30
7
Only if necessary, adjust the supply pressure as follows;insert a pressure gauge into the port shown on figure and act on on the
pump adjusting screw
VR
. Pressure values are indicated at the beginning of this paragraph.
8
in order to get the maximum oil flow rate, adjust the pressure (reading its value on the
PG
pressure gauge: checking always the combu-
stion parameters, the adjustment is to be performed by means of the
SV2
adjusting cam screw when the cam has reached the high flame
position.
9
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.
10 If necessary, adjust the combustion head position (see the dedicated paragraph)..
11 once the oil rate is adjusted at the maximum output, go on with the point to point adjustment on the
SV2
adjusting cam as to reach
the minimum output point, as described on the next steps.
12 as for the point-to-point regulation, move the gas low flame microswitch a little lower than the maximum position (90°);
13 set the
TAB
thermostat to the minimum in order that the actuator moves progressively towards the low flame position (as far as
fully-modulating burners, see the related paragraph);
14 move the low flame cam to the minimum to move the actuator towards the low flame until the two bearings find the adjusting screw
that refers to the lower position: screw
V2
to increase the rate, unscrew to decrease.
15 Move again cam III towards the minimum to meet the next screw on the adjusting cam and repeat the previous step; go on this way
as to reach the desired low flame point.
16 The low flame position must never match the ignition position that is why the cam must be set 20°- 30° more than the ignition posi-
tion.
Fig. 14
Fig. 15
Attention! if it is necessary to change the head position, repeat the air and gas adjustments described above.
Pressure gauge port
RP
PG
V2
SV2
VRA
RA
TR
SQM40
.265 CSW
Actuator cams
MAN-AUTO
I
High flame
II
Stand-by
III
Low flame - gas
-
-
VI
Ignition - gas
X3
X2
X1
