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EN
INSTALLATION
Gas line
CONNECTION DIAGRAM FOR BURNERS WITH
GAS TRAIN SIEMENS VGD...
To be supplied by the installer
141
143
Gas
To be supplied by the installer
GAS VALVES AND INSTRUMENTS GROUP
The gas valves and instruments group used
with the furnace will be selected according to
the specific requirements to be met by a
burner system.
The following factors must be taken into
account:
• burner output
• furnace back pressure
• gas pressure loss of the burner head
• gas pressure losses of the gas valves and
instruments group
GAS CONNECTION PRESSURE
A minimum connection pressure must be
available upstream of the burner gas valve
to ensure the proper functioning of the
burner.
WARNING: the total gas pressure loss
must always be smaller than the available
gas flow pressure.
For the installation of the valves and
instruments group take care to observe the
mounting instructions supplied by their
manufacturers (these are packed with the
equipment).
The gas line installed to the burner must
be dimensioned in accordance with the
throughput rate and the available
pressure.
For selecting the nominal bore "DN" of the
gas valves and instruments group care
should be taken to observe the flue
resistance of the boiler and the gas
pressure loss of the burner and valves and
instruments group.
GAS VALVES AND INSTRUMENTS GROUP
The gas valves and instruments group can
be connected directly to the gas feed line.
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160
313
144
142
151
Air
NOTE: Only gas trains assembled by the burner manufacturer and approved in
accordance with the burner test specifications.
EN676 compulsory kit and accessories in order to comply to the safety regulations.
Additional accessories and kits shall be installed by the installer in accordance to the
local safety regulations and codes of practise.
Take care to observe the correct order of
installation and direction of flow (arrow on
housing).
Check the valves and instruments and
connection pieces for absence of dirt
particles and foreign matter before
installation and initial operation. To provide
effective conditions for start-up make sure
the distance between the burner and the
gas stop valve is as short as possible.
LEAK TEST
The gas line upstream of the burner gas
valves and instruments group must be
installed in accordance with the applicable
regulations, checked for absence of leaks,
vented and certified accordingly by the gas
installation company. The screwed unions
and flanged joints must be checked for
proper tightness (by making a pressure
test). The leak test must be made under
pressure using approved foaming agents
which do not cause corrosion. For steam
boiler furnaces the result of the leak test
must be duly certified.
100 Burner
120 Air damper
141 Ball valve
142 Gas filter
143 Antivibration coupling
144 Gas governor
150 Throttle valve
151 Gas train Siemens VGD....
160 Kit tightness control (optional)
313 Min.gas pressure switch
314 Max.gas pressure switch (optional)
349 Air/gas damper motor
314
100
150
120
M
349
VENTING
Prior to taking the burner into operation or
after any repair work make sure to vent the
complete gas feed line and the gas valves
and instruments group into the open
atmosphere (e.g. by means of a hose)
taking care to avoid any hazards.
In no case should the gas line be vented
into the heating or furnace chambers.
Make use of a test burner to check the
gas-carrying spaces are free from an
inflammable gas mixture.
SUPPORT
The valves and instruments group must be
supported with a telescopic jacking
member or similar during and after
installation (e.g. on filter and valve).
JOINT
It is recommended to provide an easy to
disconnect joint (with planar sealing faces)
to facilitate repair work on the boiler
(furnace) and allow the boiler door to be
swivelled out if required.
420010717300
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