Activation, Calibration And Functioning; Adjustment Of The Pressure Stabiliser; Valve Adjustment; Delivery Optimisation - Riello MB 407/1 Instrucciones De Instalación, Uso Y Mantenimiento

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-
WARNING tions of the laws in force.
5.2

Adjustment of the pressure stabiliser

Calibrate the pressure adjuster by rotating the adjustment screw
using a screwdriver: by rotating clockwise there is an increase in
output pressure, by rotating anticlockwise there is a decrease in
pressure.
When the nominal desired pressure value has been reached,
close the cover and seal the extremities of the wire leaving the
passing ring short.
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.
5.3

Valve adjustment

The slow ignition delivery (valve opening phase) should be ad-
justed, after having unscrewed the cover 5) (Fig. 1, page 4), by
rotating the screw below in the correct direction +/-; the cover it-
self 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 delivery may be adjusted by rotating the ring nut
6) in the appropriate direction + / – after having loosened the un-
sealed screw 7).
5.4

Delivery optimisation

Optimal Multibloc functionality is achieved by first using the open-
ing of the valve and then adjusting the stabiliser to achieve the re-
quired delivery. If this is not obtained, repeat the operation
described above.
5.5 Low gas pressure switch adjustment
Please refer to the burner manual.
5.6 VPS 504 Valve leak detection control device (if present)
The valve leak detection control device 9)(Fig. 1, page 4) is ob-
ligatory for the supply trains of burners with a maximum output
greater than 1200 kW.
This valve leak detection control device operates by creating be-
tween the two valves an overpressure of about 20 mbar com-
pared to the pressure upstream; the testing time depends on the
volume to be pressurised as well as the pressure upstream and
varies from 10 to 26 seconds.
The yellow pilot lamp lighting up confirms the positive outcome of
the test, while a negative outcome, with the resulting lock-out, is
signalled by the red pilot light; lock-out continues until the valve
leak detection control device is live.
20049141
Activation, calibration and functioning
10
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
using a dedicated kit.
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.
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.
An operation check can be carried out by slackening the screw of
the pressure test point p
a
valve leak detection control device must lock out.
The fuse can be reached by using a screw-driver to remove the
cap near the electrical connection socket; a reserve fuse is in the
upper part of the valve leak detection control device under the
plug.
it is possible to install the valve leak detection con-
trol device on trains that do not have it, by request-
ing the kit.
WARNING
GB
of the equipment before the check; the