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5
Preparation for start up
5.1
Combustion head setting (Fig. 16)
The servomotor 3) Fig. 2 varies the air flow depending on the output
requested and manually also the setting of the combustion head. This sys-
tem allows an optimal setting even at a minimum firing rate.
For the same servomotor rotation, combustion head opening can be varied
by moving the lever onto holes 1-2-3-4-5-6, Fig. 16, after loosening the
screw 1).
The choice of the hole (1-2-3-4-5-6) to be used is decided on the basis of
diagram (Fig. 17) against the required maximum output. Setting is pre-
arranged in the plant for the maximum run (hole 3). When dealing with boil-
ers featuring a strong back pressure, if air delivery is insufficient even with
the damper fully open, you can use a different setting to that illustrated in
diagram (Fig. 17) - do this by moving the tie rod onto the next highest hole
numerically speaking, thus increasing the combustion head's opening and
hence air delivery
For operation on flame-reversal boilers, gas pipes must be adjusted to hole position 4.
20064735
D3109
DB3
DB4-6
Fig. 17
Fig. 16
13
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