Burner Components - Riello 20015640 Installation Manual

Technical description of the burner
3
3.9

Burner components

10 26
11
1 Combustion head
2 Ignition electrode
3 Screw for combustion head adjustment
4 Max. gas pressure switch
5 Servomotor controlling the gas butterfly valve and the air gate
valve (by means of a variable profile cam mechanism).
When the burner is stopped the air gate valve will be com-
pletely closed to reduce heat loss due to the flue draught,
which tends to draws air from the fan air inlet.
6 Plug-socket on ionisation proble cable
7 Pilot tube
8 Motor contactor and thermal cut-out with reset button
9 Power switch for different operations:
automatic - manual - off
Button for:
power increase - power reduction
10 Terminal strip for electrical connection
11 Fairleads for electrical connections by installer
12 Control box with lock-out pilot light and lock-out reset button
13 Flame inspection window
14 Minimum air pressure switch (differential operating type)
15 Slide bars for opening the burner and inspecting the combus-
tion head
20015724
12 14
19
20
27 9 8
13 15
7
21
22
4
6 5 3
16
17 18
16 Gas pressure test point and head fixing screw
17 Air pressure test point
18 Flame sensor probe
19 Air gate valve
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 mounting the power regulator RWF40
27 Main valve ON/OFF selector
Two types of burner failure may occur:
• CONTROL BOX LOCK-OUT:
if the control box 12) pushbutton lights up, it indicates that the
burner is in lock-out.
To reset, press the pushbutton.
• MOTOR TRIP:
two-phase electricity supply; release by pressing the pushbut-
ton on thermal cutout 8).
9
GB
23 25
24
2 1
D9733
Fig. 5