Riello G20S Instrucciones De Instalación, Montaje Y Funcionamiento página 39

PUMP-PRESSURE AND AIR-FLOW
The burner, in order to guarantee good smooth starts, irrespective of the type of boiler, is fitted with a
hydraulic device which, independently of the control-box, reduces the fuel- and air-flow.
At ignition, the pressure at the nozzle is 9 bar. After 4 - 6 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.
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SETTING FOR THE LOW IGNITION-FLAME
Air-damper adjustment
Loosen the screw (1), by approximately one full turn; in this way, the burner remains permanently
on low flame.
Loosen the nut (2), turn the screw (3), in order to set the air-damper (4) in the position required.
Then, lock the nut (2) and tighten the screw (1).
Reducer-adjustment
The pressure-reducer is factory set, at 9 bar.
The pressure-gauge should be mounted, in place of plug (6).
Should it be necessary to re-set or alter such pressure, this can be done, by adjusting screw (5)
(always, after having loosened screw 1 ).
HIGH-FLAME SETTING
Air-damper adjustment
Loosen the nut (7), turn the screw (8), until the air-damper (4) is in the required position.
Then, lock the nut (7).
Pump-adjustment
The pump-pressure is pre-set, during production, at 12 bar.
Should it become necessary to re-set or alter such pressure, this can be done by turning screw (9).
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