ADL 2010 / 01 26/57 599 72 63-27
7.4 Heating unit
The heating unit is made up of two heating elements with different powers, inserted in ceramic supports and
the whole surrounded by a sheet metal casing.
Two normally closed safety thermostats are fixed to one side of the container:
TH1 with automatic reset (2) which triggers at a temperature of 92°±3°C and cuts the power supply to
the two heating elements,
thermostat TH2 (3) triggers at 125°C and, after opening the contact, it remains in this state and cuts the
power supply to the heating unit permenantly.
A. Heating element filament
B. Safety thermostat with automatic reset TH1
C. Safety thermostat TH2
D. Ceramic supports
E. Sheet metal casing
Rated power (W) Resistance 20°C (Ω)
Volt (V) Branch A (1-3) Branch B (2-3) Branch A (1-3) Branch B (2-3)
230 1400 700 33,89 67,78
230 1400 800 33,89 59,75
230 1400 900 33,89 53,11
240 1400 700 36,90 73,80
240 1400 800 36,90 86,75
240 1400 900 36,97 57,83
Warning: if one of the thermostats is faulty, the entire heating unit must be replaced!
7.5 NTC probe
This sensor is fixed to the hot air fan screw. It comprises a resistor, inserted in a metal capsule, with a value
that decreases as the temperature increases.
The electronic circuit reads the value of the resistor (which depends on the temperature inside the tumble
dryer) and when it drops below a certain value, cuts the power supply to the heating unit. As the air cools,
the value of the resistor increases, and when it reaches a certain value the electronic circuit restores the
power supply to the heating unit. This occurs every time the temperature inside the appliance exceeds a
given value, which varies according to the drying cycle that has been selected.
1. Metal capsule
2. NTC
3. Terminals
RESISTANCE (Ω)
TEMPERATURE (ºC)
Rated value Maximum value Minimum value
20
60
80
6050
1250
640
6335
1278
620
5765
1222
660
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