30
FA ROTEX A1 BOe - 02/2014
7
x
Oil burner
7 Oil burner
7.1 Design and brief description
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 con-
struction 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. To do this the
boiler controller first switches the nozzle rod heating on. 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 - 3 minutes.
Sequence of firing programme
The firing programme is monitored by the automatic firing unit. It
proceeds with the following steps:
– Oil preheating.
– Electric motor starts up, preliminary ventilation.
– Ignition switches on.
– Solenoid valve opens.
– Flame formation
– Ignition switches off.
– Burner runs, as long as there is demand for burner by the con-
trol and the flame monitor enables the burning process.
– When the burner request by the Control ends: Solenoid valve
closes, oil preheating switches off.
– Post-ventilation
– Electric motor switches off.
1
Automatic oil firing unit
2
Oil pump
3
Heating oil suction line
4
Heating oil return line
5
Scale air throttle
6
Adjusting screw for air throttle
7
Fan rigid in compression
8
Air supply connector
9
Blower pressure measure-
ment spigot
10
Electric motor
11
Solenoid valves
12
Ignition transformer with
flame monitor
13
Burner flange with seal
14
Service screw
15
Service Allen key
16
Holder for service position
17
Setting gauge
1)
18
Scale of recirculation opening
19
Flame tube
20
Recirculation tube
21
Nozzle connection cover
1)
Almost any setting and main-
tenance work can be carried
out on the burner using the
tools provided.
Fig. 7-1
Oil burner plan view (front view)
Fig. 7-2
Oil burner - side view from the left
for legend see fig. 7-1
Fig. 7-3
Oil burner - side view from the right
for legend see fig. 7-1
