Unigas LAMTEC BT3 Series, Manual Of Installation - Use - Maintenance

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PART II: INSTALLATION
20
GAS TRAIN CONNECTIONS
The diagrams show the components of the gas trai included in the delivery and which must be fit-
ted by the installer.The diagrams are in compliance with the current laws.
Procedure to install the double gas valve unit:
- two (2) gas flanges are required; they may be threaded or not depending on size;
- first step: install the flanges to prevent the 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 flanges;
- fasten all the components with screws, according to the following diagrams;
- make sure bolts on the flanges are properly tightened;
Key
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 according to the diagram on Fig. 1, the gas proving test mus be per-
formed, according to the procedure set by the laws in force.
Gas train with valves group VGD with built-in gas pressure go gas leakage pressure switch (PGMIN/LT)
1 Filter 8 Main burner
3 Safety valve with built in gas governor 9 Bellows unit(*optional)
5 Pressure switch - PGMAX(*optional) 10 Manual valve(*optional)
6 Butterfly valve 12 Pressure switch - PGMIN/LT (proving system
and minimum gas pressure)
PS PSH S
M
GAS INLET
SUPPLIED BY BURNER
CONSTRUCTOR
BY OTHERS