Riello RS 120/EV BLU Quick start guide

20102152 (3) - 09/2017
Installation, use and maintenance instructions
Forced draught gas burner
Progressive two-stage or modulating operation
CODE MODEL
C9343710 RS 120/EV BLU
GB

Original instructions

1 20102152
GB
Contents
1 Information and general instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Information about the instruction manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1.2 General dangers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1.3 Other symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1.4 Delivery of the system and the instruction manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Guarantee and responsibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2 Safety and prevention. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Personnel training . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Technical description of the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Electrical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.3 Burner models designation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.4 Packaging - Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.5 Burner dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.6 Burner equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.7 Firing rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.7.1 Procedure to refer burner operating condition in high altitude plants. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.8 Minimum furnace dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.9 Burner description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.10 Control box for the air/fuel ratio (LMV37.4...). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.11 Actuators (SQM33.5...) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.1 Notes on safety for the installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.2 Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.3 Preliminary checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4 Operating position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.5 Preparing the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.5.2 Boiler plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.6 Boiler fixing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.7 Securing the burner to the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.8 Electrode positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.9 Pre-calibration of combustion head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.10 Adjustment of the combustion head. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.10.1 Air adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.10.2 Gas adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.11 Burner closing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.12 Gas feeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.12.1 Gas feeding line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.12.2 Gas train. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.12.3 Gas pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.13 Electrical wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.13.1 Supply cables and external connections passage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.13.2 Cable shielding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.13.3 Installation of shielded cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.13.4 Speed sensor adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.13.5 Inverter connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.14 Motor connection at 208-230 or 460V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.15 Motor connection at 575V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.16 Reversible direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5 Start-up, calibration and operation of the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

20102152 2
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Contents
5.1 Notes on safety for the first start-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.2 Operations before start-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.3 Burner start-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.4 Adjusting gas/air delivery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.5 Final calibration of the pressure switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.5.1 Air pressure switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.5.2 Maximum gas pressure switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.5.3 Minimum gas pressure switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.6 Final checks (with the burner working) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.1 Notes on safety for the maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.2 Maintenance programme. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.2.1 Maintenance frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.2.2 Checking and cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.3 Flame signal measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.4 Opening the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.5 Closing the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
A Appendix - Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
B Appendix - Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
C Appendix - Burner start up report. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Information and general instructions
3 20102152
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1.1 Information about the instruction manual
1.1.1 Introduction
The instruction manual supplied with the burner:
is an integral and essential part of the product and must not be
separated from it; it must therefore be kept carefully for any
necessary consultation and must accompany the burner even
if it is transferred to another owner or user, or to another sys-
tem. If the manual is lost or damaged, another copy must be
requested from the Technical Assistance Service of the area;
is designed for use by qualified personnel;
offers important indications and instructions relating to the
installation safety, start-up, use and maintenance of the
burner.
Symbols used in the manual
In some parts of the manual you will see triangular DANGER signs.
Pay great attention to these, as they indicate a situation of potential
danger.
1.1.2 General dangers
The dangers can be of 3 levels, as indicated below.
1.1.3 Other symbols
Abbreviations used
Ch. Chapter
Fig. Figure
Page Page
Sec. Section
Tab. Table
1 Information and general instructions
DANGER
Maximum danger level!
This symbol indicates operations which, if not car-
ried out correctly, cause serious injury, death or
long-term health risks.
WARNING
This symbol indicates operations which, if not car-
ried out correctly, may cause serious injury, death
or long-term health risks.
CAUTION
This symbol indicates operations which, if not car-
ried out correctly, may cause damage to the ma-
chine and/or injury to people.
DANGER
DANGER: LIVE COMPONENTS
This symbol indicates operations which, if not car-
ried out correctly, lead to electric shocks with lethal
consequences.
DANGER: FLAMMABLE MATERIAL
This symbol indicates the presence of flammable
materials.
DANGER: BURNING
This symbol indicates the risks of burns due to high
temperatures.
DANGER: CRUSHING OF LIMBS
This symbol indicates the presence of moving
parts: danger of crushing of limbs.
WARNING: MOVING PARTS
This symbol indicates that you must keep limbs
away from moving mechanical parts; danger of
crushing.
DANGER: EXPLOSION
This symbol signals places where an explosive at-
mosphere may be present. An explosive atmos-
phere is defined as a mixture - under atmospheric
conditions - of air and flammable substances in the
form of gases, vapours, mist or dust in which, after
ignition has occurred, combustion spreads to the
entire unburned mixture.
PERSONAL PROTECTION EQUIPMENT
These symbols indicate the equipment that must be
worn and kept by the operator for protection against
threats against safety and/or health while at work.
OBLIGATION TO ASSEMBLE THE HOOD AND
ALL THE SAFETY AND PROTECTION DEVICES
This symbol signals the obligation to reassemble
the hood and all the safety and protection devices
of the burner after any maintenance, cleaning or
checking operations.
ENVIRONMENTAL PROTECTION
This symbol gives indications for the use of the ma-
chine with respect for the environment.
IMPORTANT INFORMATION
This symbol indicates important information that
you must bear in mind.
This symbol indicates a list.

