Burner Adjustment; Combustion Head - Riello RX 70 S/PV Installation, Use And Maintenance Instructions

4.3

BURNER ADJUSTMENT

To achieve optimal burner adjustment, the flue gases produced by combustion must be analysed as they leave
the bouiler. In conformity with Efficiency Directive 92/42/EEC, the burner must be applied to the boiler, adjusted
and tested in compliance with the instruction manual of the generator in question, including checking of CO and
CO concentration in flue gases and their temperature
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Check in this order:
- maximum output power;
The maximum output power should coincide with that required by the boiler used. To increase or decrease its
value, adjust trimmer MAX on the control box (fig. 5).
Measure the gas delivery on the contactor to precisely establish the burnt output.
Using a smoke analyser measure to the value of the CO
The correct values are: CO
To correct these values act on thee gas valve in the following way:
- To increase the gas delivery and the CO
- To reduce the gas delivery and the CO
The minimum output power should coincide with that required by the boiler used. To increase or decrease its
value, adjust trimmer MIN on the control box (fig. 5).
Measure the gas delivery on the contactor to precisely establish the burnt output.
Using a smoke analyser, measure the value of the CO
The correct values are: CO
To correct these values act on the gas valve in the following way:
- To increase the gas delivery and the CO
- To reduce the gas delivery and the CO
To increase or decrease its value, adjust trimmer START on the control box (fig. 5).
NOTE: The START adjustment range goes from notch 0 to notch 5 (4,500 rpm), if the latter is
exceeded, the burner does not start.

4.4 COMBUSTION HEAD

The combustion head comprises a highly heat resistant cylin-
der whose surface features numerous holes, encased in a
metal "mesh".
The air-gas mixture is pushed inside the cylinder and out of
the head through the holes in the perimeter. Combustion
starts when the air-gas mixture is ignited by a spark generat-
ed by the electrode.
The metal "mesh" is the combustion head's most essential element since it improves burner performance
considerably.
The flame developed on the surface of the head is perfectly retained and adheres to the mesh when oper-
ating at the maximum setting. This allows modulating ratios as high as 6:1, avoiding the danger of flashback
when modulating is at its minimum.
The flame features an extremely compact geometry, meaning that there is no risk of contact between the
flame and parts of the boiler, consequently eliminating the possible problem of poor combustion.
The flame's structure means that smaller combustion chambers can be developed, designed to exploit this
particular feature.
3350
- minimum output power;
8,5-9% or O 5-5.5%.
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: turn the V1 screw anticlockwise (unscrew).
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: turn the V1 screw clockwise (tighten).
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8,5-9% or O 5-5.5%.
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: turn the screw V2 in an clockwise direction (tighten).
2
: turn the screw V2 in a anticlockwise direction (unscrew).
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- start-up output power.
or the O in order to optimise the burner calibration.
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or the O in order to optimise the burner calibration.
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10 GB