Unigas PG70, Manual Of Installation - Use - Maintenance

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CIB UNIGAS - M039191CA
20
10 in order to get the maximum oil flow rate, adjust the pressure (reading its value on the
PG
pressure gauge) without changing th e air flow
rate set during the gas operation adjustments (see prevoius paragraph): checking always the combustion parameters, the adjustment is to
be performed by means of the
SV
adjusting cam screw (see picture Fig. 17) when the cam has reached the high flame position.
11 To adjust the
air flow rate in the high flame stage
, loose the
RA
nut and screw
VRA
as to get the desired air flow rate: moving
the rod
TR
towards the air damper shaft, the air damper opens and consequently the air flow rate increases, moving it far from the
shaft the air damper closes and the air flow rate decreases.
Note:
once the procedure is perfomed, be sure that the b locking nut
RA
is fasten. Do not change the position of the air da mper
rods.
12 The burner is factory-set with the head in its MAX position (maximum output).
PG60:
To let the burner operate at a lower output, turn clockwise the
VRT
screw and move progressively the combustion head back towards
the MIN position.
PG70-PG81:
To let the burner operate at a lower output, loose the
VB
screw and move progressively the combustion head back towards the MIN
position, by turning clockwise the
VRT
ring nut. Fasten
VB
screw when the adjustment is accomplished.
Attention!
if it is necessary to change the head position, repeat the air and gas adjustments described above.
13 the air and oil rate are now adjusted at the maximum power stage, go on with the point to point adjustement on the
SV
adjusting
cam as to reach the minimum output point.
14 as for the point-to-point regulation in order to set the cam foil shape, move the low flame microswitch (cam III) a little lower than the
maximum position (90°);
PG60 PG70-PG81
VRA
RA
TR
VB
VB
VRT
”MIN” position ”MAX” position
SC
ID
RP
V
SV