Riello RG4F Installation, Use And Maintenance Instructions page 47

When refitting the nozzle-holder assem-
bly (1, Fig. 13, on page 8), screw on nut
(3) without tightening it all the way
ATTENTION
with a driving torque of 15 Nm, as illu-
strated in Fig. 14.
4.3 ELECTRODES ADJUSTMENT
THE GIVEN DISTANCES MUST BE RE-
SPECTED.
ATTENTION
To adjust, proceed as follows:
Lean the diffuser disc-holder assembly (1) on the

nozzle-holder (2) and lock it by screw (3).
For prospective adjustments loosen screw (4) and

move the electrodes assembly (5).
To have access to the electrodes carry out operation
as described in chapter "4.2 RECOMMENDED NOZ-
ZLES" page 8.
4.4 PUMP PRESSURE
The pump leaves the factory set at 12 bar.
Make required adjustments with the aid of the screw
(Fig. 8, on page 5).
4.5 COMBUSTION HEAD ADJUSTMENT
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 3.50 GPH at 12 bar.
The set-point 2.5 of the regulating rod (9) is at the
same level with the outside plane of the nozzle-
holder assembly (1) as shown in Tab. D, on page 8.
4.6 AIR DAMPER ADJUSTMENT
To adjust air damper, proceed as follows: (Fig. 13,

on page 8):
Loosen nut (8) and adjust damper setting with the

aid of the screw (7).
When burner shuts down the air damper automati-

cally closes till a max. chimney depressure of 0.5
mbar.
Once you have finished adjusting, screw nut (8)

back on.
4,5
9 GB
D5684
0
– 0,5 mm 6 7
4
5
3 2 1
Fig. 14
D5085
mm
Fig. 15
2903004