Unigas IDEA LG280, Manual Of Installation - Use - Maintenance

Page: 33 / 89

C.I.B. UNIGAS - M039132CD
33
Adjustments - brief description
Adjust the air and gas flow rates at the maximum output (“high flame”) first, by means of the air damper and the adjusting cam respec-
tively.
z
Check that the combustion parameters are in the suggested limits.
z
Check the flow rate measuring it on the counter or, if it was not possible, verifying the combustion head pressure by means of a dif-
ferential pressure gauge, as described on par. “Measuring the gas pressure in the combustion head” on page 18.
z
Then, adjust the combustion values corresponding to the points between maximum and minimum: set the shape of the adjusting
cam foil. The adjusting cam sets the air/gas ratio in those points, regulating the opening-closing of the throttle gas valve.
z
.Set, now, the low flame output, acting on the low flame microswitch of the actuator in order to avoid the low flame output increa-
sing too much or that the flues temperature gets too low to cause condensation in the chimney.
To change the burner setting during the testing in the plant, follows the next procedure, according to the model provided.
Adjustment procedure
To change the burner setting during the testing in the plant, follows the next procedure,
according to the burner operation.
Before starting the burner up, adjust the valves group slow opening: to set the slow ope-
ning remove cover
T , reverse it upside down and use it as a toolto rotate screw VR . Decre-
ase the ignition flow rate by screwing, increase it by unscrewing. Do not use a screwdriver
on the screw
VR !
Note: the screw VSB must be removed only in case of replacemente of the coil.
1 remove the burner cover
2 startup the burner by turning its main switch A to on: if the burner locks (LED B on in
the control panel) press the RESET button ( C ) on the control panel (Fig. 49).
The burner is adjusted in the factory with the combustion head in the position that refers to
the "MAX" output. The maximum output setting refers to the “fully-ahead” position of the
combustion head, as far as standard models (Fig. 44), and to “fully-backward” position for
low NOx burners (Fig. 45). As for “fully-ahead” position, it means that the head is placed
inside the boiler, “fully-backward” position means that the head is towards the operator. As far as the reduced output operation, pro-
gressively move the combusiton head towards the “MIN” position, rotating clockwise the
VRT screw (Fig. 43). The ID index shows how
much the combustion head moved.
3 once the combustion head is adjusted, remove the actuator cover and set it to the ignition position, (ignition position= 0° on the air
damper index
ID );
4 (Progressive/Fully-modulating burners) Before starting the burner up, drive the high flame actuator microswitch matching the low
flame one (in order to let the burner operates at the lowest output) to safely achieve the high flame stage.
Fig. 44 - Head in “fully-ahead position”
Fig. 45 - Head in “fully-backward position”
C VS T(VR)
RP
VB
VSB
VRT
Fig. 43
ID