Riello VPS 504 Manuel D'entretien page 10

2 VPS 504 valve leak detection control device
The valve leak detection control device is compulsory (EN 676) on the gas supply trains of burners with rated 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 depends on the volume to be pressurized 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
signaled by the red pilot light; lock-out continues until the valve leak detection control device is live.
An operation check can be carried out by slackening the screw of the pressure intake pa of the equipment before the 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 sockets; a reserve fuse is in the
upper part of the valve leak detection control device under the plug.
For the electrical wiring to the burner, refer to the
wiring diagrams in the burner manual.
WARNING
2915490
VPS 504 valve leak detection control device
3 GB
Fig. 1