38
Adjusting the combustion head
The burner is adjusted in the factory with the combustion head in the position that refers to the "MAX" output. The maximum output set-
ting refers to the “fully-ahead” position of the combustion head, as far as standard models (Fig. 44), and to “fully-backward” position for
low NOx burners (Fig. 45). As for “fully-ahead” position, it means that the head is placed inside the boiler, “fully-backward” position
means that the head is towards the operator. As far as the reduced output operation, progressively move the combusiton head
towards the “MIN” position, rotating clockwise the
VRT
screw (Fig. 43). The
ID
index shows how much the combustion head moved.
Fully modulating burners
To adjust the fully-modulating burners, use the
CMF
switch on the burner control panel (see next picture), instead of the
TAB
thermo-
stat as described on the previous paragraphs about the progressive burners. Go on adjusting the burner as described before, paying
attention to use the CMF switch intead of
TAB
.
The
CMF
position sets the oprating stages: to drive the burner to the high-flame stage, set CMF=1; to drive it to the low-flame stage, set
CMF=2.
To move the adjusting cam set CMF=1 or 2 and then CMF=0.
CMF = 0 stop at the current position
CMF = 1 high flame operation
CMF = 2 low flame operation
CMF = 3 automatic operation
As for the RWF setting, please refer to the related documentation.
Fig. 44 - Head in “fully-ahead position”
Fig. 45 - Head in “fully-backward position”
VRT
Fig. 43
ID