
25
control panel - see chapter “OPERATION” on page 28.
6
be sure that the actuator cam for the “Startup enabling signal” (when used) is about 5° more than the ignition cam;
7
start the burner up by means of the thermostat series and wait until the pre-purge time comes to an end;
8
drive the burner to high flame stage, by means fo the thermostat
TAB
.
9
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).
10 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 showed on Fig. 14 and act on on the pump adjusting screw
VR
(see
Fig. 13) as to get the nozzle pressure at 20bar or 25bar (according to the nozzle model: Bergonzo or Fluidics nozzle - see
page 24).
11 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.
12 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
the rod
TR
towards the air damper shaft, the air damper opens and consequently the air flow rate increases, moving it far from the
shaft the air damper closes and the air flow rate decreases.
Note:
once the procedure is perfomed, be sure that the blocking nut
RA
is fasten. Do not change the position of the air damper
rods.
13 Only if necessary, change the combusiton head position: to let the burner operate at a lower output, loose the
VB
screw and move
progressively back the combustion head towards the MIN position, by turning clockwise the
VRT
ring nut. Fasten
VB
screw when
the adjustment is accomplished.
Siemens SQM40
Actuator cams
I
High flame
II
Stand-by and Ignition
III
Low flame
Fig. 14
Fig. 15
mensions
Dimensions in mm
SQM4...
I
III
II
IV
V
VI
90°
10°
0°
20°
30°
60°
VI
V
IV
II
III
I
MAN-AUTO
Pressure gauge port
RP
PG
V
SV
RA
VRA
Содержание TG90
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