elco N6.2400 G-R, Руководство по эксплуатации, Страница: 9 / 28

10/2010 - Art. Nr. 4200 1030 6900A 9
Assembly
Gas connection
Gas connection
The gas lines and valves and
instruments group 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 done by authorised persons.
The section of the pipings must be
calculated so that the loss of load
doesn’t exceed 5% of the distribution
pressure.
A quarter turn manual valve (not
supplied) must be provided for upstream
of the gas ramp and the filter.
The filter must be installed on a
horizontal nozzle with the cover in the
vertical position to enable cleaning.
The threaded unions used must be in
conformity with present standards
(tapered male thread, straight female
thread with sealing provided in the
thread).
Provide for sufficient space to access
the gas pressure switch adjustment.
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 H
un
=kW/m³ (kJ/m³)
3. maximum CO
2
content of exhaust gas
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 the proper functioning of
the burner.
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
.
Caution!
The absence of impurities and foreign
bodies must be checked before
installation and commissioning of the
gas ramp, the lever valves and unions.
Gas valves and instruments group
The gas valves and instruments group
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).
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.
Venting
Caution
! 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 easyto-
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.
en