11
20040559
GB
Technical description of the burner
4.11
Burner description
1
Combustion head
2
Ignition electrode
3
Screw for combustion head adjustment
4
Pipe coupling
5
Minimum air pressure switch (differential type)
6
Flame sensor probe
7
Air pressure socket
8
Gas pressure test point and head fixing screw
9
Screw securing fan to pipe coupling
10 Slide bars for opening the burner and inspecting the com-
bustion head
11 Servomotor controlling the gas butterfly valve and the air
damper valve (by means of an adjustable profile cam mech-
anism).
When the burner is not operating the air gate valve is fully
closed in order to reduce heat dispersion from the boiler due
to the flue draught which draws air from the fan suction inlet.
12 Plate with four hole knock-outs for electrical cable routing
13 Fan air inlet
14 Gas input pipe
15 Gas butterfly valve
16 Boiler fixing flange
17 Flame stability disc
18 Flame inspection window
19 Control box with lockout pilot light and lockout reset button
20 Power switch for:
automatic - manual - off
Button for: power increase - power reduction
21 Plugs for electrical wiring
22 Air damper
23 Plug-socket on ionisation probe cable
24 Maximum gas pressure switch
25 Motor contact maker and thermal relay with reset button
26 Motor protection
NOTE
Two types of burner lockout may occur:
Control box lockout:
if the control box 19)(Fig. 5) push-button lights up, it indi-
cates that the burner is in lockout.
To reset, press the button.
Motor lockout:
three-phase electrical supply; to unblock, press the thermal
relay switch 25)(Fig. 5).
4.12
Burner equipment
Flange for gas train . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Gasket for flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Flange fixing screws, M 10 x 35 . . . . . . . . . . . . . . . . . . . . No. 4
Thermal insulation screen . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Screws to secure the burner flange to the boiler: . . . . . . . . No. 4
M 12 x 35
Cable grommets for the electrical wiring . . . . . . . . . . . . . . No. 5
Motor protection (with fixing screw) . . . . . . . . . . . . . . . . . . No. 1
Set of plugs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Technical instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Spare parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Fig. 5
D11484
D11481
D3983
