Fuel Change; Combustion Air Adjustment; Air/Fuel Control And Power Modulation System - Riello RLS 800/EV MX Instructions Pour Installation, Utilisation Et Entretien

6.5

Fuel change

There are three possible options for changing fuel:
1 with AZL device;
2 using selector 2) (Fig. 32);
3 using a remote selector connected to the main terminal
board.
6.6

Combustion air adjustment

Fuel/combustion air must be synchronized with the relevant ser-
vomotors (air and gas) by storing a setting curve by means of the
electronic cam.
To reduce pressure loss and to have a wider adjustment range,
it is best to set the servomotors to the maximum output used, as
near to maximum opening (90°) as possible.
On the gas butterfly valve, the fuel's partial setting adjustment
based on required output, with the servomotor fully open, is made
by using the pressure stabilizer on the gas train.
The value reported in the table can be a reference for a good
combustion setting.
6.7

Air/fuel control and power modulation system

The air/fuel and power modulation system installed on RLS burn-
er series provides, a set of integrated functions ensuring top level
energy and operational performance from the burner, both for
single and grouped burners (e.g. boiler with a double combustion
chamber or several generators in parallel).
The system includes the following basic functions:
1 air and fuels are supplied in correct quantities by positioning
the valves by direct servo-control, thus avoiding the possibil-
ity of play typical of systems used for traditional modulating
burners, in which settings are obtained by levers and a
mechanical cam;
2 the modulation of burner output, on the basis of the load
requested by the system, maintaining the pressure or tem-
perature of the boiler at the working values set;
3 a sequence (cascade control) of several boilers by suitably
connecting different units, and activation of internal software
in the individual systems (optional item).
Further interfaces and computer communication functions (for re-
mote control or integration in central supervision systems) are
available according to the system configuration.
Start-up, calibration and operation of the burner
The AZL device determines the priority fuel. The fuel selected is
shown on the display.
By setting selector 2) (Fig. 32) to EXT, you activate the remote
fuel selection facility.
In this position, if no remote selector is fitted, the display shows
the priority fuel.
EN 676
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
0 % O
2
15,2
The first start-up and all further operations con-
cerning internal settings of the control system or
expansion of basic functions, are accessed with a
password and are reserved for technical service
WARNING
personnel specifically trained for internal pro-
gramming of the instrument and for the specific
application obtained with this burner.
The first start-up and curve synchronization manual is supplied
with the burner.
The complete manual for checking and setting all parameters will
be provided on application.
29
GB
Excess air
Max output
  1,2
Calibration CO %
2
 = 1,2  = 1,3
9.7 9.0
9.5 8.8
11.6 10.7
11.4 10.5
Excess air
Max output
  1,2
Calibration CO %
2
2
 = 1,2  = 1,3
12,6 11,5
Min output
  1,3
CO
mg/kWh
 100
 100
 100
 100
Min output
  1,3
CO
mg/kWh
 100
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