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6
;start the burner up by means of the thermostat series and wait until the pre-purge time comes to an end;
7
drive the burner to high flame stage, by means fo the thermostat TAB (as far as fully-modulating burners, see the related para-
graph).
8
Then move progressively the microswitch to higher values until it reaches the high flame position; always check the combustion
values and eventually adjusting the oil pressure (see next step).
MAN-AUTO
Berger STM30
9
the nozzle suplly pressureis already factory-set and must not be changed. Only if necessary, adjust the supply pressure as follows
(see related paragraph); insert a pressure gauge into the port shown on Fig. 23 and act on on the pump adjusting screw VR (see
Fig. 22) as to get the nozzle pressure at 25bar (Fluidics nozzles - see diagram on page 20).
Pressure gauge port
10 in order to get the maximum oil flow rate, adjust the pressure (reading its value on the PG pressure gauge) without changing the air flow
rate set during the gas operation adjustments (see prevoius paragraph): checking always the combustion parameters, the adjustment is to
be performed by means of the SV adjusting cam screw (see picture) when the cam has reached the high flame position.
11 To adjust the air flow rate in the high flame stage, loose the RA nut and screw VRA as to get the desired air flow rate: moving
C
MAN-AUTO
Siemens SQM40
Fig. 23
B
A
mensions
Dimensions in
VI
VI
SQM4...
V
V
IV
IV
III
III
II
II
I
I
RP
V
SV
Fig. 24
23
Actuator cams
I
High flame
II
Stand-by and Ignition
III
Low flame
PG
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