Riello RX 300 S/PV Quick start guide

20062175 (3) - 02/2015
Installation, use and maintenance instructions
Premixed gas burners
Progressive two-stage or modulating operation
CODE MODEL
20064445 RX 180 S/PV
20055507 RX 250 S/PV
20060003 RX 300 S/PV
20059983 RX 300-33 S/PV
GB

Original instructions

1 20062175
GB
Contents
1 Information and general warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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
1.2.1 Owner’s responsibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Safety and prevention. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Personnel training . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Technical description of the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Electrical data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Packaging - weight - Approximate measurements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.4 Burner dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.5 Burner description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.6 Burner equipment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.7 Firing rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.8 Burner controls (LME71...) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.8.1 Indication of diagnostics mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1 Notes on safety for the installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2 Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.3 Preliminary checks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.4 Operating position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.5 Preparing the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.5.1 Boring the boiler plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.5.2 Head length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.6 Probe - electrodes positioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.7 Securing the burner to the boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.8 Fuel supply. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.8.1 Air/gas mixer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.8.2 Gas train. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.9 Electrical wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.9.1 Supply cables and external connections passage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.9.2 Opening sequence of the fuse-holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5 Start-up, calibration and operation of the burner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.1 Notes on safety for the first start-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.2 Adjustments before first firing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.3 Burner start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.4 Fan adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.5 Matching the working points “Speeds for low-fire (P1), ignition load (P0) and high-fire (P2) for the heating engineer . .
to the application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6 Burner shut down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.7 Gas valve adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.8 Burner adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.8.1 Optimum calibration values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.9 Check of modulating operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

20062175 2
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Contents
5.9.1 Display of preset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.9.2 Load controller inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.10 Factory wiring diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.1 Notes on safety for the maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.2 Maintenance programme. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.2.1 Maintenance frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.2.2 Checking and cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
6.3 Recommended preventive maintenance schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.4 Opening and closing the burner. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
7 Operation, indication, diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
7.1 Control sequence in the event of fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
7.2 Fault status messages, display of errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
7.2.1 Display of errors (faults) with lockout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
7.3 Error code list with operation via internal LED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
7.4 Resetting the burner control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
7.5 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
7.5.1 Manual adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
7.5.2 Diagnostics of cause of fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
7.5.3 First startup with a new program module or in case of replacement of program module . . . . . . . . . . . . . . . . . . . . . . 45
7.6 Manual restore. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
7.6.1 Errors during the restore process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.6.2 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
A Appendix - Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
B Appendix - Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
C Appendix - Burner start up report. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Information and general warnings
3 20062175
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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 warnings
WARNING
Read these instructions and save for reference!
These installation and operating instructions form
part of the unit and must kept in good and legible-
conditions on site at all times.
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 COVER AND
ALL THE SAFETY AND PROTECTION DEVICES
This symbol signals the obligation to reassemble
the cover 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.

20062175 4
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Information and general warnings
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 date of installation;
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 date of in-
stallation, 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;
continuation of use of the burner when a fault has occurred;
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;
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 man-
ual, operating negligence, incorrect installation and
carrying out of non authorised modifications will re-
sult in the annulment by the manufacturer of the
guarantee that it supplies with the burner.

