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GAS TRAIN CONNECTIONS
WARNING: before executing the connections to the gas pipe network, be sure that the manual cutoff valves are
closed.
ATTENTION: it is recommended to mount filter and gas valves to avoid that extraneous material drops inside the
valves, during maintenance and cleaning operation of the filters (both the filters outside the valves group and the
ones built-in the gas valves).
ATTENTION: once the gas train is mounted, the gas proving test must be performed, according to the procedure
set by laws in force.
CAUTION: The direction of gas flow must follow the arrow on the body of the components mounted on the gas
ramp (valves, filters, gaskets...).
NOTE: the bellows unit, the manual cutoff valve and the gaskets are not part of the standard supply
Following the "Hydraulic Schematics" section, the figure shows the components fitted by the installer.
Keys
1
Gas filter
3
Gas valves group
9
Bellows unit
10
Manual valve
11
Gasket(a, b, c, d)
Procedure to install the double gas valve unit: two (2) gas flanges are required; they may be threaded or flanged depending on
size
first step: install the flanges to prevent entry of foreign bodies in the gas line
on the gas pipe, clean the already assembled parts and then install the valve
unit check gas flow direction: it must follow the arrow on the valve body
VGD20: make sure the O-rings are correctly positioned between the flanges
and the valve
In all cases:
ensure that the gaskets are correctly positioned between the flanges;
fasten all the components with screws, according to the following diagrams:
make sure bolts on the flanges are properly tightened
check that the connections of all components are leak .
CAUTION: Use seals suitable for the gas used.
WARNING: Slowly open the fuel cock to avoid breaking the pressure
regulator.
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.
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.
Once the train is installed, connect the gas valves group and pressure switches plugs.
PART III: INSTALLATION
3
17
10
9
1
11c
11 d
A
gas supply network
11a
11b
B
B
C
B
B
A
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