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3.8
Burner description
20161001
9
26
7
10
11
1
Combustion head
2
Ignition electrode
3
Screw for combustion head adjustment
4
High gas pressure switch
5
Servomotor controlling the gas butterfly valve and the air
damper (by means of a variable profile cam mechanism).
When the burner is stopped the air damper will be completely
closed to reduce heat loss due to the draft of the chimney that
draws the air from the air intake of the fan
6
Plug-socket on the cable of the ionisation probe
7
Lifting rings
8
Motor contactor and thermal relay with reset button
9
Switch for:
- Automatic-manual-OFF operation
- Power increase / power reduction button
10 Terminal board for electrical connection
11 Cable grommets for electrical connection to be carried out by
the installer
12 Control box with light signalling lockout and reset button
13 Flame inspection window
14 Low air pressure switch
(differential operating type)
15 Slide bars for opening the burner and inspecting the combus-
tion head
20160778
Technical description of the burner
19
20
8
13
12
14
28
21
22
4
5
27
3
17
15
29
16
16 Gas pressure test point and head fixing screw
17 Combustion head air pressure test point
18 Flame sensor
19 Air damper
20 Air inlet to fan
21 Screws securing fan to sleeve
22 Gas input pipework
23 Gas butterfly valve
24 Boiler mounting flange
25 Flame stability disk
26 Bracket for output power regulator RWF (foreseen as kit)
27 Ignition transformer
28 Connection for ignition gas pilot
29 Lifting ring
Two types of burner failure may occur:
Flame safeguard lock-out
If the flame safeguard alarm lights up, it indicates that the
burner is in lock-out. To reset, press the reset push-button.
Motor trip
release by pressing the push-button on thermal overload
8)(Fig. 4). Refer to paragraph "Thermal relay calibration" on
page 24.
12
GB
25
6
24
23
2
1
18
Fig. 4
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