25
ADJUSTING AIR AND FUEL RATE
Adjustments - brief description
z
Adjust the air and oil flow rates at the maximum output (“high flame”) first, by means of the air damper and the adjusting cam
respectively.
z
Check that the combustion parameters are in the suggested limits.
z
Then, adjust the combustion values corresponding to the points between maximum and minimum: set the shape of the adjusting
cam foil. The adjusting cam sets the air/fuel ratio in those points, regulating the opening-closing of the fuel governor.
z
Now set the low flame output, acting on the low flame microswitch of the actuator in order to avoid the low flame output increasing
too much or the flues temperature getting too low to cause condensation in the chimney.
Now, adjust the burner according to the actuator model provided.
Oil Flow Rate Settings by means of Berger STM30../Siemens SQM40.. actuator
1
Check the fan motor rotation.
2
Prime the oil pump acting on the related contactor (
CP
- see next picture): check the pump motor rotation (see “Fan and pump
motors direction” on page 11) and keep pressing for some seconds until the oil circuit is charged;
3
bleed the air from the
M
pressure gauge port (Fig. 17) by loosing the cap without removing it, then release the solenoid starter.
Fig. 19
4
Before starting the burner up, drive the high flame actuator microswitch matching the low flame one (in order to let the burner ope-
rates at the lowest output) to safely achieve the high flame stage.
5
Turn the burner on by means of its main switch
A
(see next picture): if the burner locks (LED
B
on in the control panel) press the
RESET button (
C
) on the control panel - see chapter “OPERATION”.
ATTENTION:
before starting the burner up, be sure that the manual cutoff valves are open. 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.
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.
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
≤
50cSt (7° E) @ 50° C
11 ÷ 12
4.2 ÷ 6.2
Heavy oil
≥
50cSt (7° E) @ 50° C
11 ÷ 12.5
4.7 ÷ 6.7
Suntec TA..
CP
VR
M
