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3.12 Control box for the air/fuel ratio (REC 27 ...)
Warnings
To avoid accidents, material and/or environmental
damage, observe the following instructions!
The flame control is a safety device! Avoid open-
ing or modifying it, or forcing its operation. Riello
WARNING
S.p.A. cannot assume any responsibility for dam-
age resulting from unauthorised interventions!
Risk of explosion!
An incorrect configuration can provoke fuel over-
charging, with the consequential risk of explosion!
The operators must be aware that the incorrect
setting of the visualisation and operation flame
control, and of the positions of the fuel and/or air
actuators, can cause dangerous conditions during
burner operation.
The flame control is a system to check the burners, based on a
microprocessor and equipped with components to adjust and su-
pervise medium and large capacity forced draught burners.
The flame control contains the following components:
–
burner management system with valve leak detection control
device;
–
electronic device to check the fuel/air ratio with a maximum
of 2 actuators;
–
Modbus interface.
For the safety and reliability of the flame control,
comply with the following instructions:
WARNING
all interventions (assembly and installation operations,
assistance, etc.) must be carried out by qualified personnel.
Before carrying out any checks on the wiring, fully isolate the
system from the electric mains (omnipolar separation).
Check the system is not powered and cannot be accidentally
reconnected. Failure to do this will lead to the risk of electro-
cution.
Protection against electrocution from the flame control and
all connected electric components is obtained with the cor-
rect assembly.
After every intervention (assembly and installation opera-
tions, assistance, etc.), ensure the wiring is in order and that
the parameters are correctly set, then perform the safety
checks.
Falls and collisions can negatively affect the safety func-
tions. In this case, the flame control must not be operated,
even if it displays no evident damage.
During the programming of the air-fuel ratio control curves,
the technician should constantly observe the quality of the
combustion process (for example using a gas analyser) and,
in the event of inadequate combustion values or dangerous
conditions, should take appropriate action, for example shut-
ting down the system manually.
The plugs of the connection cables or other accessories can
be disconnected when the system has been switched off.
20205255
Technical description of the burner
The connections to the actuators do not provide a secure
Static charges must be avoided since they can damage the
Static charges must be avoided since they can damage the
14
GB
D8266
separation from the mains voltage. Before connecting or
changing the actuators the system should be off to avoid any
conditions that could cause the formation of condensation or
humidity. Otherwise, before switching on again, make sure
that the entire flame control is perfectly dry!
flame control's electronic components when touched.
flame control's electronic components when touched.
Fig. 9
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