Unigas P91A, Manual Of Installation - Use - Maintenance

Page: 33 / 105

PART III: OPERATION
33
adjustment is accomplished.
Center head holes gas flow regulation (natural gas burners)
To adjust the gas flow, partially close the holes, as fol-
lows:
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.
The adjusting plate correct position must be regulated in the plant during the commissioning.
The factory setting depends on the type of fuel for which the burner is designed:

For natural gas burners, plate holes are fully opened
Center head holes gas flow regulation (LPG burners)
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.
The adjusting plate correct position must be regulated in the plant during the commissioning.
The factory setting depends on the type of fuel for which the burner is designed:

For LPG burners, plate holes are opened about:
9xA series : 1,5 mm
5xxA series : 1,3 mm
CAUTION: perform these adjustments once the burner is turned off and cooled.
VRT
VB
“MAX” head position
”MIN” head position
V
D
A:
opened holes
B:
closed holes
B
A
V
D
A:
opened holes
B:
closed holes
B
A