
heating function, point E to the right in the diagram.
The timer is fitted so that heating can occur during both prewash and main wash
cycles (row 1b (10) closes during both prewash and main wash). For program P11,
described here, heating is not used during prewash. The timer advances past this
program stage as follows:
• Row 10b (6) is closed during prewash.
• When the timerr reaches stage 3, it stops (this stop is preset in the programmer)
to wait for heating to start, if called for.
• However, in stage three, row 38 (8) closes. The coil for rapid advance (9)
receives voltage and advances the timer to stage 4 without heating occurring.
During the main wash, water is heated as follows:
• One of rows 9-12 (2)-(5) in the program selector will close depending on which
program is selected. This controls which contact in the thermostat (7) will stop
the heating process.
• When the timer reaches stage 12, it stops (this stop is preset in the programmer)
to wait for the heating to be completed.
• Since rows 5b (1) and 1b (10) are closed at stage 12, relay K21/valve Y51 (11)
receives voltage and heating begins.
• Row 38 (8) is also closed at stage 12 and when the correct temperature is
reached (the change-over contact in the thermostat trips) the coil for rapid
advance (9) receives voltage resulting in the timer advancing to stage 13.
The thermostat has an hysteresis of approx. 4 C which means the contact returns
to its original position when the wash water temperature falls 4 C below the preset
value. Rows 5b (1) and 1b (10) are closed during the entire main wash cycle. This
results in the water being reheated to the correct temperature if the temperature
should fall more than 4 C below the correct level during washing.
Sequence diagram
Pre wash
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
1b. Elements
5b. Temp. Main wash
10b. Level 2
38. Rapid adv., Temp +
12. Function Sequences
Cool
Main wash
down
Rinse 4
Rinse 2 Rinse 3
Stop
Service
Manual
Drain/
Spin down
Extract.
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