Calibration Of The External Level Scale; Water Level Check; Repeatability; Linearity - Electrolux FOM 71 CLS Maintenance Manual

Calibration of the level control system

FOM 71 MP-Lab
Calibration of the level control system
For tests carried out in accordance with the IEC 604456 Ed5 standard, this
calibration does not control the supply water values of the wash program.
However, even if the wash programs use the flow meter to control water in-
take, the level control becomes active and manages other levels inside the
machine such as empty machine, heating element safety levels and overfill that
are required for the safety values of the machine. Therefore, the level must be
adjusted and maintained in accordance with the procedure outlined below.
A: Calibration of the external level scale
• Clean the left hand external level tube using a bottle cleaner (with a small
diameter) and remove all detergent deposits.
• Rotate the drum so that two lifters are equidistant relative to the lowest
point.
• Close the door and press the manual flush button to allow water into the
drum until the level reaches the inner surface of the drum.
• Check that the zero line on the external level tube matches with the level. If
it does not, adjust the scale so the that the zero level lines match up.
• Use the drain button to drain the water.
B: Water level check
1: Level calibration.
• The machine must be empty.
• Use the Level Control Program (program no. 1). The Level Control program
fills the machine 5 times to 160 mm and then to 100 mm, 130 mm, 160 mm
and 200 mm.
Measure to 160 mm on the external scale, adjusting using the rotating poten-
tiometer on the front panel if necessary. One full turn of the potentiometer cor-
responds to about 3 mm in level difference.
• Restart for second filling and check the adjustment.

2: Repeatability

• Run Level Control program (Program 1).
• Fill 5 times to 160 mm.
• Read water level each time on the external scale. Max deviation ± 5 mm.

3: Linearity

• Run Level Control program (Program 1).
• Run the last part. The program fills repeatedly to 100 mm, 130 mm, 160 mm
and 200 mm.
• Read water level at each stop on the external scale. Max deviation ± 5 mm.
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