Electric pre-heater
The electric oil pre-heater, is placed on the burner housing and is used for preheating the fuel oil. The pre-heater is provided with electric heating elements, which conduct the produced heat to the heavy fuel oil. Depending on the oil throughput and viscosity the burner can be equipped with one or more pre-heaters. Irrespective of the number of pre-heaters there is only one common temperature controller. However, each pre-heater is provided with its own limit thermostat.
Temperature limit thermostat
The temperature limit thermostat (6) has a fixed temperature limit of 180˚C and it is fitted with a reset button. If the oil temperature becomes too high, the temperature limit thermostat stops the burner. The shut down is indicated in the control system. In case of failure, the fault has to be repaired. Before the pre-heater can be taken into service again, the reset button on the temperature limit thermostat must be activated and the shut down in the control system must be reset.
Note: Reset must be carried out when the thermostat is not under voltage.
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 registered by a Pt 100 resistance temperature sensor and supplied to the control system.Fluctuations in oil temperature are minimized by the Pt 100 sensor which is placed directly on the heating plate.If the 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 temperature sensor with transmitter, which handles remote indication of the oil temperature
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 immediately. 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.
The electric oil pre-heater, is placed on the burner housing and is used for preheating the fuel oil. The pre-heater is provided with electric heating elements, which conduct the produced heat to the heavy fuel oil. Depending on the oil throughput and viscosity the burner can be equipped with one or more pre-heaters. Irrespective of the number of pre-heaters there is only one common temperature controller. However, each pre-heater is provided with its own limit thermostat.
Temperature limit thermostat
The temperature limit thermostat (6) has a fixed temperature limit of 180˚C and it is fitted with a reset button. If the oil temperature becomes too high, the temperature limit thermostat stops the burner. The shut down is indicated in the control system. In case of failure, the fault has to be repaired. Before the pre-heater can be taken into service again, the reset button on the temperature limit thermostat must be activated and the shut down in the control system must be reset.
Note: Reset must be carried out when the thermostat is not under voltage.
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 registered by a Pt 100 resistance temperature sensor and supplied to the control system.Fluctuations in oil temperature are minimized by the Pt 100 sensor which is placed directly on the heating plate.If the 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 temperature sensor with transmitter, which handles remote indication of the oil temperature
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 immediately. 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.
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