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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
2915842
Lock-out because no ignition
11 GB
D2848
D3211
Viscosity at 50°C (°E)
D2749
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