WM2277 WASHER PAGE 61 of 84 TRAINING MANUAL
WATER LEVEL SWITCH
The water level detector switch monitors the water level and feeds this
information to the MICOM. The sensor reads air pressure in an air chamber on
the tub. The air pressure changes in relation to the depth of the water, moving a
diaphragm in the switch. As the water level fluctuates, it raises or lowers the iron
center in the coil, which, in turn, changes the electric resonance of the oscillator
circuit of which it is a part. As water level decreases, frequency increases.
(e.g. A low water level may read 25.5kHz, while a high water level may read 21.4
kHz. These readings are approximate; washers in the field may vary slightly from
these figures.)
Press DELAY WASH and BEEPER simultaneously. The display will indicate
the water level frequency. Multiply by 0.1 to get the frequency in kilohertz.
For example, a reading of 255 would be multiplied by 0.1 to get 25.5 as the
frequency.
The pressure sensor (water level
switch) is mounted on a bracket
attached to the main board. Be sure to
unplug the machine to service this
component, because it is live even
when the machine is off.
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