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7.6
Motor lockout
If the motor does not start, it could be because of a thermal relay
intervention due to its incorrect calibration or problems with the
motor or the main power supply, to release press the button of the
thermal relay, see "Calibration of the thermal relay" on page 19.
7.7
Ignition failure
If the burner does not switch on, there is a lockout within 3s of the
electrical supply reaching the gas valve.
It may be that the gas does not arrive at the combustion head
within the safety time of 3s.
In this case increase gas ignition flow rate. The arrival of gas to
the pipe coupling is displayed on the pressure gauge, as shown
in (Fig. 35 on page 51).
7.8
Burner flame goes out during operation
If the flame should go out during operation, the burner will lockout
within 1 s.
7.9
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;
removing the transparent protection 30) Fig. 5 on page 12,
after unscrewing the relative screw.
7.10
Final checks (with burner operating)
Open the thermostat/pressure switch TL
Open the thermostat/pressure switch TS
Turn the gas maximum pressure switch knob to the mini-
mum end of scale position
Turn the air pressure switch knob to the maximum end of
scale position
Turn off the burner and cut off the power
Disconnect the minimum gas pressure switch connector
Disconnect the connector of the ionisation probe
Make sure that the mechanical locking systems
on the various adjustment devices are fully tight-
ened.
WARNING
Control and display
WARNING
DANGER
There are now two possibilities:
–
using the operator panel according to the manual lockout pro-
cedure on page 35;
–
using the switch 0-1 of Fig. 26 on page 29.
The burner must stop
The burner must stop in lockout
The burner must not start
The burner must stop in lockout due to ignition failure
49
GB
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.
If the burner locks out for a third time, contact the
customer service.
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
manual and in compliance with the standards and
regulations of current laws.
Tab. P
20205048
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