C.I.B. UNIGAS - M039175CD
24
Air and Gas Flow Rate Settings by means of Berger STM30../Siemens SQM40.. actuator
1
Check the fan motor rotation and act directly on the related contactor (see next picture).
2
Before starting the burner up, drive the high flame actuator microswitch matching the low flame one (in order to let the burner ope-
rates at the lowest output) to safely achieve the high flame stage.
3
Turn the burner on by means of its main switch
A
(see next picture): if the burner locks (LED
B
on in the control panel) press the
RESET button (
C
) on the control panel - see chapter “OPERATION”.
4
Start the burner up by means of the thermostat series and wait until the pre-purge time comes to an end and the burner starts up;
5
drive the burner to high flame stage, by means fo the thermostat
TAB
(high/low flame thermostat - see Wiring diagrams), as far as
fully-modulating burners, see related paragraph.
6
Then move progressively the microswitch to higher values until it reaches the high flame position; always check the combustion
values and eventually adjusting the gas by means of the valves group stabiliser.
7
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;
8
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:
- Siemens VGD valves group:
remove cap
T
and act on the
VR
adjusting screw to increase or decrease the pressure and conse-
quently the gas rate; screwind
VR
the rate increases, unscrewing it decreases (see next figure).
- Dungs MBC..SE valves group:
act on its pressure governor to increase or decrease the pressure and consequently the gas
rate.
Berger STM30
Siemens SQM40
Actuator cams
I
High flame
II
Stand-by and Ignition
III
Low flame
MAN-AUTO
mensions
Dimensions in
SQM4...
I
III
II
IV
V
VI
VI
V
IV
II
III
I
MAN-AUTO
A
C
B