Final Calibration Of The Pressure Switches; Air Pressure Switch; Maximum Gas Pressure Switch - Riello RLS 280/E Installation, Use And Maintenance Instructions

5.8

Final calibration of the pressure switches

5.8.1

Air pressure switch

For the RLS 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 RLS 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. 34).
Adjust the air pressure switch (Fig. 34) 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.
5.8.2

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. 35).
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.
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Start-up, calibration and operation of the burner
38
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20125202
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Connection of the pressure gauge with the
pressure switch in absolute mode or differential
mode for RLS 280
GB
D3951
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Fig. 34
Fig. 35
D9272