20039735
10
GB
4.4 SETTING OF DIFFUSER DISC / ELECTRODES
(see fig. 12)
4.5 PUMP PRESSURE
The pump leaves the factory set at 12 bar.
To change it act on pump pressure adjust screw (4, fig. 5, page 5).
4.6 COMBUSTION HEAD SETTING
(see fig. 11, page 9)
Combustion head adjustment varies depending on burner delivery.
It depends on the output of the burner and is carried out by rotating clockwise or counterclockwise the
setting screw (5) until the set-point marked on the regulating rod (9) is level with the outside plane of the
nozzle-holder assembly (1).
Figure 11 illustrates the head adjusted for a delivery of 0.75 GPH at 12 bar.
The set-point
3
of the regulating rod (9) is at the same level with the outside plane of the nozzle-holder
assembly (1) as shown in the table at page 8.
4.7 AIR DAMPER ADJUSTMENT
(see fig. 11, page 9)
To adjust air damper, proceed as follows:
Loosen nut (8) and adjust damper setting with the aid of the screw (7).
When burner shuts down the air damper automatically closes till a max. chimney depressure of 0.5 mbar.
Once you have finished adjusting, screw nut (8) back on.
4.8 BURNER START-UP CYCLE
Lock out is indicated by a lamp on the control box (3, fig. 1, page 1).
Loosen screw (3) to set the dif-
fuser disc-holder assembly (1)
and loosen screw (4) to set the
electrodes assembly (2).
ATTENTION
To have access to the electrodes
carry out operation as described in
chapter “4.2
RECOMMENDED
NOZZLES”
(page 8).
WARNING
DISTANCES
MUST BE RESPECTED
D5028
2
4
3
1
4.5
– 0.5 mm
0
2.5
±
0.2 mm
3
+ 0.5 mm
0
Fig. 12
Lock-out due to failure to light
C
Normal
D5029
~
12s
Thermostat
Motor
Ignition transformer
Valve
Flame
Lock-out lamp
~
12s
5 s
C
