Buderus Logamax plus Installation Instructions Manual page 18

6 Installation
6.3.3 Making the gas connection
DANGER
Only carry out work on gas lines if you are a
qualified gas fitter.
The manual gas shutoff valve is part of the pump group,
and is installed in accordance with the pump group instal-
lation instructions.
Determine proper size gas pipe for the installation using
table 3 and table 4. Do not forget the pipe fitting losses
and observe proper size of the fittings.
Connect the gas supply pipe to the manual gas shutoff
valve, so that it is free from any strain.
NOTICE
When installing the gas supply connection, it
must comply with local regulations or, if such
regulations do not exist, with the National Fuel
Gas Code, ANSI Z 223.1./NFPA 54.
In Canada, the gas supply connection must
comply with local regulations or, if such regula-
tions do not exist, with CAN/CSA B149.1,
Natural Gas and Propane Installation Code.
A sediment trap must be provided upstream of the manual
gas shutoff valve, but downstream of the appliance gas
valve.
18 Logamax plus GB162-80 kW/100 kW - Subject to modifications resulting from technical improvements!
Length of Gas Volume Capacity in ft
pipe in feet
¾"
(m)
10 (3.05) 278
20 (6.1) 190
30 (9.15) 152
40 (12.2) 130
50 (15.25) 115
75 (22.88) 93
100 (30.5) 79
150 (47.25) 64
Table 3 Gas Pipe Capacity for different pipe sizes
1 Maximum pipe capacity in ft
.60 (42 mbar) and a inlet gas pressure of 14 inches W.C.
(35 mbar) or less and a pressure drop of .3 inches W.C. (20 mbar)
Steel pipe Equivalent length for Pipe Fittings in feet (m)
diameter
Type of pipe fitting
in inches
90°-Elbow
(mm)
(flow thru
branch)
Equivalent length in feet (m)
¾ (19) 2.1 (0.64) 4.1 (1.25)
1 (25) 2.6 (0.79) 5.2 (1.59)
1 ¼ (32) 3.5 (1.07) 6.9 (2.11)
1 ½ (38) 4.0 (1.22) 8.0 (2.44)
Table 4 Equivalent length for pipe fittings in feet
3 1
/ hr
1" 1 ¼" 1 ½"
520 1,060 1,600
350 730 1,100
285 590 890
245 500 760
215 440 670
175 360 545
160 305 480
120 250 380
3
/hr, based on a specific gravity of
Tee Gate valve Gas cocks
0.5 (0.15) 1.25 (0.38)
0.6 (0.18) 1.60 (0.49)
0.8 (0.24) 2.15 (0.66)
0.9 (0.27) 2.50 (0.76)