Riello 20171510, Инструкции по установке, использованию и обслуживанию

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27 20171652 GB
Start-up, calibration and operation of the burner
5.3 Burner start-up
Feed electricity to the burner via the disconnecting switch on the
boiler panel.
Close the thermostats/pressure switches and turn the switch
4)(Fig. 6 on page 11) to position “
ON ”.
As the burner is not fitted with a device to check the sequence of
the phases, the motor rotation may be incorrect.
As soon as the burner starts up, go in front of the cooling fan of
the fan motor and check it is rotating anticlockwise. See Fig. 29.
If this is not the case:
–
place the switch 4)(Fig. 6 on page 11) in position “ OFF ” and
wait for the control box to carry out the switch-off phase;
– disconnect the burner from the electrical supply;
– Invert the phases on the three-phase power supply.
5.4 Final calibration of the pressure switches
5.4.1 Air pressure switch
Adjust the air pressure switch (Fig. 30) after having performed all
other burner adjustments with the air pressure switch set to the
start of the scale.
With the burner working at MIN output, insert a combustion
analyser in the stack, slowly close the suction inlet of the fan (for
example, with a piece of cardboard) until the CO value does not
exceed 100 ppm.
Slowly turn the appropriate knob clockwise until the burner goes
into lockout.
Check the indication of the arrow pointing upwards on the gradu-
ated scale. Turn the knob clockwise again, until the value shown
on the graduated scale corresponds with the arrow pointing
downwards, and so recovering the hysteresis of the pressure
switch (shown by the white mark on a blue background, between
the two arrows).
Now check the correct start-up of the burner. If the burner locks
out again, turn the knob slightly anticlockwise. During these op-
erations it may be useful to measure the air pressure with a pres-
sure gauge.
The connection of the pressure gauge is shown in Fig. 30.
The standard configuration is that with the air pressure switch
connected in absolute mode. Note the presence of a “T” connec-
tion, not supplied.
In certain applications in strong depression situations, the con-
nection of the pressure switch does not allow it to change over.
In this case it is necessary to connect the pressure switch in dif-
ferential mode, applying a second tube between the air pressure
switch and the fan suction line mouth.
In this case also, the pressure gauge must be connected in differ-
ential mode, as shown in Fig. 30.
DANGER
Make sure that the lamps or testers connected to
the solenoids, or indicator lights on the solenoids
themselves, show that no voltage is present.
If voltage is present, stop the burner immediately
and check the electrical wiring
Fig. 29
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+
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Fig. 30
D3951
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Connecting the pressure gauge
with the pressure switch in
differential mode
Connecting the pressure gauge
with the pressure switch in
absolute mode