Gas Feeding; Gas Feed Connection To The Burner; General Gas Supply Layout (Example) - Riello DB 20 SE FGR TC FS1 FB A0 T150 Installation, Use And Maintenance Instructions

5.9

Gas feeding

Explosion danger due to fuel leaks in the pres-
ence of a flammable source.
Precautions: avoid knocking, attrition, sparks and
heat.
Make sure the fuel interception tap is closed be-
fore performing any operation on the burner.
The fuel supply line must be installed by qualified
personnel, in compliance with current standards
and laws.
WARNING
5.9.1

Gas feed connection to the burner

Burner connection
The burner connection to the gas train is carried out by way of at-
tachment to the flange.
The dimensions of the flange are shown in Fig. 8, page 13.
Use the relative adapters to connect the gas flange to the train,
supplied as accessories.
5.9.2

General gas supply layout (example)

D3897
Key (Fig. 17)
BP Pilot burner
C Vibration damping joint
GF Gas filter
HPG High gas pressure regulator
LPG Low gas pressure regulator
MM Pressure gauge
PA Minimum air pressure switch
PCV Pilot gas pressure regulator
PGM Maximum gas pressure switch
20136081
Installation
Pilot burner connection
The burner is fitted with a dedicated gas train that is fixed above
the pipe coupling.
It should be connected to the main train downstream the filter or
the pressure adjuster (depending on configuration).
Fig. 16 shows the natural gas version.
S9336
Supply pressure 50 ÷ 500 mbar
PART THAT IS THE RESPONSIBILITY
OF THE INSTALLER/USER
PGm Minimum gas pressure switch
RG Gas butterfly valve
SRV Pressure limiting valve with outlet into the environment
VE Fan
VP Pilot solenoid valves
VPS Leak detection control device
VR Gas pressure regulator solenoid valve
VS Gas safety solenoid
18 GB
Fig. 16
max. 500 mbar
0.5 ÷ 4 bar
Fig. 17