WM 220
6 Inlet valve
The inlet valve provides 3-way control of the water to direct it to the
appropriate inlets for 1) prewash and rinses, 2) main wash and 3) fabric
conditioner. A fourth inlet can be fitted for machines intended for use with
hot water supplies.
7 Heater element
The heater elements are of 1200 W and 1800 W rating respectively,
depends on the power supply arrangement (voltage and number of
phases). See Power Supply, below. Machines with heater contactor have
element with fuse.
8 Thermistor
The thermistor senses and controls the water temperature, which can be
between 0°C and 90°C. The heater is disconnected if the thermistor is
short- circuited or disconnected from the circuit board. See the fault
indication key (above).
The thermistor should have a resistance of between 60 kohm and 40
kohm at a temperature of 20-30°C.
9 Level switch
The level switches has two water levels each:
Normal wash, return level P1
Normal wash level P2
Normal rinse level P3
High wash- and rinse level P4
Overfilled P5
If the overfill level is detected, the level switch starts the outlet pump. If the
water level has not dropped within 60 seconds, the program will be
interrupted. (See fault indications, above). If the overfilling was only
temporary, the program will continue as normal.
10 Contactor
The heater contactor is controlled by the level switch, and interrupts the line
connections to the heaters.
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