Pressure Loss - Riello CB 512/1 Installation, Use And Maintenance Instructions / Spare Parts List

5.5 VPS 504 Valve leak detection control device (if present)
The valve leak detection control device is obligatory for the sup-
ply trains of burners with a maximum output greater than
1200 kW. This valve leak detection control device operates by
creating between the two valves an overpressure of about 20
mbar compared to the pressure upstream; the testing time de-
pends 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 neg-
ative 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.
5.6

Pressure loss

The gas train pressure loss p is provided from the diagram (Fig.
10); the scales of the volumetric output
for:
a air
n natural gas (G20)
p propane (G30)
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Activation, calibration and functioning
V °
are valid respectively
°
3
V [Sm /h]
10
An operation check can be carried out by slackening the screw of
the pressure test point p
a
check; the 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 (18) (Fig. 9).
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
c town gas (G140), only for applications not covered by the
Gas Appliances Directive (2009/142/EC).
The values, provided from the diagram, can be different accord-
ing to the pressure regulator calibration.
The minimum necessary pressure in the network can be obtained
(+15 °C, 1013 mbar)
GB
5)(Fig. 9) of the equipment before the
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Fig. 10