9
6461
GB
Technical description of the burner
3
3.9
Burner components
19
21
17
A
1
2
3
16
15
14
9
26
10
13
11
20
24
18
25
12
23
4
22
5
8
6
7
1 Combustion head
2 Ignition electrode
3 Screw for combustion head adjustment
4 Maximum gas pressure switch
5 Servomotor controlling the gas butter-
fly valve and the air damper valve (by
means of an adjustable profile cam
mechanism).
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.
6 Plug-socket on ionisation probe cable
7 Extensions for slide bars 15)
8 Motor contact maker and thermal relay
with reset button
9 Power switch for:
automatic - manual - off
Button for:
power increase - power reduction
10 Terminal board for electrical wiring
11 Cable grommets for electrical wiring
(to be carried out by the installer)
12 Control box with lockout pilot light and
lockout reset button
13 Flame inspection window
14 Air pressure switch
(differential operating type)
15 Slide bars for opening the burner and
inspecting the combustion head
16 Gas pressure test point and head fixing
screw
17 Air pressure socket
18 Flame sensor probe
19 Air damper
20 Fan air inlet
21 Screws to secure fan to pipe cou-
pling
22 Gas input pipe
23 Gas butterfly valve
24 Boiler fixing flange
25 Flame stability disc
26 Bracket for application of output power
regulator RWF40
Fig. 5
D8687
A
Seen from A