20102152 4
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Information and general instructions
1.1.4 Delivery of the system and the instruction
manual
When the system is delivered, it is important that:
the instruction manual is delivered to the user by the system
manufacturer, with the recommendation to keep it in the room
where the heat generator is to be installed.
The instruction manual shows:
– the serial number of the burner;
– the address and telephone number of the nearest Assis-
tance Centre.
The system supplier must carefully inform the user about:
– the use of the system;
– any further tests that may be required before activating the
system;
– maintenance, and the need to have the system checked at
least once a year by a representative of the manufacturer or
another specialised technician.
To ensure a periodic check, the manufacturer recommends
the drawing up of a Maintenance Contract.
1.2 Guarantee and responsibility
The manufacturer guarantees its new products from the installation
date, in accordance with the regulations in force and/or the sales
contract. At the moment of the first start-up, check that the burner
is integral and complete.
In particular, the rights to the guarantee and the responsibility will
no longer be valid, in the event of damage to things or injury to peo-
ple, if such damage/injury was due to any of the following causes:
incorrect installation, start-up, use and maintenance of the
burner;
improper, incorrect or unreasonable use of the burner;
intervention of unqualified personnel;
carrying out of unauthorised modifications on the equipment;
use of the burner with safety devices that are faulty, incorrectly
applied and/or not working;
installation of untested supplementary components on the
burner;
powering of the burner with unsuitable fuels;
faults in the fuel supply system;
use of the burner even following an error and/or an irregularity;
repairs and/or overhauls incorrectly carried out;
modification of the combustion chamber with inserts that pre-
vent the regular development of the structurally established
flame;
insufficient and inappropriate surveillance and care of those
burner components most likely to be subject to wear and tear;
the use of non-original components, including spare parts,
kits, accessories and optional;
force majeure.
The manufacturer furthermore declines any and every respon-
sibility for the failure to observe the contents of this manual.
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WARNING
Failure to observe the information given in this
manual, operating negligence, incorrect installation
and carrying out of non authorised modifications
will result in the annulment by the manufacturer of
the guarantee that it supplies with the burner.

