Riello RL 70/M Instrucciones De Instalación, Funcionamiento Y Mantenimiento página 26

8.2.1 Burner starting (Fig. 31) - (Fig. 32)
D1230
D1231
2915996
Burner calibration
8.2.2 Steady state operation (Fig. 31)
Burner without output regulator RWF
At the end of the starting cycle, the servo-motor control then
passes to load control TR for boiler pressure or temperature,
point B.
 If the temperature or pressure is low (and the TR load con-
trol is consequently closed), the burner progressively
increases output up to MAX (section B-C).
 If subsequently the temperature or pressure increases until
TR opens, the burner progressively decreases output down
to MIN (section D-E). And so on.
 The burner locks out when demand for heat is less than the
heat supplied by the burner in the MIN output (section F-G).
Load control TL opens. The servomotor returns to the 0°
angle limited by contact with cam II)(Fig. 30 page 23).The
gate valve closes completely to reduce thermal dispersion
to a minimum.
Every time output is changed, the servomotor automatically mod-
ifies gas oil delivery (pressure regulator) and air delivery (fan gate
valve).
Fig. 31
Burner with output regulator RWF
See the handbook enclosed with the regulator.
8.2.3 Firing failure
If the burner does not fire, it goes into lock-out within 5 s of the
opening of the light oil valve.
8.2.4 Undesired shutdown during operation
If the flame should go out for accidental reasons during operation,
the burner will lock out in 1 s.
8.2.5 Final checks
 Obscure the flame sensor and switch off the control
devices: the burner should start and then lock-out about 5 s
after starting.
 Illuminate the flame sensor and switch off the control
devices: burner should go into lock-out.
 Obscure the flame sensor while the burner is operating:
flame should go out and burner lock out within 1 s.
 Switch off control device TL followed by control device
TS while the burner is operating: the burner should stop.
Fig. 32
24 GB