Unigas HP91A, Manual Of Installation - Use - Maintenance

Page: 26 / 87

C.I.B. UNIGAS - M039140CE
26
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 24.
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 increasing
too much or that the flues temperature gets too low to cause condensation in the chimney.
Adjustment procedure
To change the burner setting during the testing in the plant, follow the next procedure.
On the DUNGS MBC..SE gas valves group, set the pressure regulator to 1/3 of its stroke, using a 2.5 allen key.
The burner is factory-set wih the adjusting plate holes fully open, and the combustion head at its MAX position, so it is fit to work at the
maximum output.
To adjust the gas flow, partially close the holes, as follows:
1 loosen the three V screws that fix the adjusting plate D ;
2 insert a screwdriver on the adjusting plate notches and let it move CW/CCW as to open/close the holes;
3 once the adjustmet is performed, fasten the V screws.
z
HP91A - HP92A - HP93A
z
HP512A - HP515A - HP520A - HP525A
Now, adjust the burner according to the actuator model provided.
CAUTION: perform these adjustments once the burner is turned off and cooled.
*OOFOTFDITLBOUTDIMàTTFM/P
"MMFOLFZOP
$MÏEFTJYQBOTNÉMFOP
$IJBWFFTBHPOBMFDBWBOS
1
#S
Pressure setting
V
D
closed holes
open holes
V
D
closed holes
open holes