Operation Sequence Of The Burner; Steady State Operation; Undesired Shutdown During Operation; Firing Failure - Riello RL 800/M TC FS2 Instrucciones De Uso

6.8

Operation sequence of the burner

TL
TR
MV
MP
TA
VS VF VR VRS
SM
Legend (Fig. 31 and Fig. 32)
MV - Fan motor
MP - Pump motor
SM - Servomotor
TA - Ignition transformer
TL - Limit thermostat/pressure switch
TR - Adjustment thermostat/pressure
Y - Light oil valves
6.8.1

Steady state operation

 Burner without output regulator RWF40
At the end of the starting cycle, the servomotor control then pass-
es to the thermostat/pressure switch TR for boiler pressure or
temperature point C (Fig. 31).
(The control box continues, however, to check that the flame is
present and that the air pressure switch is in the correct position).
– If the temperature or pressure is low (and the thermostat/
pressure switch TR is consequently closed), the burner pro-
gressively increases its output to the MAX. value, (section C-
D).
– If subsequently the temperature or pressure increases until
thermostat/pressure switch TR opens, the burner progres-
sively decreases its output to the MIN. value (section E-F).
And so on.
– The burner locks out when demand for heat is less than the
heat supplied by the burner at min. output (section G-H).
Thermostat/pressure switch TL opens. The servomotor re-
turns to the 0° angle limited by contact with cam 2).
The gate valve closes completely to reduce thermal disper-
sion to a minimum.
Every time output is changed, the servomotor automatically mod-
ifies the fuel delivery, air delivery (fan gate valve) and air pressure
(2 shutters in the combustion head).
 Burner with output regulator RWF40
See the handbook enclosed with the regulator.
Start-up, calibration and operation of the burner
NORMAL FIRING
6.8.2

Undesired shutdown during operation

If the flame should accidentally go out during operation, the burn-
D11108
er will lock out within 1s.
6.8.3

Firing failure

If the burner does not fire, it goes into lock-out within (Fig. 32) 3
s of the opening of the gas solenoid valve and 119 s after the
closing of control device TL.
TL
TR
MV
MP
TA
VS VF VRS
VR
Fig. 31
SM
27 GB
FIRING FAILURE
D11109
Fig. 32
20034064