Operation Sequence Of The Burner; Burner Start-Up; Steady State Operation; Ignition Failure - Riello RL 190/M Installation, Use And Maintenance Instructions

6.5

Operation sequence of the burner

6.5.1

Burner start-up

M
123 131
VS VF VR
128
48 85
MAX
121
M
MIN
0
C
6
2
A B
1
0
128 153
131
0 sec
20169283
0 s : TL remote control closing, motor starting.
The pump 3) sucks the fuel from the tank through the
piping 1) and pumps it under pressure 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 towards the suction
line and the solenoid valves 2)-8)-9)-16), de-
energised, close the path towards the nozzle.
6 s : Servomotor start-up: turn to the right by 130°, i.e. until
the contact intervenes on cam I) (Fig. 32 on page 28).
The air damper is positioned to MAX output.
48 s : Pre-purging stage with MAX output air flow.
85 s : The servomotor rotates to the left until the contact on
cam Iii) activates (Fig. 32 on page 28).
121 s : The air damper and the pressure variator go to the
ignition output position.
123 s : Ignition electrode strikes a spark.
128 s : Solenoid valves 2)-8)-9)-16) open; the fuel goes
through the duct 10), passing through the filter 11) and
enters the nozzle. A part of the fuel is sprayed out of the
nozzle and when it reaches the spark ignites: low
output flame, point A; the rest of the fuel goes through
the duct 12 at the pressure preset by the variator 13,
then it goes back to the tank through the duct 7).
131 s : The spark goes out.
153 s : The start-up cycle ends.
6.6

Final checks

 Block the flame sensor and turn off the remote controls:
the burner must start and then stop in lockout after
approximately 5 s after start-up.
 Free the flame sensor and turn off the remote controls:
the burner must start
approximatel0y 10 s.
 Block the flame sensor with burner on, the following
must occur in sequence: the flame goes out within 1 s and
the cycle is repeated.
 Turn on the remote control TL followed by TS while the
burner is operating: the burner must stop.
20166451
Start-up, calibration and operation of the burner
D
E
Fig. 35
and stop in lockout
6.5.2

Steady state operation

Burner without output regulator RWF
Once the start-up cycle is completed, the servomotor command
moves on to the TR remote control that controls the pressure or
the temperature in the boiler, point B.
 If the temperature or pressure is low (so the TR remote
control is closed), the burner progressively increases the
output up to the MAX value (section B-C).
 If subsequently the temperature or pressure increases until
TR opens, the burner progressively decreases its output to
the MIN value (section D-E). And so on.
 The burner locks out when the heat request is less than the
heat supplied by the burner at MIN output, (section F-G).
The TL remote control opens, the servomotor returns to
angle 0° limited by the contact of cam II)(Fig. 33 on
F
page 28). The air damper closes completely to reduce heat
G
losses to a minimum.
With each change of output, the servomotor automatically
modifies the light oil output (pressure variator) and the air flow
rate (fan damper).
Burner with output regulator RWF
See the manual supplied with the regulator.
6.5.3

Ignition failure

If the burner does not ignite, it locks out within 5 seconds after the
light oil valve opens, and the post-purging phase starts lasting 15
seconds.
6.5.4

Burner flame goes out during operation

If the flame should accidentally go out during operation, the
burner will lock out within 1 second.
Make sure that the mechanical locking systems
on the adjustment devices are fully tightened.
ATTENTION
after
30 GB