Safety and prevention
5 20102152
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2.1 Introduction
The burners have been designed and built in compliance with cur-
rent regulations and directives, applying the known technical rules
of safety and envisaging all the potential danger situations.
It is necessary, however, to bear in mind that the imprudent and
clumsy use of the equipment may lead to situations of death risk for
the user or third parties, as well as the damaging of the burner or
other items. Inattention, thoughtlessness and excessive confi-
dence often cause accidents; the same applies to tiredness and
sleepiness.
It is a good idea to remember the following:
The burner must only be used as expressly described. Any
other use should be considered improper and therefore dan-
gerous.
In particular:
it can be applied to boilers operating with water, steam, diathermic
oil, and to other uses expressly named by the manufacturer;
the type and pressure of the fuel, the voltage and frequency of the
electrical power supply, the minimum and maximum deliveries for
which the burner has been regulated, the pressurisation of the
combustion chamber, the dimensions of the combustion chamber
and the room temperature must all be within the values indicated in
the instruction manual.
Modification of the burner to alter its performance and destina-
tions is not allowed.
The burner must be used in exemplary technical safety condi-
tions. Any disturbances that could compromise safety must be
quickly eliminated.
Opening or tampering with the burner components is not
allowed, apart from the parts requiring maintenance.
Only those parts envisaged by the manufacturer can be
replaced.
2.2 Personnel training
The user is the person, body or company that has acquired the ma-
chine and intends to use it for the specific purpose. He is responsi-
ble for the machine and for the training of the people working
around it.
The user:
undertakes to entrust the machine exclusively to suitably
trained and qualified personnel;
undertakes to inform his personnel in a suitable way about the
application and observance of the safety instructions. With
that aim, he undertakes to ensure that everyone knows the
use and safety instructions for his own duties;
Personnel must observe all the danger and caution indications
shown on the machine.
Personnel must not carry out, on their own initiative, opera-
tions or interventions that are not within their province.
Personnel must inform their superiors of every problem or
dangerous situation that may arise.
The assembly of parts of other makes, or any modifications,
can alter the characteristics of the machine and hence com-
promise operating safety. The manufacturer therefore declines
any and every responsibility for any damage that may be
caused by the use of non-original parts.
In addition:
2 Safety and prevention
WARNING
The manufacturer guarantees safety and proper
functioning only if all burner components are intact
and positioned correctly.
the user must take all the measures necessary
to prevent unauthorised people gaining access
to the machine;
the user must inform the manufacturer if faults
or malfunctioning of the accident prevention
systems are noticed, along with any presumed
danger situation.
Personnel must always use the personal pro-
tective equipment envisaged by legislation and
follow the indications given in this manual.

20102152 6
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Technical description of the burner
3.1 Technical data
Tab. A
(1) Reference conditions: Ambient temperature 68 °F (20 °C) - Barometric pressure 394” WC - Altitude 329 ft.
(2) Pressure at test point 21)(Fig. 5), with zero pressure in the combustion chamber, with open gas ring at maximum burner output
(3) Sound pressure measured in manufacturer's combustion laboratory, with burner operating on test boiler and at maximum rated output. The sound
power is measured with the “Free Field” method, as per EN 15036, and according to an “Accuracy: Category 3” measuring accuracy, as set out in EN
ISO 3746.
3.2 Electrical data
Tab. B
3.3 Burner models designation
Tab. C
3 Technical description of the burner
Model RS 120/EV BLU
Output (1)
High MBtu/hr
kW
2282 - 4924
666 - 1443
Low MBtu/hr
kW
1136
333
• Fuel Natural gas
• Max delivery
• Pressure at maximum delivery (2)
natural gas
SCFH
“WC
4924
8.85
Operation Low - high or modulating
Standard application Boilers: water, steam, thermal oil
Ambient temperature °F 32 - 104 (0 - 40 °C)
Combustion air temperature °F max 140 (60 °C)
Noise levels (3) Sound pressure
Sound power dB(A) 77 89
Model RS 120/EV BLU
Control circuit power supply V/Ph/Hz 120/1/60
Main power supply (+/-10%) V/Ph/Hz 208-230/3/60 460/3/60 575/3/60
Fan motor IE2/EPACT tr/min
HP
V
A
3500
3
208-230
7.8
3500
3
460
3.9
3500
3
575
3.1
Ignition transformer V1 - V2
I1 - I2
120 V - 1 x 8 kV
1.6 A - 20 mA
Electrical power consumption W max 2600
Electrical control circuit consumption W750
Total electrical consumption W3350
Electrical protection NEMA 1
Model Code Code RBNA Main Voltage Flame safeguard
RS 120/EV BLU 20101539 C9343710 460/3/60 Burner mounted

Technical description of the burner
7 20102152
GB
3.4 Packaging - Weight
The packaging of the burner (Fig. 1) rests on a wooden platform
that is particularly suitable for lift trucks.
The overall dimensions of the packaging are shown in the Tab. D.
The weight of the burner complete with its packaging is shown in
Tab. D.
Tab. D
3.5 Burner dimensions
The dimensions of the burner are shown in Fig. 2.
Bear in mind that inspection of the combustion head requires the
burner to be opened and the rear part drawn back on the sliding
bars.
The dimensions of the open burner are indicated by position I.
Tab. E
3.6 Burner equipment
The burner is supplied complete with:
Gas train flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .No. 1
Flange gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .No. 1
Screws (M10 x 40) to fix the flange . . . . . . . . . . . . . . . . . . . .No. 4
Washers for screws M10 . . . . . . . . . . . . . . . . . . . . . . . . . . . .No. 4
Connector for gas pilot line. . . . . . . . . . . . . . . . . . . . . . . . . . .No. 1
Instruction manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .No. 1
Inch A B C lbs
RS 120/EV BLU 59 3/64 32 47/64 39 3/8205
D36 Fig. 1
Inch A B C D E F G H I L M N O
RS 120/EV 23 27/64 12 3/410 5/825 13/64 40 3/49 17/32 8 37/64 16 47/64 63 15/32 8 25/32 5 5/88 3/42
D731
Fig. 2

