11
20159575
GB
Technical description of the burner
4.10
Burner description
1
Combustion head
2
Ignition electrode
3
Screw for combustion head adjustment
4
Minimum air pressure switch
(differential operating type)
5
Flame sensor probe
6
Air pressure socket
7
Gas pressure test point and head fixing screw
8
Screws securing fan to sleeve
9
Slide bars for opening the burner and inspecting the
combustion head
10 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 flue
draught, which tends to draw air from the fan air inlet
11 Areas for passage of electric cables
12 Air inlet to fan
13 Gas input pipework
14 Gas butterfly valve
15 Boiler mounting flange
16 Flame stability disc
17 Flame inspection window
18 Power switch for: automatic - manual - off
Button for: power increase - power reduction
19 Suppressor
20 Relay
21 Control box with lockout pilot light and lockout reset button
22 Sockets for electrical connection
23 Two electric switches:
- one for “burner on - off”
- one for “1st - 2nd stage”
24 Plug-socket on ionisation probe cable
25 Ignition transformer
Two types of burner lockout may occur:
CONTROL BOX LOCKOUT:
if the control box button (
red LED
) 22)(Fig. 5) lights up, it
indicates that the burner is locked out. To reset, hold the push
button down for between 1 and 3 seconds.
Fig. 5
20152620
20160370
20160371
