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5.8
Burner operation
5.8.1
Burner start-up
Control remote control TL closes.
Servomotor starts: turn to the right, as far as the angle
set on the cam with the orange lever.
After about 3s:
0 s
The control box starting cycle begins.
2 s
The fan motor starts.
3 s
Servomotor starts: turn to the right, until the contact in-
tervenes on the cam with the red lever.
The air damper goes to 2nd stage output.
Pre-purging phase with air flow rate of the 2nd stage out-
put.
Duration 25 s.
28 s
Servomotor starts: turn to the left, as far as the angle set
on the cam with the orange lever.
43 s
Ignition electrode strikes a spark.
The air damper and gas butterfly valve are in the 1st
stage output position.
The safety valve VS opens, along with the adjustment
valve VR, quick opening. The flame is ignited at a low
output level, point A. The output is then progressively in-
creased, with the valve opening slowly up the 1st stage
output, point B.
45 s
The spark goes out.
53 s
If the TR remote control is closed or replaced with a
jumper, the servomotor goes on rotating until the cam in-
tervenes with the red lever bringing the air damper and
gas butterfly valve to the 2nd stage, tract C-D.
End of control box program.
5.8.2
Steady state operation - System equipped
with a TR remote control
Once the start-up cycle is completed, the servomotor command
passes to the TR remote control that controls the pressure or
temperature in the boiler, point D.
(The control box still continues to check the presence of the flame
and the correct position of the air pressure switch).
•
When the temperature or pressure increases until the TR
opens, the servomotor closes the gas butterfly valve and air
damper, and the burner goes from the 2nd to the 1st operat-
ing stage, line E-F.
•
When the temperature or pressure falls until the TR closes,
the servomotor opens the gas butterfly valve and air damper,
and the burner passes from the 1st to the 2nd operating
stage. The sequence repeats endlessly.
•
The burner stops when the heat request is less than the
amount of heat delivered by the burner in the 1st stage, line
G-H. The TL remote control opens, and the servomotor re-
turns to the 0° angle limited by the cam with the blue lever.
The air damper closes completely to reduce heat losses to a
minimum.
System not equipped with control device TR (jumper wire in-
stalled)
The burner is fired as described above. If the temperature or
pressure increases until the TL opens, the burner shuts down
(tract A-A in diagram).
20151835
Start-up, calibration and operation of the burner
LED
*
RMG
*
Off
Yellow
For further details see page 29.
5.8.3
Ignition failure
If the burner does not fire, it goes into lockout within 3 s from the
opening of the gas valve and 49 s after the closure of the TL re-
mote control. The red LED of the control box comes on.
Burner flame goes out during operation
If the flame accidentally goes out during operation, the burner will
go into lockout within 1s.
LED
*
RMG
*
Off
Yellow
For further details see page 29.
28
GB
STANDARD IGNITION
(no. = seconds from instant 0)
Green
Red
IGNITION FAILURE
Red
D3051
Fig. 34
D3052
Fig. 35
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