16
SETTING THE OIL FLOW RATE
ATTENTION: before starting the burner up, be sure that the manual cutoff valves are open and check
that the pressure upstream the gas train complies the value quoted on paragraph “Technical
specifications”. Be sure that the mains switch is closed.
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.
WARNING: NEVER LOOSE THE SEALED SCREWS! OTHERWISE, THE DEVICE WARRANTY WILL BE
INVALIDATE!
Prior to start up the burner, make sure that the return pipe to the tank is not obstructed. Any
obstruction would cause the pump seal to break.
IMPORTANT! the combustion air excess must be adjusted according to the in the following chart:
Recommended combustion parameters
Recommended (%) CO2
Recommended (%) CO2
Recommended (%) CO2
Light oil
11.5 ÷ 13
2.9 ÷ 4.9
Priming the pump and Oil rate adjustment
Before starting with the adjustments, it is necessary to prime the oil pump as follows:
1. Remove the burner cover;
2. start up the burner; with double-stage models turn the burner main switch A to On (Fig.5)
3. make the ST thermostat contacts close, see chapter “WIRING DIAGRAMS”;
4. wait until the EVG solenoid valve opens;
5. remove the photoresistor FR and ligth it up;
6. bleed the air from the pressure port (see paragraph “Light oil pumps”).
If the burner locks out, press the unlock pushbutton P (Fig.5) and repeat the procedure. Proceed with the adjustements
according to the single-stage or double-stage operation of the burner described below.
Fig. 5
Single-stage burners
The fuel flow rate is set choosing a nozzle that matches with the boiler output and setting the pump’s maximum inlet
pressure to 12 bar (see the hydraulic diagram in Fig. 6). To choose the correct nozzle refer to Tab. 1; as for setting the
pump pressure, see paragraph “Light oil pumps”
Note: pumps are set to 12 bar. The nozzle rate must be higher than the rate referred to the minimum burner output.
