15
Installation
Gas train description
The burner's scope of delivery may
include a gas train. In this case, the bur-
ner and the gas train are issued with a
CE Declaration of Conformity. If the gas
train is not delivered with the burner, the
conformity of the burner is valid only if
the gas fittings and instruments and the
design of the gas train satisfy the bur-
ner test specified by EN 676 and meet
the Pressure Equipment Directive. Indi-
vidual testing will be necessary where
this is not the case.
The gas train delivered has its own
documentation including operating
instructions and a spare parts list.
There follows a general description of
the gas train.
Gas trains with a double valve are
intended for the supply, main shut-off,
gas filtration, gas pressure regulation
and monitoring of the gas supply. They
are compatible for use with gases con-
forming to the specifications of the gas
fittings and instruments. They are built
in accordance with EN 676. All function
parts have been individually tested and
awarded the CE marking and number
of the Notified Body. The preassembled
gas train is checked for leaks in the fac-
tory.
Low- and high-pressure gas
trains
If the outlet side of the regulator, i.e.
individual fittings and instruments
downstream of the gas pressure regula-
tor, has not been designed to be com-
patible with the maximum supply
pressure that occurs in the event of a
fault, the gas train must be equipped
with a safety shut-off valve (SSV) and a
safety relief valve (SRV) in accordance
with EN 676. This equipment is gene-
rally required for maximum supply pres-
sures of >360 mbar and > 500 mbar
respectively. These are known as high-
pressure gas trains.
If all fittings and instruments of the gas
train have been designed/approved for
the maximum supply pressure that
occurs in the event of a fault, the gas
train is known as a low-pressure gas
train. This is the case, depending on
component selection, for maximum
supply pressures of 360 and 500 mbar.
101
100
Burner
101
Impulse pipe gas pressure
120
Air flap
141
Ball valve
142
Gas filter
150
Gas control butterfly
151
Gas double valve (Siemens system illustrated)
155
Ignition unit
313
Min. gas pressure switch
314
Gas pressure switch for valve leak check or valve leak
checker
349
Actuator
Options in accordance with country-specific requirements:
143
Pressure gauge with pushbutton valve
147
Test burner with pushbutton valve
148
Compensator
154
Gas safety valve (additional)
313a Max. gas pressure switch
Gas train to EN 676, low pressure
12/2011 14 072 205
Summary of Contents for Low-NOx N10.12000.30 G-EU2
Page 33: ...34 Manufacturer s declaration...