49
6. AIR DAMPER ADJUSTMENT
The air dampers adjustment shall be set each time in relation with the nozzles delivery and the combustion chamber
pressurization.
Fig. 2 shows the placement of the air dampers as fig. 3 their correspondent hydraulic jacks.
To open or close the air dampers proceed as follows:
loose the ring nut 1), turn clockwise the exagonal body 2) in order to decrease the air flow,
and counterclockwise to increase it.
The right adjustment of the air dampers may be detect by checking the combustion results
in the three stages of burner operation.
To check the combustion during the different stages, the commutator should be set to the
position corresponding to the burner stage to be controlled.
7. ELECTRIC PANEL
HOURCOUNTER
Deducting the number of hours of 2
nd
nozzle hourcounter from those indicated in the 1
st
nozzle hourcounter you
could know how many hours the burner has been performing only at 1
st
stage; the same procedure to detect the per-
formance hours of the 2
nd
stage alone, deduct from the 2
nd
stage hourcounter the hours indicated in the 3
rd
nozzle
hourcounter.
The hours of 3
rd
stage operation are shown rightly on the 3
rd
nozzle hourcounter.
COMMUTATOR
Pos. 0:
Burner stop
Pos. 1:
Burner operation only at 1
st
stage
Pos. 2:
Burner operation at 1
st
and 2
nd
stage
Pos. 3:
Burner operation at 1
st
, 2
nd
, 3
rd
stage
MOTOR LOCK-OUT
It is caused by the overload relay in case of overload or no electic supply.
Release by pressing the pushbutton on thermal relay.
1
st
stage air damper
2
nd
stage air damper
3
rd
stage air damper
3
rd
stage hyd. jack
2
nd
stage hyd. jack
1
st
stage hyd. jack
Fig. 2
Fig. 3
2
nd
nozzle hourcounter with operation signal
1
st
nozzle hourcounter with operation signal
3
rd
nozzle hourcounter with operation signal
Motor lock-out signal
4 positions commutator
Control box lock-out signal with re-set
push-button
