4
BURNER DESCRIPTION (A)
1 Fan
2 Fan motor
3 Air gate valve servomotor
4 Combustion head
5 Ignition electrodes
6 Flame stability disk
7 Panel board - cover
8 Air inlet to fan
9 Manifold
10 Thermal insulation screen for securing
burner to boiler
11 Shutter
12 Air pressure test point
13 Pump
14 Photoelectric cell
15 Pump motor
16 Valve group
17 Screw for combustion head adjustment
DESCRIPTION OF PANEL BOARD (B)
1 Air pressure switch
2 Voltage free contacts relay
3 Control box
4 Two switches:
- one “burner off - on”
- one for “1st - 2nd stage operation”
5 Main supply terminal strip
6 Motor contactor and thermal cut-out with
reset button
7 Pump motor relay
8 Ignition transformer
9 Connector for Status
10 Entry for power cables and external leads
N.B.
Two types of burner failure may occur:
Control box lock-out:
if the control box 3)(B)
pushbutton (
red led
) lights up, it indicates that
the burner is in lock-out.
To reset, hold the pushbutton down for between
1 and 3 seconds.
Motors trip
: release by pressing the push but-
ton of the thermal cutout relay.
(A)
(B)
D3940
D3941
3
4
5
6
7
8
11
12
14
15
17
2
13
16
1
9
10
6
10
4
3
2
7
1
8
9
5