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4.10
Burner description
25
10
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
20159324
Technical description of the burner
26
11
7
6
12
20051363
D3830
12
16
15
14
13
18 Power switch for different operations:
automatic - manual - off
Button for: power increase - power reduction
19 Motor contact maker and thermal cut-out with reset button
(RS 35/M C05 three-phase)
20 Motor capacitor (RS 25/M C05 single-phase)
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 Guide extensions (long head version)
26 4-pole socket cover (see electrical panel appendix)
Two types of burner lockout may occur:
CONTROL BOX LOCKOUT:
if the control box button (red LED) 22)(Fig. 4) lights up, it
indicates that the burner is locked out. To reset, hold the push
button down for between 1 and 3 seconds.
MOTOR LOCKOUT (RS 35/M C05 three-phase):
Release by pressing the button on thermal relay 19)(Fig. 4).
GB
D3829
Fig. 4
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