Buderus Logamax plus GB142-24 Servicing Instructions page 127

Boiler capacity Type of gas supply
Natural gas H
24 kW
LPG P
Natural gas H
30 kW
LPG P
Natural gas H
45 kW
LPG P
Natural gas H
60 kW
LPG P
table 5 Gas orifice diameter
Type of gas Factory setting of gas burner fitting
supply
H
Natural gas Delivered factory-set to Wobbe index
14.1 kWh/m
14.7 psi (=1,013 mbar)), suitable for
Wobbe index range 11.3 – 15.2 kWh/m
Information on gas type instruction plate:
Set to gas category: G 20 – 2E.
Previous indications: set to Wobbe index
15.0 kWh/m
(=1,013 mbar)), suitable for
Wobbe index range 12.0 – 15.7 kWh/m
P
LPG Suitable for propane after conversion (also see
the chapter "Conversion to another type of gas
supply").
Information on gas type instruction plate:
Set to gas category: G 31 – 3P.
Table 6 Factory setting of gas burner fitting
 The diameter of the gas orifice islocated on the gas orifice.
 The article number of the Venturi is located on both clamps of
the Venturi (see fig. 111, pos. 1 and 2).
Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
Venturi article
number
423.072A
423.072A
423.072A
423.072A
423.170A
423.170A
423.173A
423.173A
3
(based on 59 °F (=15°C),
3
3
(based on 32 °F (=0°C), 14.7 psi
3
Gas orifice diameter Altitude 0 - 10,200 ft
No CO correction
2
[inch]
0.175
0.132
0.175
0.132
0.213
0.163
0.295
0.213
.
.
fig. 111 Venturi article number
Altitude 4,001 - 10,200 ft
with CO
2
[mm] [inch]
4.45 0.179
3.35 0.134
4.45 0.177
3.35 0.134
5.40 0.219
4.15 0.163
7.50 0.301
5.40 0.215
2
Appendix 9
correction
[mm]
4.55
3.40
4.50
3.40
5.55
4.15
7.65
5.45
1
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