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56
Mechanical and electrical design
Heating
Description
The machine elements are in the lower part of
the outer drum, accessible from the machine
front. They are switched in by heating relays,
controlled by the program control unit. For input
voltage 400-440 V one heating relay is used
(K21), and for 208-240 V, two are used (K21 and
K22).
The program control unit prevents the elements
from being switched in when there is no water in
the drum. If some fault should arise which
causes the elements to heat with no water in the
drum, their own fuses will blow.
Fault-finding
To be carried out by authorised personnel
only.
If heating time is abnormally long:
•
Check with a multimeter to see if one of the
elements is burnt out. For access to the
elements, remove the machine’s front panel.
•
Build-up of limescale can reduce the
efficiency of the elements. If necessary
descale them with a suitable descaling
product. Follow the manufacturer’s
instructions concerning quantity of descaler.
65
4728
4742
66
Sensor,
thermostat
Element
Fig.
65
Fig.
66
3AC
3
5
3
1
6
4
2
K21
5
3
1
6
4
2
K22
S1
L1
S1
L2
S1
L3
E1-
E3
S1
L1
S1
L2
S1
L3
3N
EL
5
K21
3
1
6
4
2
E1-
E3
3NAC