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4.7
Burner description
1
Ignition electrodes
2
Combustion head
3
Screw for combustion head adjustment
4
Photocell for flame presence control
5
Screw for fixing fan to flange
6
Servomotor provides adjustment of fuel delivery regulator
and of air gate valve. When the burner is not operating the
air gate valve is fully closed in order to reduce heat disper-
sion from the boiler due to the flue draught which draws air
from the fan suction inlet.
7
Slide bars for opening the burner and inspecting the com-
bustion head
8
Pump delivery valve (safety valve)
9
Pump delivery valve
10 Valve on nozzle return
11 Oil pressure switch
12 Pump
13 Plate prearranged to drill 4 holes for the passage of hoses
and electrical cables.
14 Supplementary air gate valve
15 Non-drip nozzle holder
16 Fan pressure test point
17 Boiler mounting flange
18 Flame stability disk
19 Flame inspection window
20 Power switch for different operation: automatic - manual - off
Button for: power increase - power reduction
21 Motor contactor and thermal cut-out with reset button
(RL 38-50/M)
22 Motor capacitor (RL 28/M)
23 Control box with lock-out pilot light and lock-out reset button
24 Terminal strip
25 Air gate valve
26 Pump pressure adjustment
27 Pressure gauge for pressure on nozzle return
28 Pressure regulator on nozzle return
29 Extensions for slide bars 7)
Two types of burner failure may occur:
Control Box Lock-out:
if the control box 23)(Fig. 4) pushbutton lights up, it indicates that
the burner is in lock-out. To reset, press the pushbutton.
Motor trip (RL 38-50/M):
release by pressing the pushbutton on thermal relay 21)(Fig. 4).
4.8
Standard equipment
1 - Flange gasket
2 - Hoses
2 - Gaskets for flexible hoses
2 - Nipples for flexible hoses
1 - Thermal insulation screen
2 - Extensions 29)(Fig. 4) for slide bars 7)
(for models with 351 mm blast tube)
4 - Screws to secure the burner flange to the boiler M 8 x 25
3 - Fairleads for electrical connections (RL 28/M)
4 - Fairleads for electrical connections (RL 38-50/M)
1 - Instruction booklet
1 - Spare parts list
20033316
Technical description of the burner
12
GB
D850
In case of use with gas oil containing up to 10%
Bio blend, it will be essential to use flexible oil
lines suitable for bio fuel use.
WARNING
Please contact Riello for further information.
D851
D852
Fig. 4
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