Unigas N1300A, Manual Of Installation - Use - Maintenance

Page: 16 / 44

PART II: INSTALLATION
16

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
Gas train with valves group VGD and MBE with built-in gas pressure go gas leakage pressure
switch (PGCP)
Legend
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 proving system VPS504
1 Filter (*optional) 6 Butterfly valve
2 Pressure switch - PGMIN 8 Main burner
3 Safety valve with built in gas governor 9 Manual valve(*optional)
4 Proving system (*if provided) 10 Bellows unit(*optional)
5 Pressure switch PGMAX:included MBE, for VGD e MB-DLE Optional
1 Filter 6 Butterfly valve
2 Pressure switch - PGMIN 7 Pressure transducer
3 Safety valve with built in gas governor 8 Main burner
4 Proving system pressure switch - PGCP 9 Antivibration joint (*optional)
5 Pressure switch PGMAX: mandatory for MBE, optional for VGD and MB-DLE 10 Manual valve(*optional)
GAS INLET
SUPPLIED BY BURNER
CONSTRUCTOR
BY OTHERS
M
PS PSL PSH
PT
7
MBE
1 9 10
M
PS PSL PSH
VGD
1 9 10
GAS INLET
GAS INLET
SUPPLIED BY BURNER CONSTRUCTOR
BY OTHERS