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Air and Gas Flow Rate Settings by means of Siemens SQM40../Berger STM30.. actuator
MAN-AUTO
Berger STM30
1
check the fan motor rotation (see "Rotation of fan motor" on page 27).
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.
VI
VI
SQM4...
V
V
IV
IV
III
III
II
II
I
I
MAN-AUTO
Siemens SQM40
C
32
mensions
Dimensions in
I
High flame
II
Stand-by and Ignition
III
Low flame
B
A
Actuator cams
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