Burner Operation - Riello RS 34 MZ Instrucciones De Instalación, Uso Y Mantenimiento

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

BURNER OPERATION

BURNER START UP (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 damper and the gas butterfly
• 45 s : The spark goes out.
• 53 s : If remote control device TR is closed
Red
STEADY STATE OPERATION (A)
System equipped with one remote control TR
D3028
Once the starting cycle has come to an end,
control of the servomotor passes on to the
remote control TR that controls boiler tempera-
ture 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 damper 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
damper and the burner passes from the 1st to
the 2nd stage of operation. The sequence
repeats endlessly.
• The stopping of the burner occurs when the
heat requirement is lower than that supplied
by the burner in the 1st stage , tract G - H.
The TL remote control opens, the servomotor
returns to angle 0° limited by cam St0. The
air damper closes completely to reduce heat
losses to a minimum.
Systems not equipped with TR (bridge
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 lockout
within 3 s of the opening of the gas solenoid
valve and 49 s after the closing of remote con-
trol 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.
14
: Remote control 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 damper 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.
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 bridge,
the servomotor will continue to turn
until the cam St2 come into operation,
setting the air damper and the gas
butterfly valve to the 2nd stage opera-
tion position, section C-D.
The control box starting cycle ends.