6 x Oil burner
40
FA ROTEX A1 BO - 10/2007
The blue burner installed as standard is similar in design and function to EN 267. The burner is engaged on the burner flange with
a bayonet lock and secured with a service screw. The construction of the burner head with internal flue gas recirculation makes
high efficiency, low nitrogen oxide combustion possible. The recirculation tube is firmly mounted in the burner flange.
Preheating oil
The heating oil is preheated during the start phase. For this purpose, the boiler control first switches on the nozzle bar heating
(the orange light on the automatic oil firing unit lights up). As soon as the oil preheating temperature is reached, the thermostat
of the nozzle bar heating triggers the programme sequence. The heating time with a cold start is 2 to 3 minutes.
Sequence of firing programme
The firing programme is monitored by the automatic firing unit. It proceeds with the following steps:
– Oil preheating.
– Electrical motor starts, ignition switches on.
– Pre-ventilation.
– Solenoid valve opens.
– Flame formation (green LED lights up).
– Ignition switches off.
– Burner runs, as long as there is demand for burner by the Control and the flame monitor enables the burning process.
– When the burner request by the Control ends: oil preheating and electrical motor switch off, solenoid valve closes.
– Post-ventilation corresponding to the control setting.
Automatic firing unit DKO 974
The automatic oil firing unit DKO 974 controlled by a microprocessor controls and monitors the firing programme. It features the
following properties:
– Stable programme times, independent of the fluctuations in the mains voltage or ambient temperature.
– Operating safety, even in the event of power failures. The automatic firing unit switches off in the event of a power failure
without a fault signal and on again once the normal voltage has been resumed.
An LED in the reset button of the automatic firing unit indicates the burner control processes. In normal mode, the LED sends
a brief flashing signal, followed by a long pause. In the event of malfunction, a flashing code provides information on the cause
of the fault (see chapter 9 "Faults and malfunctions").
6.2 Safety function
Fault shutdown and malfunction indicator
A fault shutdown takes place:
– if a flame signal is present during pre-ventilation (remote light monitoring),
– if no flame is formed on start (fuel release) after 5 seconds (safety period),
– if there is a flame failure during operation after unsuccessful programme repetition and no flame is formed.
A fault is displayed:
– by the burner malfunction indicator lighting up on the boiler control panel (fig 5-1, pos. 2),
– by the LED in the reset button of the automatic firing unit (fig 6-1, pos. 9) being continuously lit up,
– by "E" and a two digit fault code on the boiler control panel display.
Unlocking burner
• By briefly pressing the Manual button on the boiler control panel (fig 5-1, pos. 13).
• By briefly pressing the Reset button on the boiler control panel (fig 5-2, pos. 29).
• If there are several successive fault shutdowns, check the heating system (e.g. flue system, fuel supply).
6.3 Burner setting
q
q
a
CAUTION!
An inappropriate setting of the oil burner can lead to a prohibited level of pollutant emissions, heavy contam-
ination and increased oil consumption.
• Burner setting should be carried out only by authorised and recognised heating engineers.
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