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Absolute Boilers ABS 1500-2000-2500-3000-4000
7.3 Combustion setting and adjustment
Factory combustion readings Chart 8
Set point
High fire
CO2
CO ppm
O2
Factory combustion readings Chart 8
Set point
Set point
Low fire
CO2
CO ppm
O2
Check and correct, if necessary, the boiler for correct gas/ air ratio set-up. Checking takes place on full and part load, ad-
justment takes place only on the gas valve mono block. For checking and adjusting are required: an electronic CO2-gauge
(on the basis of O2) and a gas pressure gauge. Note that the opening (see fig. 23) around the measuring probe is sealed
properly during measurement. Note also that measuring the O2 levels in the flue gas is necessary, because direct mea-
surement of CO2 can lead to inaccuracies due to varying CO2 levels in the natural gas. Connect the gas pressure meter
between measuring point PG on the underside of the gas valve mono block and measuring point PL on the venturi (see
fig. 23), ensuring the connections are gas tight.
Check CO2- percentage (O2-percentage) against table
8. If the values exceed the given tolerances, adjust according to fig. 23. Check the flame through the inspection glass, the
flame must not blow off.
Check the flame through the inspection glass, the flame must not blow off. Repeat the check starting from point
ABS 1500
ABS 2000
9.7
9.58
65
87
3.6
9.58
ABS 1500
ABS 2000
7.8
7.96
23
12
7
6.6
ABS 2500
9.3
65
4.3
ABS 2500
8.63
5
5.5
56
ABS 3000
ABS 4000
9.3
54
4.3
ABS 3000
ABS 4000
7.4
15
7.7
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