Ignition Pilot Burner; Burner Ignition; Combustion Air Adjustment - Riello DB 12 LSM C13 Installation, Use And Maintenance Instructions

6.9

Ignition pilot burner

For correct functioning, adjust the gas pressure (measured on
the socket located on the valve) to between 30 ÷ 50 mbar .
Gas
G20
G31
Check pilot flame stability before starting up the
main burner.
WARNING
Continue with the ignition of the burner making sure the pilot has
ignited properly.
6.10

Burner ignition

The burner should light after having performed the above steps.
If the starting cycle has completed but the flame does not appear
and the control box goes into lockout, reset it and wait before try-
ing again.
If ignition is still not achieved, it may be that gas is not reaching
the combustion head within the safety time period of 3 seconds;
In this case increase gas ignition delivery.
6.11

Combustion air adjustment

The fuel/combustion synchronization is made by means of a ser-
vomotor connected to two variable profile cams, which act on the
outlet air damper 1) (Fig. 32) and the gas damper 2)(Fig. 32) and,
using special levers, on the combustion head.
It is advisable, to reduce the loss and for a wide calibration field,
to adjust the servomotor to the maximum of the output used, the
nearest possible to the maximum opening (130°).
On the gas butterfly valve, fuel step according to the burner out-
put required, with servomotor completely open, is carried out by
the pressure stabiliser placed on the train.
The values in the Tab. K and Tab. L can be useful as reference
for a good calibration of the fuel.
20119307
Start-up, calibration and operation of the burner
3
mbar Sm /h
1.5 12.3
1.4 3.2
Tab. J
20119787
The arrival of the gas at the pipe coupling is shown on the U-
shaped pressure gauge (Fig. 30) or else with the help of a digital
pressure gauge on the pressure test point under the pipe cou-
pling.
If further burner lockouts occur, refer to the "Reset procedure" in
the equipment manual supplied with the main panel.
Once the burner has fired, now proceed with global calibration
operations.
EN 676
Theoretical max
GAS CO
0 % O
G 20 11.7
G 25 11.5
G 30 14.0
G 31 13.7
EN 267
Theoretical max CO
0 % O
2
15.2
30 GB
Air excess
Max. output.
λ ≤ 1.2
CO % Calibration
2
2
λ = 1.2 λ = 1.3
2
9.7 9.0
9.5 8.8
11.6 10.7
11.4 10.5
Air excess
Max. output.
λ ≤ 1.2
CO % Calibration
2
2
λ = 1.2 λ = 1.3
12.6 11.5
20119787
Fig. 31
Min. output
λ ≤ 1.3
CO
mg/kWh
≤ 100
≤ 100
≤ 100
≤ 100
Tab. K
Min. output
λ ≤ 1.3
CO
mg/kWh
≤ 100
Tab. L