20102152 8
GB
Technical description of the burner
3.7 Firing rate
The maximum output is chosen within area A) and B)(Fig. 3) of
the diagram.
The minimum output must not be lower than the minimum limit of
the diagram.
3.7.1 Procedure to refer burner operating condition
in high altitude plants
Find the CORRECTED BURNER CAPACITY for the plant’s alti-
tude in chart 1 and the CORRECTED PRESSURE in chart 2.
Check in the firing rate graph of the burner (Fig. 3), if the working
point defined by the values above is within the range limits. If not,
higher burner size is needed.
Note
Charts are based only on altitude variation (reference tem-
perature = 68°F, 20°C)
To get the combined correction in case of different air tem-
perature, a compensation of 1000 ft each 3.6°F (305 m each
2°C) is applicable (100 ft = 0.36°F).
Example
– Rated Capacity = 2517 MBtu/hr
– Rated Air Pressure = 1.39” WC
– Reference Altitude = 328 ft
– Reference Temperature = 20°C = 68°F
– Real Altitude = 3000 ft
– Real Temperature = 17°C = 62.6°F
– Temperature Difference = 68°F - 62.6°F = 5.4°F
– Virtual Altitude Increment = 5.4°F/3.6°F x 1000 ft = 1500 ft
– Virtual Altitude = (Real Altitude) + (Virtual Altitude Increment) =
3000 ft + 1500 ft = 4500 ft
– Corrected Capacity = (2585 + 2607)/2 = 2596 MBtu/hr
– Corrected Pressure = (2.76 + 3.19)/2 = 2.98” WC
Reference conditions:
– Ambient Temperature 68 °F (20 °C)
– Barometric Pressure 394” WC (1000 mbar)
– Altitude 328 ft a.s.l. (100 m a.s.l.)
WARNING
To use area B) as well, the pre-calibration of the
combustion head is necessary, as explained in the
paragraph "Pre-calibration of combustion head"
at page 19.
WARNING
The firing rate was obtained considering a room
temperature of 68 °F and an atmospheric pressure
of 394 “WC (approx. 0 ft above sea level), with the
combustion head adjusted.
Fig. 3
20061167
Pressure in combustion
chamber - “WC
Thermal power

Technical description of the burner
9 20102152
GB
CORRECTED BURNER CAPACITY ACCORDING TO ALTITUDE
Altitude
Rated Capacity
MBtu/hr
m a.s.l. 0100 305 610 915 1220 1525 1830 2135 2440
ft a.s.l. 0328 1000 2000 3000 4000 5000 6000 7000 8000
Average barometric
pressure (20°C) mbar 1013 1000 977.4 942.8 908.2 875.8 843.5 811.85 779.8 747.8
1100 1095 1100 1111 1129 1148 1168 1190 1213 1237 1263
1533 1528 1533 1544 1562 1581 1601 1623 1646 1670 1696
1967 1962 1967 1978 1996 2015 2035 2057 2080 2104 2130
2517 2512 2517 2528 2546 2565 2585 2607 2630 2654 2680
3172 3167 3172 3183 3201 3220 3240 3262 3285 3309 3335
3700 3695 3700 3711 3729 3748 3768 3790 3813 3837 3863
4567 4562 4567 4578 4596 4615 4635 4657 4680 4704 4730
5000 4995 5000 5011 5029 5048 5068 5090 5113 5137 5163
Average barometric
pressure (68°F) “WC 399 394 385 371 358 345 332 320 307 294
1
CORRECTED BURNER AIR PRESSURE ACCORDING TO ALTITUDE
Altitude
Rated Pressure
“WC
m a.s.l. 0100 305 610 915 1220 1525 1830 2135 2440
ft a.s.l. 0328 1000 2000 3000 4000 5000 6000 7000 8000
Average barometric
pressure (20°C) mbar 1013 1000 977.4 942.8 908.2 875.8 843.5 811.85 779.8 747.8
0-0.11 00.23 0.58 0.96 1.37 1.8 2.26 2.74 3.25
0.28 0.17 0.28 0.51 0.86 1.24 1.65 2.08 2.54 3.02 3.53
0.56 0.45 0.56 0.79 1.14 1.52 1.93 2.36 2.82 3.3 3.81
0.83 0.72 0.83 1.06 1.41 1.79 2.2 2.63 3.09 3.57 4.08
1.11 11.11 1.34 1.69 2.07 2.48 2.91 3.37 3.85 4.36
1.39 1.28 1.39 1.62 1.97 2.35 2.76 3.19 3.65 4.13 4.64
1.67 1.56 1.67 1.9 2.25 2.63 3.04 3.47 3.93 4.41 4.92
1.94 1.83 1.94 2.17 2.52 2.9 3.31 3.74 4.2 4.68 5.19
2.22 2.11 2.22 2.45 2.8 3.18 3.59 4.02 4.48 4.96 5.47
2.5 2.39 2.5 2.73 3.08 3.46 3.87 4.3 4.76 5.24 5.75
Average barometric
pressure (68°F) “wc 399 394 385 371 358 345 332 320 307 294
2

