Riello CB 512/1 Manuel D'entretien page 47

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 7)(Fig. 9) and rotate 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
detection control device if this is present, may vary between 10
and 30 mbar; should another pressure field be necessary, re-
place the normal blue spring (by unscrewing the cover 8)(Fig. 9)
with another (for example red 25 ÷ 55 mbar, black 60 ÷ 110 mbar,
etc.).
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5.3 Valve adjustment
The ignition delivery (rapid valve opening phase) should be ad-
justed, after having unscrewed the cover 9) (Fig. 9), by rotating
the spindle below in the correct direction +/-; the cover itself may
be used as a tool by turning it upside down.
The steady state output is progressively reached starting from
the ignition delivery following the action of the hydraulic brake;
the steady state output may be adjusted by rotating the screw
which is protected by the cover 12) in the appropriate direction +/
- (Fig. 9).
5.4 Minimum gas pressure switch calibration
Please refer to the burner manual.
Activation, calibration and functioning
6)(Fig. 9) of the valve leak
e
8
9
Check the correct working of the adjustment, com-
mand and safety devices.
WARNING
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 pressure
switch with manual reset must be fitted to the burner, electrically
connected in the thermostatic range and correctly calibrated.
7 2 12 9
18
6
5
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.
GB
Fig. 9
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