C.I.B. UNIGAS
- M03956CR
23
P73A
The burner is factory-set wih the adjusting plate holes fully open, and the combustion head at its MAX position, so it is fit to work at the
maximum output.
To adjust the gas flow, partially close the holes, as follows:
1
loosen the three
V
screws that fix the adjusting plate
D
;
2
insert a screwdriver on the adjusting plate notches and let it move CW/CCW as to open/close the holes;
3
once the adjustmet is performed, fasten the
V
screws.
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!
Change the combustion head position only if necessary. If so, repeat the air and gas adjustments described above.
DUNGS MB-DLE gas valves group:
Before starting the burner up, adjust the valves group slow opening: to set the slow opening
remove cover
T
, reverse it upside down and use it as a toolto rotate screw
VR
. Decrease the ignition flow rate by screwing, increase it
by unscrewing. Do not use a screwdriver on the screw
VR
!
Note: the screw
VSB
must be removed only in case of replacemente of the coil (see picture on page 24).
On the
DUNGS MBC..SE gas valves group,
set the pressure regulator to 1/3 of its stroke, using a 2.5 allen key.
1
Turn the burner on by means of its main switch
A
: if the burner locks (LED
B
on in the control panel) press the RESET button (
C
)
on the control panel (Fig. 25). See chapter “Operation” for further details.
2
check the fan motor rotation (see “Rotation of fan motor” on page 19)
3
Start the burner up by means of the thermostat series and wait unitl the pre-purge phase comes to end and that burner starts up;
4
the burner starts up in the low flame stage: drive the burner to high flame stage, by means of the “high/low flame” thermostat
TAB
.
5
adjust the burner combustion values in the high flame stage as described in the following steps.
6
go on adjusting air and gas flow rates: check, continuosly, the flue gas analisys, as to avoid combustion with little air; dose the air
according to the gas flow rate change following the steps quoted below;
7
acting on the pressure governor of the valves group, adjust the
gas flow rate in the high flame stage
as to meet the values
requested by the boiler/utilisation:
CAUTION:
perform these adjustments once the burner is turned off and cooled.
V
D
closed holes
open holes
VRT
VB
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Pressure setting
