C.I.B. UNIGAS - M039175CD
28
16 Turn the burner off, then start it up again.
17 Once the pre-purge time comes to end, drive the burner to the high flame stage by the
TAB
thermosta and check the combustion
values;
18 drive the burner to low flame, if necessary adjust the low flame size (ouput) by inserting a screwdriver on the slot
F
to move the
BF
cam.
19 The low flame position must never match the ignition position that is why cam
BF1
must be set 20°- 30° more than the ignition posi-
tion (see
ID
index on previous pictures).
20 Now adjust the pressure switches (see next parahraphs).
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.
Calibration of air and gas pressure switches ( Fig. 29- 2 - 5)
The
air pressure switch
locks the control box if the air pressure is not the one requested. If it happens,
unlock the burner by means of the control box unlock pushbutton, placed on the burner control panel.
The
gas pressure switches
check the pressure to avoid the burner operate when the pressure value is not
in the requested pressure range.
Calibration of air pressure switch
To calibrate the air pressure switch, proceed as follows:
z
Remove the transparent plastic cap.
z
Once air and gas setting have been accomplished, startup the burner.
z
During the pre-purge phase o the operation, turn slowly the adjusting ring nut
VR
in the clockwise direction (as to increase the adju-
sting pressure) until the burner lockout, then read the value on the pressure switch scale and set it to a value reduced by 15%.
z
Repeat the ignition cycle of the burner and check it runs properly.
z
Refit the transparent plastic cover on the pressure switch.
SC
SV
V
ID
V
SV
Gas throttle valve open
Gas throttle valve closed
BF
F
CMF
CMF = 0 stop at the current position
CMF = 1 high flame operation
CMF = 2 low flame operation
CMF = 3 automatic operation
VR
