Control Box For The Air/Fuel Ratio (Lmv37.4 - Riello RS 70 E Installation, Use And Maintenance Instructions

3.10

Control box for the air/fuel ratio (LMV37.4...)

Warning notes
To avoid injury to persons, damage to proper-
ty or the environment, the following warning
notes must be observed!
WARNING
The LMV37.4... 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 in-
terference!
 All activities (mounting, installation and service work, etc.)
must be performed by qualified staff.
 Before making any wiring changes in the connection area,
completely isolate the plant from mains supply (all-polar dis-
connection). Ensure that the plant cannot be inadvertently
switched on again and that it is indeed dead. If not observed,
there is a risk of electric shock hazard.
 Ensure protection against electric shock hazard by providing
adequate protection for the burner control's connection termi-
nals.
 Each time work has been carried out (mounting, installation,
service work, etc.), check to ensure that wiring and parame-
ters is in an orderly state.
 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.
Introduction
The control box for the air/fuel ratio (Fig. 6), (hereafter referred to
simply as the control box), that equips the burners, carries out a se-
ries 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 generator at the same time).
The basic functions carried out by the control box relate to:
 flame control;
 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;
 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;
 the safety diagnostic of the air and fuel circuits, via which it is
possible to easily identify any causes of malfunctioning.
Mechanical design
The following system components are integrated in the
LMV37.4... basic unit:
• Burner control with gas valve proving system
• Electronic air / fuel ratio control
• Control frequency converter air fan
• Modbus interface
Technical description of the burner
Installation notes
• Always run high-voltage ignition cables separately while observ-
• Do not mix up live and neutral conductors (fire hazard, danger-
• Do not lay the connecting cable from the LMV37.4... to the
Electrical connection of the flame detectors
It is important to achieve practically disturbance- and loss-free
signal transmission:
• Never run the detector cable together with other cables.
• Observe the maximum permissible detector cable lengths.
• The ionization probe is not protected against electric shock haz-
• Locate the ignition electrode and the ionization probe such that
13
ing the greatest possible distance to the unit and to other cables.
ous failures, loss of protection against electric shock hazard,
etc.).
AZL2... together with other cables.
The first start-up, like every further operation
for the internal settings of the control box, re-
quires access by means of a password and is
WARNING only to be carried out by personnel of the Tech-
nical Assistance Service who have been speci-
fically trained in the internal programming of
the tool.
– Line capacitance reduces the magnitude of the flame signal.
– Use a separate cable.
ard. It is mainspowered and must be protected against acciden-
tal contact.
the ignition spark cannot arc over to the ionization probe (risk of
electrical overloads).
D9300
Fig. 6
20017786