18
Installation and maintenance instructions Gas Boiler Logano GC124 II/SP • Issue 07/2006
We reserve the right to make any changes due to technical modifications.
Boiler installation
7
7.4
Fuel gas supply connection
7.4.1 Gas connections
For the gas pipe diameter required for the installation
please see
Î
Tab. 4 and
Î
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 manual stop valve
must be installed outside the boiler jacket if required by
the local code. We recommend installing a manual
shut-off valve 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 piping connections, otherwise the regulations of
the National Fuel Gas Code, ANSI Z 223.1 must be fol-
lowed.
z
Install gas piping without any undue stress on the
piping.
z
The Commonwealth of Massachusettes prohibits the
use of copper tubing for the gas line.
Gas carrying capacity (refer to technical manual
Î
Chapter 18, page 79)
Tab. 5
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.
Fig. 13
Gas piping connection to gas valve – right or left side
1
Gas feed
2
Manual shut-off 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.
Nominal
diameter of
iron pipe
(inches)
Equivalent lengths for pipe fittings in
feet
Pipe fitting type
90°-
angle
T-piece
Shut-off
valve
Gas
shut-off
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
Tab. 4
Equivalent lengths for pipe fittings
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