34
Adjustment by the Siemens SQL33.. actuator
1
open the electrical panel to check the fam motor rotation and act directly on the related contactor (see next picture).
2
Turn the burner on by means of its main switch
A
: if the burner locks (LED
B
on in the control panel) press the RESET button (
C
)
on the control panel - see chapter “OPERATION” on page 40 .
3
Start the burner up by means of the thermostat series and wait until the pre-purge time comes to an end and that the burner starts
up;
4
the burner starts up with the actuator on the ignition position, set it to the
MAN
(manual mode), by the
MAN/AUTO
selector (ignition
position= read on the air damper index
ID1
- see picture on pag.31);
5
disconnect the
TAB
thermostat removing the wire from the terminal no. 6 or by setting MAN on the RWF40 modulatore or by set-
ting 0 by means of the
CMF
switch (only for fully-modulating burners);
6
manually drive the adjusting cam
SV
to the high flame position and set the actuator to the AUTO mode (by the related switch - see
picture) to lock the adjusting cam.
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 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.
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.
SQL330.. actuator cams
A = (red) cam locking lever for “high flame”
S = (green) cam locking lever for “stand-by and ignition”
BF = Low flame
F = plastic cam
A
C
B
MAN
AUT
BF
F
A
S
VR
T
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Siemens VGD..
Dungs MBC..SE
