Combustion Head Setting; Electrodes Adjustment; Pump Pressure And Air Output; Pump-Adjustment - Riello Burners RG4S Manuel D'entretien

4.3 COMBUSTION HEAD SETTING,

It depends on the output of the burner and is carried out by rotating clockwise or counterclockwise the setting
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 12 bar. The set-point 2.5 of the regulating
rod (7) is at the same level with the outside plane of the nozzle-holder assembly (1) as shown in the schedule.
4.4 ELECTRODES ADJUSTMENTS,
ATTENTION
Lean the diffuser disc-holder
assembly (1) on the nozzle-holder
(2) and lock it by screw (3).
F o r p r o s p e c t i v e a d j u s t m e n t s
loosen screw (4) and move the
electrodes 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

The burner, in order to guarantee good smooth starts, irrespective of the type of boiler, is fitted with a hydrau-
lic device which, independently of the control-box, reduces the fuel- and air-flow.
At ignition, the pressure at the nozzle is 9 bar. After 3 - 9 seconds, it automatically increases to 12 bar.
The air-flow, initially adjusted to the low setting, is, at the change-over of pressure, automatically brought to
the air-flow required for the big flame.
SETTING FOR THE LOW IGNITION-FLAME , (see fig. 14)
ADJUSTMENT OF AIR SHUTTER
Unloosen the screw (8), by approximately one full turn; in this way, the burner
remains permanently on low flame. Unloosen the nut (5), turn the screw (4)
until the indicator (6) reaches the position desired.
Then lock the nut (5) and tighten the screw (8).
ADJUSTMENT START DELAYING DEVICE
This is set at 9 bar at the factory.
The pressure gauge must be mounted in place of plug
(4, fig. 8, page 4).
Should it be necessary to re-set or alter such pressure,
this can be done, by adjusting screw (7), always after
having loosened screw (8).
HIGH-FLAME SETTING, (see fig. 14)
AIR-DAMPER ADJUSTMENT
Loosen the nut (3), turn the screw (1), until the indica-
tor (2) is in the required position. Then, lock the nut (3).

PUMP-ADJUSTMENT

This is set at 12 bar at the factory.
The pressure gauge must be mounted in place of plug (4, fig. 8, page 4).
Should it be necessary to re-set or alter such pressure, this can be done, by adjusting screw (5, fig. 8, page 4).
When burner shuts down the air damper automatically closes till a max. chimney depressure of 0.5 mbar.
2333
(see fig. 12, page 6)
(see fig. 13)
WARNING
4.5
Fig. 13
7 GB
MEASURES MUST BE
RESPECTED
0
6
– 0.5 mm
4
5
3 2 1
Fig. 14
S7161
–
7
mm
D5085