23
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).
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).
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
Berger STM30
Siemens SQM40
Actuator cams
I
High flame
II
Stand-by and Ignition
III
Low flame
Fig. 23
Fig. 24
A
C
B
MAN-AUTO
mensions
Dimensions in
SQM4...
I
III
II
IV
V
VI
VI
V
IV
II
III
I
MAN-AUTO
Pressure gauge port
RP
PG
V
SV
