Combustion Head Setting; Electrodes Adjustment - Riello RG4D Installation, Use And Maintenance Instructions

4.3 COMBUSTION HEAD SETTING

It depends on the output of the burner and is carried out by rotating clockwise or counterclockwise the set-
ting screw (6) until the set-point marked on the regulating rod (7) is level with the outside plane of the
nozzle-holder assembly (1).
In the sketch the combustion head is set for an output of 3.50 GPH at 15 bar.
The set-point 2.5 of the regulating rod is at the same level with the outside plane of the nozzle-holder as-
sembly as shown in the schedule.

4.4 ELECTRODES ADJUSTMENT (

ATTENTION
Lean the diffuser disc-holder as-
sembly (1) on the nozzle-holder
(2) and lock it by screw (3). For
prospective adjustments loosen
screw (4) and move the elec-
trodes assembly (5).
To have access to the electrodes
carry out operation as described in
chapter 4.2 (page 6) "RECOM-
MENDED NOZZLES".
4.5 PUMP PRESSURE AND AIR OUTPUT
st
1 STAGE ADJUSTMENT
ADJUSTMENT OF AIR SHUTTER:
Unloosen the nut (1), turn the screw (2) until the indicator (3) reaches the
position desired. Then lock the nut (1), (see fig. 14).
PRESSURE REGULATION:
This is set at 9 bar at the factory.
Should it be necessary to re-set or alter such pressure, this can be done, by
adjusting screw (7).
The pressure gauge must be mounted in place of cap (8), (see fig. 15).
nd
2
STAGE ADJUSTMENT
ADJUSTMENT OF AIR SHUTTER:
Unloosen the nut (4), turn the screw (5) until the
indicator (3) reaches the position desired.
Then lock the nut (4), (see fig. 14).
PRESSURE REGULATION:
This is set at 14 bar at the factory.
Should it be necessary to re-set or alter such pres-
sure, this can be done, by adjusting screw (9).
The pressure gauge must be mounted in place of
cap (8), (see fig. 15).
When burner shuts down the air damper automati-
cally closes till a max. chimney depressure of
0,5 mbar.
(see fig. 12, page 6)
see fig. 13)
0
4.5
– 0.5 mm
Fig. 13
D5341
Fig. 15
7 GB
WARNING
MEASURES MUST BE
RESPECTED
4
5
3 2 1
Fig. 14
6 – 7
mm
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