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8.8
Combustion head setting
To adjust the combustion head, proceed as follows:
loosen the two screws in the ring slots.
Turn the blast tube to regulate it, until the end of the slotted
ring centres up with the notch shown in the Tab. H on
page 20.
Turn in a clockwise direction:
in order to increase the volume of air entering the combus-
tion chamber and thus diminishing its pressure.
There is a reduction of CO2 and the adhesion of the flame to
the air diffuser disc improves.
(Setting advisable for ignitions at low temperatures).
Turn in an anticlockwise direction:
in order to reduce the volume of air entering the combustion
chamber and thus increasing its pressure.
The CO2 improves and the adhesion of the flame to the dif-
fuser tends to reduce.
(This setting is not advisable for ignitions at low tempera-
tures).
Tighten the two screws.
8.9
Normal operation burner start-up cycle
Normal
Thermostat
Motor
Ignition transformer
Valve
Flame
Lock-out lamp
Lock out is indicated by a lamp on the control box (5, Fig. 1 on
page 9).
20158125
Start-up, calibration and operation of the burner
~ 12s
D4268
Lock-out due to failure to light
~ 12s
22
GB
Slotted ring
Screw
0
Shutter
Screw
Blast tube
~ 5s
Fig. 20
D5229
Fig. 21
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