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3.12 Flame control (LMV52...)
Warnings
To avoid accidents, material or environmental
damage, observe the following instructions!
The LMV52... flame control is a safety device!
WARNING
Avoid opening or modifying it, or forcing its opera-
tion. Riello S.p.A. cannot assume any responsibil-
ity for damage resulting from unauthorised
interventions!
Risk of explosion!
An incorrect configuration can provoke fuel over-
charging, with the consequential risk of explosion!
Operators must be aware that incorrect settings
made on the AZL5... display and operating unit
and incorrect settings of the fuel and / or air actu-
ator positions can lead to dangerous burner oper-
ating conditions.
All interventions (assembly and installation operations,
assistance, etc.) must be carried out by qualified personnel.
Before modifying the wiring in the LMV52... flame control
connection area, fully disconnect the system from the power
supply (omnipolar separation). Check the system is not pow-
ered and cannot be accidentally reconnected. Failure to do
this will lead to the risk of electrocution.
Protection against electrocution from the LMV5... and all
connected electric components is obtained with correct
assembly.
Before any intervention (assembly and installation opera-
tions, assistance, etc.), ensure the wiring is in order and that
the parameters are correctly set, then make the safety
checks.
Falls and collisions can negatively affect the safety func-
tions.
In this case, the must not be operated, even if it displays no
evident damage.
In programming mode, the position check of actuators and
VSD (checking electronic fuel / air ratio control) is different
from the check during automatic operation. As for automatic
operation, the actuators are guided together to the positions
requested and, if an actuator does not reach the position
requested, adjustments are made until the position is actu-
ally reached. However, in contrast to automatic operation,
there are no time limits to these corrective actions. The other
actuators maintain their positions until all actuators have
reached
the
positions
This is absolutely important to set the fuel / air ratio control
system.
During the time the fuel / air ratio curves are being pro-
grammed, the person making the plant settings must continu-
ously monitor the quality of the combustion process (e.g. by
means of a flue gas analyser). Also, if combustion levels are
poor, or in the event of dangerous situations, the commis-
sioning engineer must take appropriate action (e.g. switch-
ing off manually).
To ensure the safety and reliability of the LMV5... system, the fol-
lowing instructions must also be followed:
–
avoid conditions that can favour the development of conden-
sate and humidity. Otherwise, before switching on again,
make sure that the entire is perfectly dry!
–
Static charges must be avoided since they can damage the
's electronic components when touched.
20205796
Technical description of the burner
Mechanical structure
The LMV5... is a system to check the burners, based on a micro-
processor and equipped with components to adjust and monitor
medium and large capacity forced draught burners.
The base of the LMV5... system incorporates the following com-
ponents:
•
•
•
•
currently
required.
14
GB
Burner adjustment device with system for checking the seal
of the gas valves
Electronic fuel/air ratio monitoring device with a maximum of
6 (LMV52...) actuators
Optional PID temperature / pressure controller (load control-
ler)
Optional VSD module Mechanical design.
D9301
Fig. 9
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