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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 (Fig. 35) after making all
other burner adjustments with the maximum gas pressure switch
set to the end of the scale.
To calibrate the maximum gas pressure switch, open the tap and
then connect a pressure gauge to its pressure test point.
The maximum gas pressure switch must be regulated to a value no
higher than 30% of the measurement read on the gauge when the
burner is working at maximum output.
After making the adjustment, remove the pressure gauge and close
the tap.
20106891
Start-up, calibration and operation of the burner
38
+
-
20125202
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Connection of the pressure gauge with the
pressure switch in absolute mode or differential
mode for RLS 280
D3856
GB
D3951
+
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Fig. 34
PA
20181543
PGM
Fig. 35
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