Service manual DW90
13
Component description
Turbo Drying Express (TDE)
Certain machines are equipped with Turbo Drying
Express, which provides more efficient drying,
among other things. Hot air is blown into the cleaning
compartment and used for drying and warming
crockery. The air is vented by the normal fan.
The nozzle that blows the hot air is fitted to the
side wall of the cleaning compartment.
Main power switch
The main power switch has 2 pins and breaks the
phase and the earth. However, power to the filters,
overflow guard, drain pump and inlet valve is not
cut when the main power switch is turned off.
On the DW90.2 the main power switch is
electronic and is integrated with the control unit.
The machine switches to standby when the main
power switch is deactivated and when the door is
closed. Standby is deactivated when the main power
switch is activated and when the door is opened.
EMC filter with inductor
The filter is fitted at the front of the bottom
plate and consists of a number of coils,
condensers and resistors.
Purpose: To eliminate electromagnetic
interference to and from the machine.
Door switch
A micro switch detects when the door has been
opened. The program is paused and power to
certain components (circulation pump, valves
and more) is cut. The program continues where
it left off when the door is closed. If a program
is running the machine indicates that the door is
open.
Purpose: To prevent the machine from running
while the door is open.
Water softener
Certain machines are fitted with a water
softener. The water softener is under the cleaning
compartment and has a cap for topping up the salt in
the bottom of the cleaning compartment. The water
softener has two chambers, one for salt and one for
ion exchange resin. It also has two electromagnetic
valves (a mixer valve and a salt valve) which control
the water flow to the salt chamber and through
the ion exchange resin. When filling with water,
the water flows through the chamber containing
the ion exchange resin where the hard water is
softened. The mixer valve is used to control whether
the incoming water flows through or bypasses the
chamber containing ion exchange resin depending
on the water hardness setting. The salt valve is used
to fill the chamber containing the ion exchange resin
with water saturated with salt from the salt chamber
when the ion exchange resin needs to be recharged.
When the salt valve opens the water pocket in the
air gap is emptied, with the water passing through the
salt chamber and into the chamber containing the ion
exchange resin.
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