C.I.B. UNIGAS - M039134CD
17
mod. LO280 Air rate setting
z
Single stage burners
z
Double stage burners
Adjusting the actuator cams
Refer to the next table for cams functions.
z
Berger STA12: 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.
z
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).
During the first setting, set the cam III (Berger) / IV (Siemens) between the cams I and II. Then, passing from the low to high flame
stage, or viceversa, change the setting according to the flame composition: if cam III is too near to the low flame position (cam II), flue
gas can take place, because there is more fuel than air; if cam III is too near to the high flame (cam I), the flame could fade because of
too much air.
.
1
loosen
VR
screw
.
2
move the
ID
index along the graduated slot t or -, in order to
increase or decrease the air flow-rate, according to the required combu-
stion values.
3
fasten the
VR
screw again.
Fig. 29
Berger STA4.5
Siemens SQN72
BERGER STA
Siemens SQN72
”Air adjustment in high flame” cam
I
I (red)
Air adjustment in low flame - Stand-by - Ignition cam
II
II (blue)
EVG2 opening (2nd nozzle)
III
IV (black)
VR
ID
I
II
III
VS
IV
II
I
AUTO/MAN
