M039150CF
32
Pressure stabiliser is factory-set. The setting values must be locally adapted to machine conditions. Important! Follow the instruc-
tions carefully!
7
The burner is factory-set with the head in its MAX position (maximum output). To let the burner operate at a lower output, turn
clockwise the
VRT
screw and move progressively the combustion head back towards the MIN position.
Attention!
if it is necessary
to change the head position, repeat the air and gas adjustments described above.
8
drive the burner to the low flame stage by means of the
TAB
thermostat;
In order to change the gas flow rate slacken the nuts
DB
(Fig. 31) and adjust the opening angle of the gas butterfly valve by rotating the
rod
TG
(clockwise rotation increases gas flow, anticlockwise rotation decreases it). The mark on the butterfly valve shaft shows the
measured opening degree of the valve regardingthe horizontal axis (Fig. 31).
NOTE:
At the end of settings, make sure the locking
screws
RA
and
DB
are fully tightened.
Fig. 31
9
Now adjust the pressure switches (see pag. 33).
10 In the case that the flue gas temperature is not the one required, go back to the light oil operation and adjust the oil flow rate as to
meet the flue gas temperature values reqested. Consequently adjust the air always observing the combustion analysis. Then go
back to the gas operation and repeat only the gas adjustments (because the air rate has already been set in the light oil operation);
always check the combustion values.
11 Turn the burner off and then start it up again. If the adjustment is not correct, repeat the previous steps.
“MAX” head position
“MIN” head position“MIN” head
VRT
TG
DB