Information and general warnings
5 20062175
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1.2.1 Owner’s responsibility
Please pay attention to the Safety Warnings contained within
this instruction manual. Keep this manual for your records and
provide it to your quali fi ed service agency for use in profession-
ally setting up and maintaining your burner.
Your burner will provide years of ef fi cient operation if it is pro-
fessionally installed and maintained by a qualifi ed service tech-
nician. If at any time the burner does not appear to be operating
properly, immediately contact your qualifi ed service agency for
consultation.
We recommend annual inspection/service of your gas heating
system by a qualifi ed service agency.
Failure to follow these instructions, misuse, or incorrect adjust-
ment of the burner could lead to equipment malfunction and re-
sult in asphyxiation, explosion or fire.
WARNING
If you smell gas:
Do not touch any electrical items.
Open all windows.
Close all gas supply valves.
Contact your local gas authority immediately.
• Do not store flammable or hazardous materials
in the vicinity of fuel burning appliances.
• Improper installation, adjustment, alteration,
service or maintenance can cause property
damage, personal injury or death.
• Refer to this manual for instructional or addition-
al information.
• Consult a certified installer, service representa-
tive or the gas supplier for further assistance.
• Burner shall be installed in accordance with
manufacturers requirements as outlined in this
manual, local codes and authorities having ju-
risdiction.
WARNING
CANADA: The equipment shall be installed in ac-
cordance with the Provincial Installation Require-
ments, or in their absence, the CAN/CGA B149.1 &
B149.2 Installation Codes shall prevail. Authorities
having jurisdiction should be consulted before in-
stallation is made.
USA: This burner must conform with local codes,
or, in the absence of local codes, with the Standard:
National Fuel Gas Code NFPA 54/ANSI Z223.1 or
International Fuel Gas Code, as appropriate.
If an external electrical source is utilized, the con-
version burner, when installed, must be electrically
grounded in accordance with local codes or, in the
absence of local codes, with the national Electrical
Code, ANSI/NFPA No. 70-1990 and CSA Electrical
Code C22.2 No.0 M1982 & C22.2 No 3. 1988. Au-
thorities having jurisdiction should be consult-
ed before installations are made. The owner is
required to retain this manual for future refer-
ence.

20062175 6
GB
Safety and prevention
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 foreseen 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.
must take all the measures necessary to pre-
vent 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.

Technical description of the burner
7 20062175
GB
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 6)(Fig. 3 at page 9) with zero pressure in the combustion chamber and maximum burner output.
(3) Sound pressure measured in manufacturer’s combustion laboratory, with burner operating on test boiler and at maximum rated output.
3.2 Electrical data
Tab. B
3 Technical description of the burner
Model RX 180 S/PV RX 250 S/PV RX 300 S/PV RX 300-33 S/PV
Output (1)
Delivery (1)
max. MBtu/hr
kW
585
177
800
242
1100
333
1220
370
min. MBtu/hr
kW
100
30
150
45
160
48
180
55
Fuel
- max. delivery
- gas head pressure at max. delivery (2)
- supply pressure
type
SCFH
“ wc
“ wc
Natural Gas
550
-8.25
4 - 14
Natural Gas
550
-10.3
4 - 14
Natural Gas
550
-7.45
4 - 14
Natural Gas
550
-6.8
4 - 14
Fuel
- max. delivery
- gas head pressure at max. delivery (2)
- supply pressure
type
SCFH
“ wc
“ wc
Propane
220
-12.5
4 - 14
Propane
220
-13.8
4 - 14
Propane
220
-9.4
4 - 14
Propane
220
-8.5
4 - 14
Operation Low - high or modulating
Standard applications Boilers: water, steam, thermal oil
Ambient temperature °F 32 - 104 (0 - 40 °C)
Combustion air temperature °F max 140 (60 °C)
Noise levels (3) dB(A) -- -- -- --
Model RX 180 S/PV RX 250 S/PV RX 300 S/PV RX 300-33 S/PV
Control circuit power supply V/Ph/Hz 115/1/50-60
Main power supply (+/- 10%) V/Ph/Hz 115/1/50-60
Fan motor rpm
V
HP
A
5730
115
0.46
4.0
Ignition transformer V1 - V2
I1 - I2
120 V - 2 x 12 kV
0.51 A - 30 mA
Electrical power consumption W345
Electrical control circuit consumption W max 110
Total electrical consumption W455
Electrical protection NEMA 1

