Thermo E 200 / 320 3 Description of assemblies and components
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3.1.3 Nozzle block preheater
In case of very low temperatures fuel may exhibit severely
modified viscosity. Due to insufficient fuel atomization
functional heater malfunctions may occur.
Depending on the fuel used, these temperatures vary.
When used in cold regions or if fuels different from diesel
fuel are used, we recommend the use of a nozzle block
preheater.
The nozzle block preheater consists of a heating element
with an integrated temperature sensor.
At a temperature of < 5°C the heating element heats the
nozzle holder and thus, fuel and atomizer nozzle. Fuel
viscosity is reduced and atomization improved.
The heating duration depends on the intake air tempera-
ture and on the reflected by the burner heat.
Above 8°C the thermostat turns the preheater off.
The use of the nozzle block preheater is optional. It is
possible to retrofit this capability without modifications to
the control unit.
3.1.4 Control unit
The control unit 1587 ensures the operating sequence
and burner operation monitoring.
The flame detector is integrated into the control unit.
3.1.4.1 Flame detector
The flame detector monitors the flame conditions during
heater operation.
The fame detector is a photo transistor, which changes its
resistance as a function of flame luminous intensity and
thus, the voltage applied.
Nozzle block preheater
Thermostat
Heating element
Control unit 1587
Flame detector
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