Unigas HTLX92R Installation Manual page 18

PART II: INSTALLATION
GAS TRAIN CONNECTIONS
The diagrams show the components of the gas train included in the delivery and which must be fitted by the installer.The diagrams are
in compliance with the current laws.
Note: the figure is indicative only
"direction" arrows for installation
3
1E
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

VGD40 and MBE: make sure the gaskets are correctly positioned between the flange

fasten all the components with screws, according to the following diagrams

make sure bolts on the flanges are properly tightened

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.
To mount the gas train, proceed as follows:
-
In case of threaded joints: use proper seals according to the gas used- in case of flanged joints: place a gasket between the ele-
1
ments
Fasten all the items by means of screws, according to the diagrams showed, observing the mounting direction for each item
2
NOTE: the bellows unit, the manual cutoff valve and the gaskets are not part of the standard supply
4
1C
2
1D
gas supply network
1A
5
1B
Keys
1A..1E Gasket
2 Gas filter
3 Gas valves group
4 Bellows unit
5 Manual valve
18