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AALBORG
INDUSTRIES
21-18/60
ELECTRIC
PRE~HEA+ER
OM5560_88#A.2
1.2 Temperature controller for pre-heater
The desired fuel oil temperature can be set in the control system together with alarm
set points and shut down set points. The fuel oil temperature in the pre-heater is reg-
istered by a Pt 100 resistance temperature sensor and supplied to the control sys-
tem.Fluctuations in oil temperature are minimized by the Pt 100 sensor which is placed
directly on the heating plate.lfthe oil temperature becomes too low or too high during
operation, e.g.
if
the heater elements are faulty, the control system stops the burner and
actuates a shut down indication.
Furthermore, the pre-heater is equipped with an additional
Pt 100 resistance temper-
ature sensor with transmitter, which handles remote indication
of
the oil temperature.
1.3 Test of the functions
The function
of
the temperature limit thermostat can be tested by dismantling one
of
the wires at the terminals to the temperature limit thermostat. The burner stops imme-
diately.
The low oil temperature shut down can be tested by disconnecting the electric power
to the pre-heater. When the oil temperature drops below the shut down limit the burner
stops.
Language
UK
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