Ignition Pilot Burner; Pressure Switch Adjustment; Air Pressure Switch; Oil Pressure Switch - Riello DB 12 LM C10 Installation, Use And Maintenance Instructions

5.7

Ignition pilot burner

For correct functioning, adjust the gas pressure as shown in
Tab. I.
Gas
G31
Check pilot flame stability before starting up the
main burner.
WARNING
Continue with the ignition of the burner making sure the pilot has
ignited properly.
5.8

Pressure switch adjustment

5.8.1

Air pressure switch

Adjust the air pressure switch after performing all other burner
adjustments with the air pressure switch set to the start of the
scale (Fig. 28).
With the burner operating at MAX. output, increase adjustment
pressure by slowly turning the relative knob clockwise until the
burner locks out.
Then turn the knob anti-clockwise by about 20% of the adjusted
value and
check the burner starts up correctly. If the burner locks out again,
turn the knob anti-clockwise a little bit more.
In conformity with current standards, the air pres-
sure switch must prevent the CO in the flue gases
exceeding 1% (10,000 ppm).
WARNING
5.8.2

Oil pressure switch

Check that the oil pressure switches have intervened correctly.
Turn the adjustment screw (Fig. 29) to check that the pressure
switches have intervened. The check should be carried out by in-
dividually varying the calibration of each pressure switch.
Decreasing the maximum calibration of the oil pressure switch,
the burner should go into lockout.
Increasing the minimum calibration of the oil pressure switch, the
burner should not start.
The minimum oil pressure switch must be calibrated to approx.
16-18 bar.
With the control completed, reset the factory calibration of the
maximum oil pressure switch to approx. 4-5 bar.
Any other pressure values should be adjusted to the burner out-
put.
Start-up, calibration and operation of the burner
3
mbar Sm /h
1.4 3.2
Tab. I
D8061
20079898
25 GB
D3854
Fig. 29
Fig. 27
Fig. 28
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