Riello 3433723 Installation, Use And Maintenance Instructions page 23

FASTENING OF THE ELECTRICAL WIRES
All the wires, which have to be connected to the burner terminal
strip (16, fig. 1) shall pass through the fair leads (17, fig. 1), see fig.
2.
1 - Motor mono-phase supply: . . . . . . . . . . . . . . fair lead Pg 16
2 - Control thermostat: . . . . . . . . . . . . . . . . . . . . fair lead Pg 13.5
3 - Safety thermostat:. . . . . . . . . . . . . . . . . . . . . fair lead Pg 13.5
nd
4 - 2 stage thermostat: . . . . . . . . . . . . . . . . . . fair lead Pg 13.5
5 - Pre-sheared hole
Further prospective signals or controls can be connected to the burner terminal strip by removing the metal weld-
nuts from the pre-sheared holes and inserting a commun fair lead for the passage and the clamping of the leads.
NOTES
- Carry out a safe earth connection.
- Verify the burner stop by opening the boiler thermostat and the burner lock-out by darkening the photore-
sistance.
4. WORKING
4.1 CHOICE OF NOZZLES
Nozzle 20 bar
GPH (45° - 60°) kg/h
1.25 + 1.25 15.00
1.50 + 1.50 18.00
1.75 + 1.75 21.00
2.00 + 2.00 24.00
2.25 + 2.25 27.00
2.50 + 2.50 30.00
In case of very heavy oil it is advised to use
high wear resistance nozzles
(for instance Monarch F 80 H0).
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
A
5827
25 bar
kg/h
17.00
20.30
23.80
27.10
30.50
–
B
Set-point 4
D2635
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
kg/h
5
GB
Fig. 2
D2636
Set-point