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6.16
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. 4 on page 11),
after unscrewing the relative screw.
6.17
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
Cover the flame sensor
Make sure that the mechanical locking systems
on the various adjustment devices are fully tight-
ened.
ATTENTION
6.18
Monitoring system of the combustion head temperature
The burner is equipped with a temperature control device
23)(Fig. 5 on page 12, Fig. 41) which, by means of a thermocou-
ple, controls the temperature inside the combustion head to pre-
vent damage to the combustion head.
The outputs of the control device act directly on the "safety loop"
of the control box by locking-out the burner (LOC 22).
The control device locks out the control box in the following cas-
es:
–
the allowed temperature limit has been reached (factory set-
ting);
–
failure of the measurement circuit (thermocouple connec-
tion);
–
failure of the control device (or control device without ower
supply).
In case of lock-out:
check possible faults and anomalies on the temperature
control and on the relevant external fuse;
check the integrity of the thermocouple (for procedure see
"Opening the burner" on page 54);
check the integrity of the combustion head.
After the appropriate checks, proceed as follows to restore the
correct burner operation:
reset the alarm condition by pressing the button 1)(Fig. 42)
on the temperature control;
reset the lock-out condition on the control box.
20152087
Start-up, calibration and operation of the burner
There are now two possibilities:
–
using the operator panel according to the manual lockout pro-
cedure on page 37;
–
using the switch 0-1 of Fig. 32 on page 32.
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
1
1
50
GB
Tab. S
20152084
Fig. 41
20162839
Fig. 42
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