26
9
manually drive the adjusting cam
SV
to the high flame position and set the actuator to the AUTO mode (by the related switch - see
picture) to lock the adjusting cam.
10 the nozzle supply pressureis already factory-set and must not be changed. Only if necessary, adjust the supply pressure as fol-
lows (see related paragraph);insert a pressure gauge into the port shown on Fig. 21 and act on on the pump adjusting screw
VR
(see Fig. 25) as to get the nozzle pressure at 25bar (Fluidics nozzles - see diagram on page 20).
11 in order to get the maximum oil flow rate, adjust the pressure (reading its value on the
PG
pressure gauge) without changing the air
flow rate set during the gas operation adjustments (see prevoius paragraph): checking always the combustion parameters, the
adjustment is to be performed by means of the
SV
adjusting cam screw (see picture) when the cam has reached the high flame
position.
12 To adjust the
air flow rate in the high flame stage
, loose the
RA
nut and screw
VRA
as to get the desired air flow rate: moving
the rod
TR
towards the air damper shaft, the air damper opens and consequently the air flow rate increases, moving it far from the
shaft the air damper closes and the air flow rate decreases.
Note:
once the procedure is perfomed, be sure that the blocking nut
RA
is fasten. Do not change the position of the air damper
rods.
13 Only if necessary, change the combusiton head position: to let the burner operate at a lower output, loose the
VB
screw and move
progressively back the combustion head towards the MIN position, by turning clockwise the
VRT
ring nut. Fasten
VB
screw when
the adjustment is accomplished.
Attention!
if it is necessary to change the head position, repeat the air and oil adjustments described above.
14 once the air and oil flow rate have been adjusted at the maximum output, go on with the point to point adjustment on the
SV
adju-
Fig. 26
Fig. 27
Pressure gauge port
RP
PG
V
SV
VRA
RA
TR
”MIN” position
”MAX” position
VB
VRT
