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The air pressure switch prevents the opening of the gas valves
if the air pressure is not the foreseen one. The pressure switch
must be adjusted to intervene closing the contact when the
air pressure in the burner reaches a sufficient value. 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 correct
operation of the air pressure switch, with burner on and with
minimum flame, increase the regulation value until the pressure
switch is triggered and it immediately locks-out the burner.
Adjust the pressure switch to a level slightly below the actual
air pressure detected in minimum flame operation. Reset the
burner and check that it ignites correctly.
0002939600
The gas pressure control switches (minimum and maximum)
prevent the burner from operating when gas pressure does not lie
between the expected range.
The minimum value pressure switch makes use of the NO
(normally open) contact which is closed when the pressure switch
detects a pressure higher than its own setting.
The maximum pressure switch makes use of the NC (normally
closed) contact which is closed when the pressure switch detects
a pressure lower than its own setting.
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.
REGULATION BEFORE IGNITING THE BURNER:
regulate the pressure switch for minimum pressure at the minimum
value of the scale, regulate the pressure switch for the maximum
value at the maximum value of the scale.
REGULATION AFTER THE BURNER CALIBRATION:
With the burner running at maximum power, regulate the pressure
switch for minimum pressure by increasing the regulation value
until the burner shuts down, read the value on the regulation
ferrule and set it to a value diminished by 5 mbar.
With the burner running at maximum power, regulate the pressure
switch for maximum pressure, diminishing the regulation value
until the NC (normally closed) contact opens. Read the value on
the regulation ring and set it to a value increased by 5 mbar.
The pressure switches are connected so that, the operation (i.e.
opening of the circuit) of one of the switches makes the burner
shut down immediately if it is working (flame lit).
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