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If the air pressure switch does not detect a pressure greater than that
calibrated, the equipment runs through its cycle but does not switch
on the ignition transformer and does not open the gas valves and so
the burner “locks-out”.
To ensure the air pressure switch correct operation, with burner at
the minimum output, increase the adjustment value until reaching
the triggering value which must be followed by the immediate burner
lock-out.
To ensure correct operation of the air pressure switch you must, with
burner on and in 1st stage, increase its regulation value until the
burner triggers and then it immediately “locks-out”.
To unblock the burner, press the special pushbutton and return the
pressure switch regulator to a sufficient value in order to measure the
air pressure existing during the pre-ventilation phase.
The gas pressure control switches (minimum and maximum) prevent
the burner from operating when gas pressure does not lie between
the expected range.
Adjustment of minimum and maximum pressure values on the
pressure switches must be performed when testing the burner, on the
basis of the pressure measured in each case.
The triggering (opening of the circuit) of any of the pressure switches
when the burner is running (flame on) causes the burner to stop
immediately.
When first switching on the burner it is essential to check that they
work properly.
This test should also be conducted with the burner already on. The
apparatus should shut down immediately when the ionisation cable
is disconnected.
Verify the flame detector operation as follows:
• disconnect the wire coming from the ionisation electrode;
• start the burner;
• the equipment will complete the control cycle and after two seconds
will lock out the burner due to the lack of ignition flame;
• switch off the burner;
• re-connect the wire to the ionisation electrode.
• This test should also be conducted with the burner already on;
when extracting the photocell from its seat, the apparatus should
shut down immediately.
•
check the efficiency of the thermostats or boiler pressure switches
(they should shut down the burner when triggered)
•
Check the efficiency of the thermostats or boiler pressure switches
(they should shut down the burner when triggered).
CAUTION / WARNINGS
Check that the ignition takes place properly. If the passage
between the head and the disk is closed, the speed of the
(air/fuel) mix may be so high that ignition is difficult. Open the
gas valve speed regulator (if fitted) bit by bit to a position in
which ignition takes place correctly, and accept this as the final
position.
IONISATION CURRENT
The maximum ionisation current value required for a correct operation
of the equipment is indicated in the wiring diagram.
To measure ionisation current, connect a microammeter in series with
the ionisation electrode cable as shown in the figure.
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