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6.10.4 Minimum oil pressure switch
The minimum oil pressure switch (Fig. 38) is calibrated in the fac-
tory at 18 bar.
If during the start-up phase the oil pressure drop or does not
reach 18 bar, the burner goes to the ignition phase and the dis-
charge of the transformer remains for 30s without opening the oil
valve, after which there is a lockout and the display shows "Loc c
20 d0".
If during the flame the oil pressure drops below 18 bar, the burner
goes into lockout.
6.10.5 Maximum oil pressure switch
The maximum oil pressure switch (Fig. 38) is calibrated in the
factory at 3 bar.
If during the ignition phase the oil pressure in the return line goes
over 3 bar, the burner locks out.
if during the flame the oil pressure in the return line goes over 3
bar, the burner goes into lockout.
6.11
Operation
Once the start-up cycle is completed, the servomotor command
moves on to the thermostat/pressure switch that controls the
pressure or the temperature in the boiler.
If the temperature or the pressure is low, the burner progres-
sively increases the output as far as the MAX value.
If the temperature or the pressure increases, the burner pro-
gressively reduces the output as far as the MIN value. The
sequence repeats endlessly.
6.12
Ignition failure
If the burner does not switch on, there is a lockout within 3s of the
electrical supply reaching the fuel valve.
It may be that the fuel does not arrive at the combustion head
within the safety time of 3s.
In this case increase fuel ignition flow rate.
In the event the burner stops, in order to prevent
any damage to the installation, do not unblock the
burner more than twice in a row.
WARNING
If the burner locks out for a third time, contact the
customer service.
6.13
Burner flame goes out during operation
If the flame accidentally goes out while running, the burner goes
into lockout within 1 second.
6.14
Stopping of the burner
The burner can be stopped by:
intervening on the disconnecting switch of the electrical sup-
ply line, located on the boiler panel;
using the "0-AUTO" switch of Fig. 32 on page 35.
Make sure that the mechanical locking systems
on the various adjustment devices are fully tight-
ened.
WARNING
20182649
Start-up, calibration and operation of the burner
20079898
The burner stops when the heat request is less than the heat
supplied by the burner at MIN output.
The thermostat/pressure switch TL opens, the control box
carries out the switching off phase.
The air damper closes completely to reduce heat losses to a
minimum.
In the event there are further lockouts or faults
with the burner, the maintenance interventions
must only be carried out by qualified, authorised
personnel, in accordance with the contents of this
DANGER
manual and in compliance with the standards and
regulations of current laws.
40
GB
Fig. 38
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