Burner Operation; Firing Failure - Riello RL 190/M Instrucciones De Instalación, Uso Y Mantenimiento

(A)
(B)
D1230
D1986
13

BURNER OPERATION

BURNER STARTING (A) - (B)
• 0 s :
Control device TL closes, the motor starts.
The pump 3) sucks the fuel from the tank
through the piping 1) and pumps it under pres-
sure to delivery. The piston 4) rises and the
fuel returns to the tank through the piping 5) -
7). The screw 6) closes the by-pass heading
towards suction and the de-energized solenoid
valves 2) - 8) - 9) - 16) close the passage to
the nozzle.
• 5 s :
Servomotor starts: 130° rotation to right, until
contact is made on cam I)(A)p.10. The air gate
valve is positioned on MAX. output.
• 47 s :
Pre-purge stage with air delivery at MAX. out-
put.
• 69 s :
Servomotor rotates to left until contact is made
on cam III)(A)p.10.
• 106 s :
Air gate valve and pressure regulator are posi-
tioned on MIN output.
• 108 s : 
Ignition electrode strikes a spark.
• 111 s :
Solenoid valves 2) - 8) - 9) - 16) open; the fuel
passes through the piping 10) and filter 11),
and enters the nozzle.
A part of the fuel is then sprayed out through
the nozzle, igniting when it comes into contact
with the spark: flame at a low output level,
point A; the rest of the fuel passes through pip-
ing 12) at the pressure adjusted by the regula-
tor 13), then, through piping 7), it goes back
into the tank.
• 116 s :
The spark goes out.
• 126 s :
The starting cycle ends.
STEADY STATE OPERATION (A)
Burner without output regulator RWF40
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 control 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 progres-
sively 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)(A)p.10. The gate valve closes com-
pletely to reduce thermal dispersion to a mini-
mum.
Every time output is changed, the servomotor
automatically modifies gas oil delivery (pressure
regulator) and air delivery (fan gate valve).
Burner with output regulator RWF40
See the handbook enclosed with the regulator.

FIRING FAILURE

If the burner does not fire, it goes into lock-out
within 5 s of the opening of the light oil valve.
FIRING FAILURE
If the flame should go out for accidental reasons
during operation, the burner will lock out in 1 s.