PART II: INSTALLATION
14
ADJUSTMENTS
Adjusting the fuel flow rate
The fuel rate is setting choosing properly sized nozzles and adjusting the fuel pressure at the pump inlet (see the diagram Fig. 9). To
choose the nozzles refer to tables below; for pump pressure regulation see next tables.
ATTENTION:
before starting the burner up, be sure that the manual cutoff valves are open. Be sure that the mains
switch is closed.
Before starting up the burner, make sure that the return pipe to the tank is not obstructed. Any obstruction would
cause the pump seal to break.
.
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 combustion values are achieved.
IMPORTANT! the combustion air excess must be adjusted according to the in the following chart:
Recommended combustion parameters
Fuel
Recommended (%) CO
2
Recommended (%) O
2
Light oil
11.5 ÷ 13
2.9 ÷ 4.9
Note: all pumps are set to 12 bar. The nozzle rate must be higher than the rate referred to the minimum burner
output.
Key
EV
Fuel solenoid valve
EVG1 Fuel solenoid valve - low flame
EVG2 Fuel solenoid valve - high flame
M
Manometer
P
Pump
Fig. 9
EVG1
P
M
EVG2