19
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 locking bolt has locked the door.
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 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 locking bolt
is turned to lock position, the micro switch will
indicate that the door is closed.
•
When the machine is started, the solenoid
actuates the locking device, blocking the door
lock. The locking device signals the delay
unit, closing a switch in the unit. 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).
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.
31
Fig.
32
31
32
