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5.4
Position of electrodes (Fig. 19)
Attention: Position of electrode on the ignition pilot according to the dimensions indicated in Fig. 19.
Fig. 19
5.5
Control box for the air/fuel ratio (LMV52...)
Warning notes
Attention: To avoid injury to persons, damage to property or the environment, the following warning notes must be
observed!
The LMV52... is a safety device!
Do not open, interfere with or modify the unit.
Riello S.p.A. will not assume responsibility for any damage resulting from unauthorized interference!
Risk of explosion!
Incorrect configuration can lead to excessive fuel supply which might cause an 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 actuator positions can lead to dangerous burner operating conditions.
All activities (mounting, installation and service work, etc.) must be performed by qualified staff.
Before making any wiring changes in the connection area of the LMV52..., completely isolate the plant from mains supply (all-
polar disconnection). Ensure that the plant cannot be inadvertently switched on again and that it is indeed dead. If not obser-
ved, there is a risk of electric shock hazard.
Protection against electrical shock hazard on the LMV52... and on all connected electrical components must be ensured
through appropriate mounting.
Each time work has been carried out (mounting, installation and service work, etc.), check to ensure that wiring is in an orderly
state, that the parameters have been correctly set and make the safety checks.
Fall or shock can adversely affect the safety functions.
Such units must not be put into operation even if they do not exhibit any 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.
Like in automatic operation, the actuators are still jointly driven to their required positions. If an actuator does not reach the
required position, corrections are made until that position is 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 currently required.
This is essential for setting fuel /air ratio control. This means that during the time the fuel / air ratio curves are programmed, the
person making the plant settings must continuously monitor the quality of the combustion process (e.g. by means of a flue gas
analyzer).
Also, if combustion levels are poor, or in the event of dangerous situations, the commissioning engineer must take appropriate
action (e.g. switching off manually).
To ensure the safety and reliability of the LMV52... system, the following points must also be observed:
– Condensation and ingress of humidity must be avoided. Should such conditions occur, make sure that the unit will be completely
dry before switching on again!
– Static charges must be avoided since they can damage the unit's electronic components when touched.
CHAPTER
7 1 .5
± 1
0
1 8 .5
- 2
5
Preparation for start up
D9218
15
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