20102152 10
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Technical description of the burner
3.8 Minimum furnace dimensions
The firing rate was set in relation to certified test boilers.
Fig. 4 indicates the diameter and length of the test combustion
chamber.
Example:
output 2579 Mbtu/hr - diameter 24 inch - length 6.6 ft.
Fig. 4
Length of combustion
chamber - ft
D2919

Technical description of the burner
11 20102152
GB
3.9 Burner description
1 Combustion head
2 Burner pilot
3 Screw for combustion head adjustment
4 Maximum gas pressure switch
5 Burner pilot attachment
6 Gas actuator
7 Ignition electrode
8 “KMV” relay
9 Lifting ring
10 Burner terminal board for electrical wiring “X1”
11 Operator panel with LCD display
12 Control box for checking flame and air/fuel ratio
13 Auxiliary fuse
14 Signal “CALL FOR HEAT”
15 UV flame sensor
16 Ignition transformer “TA”
17 Holes for cable grommets for electrical wiring for accesso-
ries(to be carried out by the installer)
18 Air actuator
19 Air pressure switch
20 Sliding bars for opening the burner and inspecting the com-
bustion head
21 Gas pressure test point and head fixing screw
22 Combustion head air pressure test point
23 Extension sliding bars
24 Switch “OFF - ON”
25 Fan air inlet
26 Screws to secure fan to pipe coupling
27 Switch “LOCAL REMOTE”
28 Gas butterfly valve
29 Boiler fixing flange
30 Flame stability disc
31 Horn
32 Button “ALARM SILENCE”
33 Signal “POWER ON”
34 Signal “IGNITION ON”
35 Signal “FUEL ON”
36 Signal “ALARM ON”
37 RWF55 modulator (with anolog output 4-20 mA)
38 Hight voltage lead
39 Din bar for “K7” relay and available for accessories
40 Optional holes
41 Din bar for fuse holder step-down transformer and OCI 412.10
42 Ground terminals
43 Din bar for “KMV” relay and available for accessories
44 Fan motor
45 “K1” relay
46 “K5” relay
47 “K3” relay
48 “K2” relay
49 Gas train flange
50 Air pressure switch test point
51 Variable speed sensor
52 Clamp for shielding of connection cable with inverter
53 “K7” relay
One type of burner failure may occur:
Flame safeguard lock-out: if the flame safeguard alarm
36)(Fig. 5) lights up, it indicates that the burner is in lock-out.
To reset, press the reset pushbutton.
30
2
7
1
3
21
5
50
19
12
13
41
11
10
42
24
27
32
40 33 34 14 35 36
40 23
26
6
22
29
18
9
9
23
25
42
52
38
20
45 46 47 48 37 31 39
17
17
53
43
16
4
49 28 15 44 8
51
20102981
Fig. 5

