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PART III: OPERATION
Double-stage burners
1
Once the air and gas flow rates are adjusted, turn the burner off, switch to the oil operation (OIL, on the burner control panel).
with the electrical panel open, prime the oil pump acting directly on the related CP contactor (see next picture): check the pump
2
motor rotation and keep pressing for some seconds until the oil circuit is charged;
bleed the air from the M pressure gauge port by loosing the cap without removing it, then release the contactor.
3
4
Remove the actuator cover.
5
Turn the burner on by means of its main switch : if the burner locks press the RESET button (C) on the control panel ;
6
start the burner up by means of the thermostat series and wait until the pre-purge time comes to an end;
Keep the burner to the low flame stage by disconnecting the TAB thermostat (remove the bricge between terminals 6 and 7).
7
8
Proceed as follows acting on the ST1 actuator cam to adjust the air flow rate in the low flame stage, checking the combustion
values:
9
I
II
III
Berger STA4.5
Refer to the next table for cams functions.
"Air adjustment in high flame" cam
Air adjustment in low flame - Stand-by - Ignition cam
Auxiliary cam for the opening consent to the second fuel valve
Berger STA4: this actuator is not provided with the manual control of the air damper. The adjustment of the cams is carried out by
means of a screwdriver, by twisting the VS screw located inside the cam.
Berger STA6: this actuator is not provided with the manual control of the air damper. The adjustment of the cams is carried out by
means of the cam lever
Siemens SQN72: a key is provided to move cams I and IV, the other cams can be moved by means of screws. On the Siemens
actuator the AUTO/MAN mode is provided (see picture).
Siemens SQN72: a key is provided to move cams I and IV, the other cams can be moved by means of screws. On the Siemens
actuator the AUTO/MAN mode is provided (see picture).
10 by removing the bridge between the 6 and 7 terminals of the TAB thermostat , the actuator moves to the position (degrees) set for
the ST1 cam (low flame cam);
11
to decrease the low flame position (and then decrease the opening angle of the actuator), move the cam to a lower position: the
CP
Suntec E.. / J..
VR
M
Fig. 12
IV
II
ST1
ST2
I
MV
Berger STA6
28
Siemens SQN72
BERGER STA4.5 BERGER STA4.5
I
ST2
II
ST1
III
MV
AUTO/MAN
Siemens SQN72
I (red)
II (blue)
IV (black)
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