Burner Operation - Riello RL 28/1 Installation, Use And Maintenance Manual

LED
*
RMO
LED
*
RMO
*
Off Yellow
For further details see page 13.
(A)
(B)
D3262
D3268
Green Red
D601
11

BURNER OPERATION

BURNER STARTING (A) - (B)
Starting phases with progressive time intervals
shown in seconds:
• Control device TL closes.
After about 3s:
• 0 s : The control box starting cycle begins.
• 2 s : The fan motor starts.
• 3 s : The ignition transformer is connected.
The pump 3) sucks the fuel from the tank
through the piping 1) and the filter 2) and
pumps it under pressure to delivery. The pis-
ton 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
solenoid valves 8) - 11), de-energized, close
the passage to the nozzles.
Prepurging begins with the max. air delivery.
• 22 s : The solenoid valve 8) opens and the
fuel passes through the piping 9) and filter 10)
and is then sprayed out through the 1st noz-
zle, igniting when it comes into contact with
the spark. This is the ignition flame.
• 29 s: The ignition transformer switches off.
• 36 s: The solenoid valve 11) opens, the fuel
passes through the piping 13) and filter 14)
and is then sprayed out through the 2nd noz-
zle. This is the operating flame
The starting cycle comes to an end.
STEADY STATE OPERATION
When the boiler temperature or pressure
increases until control device TL opens, the
burner shuts down.
FIRING FAILURE
If the burner does not fire, it goes into lock-out with-
in 5 s of the opening of the 1st nozzle valve and 30
s after the closing of control device TL.
The control box red pilot light will light up.
UNDESIRED SHUTDOWN DURING OPERA-
TION
If the flame goes out during operation, the burner
shuts down automatically within 1 second and
automatically attempts to start again by repeat-
ing the starting cycle.
Figure (B)
M = Pressure gauge
V = Vacuum meter