Buderus Logamax plus - Page 18

Installation6
Logamax plus GB162-80 kW/100 kW - Subject to modifications resulting from technical improvements!18
6.3.3 Making the gas connection
z The manual gas shutoff valve is part of the pump group,
and is installed in accordance with the pump group instal-
lation instructions.
z 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.
z Connect the gas supply pipe to the manual gas shutoff
valve, so that it is free from any strain.
A sediment trap must be provided upstream of the manual
gas shutoff valve, but downstream of the appliance gas
valve.
Length of
pipe in feet
(m)
Gas Volume Capacity in ft
3
/ hr
1
¾" 1" 1 ¼" 1 ½"
10 (3.05) 278 520 1,060 1,600
20 (6.1) 190 350 730 1,100
30 (9.15) 152 285 590 890
40 (12.2) 130 245 500 760
50 (15.25) 115 215 440 670
75 (22.88) 93 175 360 545
100 (30.5) 79 160 305 480
150 (47.25) 64 120 250 380
Table 3 Gas Pipe Capacity for different pipe sizes
1 Maximum pipe capacity in ft
3
/hr, based on a specific gravity of
.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)
DANGER
Only carry out work on gas lines if you are a
qualified gas fitter.
Steel pipe
diameter
in inches
(mm)
Equivalent length for Pipe Fittings in feet (m)
Type of pipe fitting
90°-Elbow Tee
(flow thru
branch)
Gate valve Gas cocks
Equivalent length in feet (m)
¾ (19) 2.1 (0.64) 4.1 (1.25) 0.5 (0.15) 1.25 (0.38)
1 (25) 2.6 (0.79) 5.2 (1.59) 0.6 (0.18) 1.60 (0.49)
1 ¼ (32) 3.5 (1.07) 6.9 (2.11) 0.8 (0.24) 2.15 (0.66)
1 ½ (38) 4.0 (1.22) 8.0 (2.44) 0.9 (0.27) 2.50 (0.76)
Table 4 Equivalent length for pipe fittings in feet
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.