PART II: INSTALLATION
26
Once the train is installed, connect the gas valves group and pressure switches plugs.
Gas Filter (if provided)
The gas filters remove the dust particles that are present in the gas, and prevent the elements at risk (e.g.: burner valves, counters and
regulators) from becoming rapidly blocked. The filter is normally installed upstream from all the control and on-off devices.
Gas Proving System VPS504 (Option)
The VPS504 check the operation of the seal of the gas shut off valves. This check, carried out
as soon as the boiler thermostat gives a start signal to the burner, creates, by means of the
diaphragm pump inside it, a pressure in the test space of 20 mbar higher than the supply
pressure.
When wishing to monitor the test, install a pressure gauge ranged to that of the pressure sup-
ply point
PA
. If the test cycle is satisfactory, after a few seconds the consent light
LC
(yellow)
comes on. In the opposite case the lockout light
LB
(red) comes on. To restart it is necessary
to reset the appliance by pressing the illuminated pushbutton
LB
.
ATTENTION: it is reccomended to install the filter with gas flow parallel to the floor in order to prevent dust fall on
the safety valve during maintenance operation.
LC
LB
PA
