Riello 3438964 Installation, Use And Maintenance Instructions page 48

4.7 BURNER START-UP CYCLE
Normal
Thermostat
Motor
Ignition transformer
Pre-purge
st
1 flame valve
nd
2 flame valve
rd
3 flame valve
Lock-out lamp
Factory setting: 20 s. 
(t )
x
This time determines the heavy oil tempera-
ture at ignition. It can be adjusted, accord-
ing to the fuel's viscosity, by the timer 22)
(Fig. 1). 
The adjacent diagram shows the suggest-
ed settings.
t max = 60 s
x
Motor lock-out
It is caused by the over load relay when overload
occurs or no current supply.
Re-set: push button 7) and 10) (Fig. 1).
NB.: Periodically clean the filter of the pre-heater
tank.

4.8 THREE STAGE OPERATION
rd
3 stage max.
nd
2 stage
st
1 stage
0
2915844
Lock-out because no ignition
14 GB
D2848
D3211
Viscosity at 50°C (°E)
D2749