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11 in order to get the maximum oil flow rate, adjust the pressure (reading its value on the oil pressure gauge (Fig. 31): checking always the
combustion parameters, the adjustment is to be performed by means of the SV adjusting cam screw V (Fig. 33) when the cam has rea-
ched the high flame position.
12 The atomising air flow rate and pressure can be adjusted with the VA screw (Fig. 28). Too low a pressure produces poor atomising
with smoke in the flue. Too high a pressure produces instability and the flame can be cut off.
13 To adjust the comburent 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.
14 If necessary, change the combustion head position: to let the burner operate at a lower output, move progressively back the com-
bustion head towards the MIN position, by turning clockwise the VRT ring nut. The graduated index ID shows the combustion head
shifting (each mark refers to 5mm).
VRT
ID
Attention! if it is necessary to change the head position, repeat the air and gas adjustments described above.
15 as for the point-to-point regulation in order to set the cam foil shape, move the low flame microswitch (cam III) a little lower than the
maximum position (90°);
16 set the TAB thermostat to the minimum in order that the actuator moves progressively towards the low flame position;
17 move cam III towards the minimum to make the actuator move towards the low flame until the two bearings find the adjusting screw
that refers to a lower position: screw V to increase the rate, unscrew to decrease, in order to get the pressure as showed on dia-
gram on , according to the requested rate.
18 Move again cam III towards the minimum to meet the next screw on the adjusting cam and repeat the previous step; go on this way
as to reach the desired low flame point.
19 The low flame position must never match the ignition position that is why cam III must be set 20°- 30° more than the ignition posi-
tion.
Turn the burner off; then start it up again. If the adjustment is not correct, repeat the previous steps.
Calibration of air pressure switch
To calibrate the air pressure switch, proceed as follows:
Remove the transparent plastic cap.
Once air and heavy oil setting have been accomplished, startup the burner.
During the pre-purge phase o the operation, turn slowly the adjusting ring nut VR in the
clockwise direction until the burner lockout, then read the value on the pressure switch
scale and set it to a value reduced by 15%.
Repeat the ignition cycle of the burner and check it runs properly.
Refit the transparent plastic cover on the pressure switch.
C.I.B. UNIGAS - M039126CE
TR
RA
VRA
30
"MAX" position
VR
"MIN" position
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