Combustion Air Adjustment; Air / Gas Adjustment And Output Modulation - Riello RLS 1600/E C11 Modulating Operation

6.8

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. J and Tab. K 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
20099672
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
6.8.1

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 servo commands 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
and the activation of the internal software of the individual
mg/kWh
systems (option).
Further interfaces and communication functions with computers,
 100
for remote control or integration in central supervision systems
 100
are available on the basis of the configuration of the system.
 100
 100
Tab. J
WARNING
CO
The first start-up and curve synchronisation manual is supplied
mg/kWh
with the burner.
At request, the complete manual for the control and setting of all
 100
parameters is available.
Tab. K
32 GB
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.