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Technical description of the burner
3
3.11 Control box for the air/fuel ratio
Introduction
The control box for the air/fuel ratio (hereafter referred to simply
as the control box), that equips the burners of the RS range, car-
ries out a series of integrated functions in order to optimise
burner functioning, both for single operation and together with
other units (e.g. double furnace boiler or more than one genera-
tor at the same time).
The basic functions carried out by the control box relate to:
1. flame control;
2. the dosage of air and fuel via the positioning (with direct ser-
vocontrol) of the relative valves, excluding the possible play in
the mechanical cam calibration systems;
3. the modulation of burner output, on the basis of the load
requested by the system, maintaining the pressure or temper-
ature of the boiler at the working values set;
4. the safety diagnostic of the air and fuel circuits, via which it is
possible to easily identify any causes of malfunctioning.
Further interfaces and computer communication functions (for
remote control or integration in central supervision systems) are
available according to the system configuration.
NOTE
The first start-up, like every further operation
for the internal settings of the control box,
WARNING
requires access by means of a password and
is only to be carried out by personnel of the
Technical Assistance Service who have been
specifically trained in the internal program-
ming of the tool.
The information for the first start-up is given
below.
20022445
D8266
Technical Data
Electrical supply
Frequency
Internal fuse
Operation below the nominal value of electrical supply
Minimum operation value on reduction
of electrical supply below nominal
value
Minimum operation value on increase
in electrical supply towards nominal
value
Maximum load of the contacts:
Fan motor relay
Nominal power supply
Nominal current
Output factor
Alarm exit
Nominal power supply
Nominal current
Output factor
Ignition transformer
Nominal power supply
Nominal current
Output factor
Fuel valves
Nominal power supply
Nominal current
Output factor
Operator panel
Nominal power supply
Protection level
Input power
Length of cables
Electrical supply line AC 230 V
Display
Output regulator
Remote reset button
10
GB
Fig. 6
AC 230V - 15% /
+10%
50/60 Hz +/- 6%
6.3 A T
approx. AC 186 V
approx. AC 195 V
AC 230 V, 50/60 Hz
2 A
cos > 0.4
AC 230 V, 50/60 Hz
1 A
cos > 0.4
AC 230 V, 50/60 Hz
2 A
cos > 0.2
AC 230 V, 50/60 Hz
2 A
cos > 0.4
DC 5 V
IP 40
< 50 mW
max. 100 m (100 pF/m)
max. 3 m (100 pF/m)
max. 20 m (100 pF/m)
max. 20 m (100 pF/m)
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