Unigas KPBY70, Manual Of Installation - Use - Maintenance

Page: 36 / 193

PART III: OPERATION
36
11.0
AIR FLOW AND FUEL ADJUSTMENT
11.1 Adjustments - brief description
To change the burner setting during the testing in the plant, follow the next procedure.
Adjust the air and gas flow rates at the maximum output (“high flame”) first, by means of the air damper and the adjusting cam respec-
tively.
z
Check that the combustion parameters are in the suggested limits.
z
Check the flow rate measuring it on the fuel counter.
z
Then, adjust the combustion values corresponding to the points between maximum and minimum, according to the procedure
described on the “LMV5xx Service manual”.
z
Set, now, the low flame output (according to the procedure described on the “LMV5xx Service manual”) in order to avoid the low
flame output increasing too much or that the flues temperature gets too low to cause condensation in the chimney.
The heavy oil flow rate can be adjusted choosing a nozzle that suits the boiler/utilisation output and setting properly the delivery pres-
sure values.
Now adjust the pressure switches (see next par.).
11.2 User interface
The AZL2x.. display is shown below:
The keys functions are the following:
.ATTENTION:
During commissioning operations, do not let the burner operate with insufficient air flow (danger
of formation of carbon monoxide); if this should happen, make the fuel decrease slowly until the normal combu-
stion values are achieved.
IMPORTANT! the combustion air excess must be adjusted according to the values in the following chart.
Recommended combustion parameters
Fuel
Recommended (%) CO
2
Recommended (%) O
2
Heavy oil 11 ÷ 12.5 4.7 ÷ 6.7
Natural gas 9 ÷ 10 3 ÷ 4.8
Key F
Used to adjust the “fuel” actuator position ( F uel): :
While pressing the F key, the “fuel” actuator position can be changed by means of the + and - keys.