20013756
10
GB
5.2
SETTING OF THE AIR DAMPER SERVOMOTOR
(see fig. 2)
CAM II
assures the fully closed position of the air damper, when the burner is
shut down (stand by). It is adjusted by the factory at 0°.
DO NOT ALTER
.
CAM III
adjusts the air damper for the ignition and for the minimum output. It is
set at 20° by the factory. Do not decrease that value; it can be increased a little,
following the need of the application.
CAM I
limits the rotation at the maximum output. It is adjusted at 90° by the fac-
tory.
DO NOT INCREASE THAT VALUE
: the burner can be damaged.
5.3
COMMISSIONING
After completing both the electrical and gas valve connections, set the minimum air and the gas pressure
switches at minimum value; the maximum air pressure switch must be first set at maximum value. These will
be adjusted only at the end of commissioning procedure.
Connect a manometer to the gas pressure test point situated on the burner.
1)
For guidance the following table shows:
– the capacity required by the application;
– the minimum firing rate achieved for each capacity;
– approximate gas pressure measured at the combustion head, depending on the maximum capacity re-
quired;
– the setting for the air damper.
(
)
These values refer to a combustion chamber with 0 [mbar] back pressure at maximum output.
2)
For the maximum capacity required, first set the head (section 5.1), and then the manual air damper as
per the table at page 10.
Ty
p
e
Thermal power
Min output
Gas pressure on
combustion head
Air damper
adjustment
kW
kW
mbar (
)
Set point
729
T5
0
42
22
1.4
4
60
26
2.4
5
81
30
3.2
6
106
35
3.7
8
730
T50
81
43
3.2
5.25
159
47.8
4.6
7
170.3
48.9
5.1
max
STAND-BY
CAM II (Blue)
FIRST STAGE
CAM III (Orange)
SECOND STAGE
CAM I (Red)
D4047
Red
Orange
Blue
Fig. 2
NOTE
The servomotor is equipped with two micrometric
screws for a careful setting of
CAM II (Blue)
and
CAM III (Orange)
.
