2861
12
GB
6.4
FIRST START-UP,
(see fig. 13 and fig. 5 page 6)
Once you have made sure wiring is correct, and checked hydraulic connections
for leaks, set the air pressure switch to the minimum value.
Connect the pressure gauge to the gas pressure test point at the burner head
(
M3
, fig. 7 page 7).
The following table gives start-up settings with reference to a burner fuelled
with methane gas.
Reference values are:
–
firing power;
–
air damper preset position (
CAM III
);
–
preset position of gas train
POINT 0
setting screw;
–
the model of gas train to be used.
X
Set to values close to start of scale (-1.5).
1
- Depending on required maximum output, adjust the combustion head as indicated on page 10.
2
- Select manual operating mode
“MAN”
and calibrate the servomotor’s
CAM III
and adjust the
0 POINT
setting screw as indicated in the table, then start the burner.
3
- Once it has fired, move the servomotor by hand towards the second flame position by pressing switch
(+)
. During this operation, check flame stability: if it looks unstable, adjust the
GAS/AIR RATIO
setting
screw to increase or decrease the setting
until you reach the maximum desired output and correct
CO
2
values for fumes
. Next, set
CAM I
to the value reached by the servomotor.
4
- Move the servomotor by hand towards the first flame position by pressing switch
(-)
.
Check combustion and, where necessary, use the
0 POINT
setting screw only to achieve correct CO
2
values for fumes.
5
- If first flame output needs altering, adjust
CAM III
.
All
0 POINT
setting screw adjustments will also cause the maximum gas delivery to be varied.
6
- Return the servomotor to maximum opening and check maximum output again, adjusting with the
GAS/
AIR RATIO
setting screw.
7
- Turn the servomotor to first flame position again and adjust output again, adjusting with the
0 POINT
setting screw only.
8
- Repeat steps (6) and (7) until
GAS/AIR RATIO
and
0 POINT
setting screws no longer need adjusting.
9
- Check combustion values at intermediate output and, where necessary, adjust further with
GAS/AIR
RATIO
and
0 POINT
setting screws.
Once you have done, and have made sure the burner features good firing and good flame stability, se-
lect automatic mode by setting the selector to
“AUT”
. modulation will occur between the setting posi-
tion of
CAM III
and that of
CAM I
.
TYPE
Firing power
Adjustment
CAM III
Adjustment
0 POINT
Adjustment
GAS/AIR RATIO
GAS TRAIN
kW
Set point
Set point
Set point
Model
916M
26
÷
33
20°
÷
30°
X
Depends on maximum
output
CG 120
917M
48
÷
83
30°
÷
40°
X
CG 220
918M
68
÷
110
30°
÷
35°
X
CG 220
917M
48
−
83
30°
−
40°
0.1
−
0.25
Depends on maximum
output
MBC - 300 - VEF
918M
68
−
110
30°
−
35°
-0.7
−
-0.5
MBC - 700 - VEF
AUT
MAN
+
-
OFF
Fig. 13
D4468
