12
11/2010 - 300003201-001- F
M 300 S
Air shutter servomotor - M 302-1 S / M 302-2 S / M 302-3 S / M 302-4 S
Set cam MV between ST1 and ST2 (5° below ST2).
Air setting servomotor - M 302-5 S / M 302-6 S
The servomotor drives the cams opening the air shutter.
To regulate the opening of the air shutter, use the ST1 cams for min. speed and ST2 for max speed.
Set cam MV between ST1 and ST2 (5° below ST2). Set cam ST0 to 0°.
For fine adjustment, use screws located on cams.
The servomotor ensures the following:
1
Cam ST1
Setting the air flow (Stage1)
2
Cam ST2
Setting the air flow (Stage2)
3
Cam MV
Electro-valve opening (Stage2)
A
Burner start up
A-B
Preventilation
B-C
Ignition
C
Passage in 2 speed
C-D
Regulation
D
Burner stop
1
Cam MV
Electro-valve opening (Stage2)
2
Cam ST0
Closing air shutter (No air flow)
3
Cam ST2
Setting the air flow (Stage2)
4
Cam ST1
Setting the air flow (Stage1)
A
Burner start up
A-B
Preventilation
B-C
Ignition
C
Passage in 2 speed
C-D
Regulation
D
Burner stop
