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The value reported in the table can be a reference for a good
combustion setting.
EN 676
Theoretical max.
Calibration CO
CO
GAS
2
0 % O
2
G 20
11,7
G 25
11,5
G 30
14.0
G 31
13,7
EN 267
Calibration CO
Theoretical max. CO
2
0 % O
2
15,2
6.7.1
Maximum output
Set the servomotor to maximum opening so that the air dampers
are fully open.
6.7.2
Minimum output
Max output of the burner must be set within the firing rate range
shown on page 10.
Turn the "decrease output" selector 2) (Fig. 33) and keep it
turned towards "-" until the servomotor has closed the air
damper and the gas butterfly valve is at 35° (factory setting).
Adjustment of air delivery
Progressively adjust the starting profile of cam 1) (Fig. 35) by
turning the screws 2) (Fig. 35).
It is preferable not to turn the first screw since this is used to set
the air gate valve to its fully-closed position.
6.7.3
Intermediate outputs
Once you have adjusted the burner's maximum and minimum
output, the next step is to adjust air and gas at the various inter-
mediate servomotor positions.
You can switch from one position to the next by holding selector
2) (Fig. 33) on the (+) or (-) symbol.
For improved adjustment repeatability, make sure you stop rota-
tion of the cam assembly when the upper bearing running on the
profile 4) (Fig. 35) is aligned with one of the adjusting screws 2)
(Fig. 35).
Tighten or loosen the preselected screw 2) (Fig. 35) to increase
or decrease airflow so as to adapt it to the corresponding gas
flow.
Once output adjustments (maximum, medium and intermediate)
have been carried out, it is important you secure all the air regu-
lation screws 2) (Fig. 35) with the locking screws 3) (Fig. 35) so
as to prevent possible shifting of air-gas setting positions.
20010305
Start-up, calibration and operation of the burner
Excess air
Max output
Min output
λ ≤ 1,2
λ ≤ 1,3
%
2
CO
mg/kWh
λ = 1,2
λ = 1,3
≤ 100
9,7
9.0
≤ 100
9,5
8.8
≤ 100
11,6
10,7
≤ 100
11,4
10.5
Excess air
Max output
Min output
λ ≤ 1,2
λ ≤ 1,3
%
2
CO
mg/kWh
λ = 1,2
λ = 1,3
≤ 100
12,6
11,5
1
D1499
Key to layout (Fig. 35)
1
Cam
2
Adjustment screws
3
Fixing screws
4
Variable profile
30
GB
2
3
4
Fig. 35
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