C.I.B. UNIGAS - M039134CD
19
Tab. 4
LO400 -Double-stage
First start and air rate setting
(MOD.
LO400
)
Connections for pressure measurement
RATE
OUTPUT
PUMP PRESSURE
kg/h
kcal/h
kW
10bar
12bar
14bar
30
306.300
356
3.50+4.50
3.00+4.00
3.00+3.50
35
357.350
416
4.00+5.00
3.50+5.00
3.50+4.00
40
408.400
475
4.50+6.00
4.00+5.50
4.00+5.00
45
459.450
534
5.00+6.50
4.50+6.00
4.00+6.00
50
510.500
594
5.50+7.50
5.00+7.00
4.50+6.50
Single stage burners
Set the air rate working on the screw
VBS
(Fig. 32); screw to decrease
the air rate or unscrew to increase it.
Double-stage burners
z
The air flow can be adjusted using the air damper servo-control
cams as follows.
z
Remove the burner cover cover.
z
Remove the actuator cover.
z
Start the burner and let it burn at low flame (remove the bridge
between terminals
T6
and
T8
).
z
Adjust the air flow in low flame by working on the proper cam (page
20).
z
Prime the second nozzle using the following procedure:
z
Start the burner
z
When the flame appears press the
P1
button (Fig. 33) for a few
seconds to fill the second nozzle pipe;
z
The cycle continues, and if the TAB thermostat is connected, the
flame control box brings the burner to high flame. If the
TAB
ther-
mostat is not connected, bridge Terminals
T6
and
T8
on the con-
nector (see pag. 11). Adjust the air flow at high flame by working on
the appropriate cam.
z
The cam that enables the opening of the 2nd stage fuel valve (valve
EVG2) must be set in an intermediate position between the other
two cams.
z
Replace the cover on the actuator.
z
Replace the burner cover.
Fig. 32
Fig. 33 - - Second nozzle ignition pushbutton on double stage
burners
VBS
P1
Fan air pressure port
Combustion chamber pressure port
