Unigas HR2050, Manual Of Installation - Use - Maintenance

Page: 44 / 80

PART III: OPERATION
44
Adjusting the combustion head
Only if necessary, change the combusiton head position: to let the burner operate at a lower output, loose the VB screw and move pro-
gressively back the combustion head towards the MIN position, by turning clockwise the VRT ring nut. Fasten VB screw when the
adjustment is accomplished.
Adjustment procedure for light oil operation
The light oil flow rate can be adjusted choosing a nozzle that suits the boiler/utilisation output and setting the delivery and return pres-
sure values according to the ones quoted on the following charts.
жидкого
Attention! if it is necessary to change the head position, repeat the air and fuel adjustments described above.
WARNING: please read carefully the paragraph “Fuel” at the beginning of this manual.
VRT
VB
“MAX” head position
”MIN” head position