20062175 8
GB
Technical description of the burner
3.3 Packaging - weight - Approximate measurements
The packaging of the burner (Fig. 1) rests on a wooden platform
that is particularly suitable for lift trucks. The dimensions of the
packaging are shown in the Tab. C.
The weight of the burner complete with its packaging is shown in
Tab. C.
Tab. C
3.4 Burner dimensions
The maximum dimensions of the burner are given in Fig. 2.
Tab. D
inch A B C lbs
All models 28 3/4“ 18 3/4“ 15 43/64“ 66
Fig. 1
D88
Fig. 2
20061952
inch A B C E F G H I L M N
All models 17 7/16“ 15 25/64“ 32 1/16“ 14 47/64“ 18 17/64“ 12 19/32“ 4 11/16“ 12 1/32“ 16 25/64“ 20 5/64“ 38 3/64“

Technical description of the burner
9 20062175
GB
3.5 Burner description
1 Combustion head
2 Ignition electrode
3 Flame sensor probe
4 Gas valve
5 Air/gas mixer in the suction line circuit - Venturi
6 Gas pressure test point
7 Gas valve conduit
8 Gas input
9 Boiler fixing flange
10 Fan
11 Air passage in fan
12 Control box with lockout pilot light
13 Reset button
14 Plug-socket on ionisation probe cable
15 Terminal board
16 Transformer
17 Safety shut off valve
18 Fuse-holder
19 Program module
Burner lockout may occur:
control box lockout
If the push-button 13)(Fig. 3) lights up, it indicates that the
burner is in lockout. Press the push button to reset.
3.6 Burner equipment
Flange fixing screws M 5 x 20 - groover washer and
flanged nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .No. 4
Insulating gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .No. 1
Instruction booklet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .No. 1
Hardware for burner assembly:
8 x 50 stainless steel nuts (with or without point) . . . . . . . . . .No. 4
M8 nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .No. 4
Gas pipe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .No. 1
Air/gas compensation pipe . . . . . . . . . . . . . . . . . . . . . . . . . . .No. 1
Combustion Head. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .No. 1
Electrode assemby. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .No. 1
Protection assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Label “Tested” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
12
19
6
17
15
18 11
16
12
3
9
5
14
8
4
7
13 10
Fig. 3
20061959
WARNING
The equipment shall be installed in accordance with
the Provincial Installation Requirements, or in their
absence, the CGA B149.1 and B149.2 Installation
Codes shall prevail. Authorities having jurisdiction
should be consulted before installations are made.
The owner is required to retain this manual for fu-
ture reference.

20062175 10
GB
Technical description of the burner
3.7 Firing rates
During operation, burner output varies between:
•aMAXIMUM OUTPUT, which must not be greater than the
maximum limit given on the diagram,
•andaMINIMUM OUTPUT, which must not be lower than the
minimum limit in the diagram.
NOTE:
The FIRING RATE value range has been obtained considering an
ambient temperature of 68 °F (20 °C), and an atmospheric pres-
sure of 394” WC.
The FIRING RATE areas given in Fig. 6 have been reduced by
10% with respect to the maximum range that can be reached.
Fig. 4
Chamber pressure (‘WC)
Input (MBtu/h)
20064447
RX 180 S/PV
NOX < 30 ppm
NOX < 20 ppm
NOX < 9 ppm
Ignition
NOx expected emissions on Natural Gas
(expressed in ppm@3% O2)
Riello Burners Sub 30 Sub 20 Sub 9
Model CO2(%) O2(%) CO2(%) O2(%) CO2(%) O2(%)
RX 180 S/PV 8.5~8.75 5.8~5.4 8.0~8.5 6.7~5.8 7.25~7.75 8.0~7.1

