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Commissioning
Gas connection
Gas connection
The gas lines and trains should be
installed and taken into operation in
accordance with the applicable
engineering standards and regulations.
The connection between the gas
distribution network and the gas ramp
must be performed by authorised
persons.
All the gas ramp components must be
fitted and installed without bending or
distortion or any other form of
mechanical stress.
The pipe diameters must be calculated
so that the loss of load does not exceed
5% of the distribution pressure.
A quarter turn manual valve (not
supplied) must be provided upstream of
the gas ramp and the filter.
The max. operating pressure for the
shut-off device must be 1.5 times the
max. connection pressure. Ease of
access must be guaranteed.
Precautions must be taken to prevent
unintentional actuation. The operating
position of the gate valve must be quite
obvious. The manually operated valve
should have fixed stops in the "OPEN"
and "SHUT" positions.
The filter must be installed on a
horizontal nozzle with the cover in the
vertical position to enable cleaning.
Depending on the current specification,
a thermally triggered shut-off valve must
be provided on site (not supplied).
All the gas ramp components must be
protected against condensation and if
necessary, a condensate trap (not
supplied) must be provided on site.
The threaded unions used must be in
conformity with present standards
(tapered male thread, straight female
thread with sealing provided in the
thread).
Sufficient space must be provided for
setting and maintaining the gas ramp
components (gas pressure switch,
valves, pressure regulator, gas filter,
test burner etc.) (see technical data).
50
Gas properties
Prior to any installation work make sure
to obtain the following data from the gas
supply company:
1. Type of gas
2. Calorific value Hu
= kWh/m
n
3. Max. CO
content of exhaust gas
2
4. Gas connection pressure and rest
pressure
Type of gas test
Prior to mounting the burner to the gas
feed line check the available type of gas
and burner type against the data given
on the burner nameplate (attached to
burner).
Be sure the description of the burner
and the type of gas are the same as
indicated on the nameplate.
Gas connection pressure
A minimum connection pressure must
be available upstream of the burner gas
valve to ensure that the burner operates
properly.
Take care to observe the mounting
instructions supplied by their
manufacturers (these are packed with
the valves). 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 train care should be taken to
observe the flue resistance of the
boiler and the gas pressure loss of
the burner and train.
Please note:
The absence of impurities and foreign
bodies must be checked before
installation and commissioning of the
gas ramp, the lever valves and unions.
Gas train
The gas train can be connected directly
to the gas feed line. Take care to
observe the correct order of
installation and direction of flow
(arrow on housing) of the valves.
Check the valves 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.
03/2016 - Art. Nr. 4200 1044 8002A
Leak test
The fitted gas train must be leak tested
on the system in accordance with
DVGW worksheets G600 and G490.
The gas line upstream of the burner gas
3
3
train must be installed in accordance
(kJ/m
)
with the applicable regulations, leak
tested, vented and certified accordingly
by the gas installation company. The
screw connections and flanged joints
must be checked for proper
leaktightness (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.
Venting
Please note:
Prior to putting the burner into operation
or after any repair work make sure to
vent the complete gas feed line and the
gas valve 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 train 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.
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