28
Bentone
Lower heat value Hu at normal state 15°C and 1013.25 mbar EN676
Grade of gas
kWh/Nm
3
MJ/Nm
3
kcal/Nm
3
Natural gas
G20
9.5
34.02
8126
Natural gas
G25
8.2
29.25
6986
Propane
G31
24.6
88.00
21019
Butane
G30
32.5
116.09
27728
6.3 Recommended excess air when
using default setting
Grade of gas
Excess air flue gases
Max. % CO
2
% O
2
% CO
2
Lambda 1.2
Natural gas
3–5
≈10
11.9
Propane
3–5
≈11.5
13.9
Butane
3–5
≈11,5
14,1
Liquefied petroleum
gas (LPG)
3–5
≈11
13,8
6.4 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.
172 515 27 2018-01-11
Summary of Contents for STG 120/2
Page 17: ...17 Bentone 4 9 Gas nozzle Inner assembly Natural LPG Natural gas LPG 2 5 8...
Page 35: ...35 Bentone 172 615 76 2020 10 16 2 9 1 Wiring diagram Gas burner control LME21...
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