Technical description of the burner
11 20062175
GB
During operation, burner output varies between:
•aMAXIMUM OUTPUT, which must not be greater than the
maximum limit given on the diagram,
• and a MINIMUM OUTPUT, which must not be lower than the
minimum limit in the diagram.
NOTE:
The FIRING RATE value range has been obtained considering an
ambient temperature of 68 °F (20 °C), and an atmospheric pres-
sure of 394” WC.
The FIRING RATE areas given in Fig. 5 have been reduced by
10% with respect to the maximum range that can be reached.
Tab. E
Fig. 5
Chamber pressure (‘WC)
Input (MBtu/h)
20062032
RX 250 S/PV
NOX < 30 ppm
NOX < 20 ppm
NOX < 9 ppm
Ignition
NOx expected emissions on Natural Gas
(expressed in ppm@3% O2)
Riello Burners Sub 30 Sub 20 Sub 9
Model CO2(%) O2(%) CO2(%) O2(%) CO2(%) O2(%)
RX 250 S/PV 8.5~8.75 5.8~5.4 8.0~8.5 6.7~5.8 7.25~7.75 8.0~7.1

20062175 12
GB
Technical description of the burner
During operation, burner output varies between:
•aMAXIMUM OUTPUT, which must not be greater than the
maximum limit given on the diagram,
• and a MINIMUM OUTPUT, which must not be lower than the
minimum limit in the diagram.
NOTE:
The FIRING RATE value range has been obtained considering an
ambient temperature of 68 °F (20 °C), and an atmospheric pres-
sure of 394” WC.
The FIRING RATE areas given in Fig. 6 have been reduced by
10% with respect to the maximum range that can be reached.
Tab. F
Fig. 6
Chamber pressure (‘WC)
Input (MBtu/h)
20063370
RX 300 S/PV
RX 300-33 S/PV
NOX < 30 ppm
NOX < 20 ppm
NOX < 9 ppm
Ignition
NOx expected emissions on Natural Gas
(expressed in ppm@3% O2)
Riello Burners Sub 30 Sub 20 Sub 9
Model CO2(%) O2(%) CO2(%) O2(%) CO2(%) O2(%)
RX 300 S/PV
RX 300-33 S/PV 8.5~8.75 5.8~5.4 8.0~8.5 6.7~5.8 7.25~7.75 8.0~7.1

Technical description of the burner
13 20062175
GB
3.8 Burner controls (LME71...)
Warning notes
All activities (mounting, installation and service work, etc.)
must be performed by qualified personnel.
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 (e. g. with dummy plugs for inputs and outputs not used).
If not observed, there is a risk of electric shock hazard.
The space where the program module (Fig. 8) is located is
defined as plugging space and therefore back-off-hand-proof
when the program module is not fitted.
If the housing or the area near the operating panel is dam-
aged, the unit must immediately be put out of operation. If not
observed, there is a risk of electric shock hazard.
Press the buttons on the operating panel only manually with-
out using any tools or pointed objects. If the film of the operat-
ing panel is damaged, there is a risk of electric shock hazard.
To ensure safety and reliability of the LME71... system, the follow-
ing 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! If not observed,
there will be a risk of electric shock.
– Static charges must be avoided since they can damage the
unit’s electronic components when touched.
Program module
Mounting notes
Ensure that the relevant national safety regulations are com-
plied with
The LME7... basic unit must be secured with fixing screws M4
(UNC32) or M5 (UNC24), observing a maximum tightening
torque of 1.8 Nm and using all 3 fixing points.
The additional mounting surfaces on the housing are provided
to improve mechanical stability.
These must fully rest on the mounting surface to which the unit
is secured.
The flatness of that mounting surface must be within a toler-
ance band of 0.3 mm.
WARNING
To avoid injury to persons, damage to property or
the environment, the following warning notes must
be observed!
The LME71... are safety devices! Do not open, in-
terfere with or modify the unit.
Riello S.p.A. does not assume responsibility for
damage resulting from unauthorized interference!
Additional safety notes contained in other chapters
of this document must be observed as well!
WARNING
Only qualified personnel are allowed to install and
operate the equipment.
Qualified personnel in the context of the safety-re-
lated notes contained in this document are persons
who are authorized to commission, ground and tag
devices, systems and electrical circuits in compli-
ance with established safety practices and stan-
dards.
WARNING
Condensation, formation of ice and ingress of water
are not permitted!
If not observed, there is a risk of impairment of safe-
ty functions and of electric shock hazard.
Fig. 7
S8593
Fig. 8
S8673

