Installation and operating instruction
Oil condensing boiler WTC-OB 18-B
7 Commissioning
83311002 1/2018-03 La
68-132
7.6 Check combustion
Determine excess air
Slowly reduce O
2
content until the combustion limit is reached
(CO content approx. 100 ppm or smoke number approx. 1).
Measure and document O
2
content.
Read air number (λ).
Increase air number to ensure sufficient excess air:
by 0.1 (equates to 10 % excess air),
by more than 0.1 for more difficult conditions, such as:
dirty combustion air,
fluctuating chimney draught.
Example
λ + 0.1 = λ*
Set air number (λ*), do not exceed CO content of 50 ppm.
Measure and document O
2
content.
