Riello RS 280 - Final Calibration of the Pressure Switches; Air Pressure Switch; Maximum Gas Pressure Switch; Minimum Gas Pressure Switch

Start-up, calibration and operation of the burner
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5.7 Final calibration of the pressure switches
5.7.1 Air pressure switch
For the RS 280 model, the air pressure switch is connected in dif-
ferential mode and is activated by both the negative pressure of the
air intake and the positive pressure from the fan.
For the RS 310-410-510 models, the air pressure switch is con-
nected in absolute mode and is activated by the positive pressure
from the fan (Fig. 30).
Adjust the air pressure switch (Fig. 30) after having performed all
other burner adjustments with the air pressure switch set to the
min. of the scale.
With the burner operating at low fire, adjust the pressure switch by
slowly turning the relative knob clockwise until the burner locks out.
Then turn the knob counter-clockwise about 20% of the set point
and start-up the burner again to ensure the set point is correct.
If the burner locks out again, turn the knob counter-clockwise a little
bit more.
5.7.2 Maximum gas pressure switch
Adjust the maximum gas pressure switch after having performed all
other burner adjustments with the maximum gas pressure switch
set to the end of the scale (Fig. 31).
With the burner operating at MAX output, reduce the adjustment
pressure by slowly turning the adjustment dial anticlockwise until
the burner locks out.
Then turn the dial clockwise by 0.8” WC and repeat burner firing.
If the burner locks out again, turn the dial again clockwise by
0.4” WC.
5.7.3 Minimum gas pressure switch
Adjust the minimum gas pressure switch after having performed all
the other burner adjustments with the pressure switch set at the
start of the scale (Fig. 32).
With the burner operating at MAX output, increase adjustment
pressure by slowly turning the relative dial clockwise until the burn-
er locks out.
Then turn the dial anti-clockwise by 0.8” WC and repeat burner
starting to ensure it is uniform.
If the burner locks out again, turn the dial anti-clockwise again by
0.4” WC.
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+
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+
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Fig. 30
D3951
Connection of the pressure gauge with
the pressure switch in absolute mode
or differential mode for RS 280
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Fig. 31
D9272
Fig. 32
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