Riello RS 25/E BLU Series, Инструкции по установке, использованию и обслуживанию

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33 20068118
GB
Start-up, calibration and operation of the burner
6.5 Final calibration of the pressure switches
6.5.1 Air pressure switch
Adjust the air pressure switch (Fig. 33) 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 oper-
ations it may be useful to measure the air pressure with a pres-
sure gauge.
The connection of the pressure gauge is shown in Fig. 33.
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 differ-
ential 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. 33.
6.5.2 Minimum gas pressure switch
Adjust the minimum gas pressure switch (Fig. 34) after having
performed all other burner adjustments with the pressure switch
set to the start of the scale.
With the burner operating at maximum output, increase adjust-
ment pressure by slowly turning the relative knob clockwise until
the burner locks out.
Then turn the knob anticlockwise by 2 mbar and repeat the burner
start-up to ensure it is regular.
If the burner locks out again, turn the knob anticlockwise again by
1 mbar.
6.5.3 PVP pressure switch kit
Adjust the pressure switch for the valve leak detection control de-
vice (PVP Kit)(Fig. 35), if present, according to the instructions
supplied with the Kit itself.
WARNING
1 kPa = 10 mbar
Fig. 33
Connecting the
pressure gauge
with the pressure
switch in differen-
tial mode
D8003
D3951
Connecting the
pressure gauge
with the pressure
switch in abso-
lute mode
Fig. 34
D3855
Fig. 35
D3855