Key
Automatic control unit
1
3A fuse
2
3
Main switch
4
Lock-out warning light
5
Burner motor
Mains connection plug and auxiliary devices
6
Photo-resistor
7
8
Room thermostat
ADJUSTMENTS
AIR ADJUSTMENT
The easily accessible micrometric screw device (13)
allows fine, stable, precise adjustment of delivery
air. After loosening the crown (12) turn the screw
clockwise to reduce throttle valve aperture: turn
anticlockwise to increase it.
NOZZLE HOLDER ADJUSTMENT
The special shape of the draught tube and the
diffuser, the position of which is adjustable even
when the burner is working, allows optimisation of
combustion parameters right across the burner flow-
rate range and even in critical working conditions.
Turn the screw (17) anticlockwise to bring the nozzle
holder forward and increase airflow around the
diffuser. Vice versa, turning the screw anticlockwise
reduces the amount of air passing through.
Boiler thermostat
9
10 Ignition transformer
11 1
st
stage solenoid valve
12 2
stage solenoid valve
nd
13 Air aperture servomotor
17 Self-adjusting thermostat
15 Auxiliary terminal block
16 Filter
34
Fig. 7
Fig. 8