Burner Operation; Burner Flame Goes Out During Oper- Ation - Riello RS 28 Instrucciones De Instalación, Funcionamiento Y Mantenimiento

RMG
*
LED
*
Off Yellow
For further details see page 17.
(A)
RMG
*
LED
*
Off Yellow
For further details see page 17.
(B)
NORMAL FIRING
(n° = seconds from instant 0)
Green
NO FIRING
Red

BURNER OPERATION

BURNER STARTING (A)
•
• 0 s : The control box starting cycle begins.
• 2 s : Fan motor starts.
• 3 s : Servomotor starts: it rotates during
• 28 s : Servomotor starts: it rotates during
• 43 s : The air gate valve and the gas butter-
• 45 s : The spark goes out.
• 53 s : If remote control device TR is closed
Red
STEADY STATE OPERATION (A)
System equipped with one control device TR.
Once the starting cycle has come to an end,
D3028
control of the servomotor passes on to the con-
trol device TR that controls boiler temperature or
pressure, point D.
(The control box will continue, however, to mon-
itor flame presence and the correct position of
the air pressure switch).
• When the temperature or the pressure
increases until the control device TR opens,
the servomotor closes the gas butterfly valve
and the air gate valve and the burner passes
from the 2nd to the 1st stage of operation,
section E-F.
• When the temperature or pressure decreases
until the control device TR closes, the servo-
motor opens the gas butterfly valve and the
air gate valve and the burner passes from the
1st to the 2nd stage of operation, and so on.
• The burner stops when the demand for heat
is less than the amount of heat delivered by
the burner in the 1st stage, section G-H. Con-
trol device TL now opens, the servomotor
returns toward the 0° position, limited in this
movement by cam St0. The air gate valve
closes completely to reduce heat losses to a
minimum.
Systems not equipped with control device TR
(jumper wire installed)
The burner is fired as described in the case
above. If the temperature or pressure increase
until control device TL opens, the burner shuts
down (Section A-A in the diagram).
FIRING FAILURE (B)
If the burner does not fire, it goes into lock-out
within 3 s of the opening of the gas solenoid
valve and 49 s after the closing of control
device TL. The control box red pilot light will
light up.
BURNER FLAME GOES OUT DURING OPER-
ATION
If the flame should accidentally go out during
D3029
operation, the burner will lock out within 1s.
16
: Control device TL closes.
Servomotor starts: it rotates during
opening up to the angle set on cam
St1.
After about 3s:
opening until contact on cam St2 is
tripped.
The air gate valve is positioned to 2nd
stage output.
Pre-purge stage with air delivery at
2nd stage output.
Duration 25 seconds.
closing up to the angle set on cam
St1.
fly are positioned to 1st stage output.
Ignition electrode strikes a spark.
Safety valve VS and adjustment valve
VR (rapid opening) open. The flame
is ignited at a low output level, point
A. Output is then progressively
increased, with the valve opening
slowly up to 1st stage output, point B.
or if it has been replaced by a jumper,
the servomotor will continue to turn
until the cam St2 come into operation,
setting the air gate valve and the gas
butterfly valve to the 2nd stage opera-
tion position, section C-D.
The control box starting cycle ends.