Unigas HTP2000 Installation Manual page 39

Center head holes gas flow regulation (natural gas 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.
open holes
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

Adjusting the ignition electrode
ATTENTION: avoid the electrode to get in touch with metallic parts (blast tube, head, etc.), otherwise the boiler
operation would be compromised. Check the electrode position after any intervention on the combustion head.
V
D
closed holes
Fig. 18 - Detailed view of the diffuser with pilot (P) and ignition elecctrode (E)
E
P
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PART IV: MAINTENANCE