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5.7
Air pressure switch
The air pressure switch is connected in differential (Fig. 33) and is
activated by both the negative pressure of the air intake and the air
pressure from the fan.
Adjust the air pressure switch (Fig. 29) 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
Flame signal measurement
Check the flame signal through the parameter 954, as indicated in
Fig. 34. The displayed value is expressed in percentage.
For further and specific information, please refer to the specific in-
struction manual.
The value during the operation must be higher than 24%. If at the
burner start-up the value is higher or equal of 18%, the burner locks
out due to the extraneous light.
The display (Fig. 34) shows parameter 954 : flashing on the left. On
the right, the flame's intensity is displayed as a percentage.
Example: 954: 0.0
5.9
Final checks (with the burner working)
➤ Open the control limit operation
➤ Open the high limit operation
➤ Rotate the maximum gas pressure switch knob to the mini-
mum end-of-scale position (if installed)
➤ Rotate the air pressure switch knob to the maximum end of
scale position
➤ Switch off the burner and disconnect the voltage
➤ Rotate the minimum gas pressure switch
➤ Regulate the minimum oil pressure switch
➤ Cover the UV flame sensor
Make sure that the mechanical locking systems on
the different adjustment devices are fully tightened.
WARNING
20027066
Start-up, calibration and operation of the burner
30
20049408
S8171
➮
The burner must stop
➮
The burner must stop in lockout
➮
The burner must not start
➮
The burner must stop in lockout due to firing failure
GB
P
V
h min s
%
Fig. 33
Fig. 34
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