3 Description of assemblies and components Thermo E 200 / 320
304
3.1.5 Electronic ignition unit with ignition
electrodes
The electronic ignition unit induces the high voltage
required for ignition of the fuel-air mixture. Ignition is trig-
gered by a high voltage spark, which is initiated on the
ignition electrode.
3.1.6 Temperature sensors with water
temperature sensor and integrated
overheating protection
The water temperature sensor captures the coolant
temperature at the heat exchanger outlet as electrical
resistance.
This signal is transmitted to the control unit, where it is
processed.
The overheating protection integrated into the tempera-
ture sensor is responsible for temperature limitation.
Similar to the water temperature sensor, the coolant
temperature is captured at the heat exchanger outlet as
electrical resistance and transmitted to the control unit.
Overheating protection prevents inadmissibly high heater
operating temperatures.
At a temperature greater than 125°C heater deactivation
and interlocking is initiated.
It is not necessary to manually reset the overheating
protection.
3.2 Heat exchanger
The heat exchanger transfers the heat generated by
combustion to the coolant circulation system.
Flame detector
Window
Electronic ignition unit
Disc
Electronic ignition unit
Ignition electrode
Temperature
sensor
Coolant inlet
Coolant outlet
Exhaust outlet
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