Steady State Operation; Firing Failure; Flame Signal Measurement; Final Checks (With The Burner Working) - Riello RLS 280/E Installation, Use And Maintenance Instructions

5.9.1

Steady state operation

At the end of the starting cycle, the servomotor control then passes
to load control for boiler pressure or temperature.
 If the temperature or pressure is low (and the load control is
consequently closed), the burner progressively increases out-
put up to MAX.
 If subsequently the temperature or pressure increases until
the load control opens, the burner progressively decreases
output down to MIN.

5.10 Firing failure

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

5.11 Flame signal measurement

Check the flame signal through the parameter 954, as indicated in
Fig. 39. The displayed value is expressed in percentage.
The value during the operation must be higher than 24%. If at the
burner start-up the value is higher or equal of 18%, the burner locks
out due to the extraneous light.
For further and specific information, please refer to the specific
instruction manual.
The display (Fig. 39) shows parameter 954: flashing on the left. On
the right, the flame's intensity is displayed as a percentage.
Example: 954: 0.0

5.12 Final checks (with the burner working)

 Open the control limit operation
 Open the high limit operation
 Rotate the maximum gas pressure switch knob to the mini-
mum end-of-scale position
 Rotate the air pressure switch knob to the maximum end of
scale position
 Rotate the maximum oil pressure switch at the minimum of
the scale
 Switch off the burner and disconnect the voltage
 Disconnect the minimum gas pressure switch
 Rotate the minimum low oil pressure switch at the maximum
of the scale
 Cover the QRI flame detector
Make sure that the mechanical locking systems on
the different adjustment devices are fully tightened.
WARNING
Start-up, calibration and operation of the burner
41
 The burner shuts off when demand for heat is less than the
heat supplied by the burner in the MIN output.
 The servomotor returns to the 0° angle. The air damper closes
completely to reduce thermal dispersion to a minimum.
Every time output is changed, the servomotor automatically modi-
fies oil delivery (pressure regulator) and air delivery (fan damper).
S8171

The burner must stop

The burner must stop in lockout

The burner must not start

The burner must stop in lockout due to firing failure
GB
P
V h min s %
Fig. 39
Tab. P
20106891