20102152 12
GB
Technical description of the burner
3.10 Control box for the air/fuel ratio (LMV37.4...)
Warning notes
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 servo-
control) 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
Installation notes
• Always run high-voltage ignition cables separately while ob-
serving the greatest possible distance to the unit and to other
cables.
• Do not mix up live and neutral conductors (fire hazard, danger-
ous failures, loss of protection against electric shock hazard,
etc.).
• Do not lay the connecting cable from the LMV37.4... to the
AZL2… together with other cables.
Electrical connection of the flame detectors
It is important to achieve practically disturbance- and loss-free sig-
nal transmission:
• Never run the detector cable together with other cables.
– Line capacitance reduces the magnitude of the flame signal.
– Use a separate cable.
• Observe the maximum permissible detector cable lengths.
• The ionization probe is not protected against electric shock
hazard. It is mainspowered and must be protected against ac-
cidental contact.
• Locate the ignition electrode and the ionization probe such that
the ignition spark cannot arc over to the ionization probe (risk
of electrical overloads).
WARNING
To avoid injury to persons, damage to property
or the environment, the following warning notes
must be observed!
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 inter-
ference!
WARNING
The first start-up, like every further operation for
the internal settings of the control box, requires
access by means of a password and is only to
be carried out by personnel of the Technical As-
sistance Service who have been specifically
trained in the internal programming of the tool.
Fig. 6
D9300

Technical description of the burner
13 20102152
GB
Technical data
Tab. F
LMV37.4... basic unit Mains voltage AC 120 V -15 % / +10 %
Mains frequency 50 / 60 Hz ±6 %
Power consumption < 30 W (typically)
Safety class I, with parts according to II and III to DIN EN 60730-1
Terminal loading
‘Inputs’
Unit fuse F1 (internally) 6.3 AT
Perm. mains primary fuse (externally) Max. 16 AT
Undervoltage
• Safety shutdown from operating position
at mains voltage
• Restart on rise in mains voltage
Approx. AC 93 V
Approx. AC 96 V
Terminal loading
‘Outputs’
Total contact loading:
• Nominal voltage
• Unit input current (safety loop) from:
- Fan motor contactor
- Ignition transformer
- Valves
- Oil pump / magnetic clutch
AC 120 V, 50 / 60 Hz
Max. 5 A
Individual contact loading:
Fan motor contactor
• Nominal voltage
• Nominal current
• Power factor
AC 120 V, 50 / 60 Hz
1.6 A pilot duty load declaration to UL372
cos > 0.4
Alarm output
• Nominal voltage
• Nominal current
• Power factor
AC 120 V, 50 / 60 Hz
1 A
cos > 0.4
Ignition transformer
• Nominal voltage
• Nominal current
• Power factor
AC 120 V, 50 / 60 Hz
1.6 A pilot duty load declaration to UL372 or 250 VA ignition
load declaration to UL372
cos > 0.2
Fuel valves
• Nominal voltage
• Nominal current
• Power factor
AC 120 V, 50 / 60 Hz
1.6 A pilot duty load declaration to UL372
cos > 0.4
Operation display
• Nominal voltage
• Nominal current
• Power factor
AC 120 V, 50 / 60 Hz
0.5 A
cos > 0.4
Cable lengths Mains line
Display, BCI
External lockout reset button
Max. 100 m (100 pF/m)
For used outside the burner cover or the control panel:
Max. 3 m (100 pF/m)
Max. 20 m (100 pF/m)
Environmental
conditions
Operation
Climatic conditions
Mechanical conditions
Temperature range
Humidity
DIN EN 60721-3-3
Class 3K3
Class 3M3
-20...+60 °C
< 95 % r.h.

