Recommended Excess Air When Using Default Setting; Determining The Gas Quantity For The System - Bentone BG 550-2 Installation And Maintenance Instruction

5.6 Recommended excess air when
using default setting
Grade of gas
Natural gas
Propane
Butane
Liquefied petroleum
gas (LPG)
5.7 Determining the gas quantity for
the system
The heat values indicated are normal values; the heat value varies according
to the origin of the gas. For more exact information on values, contact the
gas distributor.
Lower heat value Hu at normal state 15°C and 1013.25 mbar EN676
Grade of gas
Natural gas G20
Natural gas G25
Propane G31
Butane G30
Excess air flue gases
% O % CO Lambda 1.2
2 2
3–5 ≈10
3–5 ≈11.5
3–5 ≈11,5
3–5 ≈11
kWh/Nm 3 MJ/Nm 3
9.5 34.02
8.2 29.25
24.6 88.00
32.5 116.09
Max. % CO
2
11.9
13.9
14,1
13,8
kcal/Nm 3
8126
6986
21019
27728
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