Riello CB 512/2 Manuel D'entretien page 53

5 Activation, calibration and functioning
5.1 Notes on safety for the first start-up
The first start-up of the burner must be carried out
by qualified personnel, as indicated in this manual
and in compliance with the standards and regula-
tions of the laws in force.
WARNING
5.2 Adjustment of the pressure stabiliser
Unscrew the protective device 1)(Fig. 7 - Fig. 9, page 11) and ro-
tate the spindle below: output pressure is increased by screwing,
and viceversa by unscrewing.
The greater the loss of pressure p between the inlet and the out-
let of the pressure stabiliser, the more effective its action; its func-
tionality increases with the increase in downstream pressure, as
an increment of obtainable pressure, compatible with the other
operational needs and with the network pressure availability, lim-
iting the opening of the upstream valve.
The output pressure of the stabiliser at the minimum gas pres-
sure switch socket or at the socket p
control device if this is present, may vary between 10 and 30
mbar; should another pressure field be necessary, replace the
normal blue spring (by unscrewing the cover 2)(Fig. 7 - Fig. 9,
5.3 Valve adjustment
The safety valve 8)(Fig. 7 - Fig. 9, page 11) (rapid opening) must
work at its maximum opening capacity: check, once the protec-
tive device 3) has been removed, that the adjustment valve is
completely unscrewed.
CB 512-520/2
With regard to the two-stage adjustment valve 9)(Fig. 7)
(equipped with hydraulic brake) the ignition output (valve rapid
opening phase) is to be adjusted, after having unscrewed the
cover 4), by rotating the spindle below in the appropriate direction
+/-; the cover itself may be used as a tool by turning it upside
down.
S8573
Activation, calibration and functioning
of the valve leak detection
e
2 1
10
Check the correct working of the adjustment, com-
mand and safety devices.
WARNING
page 11) with another (for example red 25 ÷ 55 mbar, black 60 ÷
110 mbar, etc.).
5.2.1 Pressure couplings
Should the train be connected to power supply lines in which gas
may have a variable pressure coupling in accordance with the
calorific power of the gas, the stabiliser will need to be removed;
the stabiliser must be put in a non-operating condition by com-
pletely screwing the adjustment spindle.
In any case, where not already present, a maximum gas pres-
sure switch with manual reset must be fitted to the burner, elec-
trically connected in the thermostatic range and correctly
calibrated.
 The first stage output is progressively reached starting
from the ignition output following the action of the hydraulic
brake; the first stage output may be adjusted by rotating the
ring nut 5) in the appropriate direction +/- after having loos-
ened the unsealed screw 6).
 The second stage output is adjusted by rotating the ring
nut 7) in the appropriate direction +/- ensuring that the
unsealed screw 6) remains loose, this is then tightened
when the calibration operation is complete.
It is nonetheless preferable to calibrate this output by using the
upstream pressure of the stabiliser; the considerations made in
relation to the functionality of the pressure stabiliser already stat-
ed remain valid, optimal functioning of the valves is obtained
when they are fully opened: it is therefore necessary to seek the
best compromise between the requirements of the stabiliser and
of the valves.
3 5
8
GB
4
6
7
9
Fig. 7
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