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START-UP
Adjusting the intermediate burner capacity
In order to adjust intermediate capacity of the burner use the selector on position 0
to stop the stroke and regulate the cam on the different screw position.
The adjustment shall be done according to the drawing in order to have the
correct combustion value in each points "+/-" switch (different screw positions).
Using a suitable Allen wrench, change the position of the cam guide blade; if you
screw it down, the flow rate is reduced; if you unscrew it, the flow rate increases.
WARNING: the variable profile of the cam shall have a normal proportional
curvature in order to have good combustion values and reduce its mechanical stress
breakdown.
Pressure switch adjustment
AIR PRESSURE SWITCH CALIBRATION
The air pressure switch is provided for monitoring the pressure of the combustion air fan.
Unscrew screws A and B and remove cover C.
After the air and gas setting you have to calibrate the air switch with the burner working
on the low flame by slowly turning the relative knob clockwise until the burner locks out.
Read the value and then decrease it by 15%.
Set the pressure switch to the minimum by turning knob D to position 1.
Start the burner and keep in low flame running, while checking that combustion is
correct. Through a small cardboard, progressively obstruct the air intake until to obtain a
CO2 increase of 0,5÷0,8% or else, if a pressure gauge is available, connected to
pressure port E, until reaching a pressure drop of 1 mbar (10 mm of W.G.).
Slowly increase the adjustment value of the air pressure switch until to have the burner
lockout. Remove the obstruction from the air intake, screw on the cover C and start the
burner by pressing the control box rearm button.
WARNING: the air pressure switch shall prevent the air pressure to go below 80% from
the adjustment value in order to prevent the CO in the fumes to exceed 1% (10000 ppm).
Using the analyser try to close the air inlet and check that the burner locks out before
exceeding CO value of 1% in the fumes.
MIN GAS PRESSURE SWITCH
The gas pressure switch has the function to check that the gas pressure before the gas
valve does have the minimum pressure to make the burner running correctly.
Unscrew off and remove cover M. - Set knob N to a value equal to 60% of gas nominal
feed pressure (i.e. for natural gas nom. pressure = 20 mbar, set knob to a value of 12
mbar; for LPG nom. pressure of G30/G31- 30/37 mbar, set knob to a value of 18 mbar).
MAX GAS PRESSURE SWITCH (KIT)
The maximum gas pressure switch has the function to check that the gas pressure after
the gas train and before the head does not exceed the pre-set limits.
Max gas pressure switch: it is available as a kit for different pressure.
Servomotor SQM50 - Final setting
22
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Once the point to point gas cam setting has been completed we need to set
the final minimum output of the burner using the servomotor cam IV (low flame gas).
Using the suitable key regulate the grades ("+/-" switch).
The low flame position must be higher than the ignition position cam on the servomotor.
Turn the burner off and start it again in order to check if the burner start properly
otherwise adjust the ignition gas cam number III.
GAS SETTING ENDED: switch the selector to automatic position.
!
WARNING: Do not use the button cam drum release button.
Point to point gas cam
configuration
C
A
B
Gas pressure switch
M
I
L
420010511800
- -
+
D
N
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