20
Mechanical and electrical design
Door, description
The door consists of a backing frame (1), door
(2), glass (3) and door gasket (4). The backing
frame and door are both made of enameled
aluminium. The backing frame is bolted directly
to the outer shell of the washing machine.The
door hinges are fastened on the outside of the
backing frame and the door lock (5) on the in-
side. The heat-hardened glass is mounted in the
door using a special rubber seal which also acts
as a gasket between the door and the washing
machine’s outer shell when the door is closed.
Door lock, description
The door lock consists of a circuit board (1) with
a connector. Mounted on the board are the lock
plate (2), against which the locking bolt turns to
lock the door, and a microswitch (3) which closes
when the door is shut and the handle turned.
There is also a locking device on the circuit board
which acts to lock the locking bolt in place when
the machine starts up.
The locking device consists of a double-acting
solenoid (4), a bi-metallic delay unit (5) and the
locking device itself (6) which operates sideways
in blocking the locking bolt with a stud. The
locking device can be affected by both the
solenoid and the delay unit.
The lock operates as follows:
•
When the door is closed and the door handle
is turned to move the locking bolt to the
locking position, the micro switch is activated
indicating that the door is properly shut.
•
When the machine is started by turning the
programmer knob to the "START" position
Power is removed from the locking device
solenoid, allowing the locking device to come
forward and engage the locking bolt in the
locking position. The washing machine motor
will start and water enter the machine only
after the delay unit receives the information
that the door is locked. The bi-metallic spring
in the delay unit is warmed up at the
beginning of the program.
•
Once the washing machine stops at the end of
a cycle, the solenoid pulls back the locking
stud and allows the door to open. The delay
unit is spring-mounted in the locking device
and is also pulled back by the solenoid. The
solenoid operates for about two minutes to
allow the bi-metallic spring to cool enough not
to lock the door again.
•
If current should disappear during a cycle, the
delay unit will keep the door locked for about
two minutes, ensuring that the wash water can
drain out (The drain valve opens automatically
when current is lost).
35
36
1148
1149
NOTE
Do not repair a faulty door lock.
Allways replace the old unit
with a new one, to assure prop-
er operation of the door safety
interlock.
3
2
3
4
1
5
5
6
4
2
1
Fig.
35
Fig.
36
