Control Box For The Air/Fuel Ratio (Lmv 26 - Riello RLS 68/E MX Installation, Use And Maintenance Instructions

4.12 Control box for the air/fuel ratio (LMV 26...)

Important notes
To avoid accidents, material and/or environmental
damage, observe the following instructions!
The control box is a safety device! Avoid opening
WARNING WARNING
or modifying it, or forcing its operation. Riello
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 control
box, and of the positions of the fuel and/or air ac-
tuators, can cause dangerous conditions during
burner operation.
The control box is a system to check the burners, based on a mi-
croprocessor and equipped with components to adjust and su-
pervise medium and large capacity forced draught burners.
The control box 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 control box,
comply with the following instructions:
WARNING 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 control box and all
connected electric components is obtained with the correct
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 control box 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.
Technical description of the burner
13 GB
S8163
 The connections to the actuators do not provide a secure
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 control box is perfectly dry!
 Static charges must be avoided since they can damage the
control box's electronic components when touched.
 Static charges must be avoided since they can damage the
control box's electronic components when touched.
Fig. 6
20121288