M039150CF
31
z
Siemens actuator: set the MAN/AUTO lever to MAN to move the cams, rememeber to set it to AUTO once the adjustment
is accomplished.
Adjustment procedure for gas operation
1
set GAS fuel by means of the burner
CM
switch (it is placed on the burner control panel - see page 36)
2
check the fan motor rotation (see pag. 23).
Only for burners provided with
Dungs Multibloc MB-DLE gas valves
:before starting the burner up, adjust the valves slow opening. To
set the fast opening remove cover
T
, reverse it upside down and use it as a tool to rotate screw
VR
. Clockwise rotation reduces start
flow rate, anticlockwise rotation increases it. Do not use a screwdriver on the screw
VR
! The pressure stabilizer is adjusted by operating
the screw
VS
located under the cover
C
. By screwing down the pressure is increased and by unscrewing it is reduced.
Note:
the screw
VSB
must be removed only in case of replacemente of the coil.
Only for burners provided with
Dungs Multibloc MB-DLE gas valves
:before starting the burner up, adjust the valves slow opening. To
set the fast opening remove cover
T
, reverse it upside down and use it as a tool to rotate screw
VR
. Clockwise rotation reduces start
flow rate, anticlockwise rotation increases it. Do not use a screwdriver on the screw
VR
! The pressure stabilizer is adjusted by operating
the screw
VS
located under the cover
C
. By screwing down the pressure is increased and by unscrewing it is reduced.
Note:
the screw
VSB
must be removed only in case of replacemente of the coil.
3
Start the burner up by means of the thermostat series and wait until the pre-purge time comes to an end and that the burner starts
up;
4
drive the burner to high flame stage, by means fo the thermostat
TAB
.
5
do not change the air flow rate adjustment set in the light oil operation (see previous paragraph);
6
acting on the pressure stabiliser of the valves group, adjust the
gas flow rate in the high flame stage
as to meet the values
requested by the boiler/utilisation:
-
Multibloc MB-DLE:
the valve is adjusted by means of the
RP
regulator after slackening the locking screw
VB
by a number of
turns. By unscrewing the regulator
RP
the valve opens, screwing the valve closes.
- Siemens VGD valves group:
remove cap
T
and act on the
VR
adjusting screw to increase or decrease the pressure and consequently the gas rate; screwind
VR
the rate incre-
ases, unscrewing it decreases (see next figure).
Berger STA12 B 3.41
Siemens SQN72
ST2 = High flame cam
ST0 = Ignition position
ST1 = Low flame
MV = Auxiliary cam for the second valve enabling
I = High flame cam (red)
II = Ignition position (blue)
III = Low flame (orange))
IV = Auxiliary cam for the second valve enabling (black)
MV
ST2
ST1
ST0
III
II
I
AUTO-MAN
VR
T
Siemens VGD..
C
VS
T(VR)
VB
VSB
Dungs Multibloc MB-DLE
RP
Fig. 30
