11
After such a shutdown, the overheat safety
shut off must be replaced and the sauna
unit or the control unit monitored by an ex-
pert.
Note to the electrical technician: You can
easily check the function of the overheat
safety shutoff by shorting the two contacts
for the shut off line on the control unit or
checking to see whether 0 V is indicated
on the proper plug. At a high-ohm
temperature check, this is defective and
you will measure the control voltage.
4.3 Checking the temperature sensor
The control unit determines the temperature
with a KTY temperature sensor. These have
a positive temperature coefficient; that is,
the resistance of these components rises
as a function of the temperature.
An important value is the resistance at nor-
mal room temperature. At 20°C, this is
about 1,9 k
!"
To determine the temperature on the
temperature sensor, you can measure the
low voltage on the sensor plug with a
voltmeter (measuring range 20 V DC) and
calculate the temperature value using the
diagrams (Illust. 17).
Illust. 17
5
. Heating time extension
The control unit is adjusted for a maximum
heating time of 6 hours at delivery. This
heating time limit can be extended to 12
hours.
To do so, it is necessary to remove a
resistor underneath the dial on the control
board.
To get the correct position of the resistor,
please look at Illust. 18. To accomplish
this, it is absolutely necessary to switch off
the fuses or the main switch.
Caution: As a matter of principle, this
work may only be undertaken by a
professional!
Remove this resistor for a
heating time of 12 h
ä
Illust. 18
2,5
2
1,75
2,25
english
