PART III: OPERATION
46
11 always checking the combustion values, adjust the low flame air flow rate by means of the actuator ST1 (Berger)/III (Siemens)
cam;
12 The low flame position must never match the ignition position that is why cam MV (Berger)/IV (Siemens) must be set 20°- 30° more
than the ignition position ST1 (Berger)/III (Siemens).
13 Turn the burner off and go on with the gas operation adjustment.
Attention:
z
Berger actuator: cams can be moved manually
z
Siemens actuator: set the MAN/AUTO lever to MAN to move the cams, rememeber to set it to AUTO once the adjustment
is accomplished.
z
Fig. 25
Berger STA12 B 3.41
Siemens SQN72
ST2 = High flame cam
ST0 = Ignition position
ST1 = Low flame
MV = Auxiliary cam for the second valve enabling
I = High flame cam (red)
II = Ignition position (blue)
III = Low flame (orange))
IV = Auxiliary cam for the second valve enabling (black)
Pressure gauge port
V
VT
D
B
C
M
C
D
B
M
VT
D
Adjusting screw cap
V
Pressure adjusting screw
M
Pressure gauge port
VT
Needle screw
B
Return to tank
C
Return from nozzle
Fig. 26 - Oil manual governor
MV
ST2
ST1
ST0
III
II
I
AUTO-MAN