Riello VGD 50 Manuel D'entretien page 17

Notes
Fit pulse lines P and P
C
- The tube connecting valve tap P
the combustion chamber. In addition, it is important not to rest the tube (P
the high temperature might damage it.
Failure to do so may cause the valve to malfunction, and to be damaged.
- Keep the pulse lines route as short as possible.
- Once connected, check the atmospheric seal of tubing and pulse lines.
Use leak finder spray on the suspect spot only.
Test pressure: p
max.
After assembly, check the train for leaks and make sure it is operating properly.
To disassemble, follow the same procedure in reverse order.
ELECTRICAL LAYOUT, (see Fig. 9)
For electrical connections, refer to the burner instruc-
tions manual.
MINIMUM GAS
ADJUSTMENT (Fig. 10)
Adjust the low gas pressure switch (3, fig. 1), after
carrying out all the other adjustments of the burner
with the gas pressure switch adjusted at the begin-
ning of the scale.
Let the burner work at the required output.
Close slowly the gate valve until the pressure, meas-
ured on the gas pressure switch gauge, comes down
of 5 - 6 mbar with regard to the working value.
Rotate slowly the gas pressure switch handle until the
operation of the same gas pressure switch and the
resultant burner shut-down.
Open completely the gate valve.
FILTER MAINTENANCE
The filter element may be replaced by removing the up-
per cover of the filter after having loosened the screws
holding it.
VPS 504 VALVE LEAK DETECTION CON-
TROL DEVICE
The valve leak detection control device is compulsory
(pr EN 676) on the gas supply trains of burners with rat-
ed maximum output greater than 1200 kW.
Note
The gas train leaves the factory without the valve leak
detection control device.
it is possible to install the valve leak detection control device on trains that do not have it, by requesting the kit (see
table page 14).
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 p
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.
as indicated in the burner's instruction manual.
A
with the boiler tap must be positioned so that any condensate is drained into
C
= 100 mbar.
PRESSURE SWITCH
and P
C
D3210
D4470
17
GB
) against the boiler's door as
A
VR - Adjustment valve
VS - Safety valve
of the equipment before the check;
A
Fig. 9
Fig.10
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