Operation Sequence Of The Burner; Burner Start-Up; Operation; Ignition Failure - Riello RS 150 Installation, Use And Maintenance Instructions

5.7

Operation sequence of the burner

5.7.1

Burner start-up

Control remote control TL closes (Fig. 35).
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 program starts up.
2 s The fan motor starts up.
3 s The servomotor starts up: turn to the right, until the con-
tact intervenes on the cam with the red lever.
The air damper goes to 2nd stage output.
Pre-purging phase with air flow rate at 2nd stage output
level. Duration 25 s.
28 s The servomotor starts up: turn to the left, as far as the an-
gle set on the cam with the orange lever.
43 s The ignition electrode strikes a spark.
The air damper and gas butterfly valve are at 1st stage
output level.
The safety valve VS opens, along with the adjustment
valve VR, quick opening. The flame ignites with a small
output - point A. The output gradually increases, and the
valve slowly opens, until 1st stage output is reached -
point B.
45 s The spark goes out.
53 s If the TR remote control is closed or replace with a jumper,
the servomotor goes on rotating until the cam intervenes
with the red lever, bring the air damper and gas butterfly
valve to the 2nd stage - tract C-D.
The control box starting cycle ends. When heat demand (TL) is
satisfied, the post-purging phase (*20s) starts.
5.7.2

Operation

System equipped with TR remote control (Fig. 35)
Once the start-up cycle is completed, the servomotor command
moves on 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 and opens the
TR, the servomotor closes the gas butterfly valve and air
damper, and the burner goes from the 2nd to the 1st operat-
ing stage - tract E/F.
 When the temperature or pressure falls and closes the TR,
the servomotor opens the gas butterfly valve and air
damper, and the burner goes from the 1st to the 2nd operat-
ing 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, tract
G-H.
The TL remote control opens, and the servomotor returns to
the 0° angle (limited by the cam with the light blue lever).
The air damper closes completely to reduce heat losses to a
minimum.
System not equipped with TR (replaced with jumper)
(Fig. 35)
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 Fig. 35).
Start-up, calibration and operation of the burner
(n° = seconds from instant 0)
2
VR
VS
3
2°
1°
0
2°
1°
0
3
0 sec
RMG LED
Off
Yellow
5.7.3

Ignition failure

If the burner does not fire, it goes into lockout within 3s of the
opening of the gas valve and within 49s of the closure of the TL
remote control (Fig. 36).
The red LED of the control box comes on.
2
VR
VS
3
2°
1°
0
2°
1°
0
3
0 sec
29 GB
NORMAL IGNITION
A
45
43
28
E
D
F
B C
A
53
46
A
Green
Red
NO IGNITION
*
43 45
46
28
*
46
20187528
*
*
G
H
Fig. 35
20187532
Fig. 36
20191053