Table of Contents
Advertisement
7.3.4
MIN power
The MIN power must be chosen from within the working range
given on page 11.
Press the "-" button 2)(Fig. 20 at page 22) and keep it pressed
until the servomotor has reached 15° (factory setting).
Nozzle flow rate adjustment
The nozzle flow rate is given in diagram (Fig. 25 at page 23) cor-
responding to the pressure on the nozzle return read on the pres-
sure gauge 10)(Fig. 24 at page 23).
To vary the nozzle minimum flow rate, modify the initial profile of
the upper cam 7)(Fig. 24 at page 23) via the screws 8).
Adjusting air delivery
Modify the initial profile of the lower cam 4)(Fig. 24 at page 23)
via the screws 5) inside the opening 6).
If possible, do not rotate the first screw as this is the one that pro-
vides for total closure of the air shutter.
7.3.5
Intermediate power
Air/oil flow rate adjustment
Slightly press the "+" button 2)(Fig. 20 at page 22) so that a new
screw 5)(Fig. 24 at page 23) appears inside the opening 6).
Adjust screw 8) which varies the profile of the upper cam 7) and
the corresponding screw 5) which controls the lower cam 4) until
you obtain optimum combustion.
Proceed in the same way with the next screws except for the last
one, previously adjusted to obtain maximum power.
Ensure that variation of the cams profile is gradual.
7.4
Oil pressure switch
The oil pressure switch 14)(Fig. 29 at page 25) is factory set to 3
bar.
If the gas oil pressure reaches this value in the return piping, the
pressure switch stops the burner.
Burner starts again automatically if the pressure goes down un-
der 3 bar after burner shut down.
If a loope circuit (page 17) with Px pressure feeds the burner, the
pressure switch should be adjusted to Px + 3 bar.
20033316
Start-up, calibration and operation of the burner
Turn the burner off via switch 1)(Fig. 20 at page 22), OFF posi-
tion, release the cam with variable profile by setting the servomo-
tor notch 2)(Fig. 24 at page 23) to the vertical position and check
that the movement is smooth by manually rotating the cam back-
wards and forwards several times.
NOTE
Cams I - II - IV of the servomotor do not require adjustment.
Only cam III may need adjusting. In this case, remove the cover
1)(Fig. 27), which clicks in and out, take the key 2) out and insert
it in the notch on cam III.
The servomotor follows the adjustment of cam III only when the
cam angle is reduced.
If you need to increase the cam angle (15..16..17°..), first in-
crease the servomotor angle via the "+" button, then increase the
angle of cam III and finally reset the servomotor to the MIN power
position via the "-" button.
D793
24
GB
Fig. 27
Advertisement
Table of Contents
