68
Gas Connection
For the installation and taking into ope-
ration of the gas lines care should be
taken to observe the regulations of
DVGW (German Association of the Gas
and Water Sector) especially DVGW-
TRGI (Technical Regulation for Gas
Installations) and TRF (Technical Regu-
lation for Furnaces).
DIN 4756 and TRD 412 contain specifi-
cations for the construction, design and
safety requirements of gas furnaces in
heating installations. Furnace systems
of higher operating pressures are sub-
ject to the DVGW Worksheets G 460
and G 461. The gas lines must meet
specifications set out in DVGW-TRGI in
the case of furnace systems with opera-
ting pressures up to 100 mbar or above
100 mbar.
Gas control group with two gas
valves and leak tester:
The gas section is designed in accor-
dance with EN 676 and TRD 412, two
gas valves and leakage tester are
prescribed for burners with a capacity
above 1200 kW.
The operation, mounting and adjust-
ment of the valve leak testers is descri-
bed in detail on a separate sheet.
Gas connection pressure:
The gas line must be dimensioned in
accordance with the throughput rate
and the available gas pressure and
installed to the burner on the shortest
possible way with minimum pressure
loss.
To provide the most effective conditions
for start-up, take care that the burner
and gas stop valve are installed with the
minimum possible distance between
one another. This means that the 2
nd
gas valve (looking in the direction of the
gas flow) should be mounted in the
immediate vicinity of the burner.
Note the gas pressure loss of the gas
control group and burner. The gas con-
trol group can be connected directly to
the gas feed line. Note the order in
which the valves and instruments are
mounted and the direction of flow. Prior
to installation and taking into operation,
check the valves and instruments and
the connection fittings for the possible
accumulation of dirt and foreign matter.
1
Gas stop valve
2
Ignition gas pressure regulator
3
Ignition gas solenoid valves
4
Gas filter
5
Pressure gauge with pushbutton
valve
6
Test burner
7
Gas meter
8
Gas pressure switch
10
Gas pressure regulator with safety
blow-off valve
11
Safety blow-off valve
12
Gas motor valve 1/solenoid valve
13
Gas motor valve 2/solenoid valve
14
Compensator
15
Gas butterfly control valve
16
Gas pilot burner
17
Burner
Gas connection
> 100 mbar
Ignition gas connection
min. 50 mbar
max. 150 mbar
