Boiler installation 7
21
We reserve the right to make any changes due to technical modifications.
Installation and maintenance instructions Logano G124X II/SP special gas-fired boiler • Issue 04/2005
7.5 Fuel supply connection
7.5.1 Gas connections
For the gas pipe diameter required for the installation
please see
Tab. 4 and Tab. 5. Make sure that the pipe
fitting has the correct thread size.
Make sure that a sediment trap is installed at the inlet for
the gas supply pipe to the boiler. A gas cock shut-off
must be installed outside the boiler jacket if required by
the local code. We recommend installing a gas cock
shut-off in the main gas pipe to the boiler. The gas pipe
must be fastened outside the boiler.
The local codes must be observed during installation of
the gas connection, otherwise the regulations of the
National Fuel Gas Code, ANSI Z 223.1.
Tab. 4 Gas pipe supply volume
1 Maximum gas supply volume in cubic feet per hour, based on a
specific gas weight of 0.60 and a gas pressure of 0.5 psi or less
and a pressure rise corresponding to a water column of 0.3
inches.
Tab. 5 Equivalent lengths for pipe fittings
Disconnect the boiler with the gas shut-off rom the gas
supply pipe system the system is pressure tested with a
test pressure greater than 1/2 psi.
Fig. 21 Pipe connection to gas fittings – back view
1 Gas supply
2 Shut-off
3 Sediment trap
1
2
3
WARNING!
DANGER OF EXPLOSION
Leakage from the gas pipes and gas
connections may cause an explosion.
z Use soap solution to find leaks.
Length
of
Ironpipe
in feet
Gas pipe supply volume in cubic feet of gas
per hour
1
1/2 3/4 1 1 1/4 1 1/2
10 132 278 520 1060 1600
20 92 190 350 730 1100
30 73 152 285 590 890
40 63 130 245 500 760
50 56 115 215 440 670
75 45 93 175 360 545
100 38 79 160 305 480
150 31 64 120 250 380
Nominal
diameter of
iron pipe
(inches)
Equivalent lengths for pipe fittings in
feet
Pipe fitting type
90° angle T-piece Ball valve
Gas
valve
Equivalent lengths in feet
1/2 1.4 2.7 0.3 0.80
3/4 2.1 4.1 0.5 1.25
1 2.6 5.2 0.6 1.6
1 1/4 3.5 6.9 0.8 2.15
1 1/2 4.0 8.0 0.9 2.50
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