Burner Ignition; Change Of Fuel; Combustion Air Adjustment - Riello RLS 1000/E FGR Installation, Use And Maintenance Instructions

6.7

Burner ignition

The burner should light after having performed the above steps.
If the motor starts up, but the flame does not appear and the con-
trol box goes into lockout, reset it and wait for a new ignition at-
tempt.
If ignition is still not achieved, it may be that gas is not reaching
the combustion head within the safety time period of 3 seconds.
In this case increase gas ignition delivery.
The arrival of gas at the sleeve is indicated by the U-type manom-
eter (Fig. 37).
If further burner lockouts occur, refer to the "Release procedure"
given in the equipment manual supplied.
6.8

Change of fuel

There are three options of change of fuel:
1 with the AZL device 4)(Fig. 36);
2 with selector 2);
3 with a remote selector connected to the main terminal
board.
6.9

Combustion air adjustment

Fuel/combustion air synchronisation is done with the relevant
servomotors (air and gas) by logging a calibration curve by
means of the electronic cam.
It is advisable, to reduce the loss and for a wide calibration field,
to adjust the servomotors to the maximum of the output used, the
nearest possible to the maximum opening (90°).
On the gas butterfly valve, fuel step according to the burner out-
put required, with servomotor completely open, is carried out by
the pressure stabiliser placed on the gas train.
The values indicated in Tab. N and Tab. O can be a reference for
a good combustion calibration.
EN 676
Max. output
Theoretical
max. CO
GAS
2
0 % O
2
G 20 11.7
G 25 11.5
G 30 14.0
G 31 13.7
EN 267
Theoretical max. CO
2
0 % O
2
15.2
20170641
Start-up, calibration and operation of the burner
Air excess
Max. output
  1.2   1.3
CO % Calibration
2
 = 1.3
 = 1.2
9.7 9
9.5 8.8
11.6 10.7
11.4 10.5
Air excess
Max. output Min. output
  1.2   1.3
CO % Calibration
2
 = 1.2  = 1.3
12.6 11.5
WARNING
DANGER
Once the burner has fired, now proceed with global calibration
operations.
The AZL device sets the priority fuel; the display shows the se-
lected fuel.
Positioning the selector 2)(Fig. 36) to "EXT" activates the remote
selection of the fuel. In this position, if there is no remote selector,
the display shows the priority fuel.
6.9.1 Air / gas adjustment and output modulation
The air/gas adjustment and output modulation system with which
the RLS range burners are equipped carries out a series of inte-
grated functions in order to optimise burner functioning, both for
single operation and together with other units (e.g. double fur-
nace boiler or more than one generator in parallel).
The basic system functions control:
1 The dosage of the air and fuel through positioning using
direct servocommands of the relevant valves eliminating the
possible play in the calibration systems with mechanical
cam lever mechanisms, used on traditional modulating
burners.
2 The modulation of the burner output in accordance with the
load required by the system, with maintenance of the pres-
CO
sure or temperature of the boiler at the operating values set.
3 The sequence (cascade adjustment) of more than one
boiler through the suitable connection of the various units
mg/kWh
and the activation of the internal software of the individual
systems (option).
 1000
Further interfaces and communication functions with computers,
 1000
for remote control or integration in central supervision systems
 1000
are available on the basis of the configuration of the system.
 1000
Tab. N
WARNING
CO
mg/kWh
The first start-up and curve synchronisation manual is supplied
with the burner.
 1000
At request, the complete manual for the control and setting of all
parameters is available.
Tab. O
34 GB
In the event of a burner lockout, more than two
consecutive burner reset operations could cause
damage to the installation. On the third lockout,
contact the Aftersales Service.
If further lockouts or burner faults occur, interven-
tions must only be made by qualified, authorised
personnel (as indicated in this manual, and in
compliance with the laws and regulations current-
ly in force).
The first start up and every further internal setting
operation of the adjustment system or the expan-
sion of the base functions require access by
means of password and are to be carried out by
service personnel who are especially trained for
the internal programming of the instrument and
the specific application created with this burner.