20102152 14
GB
Technical description of the burner
Operation sequence of the burner
Key to the sequence diagrams:
Valve proving takes place depending on the parameter:
2) Only with valve proving on startup
3) Parameter: with/without alarm in the event of start prevention
4) In the event of an erroneous signal on startup, followed by
phase 10, otherwise phase 70
0° Position as supplied (0°)
90° Actuator fully open (90°)
Assignment of times:
t1 Prepurge time
TSA1 Safety time 1 gas / oil
TSA2 Safety time 2 gas / oil
00 02 12 22 24 30 36 38 40 42 44 50 52 60 62 70 72 74 81 82 8380
3)
4)
2)
TSA1 TSA2
t1
90
pa
T
P
P
T
P
10
Shutdown
Operation
Startup Valve proving
OUTPUTS INPUTS
Phase number
Fuel
Actuator 2
Air
Actuator 1
Actuators
Safety limit thermostat (STB)
Control thermostat or pressurestat (R)
Flame signal (FS)
Air pressure switch (LP)
Pressure switch-min (Pmin)
Pressure switch-max (Pmax)
Valve proving / leakage test (P LT)
POC (alternative to Pmax)
No-load position
Ignition load
Postpurge position
Nominal load
Low-fire
90°
0°
VSD
Motor (M)
Ignition transformer (Z)
Alarm (AL)
Safety valve (SV)
Fuel valve 1 (V1)
Fuel valve 2 (V2)
Pilot valve (PV)
No-load position
Ignition load
Postpurge position
Nominal load
Low-fire
90°
0°
No-load position
Ignition load
Postpurge position
Nominal load
Low-fire
90°
0°
Fig. 7
D9288
Signal ON
Signal OFF
Any signal is allowed
In standby: after referencing, the actuator is driven to the
no-load position

Technical description of the burner
15 20102152
GB
3.11 Actuators (SQM33.5...)
Warning notes
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 units, completely isolate the equipment from mains supply
(all-polar disconnection). If not observed, there is a risk of
electric shock hazard.
Ensure protection against electric shock hazard by providing
adequate protection for the connection terminals and by
securing the housing cover.
After any kind of activity (mounting, installation and service
work, etc.), check wiring.
Also ensure that the parameters are correctly set.
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.
Use
The actuators (Fig. 8) are used to drive and position the air damper
and the gas butterfly valve, without mechanical leverages but via
the interposition of an elastic coupling.
They are commanded by the control box, which constantly checks
their position by means of a return signal from the optic sensor in-
side the actuator.
The position (in degrees) of the actuators can be seen on the dis-
play of the Operator Panel.
Index “0” for fuel actuator, index “1” for air actuator.
Installation notes
• Always run the high-voltage ignition cables separate from the
unit and other cables while observing the greatest possible dis-
tance.
• The holding torque is reduced when the actuator is disconnect-
ed from power.
Technical data
Tab. G
WARNING
To avoid injury to persons, damage to property
or the environment, the following warning notes
should be observed!
Do not open, interfere with or modify the actua-
tors!
WARNING
The actuator’s housing must not be opened.
The actuator contains an optical feedback sys-
tem.
WARNING
When servicing or replacing the actuators, take
care not to invert the connectors.
Operating voltage AC / DC 24 V ±20%
(load on interface)
Safety class 2 to EN 60 730 part 1 and parts 2…14
Power consumption max. 10 W
Degree of protection IP54 to EN 60 529-1
Opening time 0 - 90° min: 5s, max.: 120s
(depending on the type of control box)
Firing rate 0 - 90°
Cable connection RAST2,5 connectors
Direction of rotation Clockwise/anticlockwise
(can be selected from the control box)
Nominal output torque 3 Nm
Holding torque
(when live) 3 Nm
Holding torque
(when dead) 2.6 Nm
Weight approx. 1 kg
Environmental conditions:
Operation
Climatic conditions
Mechanical conditions
Temperature range
Humidity
DIN EN 60 721-3-3
class 3K5
class 3M4
-20...+60 ×C
< 95 % r.h.
D8271
Fig. 8