20062175 14
GB
Technical description of the burner
Installation notes
Always run the high-voltage ignition cable separate from the
unit and other cables while observing the greatest possible
distance.
Do not mix up live and neutral conductors.
Install switches, fuses and earthing in compliance with local
regulations.
The connection diagrams show the burner controls with
earthed neutral conductor.
Make certain that the maximum permissible current rating of
the connection terminals is not exceeded.
Make certain that strain relief of the connected cables is in
compliance with the relevant standards.
Do not feed external mains voltage to the control outputs of
the unit. When testing the devices controlled by the burner
control (fuel valves, etc.), the LME71… must not be connected
to the units.
The mechanical coupling between the actuators and the con-
trolling elements for fuel and air, or any other controlling ele-
ments, must be rigid.
Check the connecting lines of the air pressure switch for short-
circuits.
Electrical connection of 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 permissible detector cable lengths (see Technical
Data).
The mains-powered ionization probe is not protected against
electric shock hazard.
Locate the ignition electrode and the ionization probe such
that the ignition spark cannot arc over to the ionization probe
(risk of electrical overloads) and that it cannot adversely affect
the supervision of ionization.
Description of display and buttons
Tab. G
Button Function
Button A
– Display preset output
– In lockout position: power value to the time of
fault
Info and Enter Button
The lockout reset button (info button) is the key op-
erating element for resetting the burner control and
for activating/deactivating the diagnostics func-
tions.
- Button
– Display flame signal current 2 or phases dis-
play
– In lockout position: MMI phase to the time of
fault
+ Button
– Display flame signal current 1 or phases dis-
play
– In lockout position: MMI phase to the time of
fault
3 multicolor signal lamp
The multicolor signal lamp (red - yellow - green) is
the key indicating element for visual diagnostics.
+ and - Button: escape function
Press + and - button simultaneously!
– No adoption of value
– One menu level up
– Keep depressed for >1second for backup/re-
store function
nfo
+
-
A
Fig. 9
S8595
A
nfo
-
+
- +
and

Technical description of the burner
15 20062175
GB
Technical data
Tab. H
LME71... burner con-
trols
Mains voltage AC 120 V
Mains frequency 50 / 60 Hz
Power consumption <10 W, typical
External primary fuse Max. 6.3 A (slow)
Safety class I with parts according to II and III to DIN EN 60730-1
Terminal rating
“Inputs”
Under voltage UMains 120 V
• Safety shutdown from the operating position takes
place should mains voltage drop
• Restart is initiated when mains voltage exceeds
< AC 75 V
> AC 100 V
Input currents and input voltages
–UeMax
–UeMin
– IeMax
–IeMin
UN +10%
UN -15%
1.5 mA peak (peak value)
0.8 mA peak (peak value)
Voltage detection
–ON
–OFF
> AC 60 V
< AC 40 V
Terminal rating
“Outputs”
Total contact loading:
Rated voltage
Unit input current X3-04 (safety loop) from:
– fan motor contactor
– ignition transformer
– fuel valves
AC 120 V - 50/60 Hz
Max. 5 A
Individual contact loading:
Fan motor contactor X2-01 pin 3
– Rated voltage
– Rated current
– Power factor
AC 120 V 50/60 Hz
2 A (15A max. 0.5 s)
Cosϕ≥ 0.4
Alarm output X2-03/3
– Rated voltage
– Rated current
– Power factor
AC 120 V 50/60 Hz
1 A
Cosϕ> 0.6
Ignition transformer X4-02 pin 3
– Rated voltage
– Rated current
– Power factor
AC 120 V 50/60 Hz
2 A
Cosϕ> 0.4
Auxiliary output
– Rated voltage
– Rated current
– Power factor
AC 120 V 50/60 Hz
1 A
Cosϕ> 0.6
Output relay contact 2 pin 2 X2-09 pin 7
– Rated voltage
– Rated current
– Power factor
AC 120 V 50/60 Hz
1 A
Cosϕ> 0.4
Fuel valves/pilot valve X7-01 pin 3
– Rated voltage
– Rated current
– Power factor
AC 120 V 50/60 Hz
1 A
Cosϕ> 0.4
Safety valve X6-03 pin 3
– Rated voltage
– Rated current
– Power factor
AC 120 V 50/60 Hz
1.5 A
Cosϕ> 0.6
Cable lengths Mains supply line Max. 100 m (100 pF/m)
Cross-sectional
areas
The cross-sectional areas of the mains power lines (L, N, and PE) and, if required, the safety loop (safety limit
thermostat, water shortage, etc.) must be sized for rated currents according to the selected external primary
fuse. The cross-sectional areas of the other cables must be sized in accordance with the internal unit fuse (max.
6.3 AT).
Environmental
conditions
Operation
Climatic conditions
Mechanical conditions
Temperature range
Humidity
DIN EN 60721-3-3
Class 3K3
Class 3M2
-40...+60 °C
<95% r.h.

