M039150CF
30
9
drive the burner to low flame by means of the
TAB
thermostat.
10 To perform the regulation, remove the cap
D
and loosen the screw
V
(see Fig. 29), by means of a screwdriver (see Fig. 29). The
regulating screw
V
acts on the return pressurefrom the nozzle. Set the pressure to the minimum value of 5 bar. Read the values on
the pressure gauge placed on the regulator’s coupling
M
. Once the regulation is accomplished, replace cap
D
.
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
Note:
After a certain operating period, the pressure can change because of some dirt on the needle’s seal: remove the screw
VT
(see Fig. 27) and clean.
Fig. 26
Fig. 27 - Oil manual governor
Fig. 28
Fig. 29
D
Adjusting screw cap
V
Pressure adjusting screw
M
Pressure gauge port
VT
Needle screw
B
Return to tank
C
Return from nozzle
VRA
RA
TR
Pressure gauge port
D
M
C
VT
