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Start-up, calibration and operation of the burner
5.1 Notes on safety for the first start-up
5.2 Burner firing
Having completed the checks indicated in the previous heading,
the pilot of the burner should fire.
If the motor starts but the flame does not appear and the flame
safeguard goes into lock-out, reset and wait for a new firing at-
tempt.
Pilot adjustment has been illustrated on Fig. 19, page 20.
Having adjusted the pilot, reconnect the main valve and ignite the
main flame; it might require several attempts to purge the air from
the gas lines or to adjust the valve with little gas.
Once the burner has fired, now proceed with calibration operations.
5.3 Burner calibration
The optimum calibration of the burner requires an analysis of the
flue gases at the boiler outlet.
Adjust successively:
Firing output
Maximum burner output
Minimum burner output
Intermediate outputs between low and high fire
Air pressure switch
Minimum gas pressure switch
5.4 Adjustments before first firing
Adjustment of the combustion head has been illustrated on
page 20.
In addition, the following adjustments must also be made:
Open manual valves up-stream from the gas train.
Purge the air from the gas line.
Adjust the low gas pressure switch to the start of the scale
(Fig. 43).
Adjust the high gas pressure switch to the upper limit of the
scale (Fig. 42).
Adjust the air pressure switch to the zero position of the scale
(Fig. 41).
Fit a U-type manometer (Fig. 38) to the gas pressure test point
on the sleeve.
The manometer readings are used to calculate MAX. burner
power using the diagrams on page 25.
Before starting up the burner it is good practice to adjust the gas
train so that ignition takes place in conditions of maximum safety,
i.e. with gas delivery at the minimum.
5 Start-up, calibration and operation of the burner
The first start-up of the burner must be carried out
by qualified personnel, as indicated in this manual
and in compliance with the standards and regula-
tions of the laws in force.
Check the correct working of the adjustment, com-
mand and safety devices.
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