Riello RL 70 - Fault Diagnostics and Resetting

29
2916456
GB
Start-up, calibration and operation of the burner
7.3.2 Steady state operation
System equipped with one control device TR
Once the starting cycle has come to an end, the command of the
2nd stage solenoid valve passes on to the control device TR that
controls boiler temperature or pressure.
• When the temperature or the pressure increases until the con-
trol device TR opens, solenoid valve 11) closes, and the burn-
er passes from the 2nd to the 1st stage of operation.
• When the temperature or pressure decreases until the control
device TR closes, solenoid valve 11) opens, 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. In this
case, the control device TL opens, and solenoid valves 8)-16)
close, the flame immediately goes out. The fan's air gate valve
closes completely.
Systems not equipped with control device TR (jumper wire
installed)
The burner is fired as described in the case above. If the temper-
ature or pressure increase until control device TL opens, the
burner shuts down (Section A-A in the diagram).
When the solenoid valve 11) de-energizes, the piston 12) closes
the passage to the 2nd stage nozzle and the fuel contained in the
cylinder 15), piston B, is discharged into the return piping 7).
7.3.3 Firing failure
If the burner does not fire, it goes into lock-out within 5 s of the
opening of the 1st nozzle valve and 30 s after the closing of con-
trol device TL.
The control box red pilot light will light up.
7.3.4 Undesired shutdown during operation
If the flame goes out during operation, the burner shuts down au-
tomatically within 1 second and automatically attempts to start
again by repeating the starting cycle.
7.3.5 Final checks
• Obscure the photocell and switch on the control devices: the
burner should start and then lock-out about 5 s after opening
of the 1st stage operation valve.
• Illuminate the photocell and switch on the control devices: the
burner should start and then go into lock-out after about 10 s.
• Obscure the photocell while the burner is in 2nd stage opera-
tion, the following must occur in sequence: flame extinguished
within 1 s, pre-purging for about 20 s, sparking for about 5 s,
burner goes into lock out.
• Switch off control device TL followed by control device TS
while the burner is operating: the burner should stop.
7.4 Burner start-up cycle diagnostics
During start-up, indication is according to the Tab. O:
Tab. O
7.5 Resetting the control box and using diagnostics
The control box features a diagnostics function through which
any causes of malfunctioning are easily identified (indicator: RED
LED).
To use this function, you must wait at least 10 seconds once it
has entered the safety condition (lockout), and then press the re-
set button.
The control box generates a sequence of pulses (1 second
apart), which is repeated at constant 3-second intervals.
Once you have seen how many times the light pulses and identi-
fied the possible cause, the system must be reset by holding the
button down for between 1 and 3 seconds.
The methods that can be used to reset the control box and use
diagnostics are given below.
Sequences Colour code
Pre-purging

Ignition phase

Operation, flame ok

Operating with weak flame signal

Electrical supply lower than ~ 170V

Lock-out

Extraneous light

Key:  Off  Yellow Green  Red
RED LED on
wait at least 10s
Lock-out
Press reset
for > 3s
Pulses
Interval
3s
Pulses
 