20062175 16
GB
Technical description of the burner
Program sequence
M
Z
V1
V2
AL
K1X2-02 Pin 3
Sp e e d p o i n t s
P2 ( h ig h - re)
P0 (ignition load)
P1 ( l o w -r e)
0 (no-load speed)
R
LR-OPEN
LR-CLOSE
Op t i o n al (LP)
if P235=1
Pm i n
P LT
ION / QRA
Not act ive
X3-04 Pin 5
Re l a y
con tact Function/inputs
Operating unit parameter number
LED permanent
LED ashing
t w t 11 t 10 t 12 t 3 t 3n t 4
St an db y St ar t up Operat io n Shu t do wn Valve proving
if parameter
P241 =1 (ON)
Can b e
parameterized
t 1 TSA
432752622062522952
Re l a y
con t act Function/outputs
SK
X3-04 Pin 1
X5-03 Pin 1
X5-03 Pin 3
X65 Pin 1
X5-03 Pin 2
X65 Pin 1
X3-02 Pin 1
X5-01 Pin 2
X2-02 Pin 4
X9-04 Pin 2
PWM
K1X6-03 Pin 3
K4X2-01 Pin 3
K5X4-02 Pin 3
K7X7-04 Pin 4
X7-01 Pin 3
K2/ 1X2-03 Pin 3
Ph ase n u m b e r
382818080147274424048363030322422212 oP: xx (act ual load in %) 74
224
t11 t8
POC
POC
St a n d b y
speed
Prepurg e speed
Ignition load speed
High-re speed
Modulation range
Low-re speed
Po st p u r ge sp e ed Purge sp eed
242 243 244 245240240240240240240
*1
*2
td4 td1 td3 td2
Fig. 10
S8594

