Riello RX 90 S/PV Installation, Use And Maintenance Instructions page 25

4.3 BURNER ADJUSTMENT
To achieve optimal burner adjustment, the flue gases produced by combustion must be analysed as they
leave the generator. In conformity with Efficiency Directive 92/42/EEC, the burner must be applied to the
generator, adjusted and tested in compliance with the instruction manual of the generator in question, in-
cluding checking of CO and CO
Check in this order:
- maximum output ;
The maximum output power should coincide with that requested by the generator 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 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
The minimum output power should coincide with that requested by the generator used. To increase or de-
crease 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 CO2 or the O
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 start-up output can be varied by means of the START trimmer located on the equipment
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 generated 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 operating 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 generator, 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.
IONIZATION CURRENT
The minimum current necessary for the control
box operation is 5 ±A.
The burner gives a much higher current, mean-
ing that checking is not usually required.
Should you want to measure the ionization cur-
rent anyway, you must open the connector
( CN1 ) (see wiring diagram page 6) inserted in
the red wire and insert a microammeter.
3342
concentration in flue gases and their temperature.
2
- minimum output ;
8,5-9% or O 5-5.5%.
2 2
: turn the V2 screw clockwise (tighten)
2
: turn the V2 screw anticlockwise (loosen)
2
8.5-9% or O 5-5.5%.
2 2
: turn the screw V2 in an anticlockwise direction (unscrew)
2
: turn the screw V2 in a clockwise direction (screw up)
2
- start-up output .
or the O in order to optimise the burner calibration.
2 2
in order to optimise the burner calibration.
2
8
GB
.
Connectors
Probe
D7256