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CALIBRATION OF MINIMUM GAS
PRESSURE SWITCH
The minimum gas pressure switch
ves to prevent the burner from being
started up or to shut it down. If the gas
pressure falls below the minimum
required level, this setting should be
40% lower than the gas pressure
obtained with the burner operating at
maximum delivery.
ADJUSTING THE COMBUSTION HEAD
It is possible to shift the combustion head (GAS 5) or the pressurisation ring (GAS 9 - JM 18)
forwards or rearwards by rotating the screw "D" on the lid.
N.B. The JM 12 version has no combustion head adjustment.
GAS 5
ser-
GAS 9
18
JM 18
GB
FIG. 12
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