22
Installation and maintenance instructions Logano GA124 special gas-fired boiler • Issue 04/2005
We reserve the right to make any changes due to technical modifications.
Boiler installation
7
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 shut-off must be
installed outside the boiler jacket if required by the local
code. We recommend installing a gas shut-off in the
main gas pipe to the boiler. The gas pipes 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 gradient corresponding to a water column of
0.3 inches.
Tab. 5
Equivalent lengths for pipe fittings
Disconnect the boiler with the gas shut-off from the gas
supply pipe system the system is pressure tested with a
test pressure greater than 1/2 psi.
Fig. 20
Pipe connection to gas fittings – back view
1
Gas feed
2
Hand stop valve
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 pipe
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 Stop 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