20102152 16
GB
Installation
4.1 Notes on safety for the installation
After carefully cleaning all around the area where the burner will
be installed, and arranging the correct lighting of the environ-
ment, proceed with the installation operations.
4.2 Handling
The packaging of the burner includes a wooden platform, so it is
possible to move the burner (still packaged) with a transpallet
truck or fork lift truck.
With regard to the transport in the obligatory passages, refer to
the overall dimensions shown in Fig. 2 at page 7.
Check also that the area in which you are working is empty and that
there is an adequate escape area (i.e. a free, safe area to which
you can quickly move if the burner should fall).
During the handling, keep the load at not more than 10” from the
ground.
4.3 Preliminary checks
Checking the consignment
4Installation
DANGER
All the installation, maintenance and disassembly
operations must be carried out with the electricity
supply disconnected.
WARNING
The installation of the burner must be carried out by
qualified personnel, as indicated in this manual and
in compliance with the standards and regulations of
the laws in force.
WARNING
The handling operations for the burner can be high-
ly dangerous if not carried out with the greatest at-
tention: keep any unauthorised people at a
distance; check the integrity and suitableness of the
available means of handling.
CAUTION
After positioning the burner near the installation
point, correctly dispose of all residual packaging,
separating the various types of material.
Before proceeding with the installation operations,
carefully clean all around the area where the burner
will be installed.
CAUTION
After removing all the packaging, check the integrity
of the contents. In the event of doubt, do not use the
burner; contact the supplier.
The packaging elements (wooden cage or card-
board box, nails, clips, plastic bags, etc.) must not
be abandoned as they are potential sources of dan-
ger and pollution; they should be collected and dis-
posed of in the appropriate places.
WARNING
The output of the burner must be within the boiler's
firing rate;
WARNING
A burner label that has been tampered with, re-
moved or is missing, along with anything else that
prevents the definite identification of the burner
makes any installation or maintenance work diffi-
cult.

Installation
17 20102152
GB
4.4 Operating position
4.5 Preparing the boiler
4.5.1 Introduction
The burners are suitable for working on both flame inversion
boilers (*) (in this case the long head model is recommended) and
boilers with a combustion chamber with bottom runoff (three
flue gas circulations), from which the best results of low NOx
emissions are obtained.
The maximum thickness of the front hatch of the boiler A)(Fig. 10),
complete with refractory, must not exceed 8” max.
(*) For flame inversion boilers, a kit is available to reduce the CO,
if necessary. See Accessories.
The kit consists of 5 gas tubes, identical to the other 5 already
present in the burner head. In standard conditions, the head of
the burner is fitted with a second group of tubes, from which
the gas emerges in a different direction compared with the oth-
ers.
With the kit, this second group of tubes is substituted so that all
the tubes are the same.
After assembling the kit, check its efficiency by measuring the
flue gases and CO.
4.5.2 Boiler plate
Make holes in the plate shutting off the combustion chamber, as il-
lustrated in Fig. 11.
The position of the threaded holes can be marked using the ther-
mal insulation screen supplied with the burner.
Tab. H
WARNING
The burner is designed to operate only in posi-
tions 1, 2, 3 and 4 (Fig. 9).
Installation 1 is preferable, as it is the only one
that allows the maintenance operations as
described in this manual.
Installations 2, 3 and 4 permit operation but
make maintenance and inspection of the com-
bustion head more difficult.
DANGER
Any other position could compromise the cor-
rect operation of the appliance.
Installation 5 is prohibited for safety reasons.
2 3 4 51
Fig. 9
D7739
inch A B C
RS 120/EV 9 1/16 12 25/32 - 14 1/25/8 W
Fig. 10
8” max
D1079
Fig. 11
D455

20102152 18
GB
Installation
4.6 Boiler fixing
Secure the burner to the boiler, fixing the flange 9)(Fig. 12) to the
boiler plate and interposing the insulating gasket 8).
Use the 4 screws, with a tightening torque of 26-29 Lbf. ft, after pro-
tecting their thread with anti-seize products.
• For boilers with front flue passes 13)(Fig. 12) or flame inversion
chambers, a protection in refractory material 11) must be in-
serted between the boiler refractory 12) and the blast tube 10).
This protection must not compromise the extraction of the blast
tube.
• For boilers with a water-cooled frontal, a refractory lining is not
necessary 11)-12)(Fig. 12) unless expressly requested by the
boiler manufacturer.
4.7 Securing the burner to the boiler
Detach the combustion head from the burner, (Fig. 12):
loosen the 4 screws 3) and remove the cover 1);
remove the screws 2) from the slide bars 5);
remove the 2 screws 4) and pull the burner back on slide bars
5) by about 4”;
install the extension bars 15) and re-screw the screws 2)
including the safety plate 16);
disconnect the electrode wires and then pull the burner com-
pletely off the slide bars.
WARNING
The seal between burner and boiler must be airtight;
after the start-up, check there is no leakage of flue
gases into the external environment.
Provide an adequate lifting system of the burner.
12
11
10
15
2
1
3
4
4"
5
13
13
9
16
Fig. 12
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