Technical description of the burner
17 20062175
GB
Key Fig. 10:
Tab. I
Times
Tab. J
AL Alarm device
AUX Auxiliary output
Dbr Wire link
Lockout reset button (info button)
EK2 Remote lockout reset button
FSV Flame signal amplifier
ION Ionization probe
K... Relay contact
LED 3-color signal lamp
LP Air pressure switch
LR Load controller
LR-OPEN Load controller OPEN position
LR-CLOSE Load controller CLOSED position
MFan motor
NT Power supply unit
P LT Pressure switch valve proving
Pmax Pressure switch-max
Pmin Pressure switch-min
POC Proof of closure
PV Pilot valve
QRA... UV flame detector
RControl thermostat or pressurestat
SA Actuator
SA-KL Actuator low-fire
SA-NL Actuator high-fire
SA-R Actuator feedback
SA-Z Actuator CLOSED
SA-ZL Actuator ignition load
SL Safety loop
STB Safety limit thermostat
SV Safety valve
V1 Fuel valve
V2 Fuel valve
V2a Fuel valve
WLimit thermostat or pressure switch
ZIgnition transformer
µC µC controller
Input/output signal 1 (ON)
Input/output signal 2 (OFF)
Input permissible signal 1 (ON) or 0 (OFF)
/re set
(EK1)
TSA Safety time
tw Waiting time
t1 Prepurge time
t3 Preignition time
t3n Postignition time (P257 +0.3 seconds)
t4 Interval: end of safety time load controller
release
t5 Interval: Pilot valve OFF - load controller
release
t8 Postpurge time
t10 Specified time air pressure switch state mes-
sage (timeout)
t11 Opening time of actuator (timeout)
t12 Closing time of actuator (timeout)
td1 Test atmospheric pressure
td2 Test gas pressure
td3 Test space filling
td4 Test space evacuating

20062175 18
GB
Technical description of the burner
Key to Phases (Fig. 10, page 16):
Tab. K
3.8.1 Indication of diagnostics mode
Both lockout reset button and signal lamp are located in the control
panel.
There are 2 diagnostics choices:
1 Visual diagnostics: Indication of operating state or diagnostics
of cause of fault
2 Diagnostics: Via BCI to AZL2... display and operating unit
Visual diagnostics:
in normal operation, the different operating states are indicated in
the form of color codes according to the color code table given be-
low (Tab. L).
Indication of operating state
During startup, state indication takes place according to the Tab. L:
Tab. L
Key (Tab. L)
Phase
number Function
LOC Lockout shutdown phase
OFF Standby, waiting for heat request
oP Part 1: request load controller OPEN
Part 2: modulation of fan motor speed toward high-fire
Part 3: high-fire reached
Part 4: request load controller CLOSED
Part 5: modulation of fan motor speed toward low-fire
Part 6: low-fired reached
10 Settling time, fan motor standby speed
21 Safety valve ON, air pressure switch in no-load posi-
tion
Check if POC is closed, fan motor speed is reduced to
0
22 Part 1: fan motor ON
Part 2: specified time air pressure switch
Message (timeout), stabilization of air pressure switch
24 Settling time, fan motor prepurge speed
30 Part 1: prepurge time without flame simulation test
Part 2: prepurge time with flame simulation test
(2.1 seconds)
36 Speed settling time, fan motor ignition load speed
38 Preignition time
40 Postignition time, parameter 257 + 0.3 seconds
42 Flame detection
44 Interval: end of ignition safety time and release of load
controller
72 Speed stabilization time, fan motor postpurge speed
74 Part 1: operation is ended, check if postpurging is pro-
grammed
Part 2: postpurge time
80 Test space is evacuated
81 Atmospheric pressure test
82 Test space is filled
83 Gas pressure test
90 Pressure switch-min open --> safety shutdown
*1 Valve proving, if P241 = 1 after main ON, lockout or
P234 (postpurge time) = 0 second
*2 Valve proving, if P241 = 1 and P234 (postpurge time)
>0 second
The lockout reset button (info button) is the key op-
erating element for resetting the burner control and
for activating/deactivating the diagnostics func-
tions.
The multicolor signal lamp is the key indicating el-
ement for visual diagnostics.
Color code table for multicolor signal lamp
State Color code Color
Waiting time,
other waiting states OFF
Ignition phase,
ignition controlled
Blinking
yellow
Operation, flame o.k. Green
Operation,
flame not o.k.
Blinking
green
Extraneous light on
burner startup Green - Red
Undervoltage Yellow - Red
Fault, alarm Red
Error code output (see
Error code Tab. AA,
page 44)
Blinking red
Interface diagnostics Red flicker
light
Heating request Yellow
New program card Yellow
Yellow - Red
nfo
Red
Yellow
Green
LED
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Red
Yellow
Green
........
OFF
Steady on