Riello PRESS 100 N Installation, Use And Maintenance Instructions page 17

4. WORKING
4.1 CHOICE OF NOZZLES
In case of very heavy oil it is advised to use high wear resist-
ance nozzles (for instance Monarch F 80 H0).
4.2 PUMP PRESSURE
Advised pressure:
- Light oil: 20 bar
- Heavy oil: 25 bar (see modification kit)
Rated deliveries of the nozzles are indicated on the above
list and refer to a light oil having viscosity from 3 to 5°E at 50°
C pre-heated at 100°C.
The effective delivery may vary of ± 5% against the rated
one. In case of requirement of intermediate values, the pump
pressure or the nozzles match could be changed.
The pump is set by the factory set at 20 bar.

4.3 COMBUSTION HEAD ADJUSTMENT
Turn the screw A, fig. 3 till the set-point, detected from the
diagram, is on the line with the washer B, fig. 3.
Fig. 3
D2637
4.4 ADJUSTMENT OF THE AIR DAMPER MOTOR
STOP - Blue lever
This lever leaves the factory vertically positioned and corre-
sponds to the complete closing of the air damper. A partial
opening of the air damper might be obtained by moving left-
wards this lever (+ on the label).
The new position of the air damper is detectable when the burn-
er is off. Do not overcome the position of the orange lever for
st
the 1 stage.
st
1 STAGE - Orange lever
The orange lever controls the air damper position for the first
flame, it is adjustable both for opening and closing.
nd
2 STAGE - Red and black levers
The red lever controls the air damper position for the second
flame, it is adjustable both for closing and opening. 
The black lever controls the opening of the second oil valve and
it must always anticipate - for a bit - the red lever, but never the
orange one.
2915830
B
Set-point 4
A
6
Nozzle
GPH (45° - 60°)
3.50 + 3.50
4.00 + 4.00
4.50 + 4.50
5.00 + 5.00
5.50 + 5.50
6.00 + 6.00
6.50 + 6.50
7.00 + 7.00
7.50 + 7.50
8.00 + 8.00
8.50 + 8.50
kg/h
Black lever
Red lever
Orange lever
Blue lever
Opening +
GB
20 bar 25 bar
kg/h kg/h
42.00 47.40
48.00 54.20
54.00 61.00
60.00 67.80
66.10 74.50
72.10 81.40
78.10 88.10
84.10 95.00
90.10 101.60
96.10 –
100.00 –
D2712
Set-point
– Closing
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