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6
6-9
Adjustments
6 .9 .1
Primary air adjustment
Primary air must be adjusted as explained in par. Burner and nozzle specifications and adjustments
depending on the type of gas used on page 35 . Primary air is adjusted correctly if flame stability is
guaranteed. In other words, there is no flame gap when the burner is cold and there is no blow-back
(ignition of the gas at the nozzle) when the burner is hot.
6 .9 .2
Pilot flame adjustment
Adjust and check that the flame wraps around the thermocouple and that its appearance is correct.
For further explanation, we provide a brief description of the characteristics and behaviour of the gas on
the basis of the gas-air ratio. Below we illustrate the characteristics of a flame, when air adjustment in the
burner is excessive, lacking or correct.
Fig. 21 Pilot flame adjustment
A. Too much air in flame - Light blue flame. The flame tends to separate (blowing) or to return (blow-
back) with possible ignition at the nozzle. Usually, with methane and liquefied gases, flames tend to blow.
B. Too little air in flame - Flame with yellow peak. Production of harmful carbon monoxide with a
subsequent depositing of black soot on the bottom of pans. Very poor burner performance.
C. Correct flame - Blue or dark blue flame. Maximum burner performance; if this does not occur, check
that the nozzles fitted are the correct ones - for this purpose, see par. Burner and nozzle specifications
and adjustments depending on the type of gas used on page 35.
DANGER
Carbon monoxide is an odourless, colourless and toxic gas and is lethal even at very low
concentrations .
46
Instructions for qualified fitters
A
GAS PASTA COOKER - LADY 900
B
© Copyright 2015
C
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