Riello RX 1800 S/E Quick start guide

Installation, use and maintenance instructions
20152087 (5) - 06/2019
Premix gas burners
Progressive two-stage or modulating operation
with pilot flame ignition
CODE MODEL TYPE
20148880 RX 1800 S/E S023
20148881 RX 2500 S/E S024
20148882 RX 3000 S/E S025
CODE COMBUSTION HEAD ASSEMBLY
20151520 RX 1800 S/E
20151274 RX 2500 S/E
20151483 RX 3000 S/E
GB

Translation of the original instructions

1 20152087
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Contents
1 Declarations................................................................................................................................................................................ 3
2 Information and general warnings............................................................................................................................................ 5
2.1 Information about the instruction manual .................................................................................................................... 5
2.1.1 Introduction.................................................................................................................................................................. 5
2.1.2 General dangers.......................................................................................................................................................... 5
2.1.3 Other symbols ............................................................................................................................................................. 5
2.1.4 Delivery of the system and the instruction manual...................................................................................................... 6
2.2 Guarantee and responsibility....................................................................................................................................... 6
3 Safety and prevention................................................................................................................................................................ 7
3.1 Introduction.................................................................................................................................................................. 7
3.2 Personnel training ....................................................................................................................................................... 7
4 Technical description of the burner ......................................................................................................................................... 8
4.1 Models available.......................................................................................................................................................... 8
4.2 Burner categories - Countries of destination ............................................................................................................... 8
4.3 Technical data............................................................................................................................................................. 8
4.4 Electrical data.............................................................................................................................................................. 9
4.5 Burner weight .............................................................................................................................................................. 9
4.6 Maximum dimensions................................................................................................................................................ 10
4.7 Burner description ..................................................................................................................................................... 11
4.8 Electrical panel description........................................................................................................................................ 12
4.9 Burner equipment...................................................................................................................................................... 12
4.10 Firing rates ................................................................................................................................................................ 13
4.10.1 Commercial boilers.................................................................................................................................................... 14
4.11 Test boiler.................................................................................................................................................................. 14
4.12 Control box for the air/fuel ratio (REC 27 .../REC37 ...) ............................................................................................ 15
4.13 Operation sequence of the burner............................................................................................................................. 17
4.13.1 List of phases ............................................................................................................................................................ 18
4.14 Operator panel operation .......................................................................................................................................... 18
4.14.1 Description of the symbols on the display................................................................................................................. 18
4.14.2 Description of the buttons.......................................................................................................................................... 19
4.15 Servomotor (SQM33....) ............................................................................................................................................ 20
4.16 Calibration of the thermal relay ................................................................................................................................. 21
5 Installation ................................................................................................................................................................................ 22
5.1 Notes on safety for the installation ............................................................................................................................ 22
5.2 Handling .................................................................................................................................................................... 22
5.3 Preliminary checks .................................................................................................................................................... 22
5.4 Operating position ..................................................................................................................................................... 23
5.5 Preparing the boiler................................................................................................................................................... 23
5.5.1 Boring the boiler plate ............................................................................................................................................... 23
5.5.2 Blast tube length........................................................................................................................................................ 23
5.6 Securing the burner to the boiler............................................................................................................................... 24
5.7 Access to head internal part...................................................................................................................................... 25
5.7.1 Filter accessibility (accessory)................................................................................................................................... 25
5.8 Position of electrode - flame sensor .......................................................................................................................... 26
5.9 Gas butterfly valve..................................................................................................................................................... 26
5.10 Gas line ..................................................................................................................................................................... 27
5.10.1 Gas train.................................................................................................................................................................... 28
5.10.2 Gas train installation.................................................................................................................................................. 28
5.10.3 Gas pressure............................................................................................................................................................. 28
5.11 Electrical wiring ......................................................................................................................................................... 30
5.11.1 Supply cables and external connections passage .................................................................................................... 31

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Contents
6 Start-up, calibration and operation of the burner ..................................................................................................................32
6.1 Notes on safety for the first start-up...........................................................................................................................32
6.2 Adjustments prior to ignition.......................................................................................................................................32
6.3 Burner start-up ...........................................................................................................................................................32
6.4 Burner adjustment......................................................................................................................................................33
6.5 Ignition pilot adjustment .............................................................................................................................................33
6.6 Air / fuel adjustment ...................................................................................................................................................33
6.6.1 Air adjustment for maximum output ...........................................................................................................................33
6.6.2 Air/fuel adjustment and output modulation system ....................................................................................................33
6.7 Final adjustment of the pressure switches.................................................................................................................34
6.7.1 Air pressure switch.....................................................................................................................................................34
6.7.2 Maximum gas pressure switch...................................................................................................................................34
6.7.3 Minimum gas pressure switch....................................................................................................................................35
6.7.4 Pressure switch for the leak detection control ...........................................................................................................35
6.7.5 Air pressure switches with intake filter .......................................................................................................................35
6.8 Visualisation and programming mode........................................................................................................................36
6.8.1 Normal mode .............................................................................................................................................................36
6.8.2 Info mode ...................................................................................................................................................................37
6.8.3 Service mode .............................................................................................................................................................38
6.8.4 Parameters Mode ......................................................................................................................................................38
6.9 Parameter modification procedure.............................................................................................................................39
6.10 Start-up procedure .....................................................................................................................................................41
6.11 Backup / Restore procedure ......................................................................................................................................43
6.11.1 Backup .......................................................................................................................................................................43
6.11.2 Restore ......................................................................................................................................................................44
6.11.3 List of parameters ......................................................................................................................................................45
6.12 Operation ...................................................................................................................................................................49
6.13 Motor lockout .............................................................................................................................................................49
6.14 Ignition failure.............................................................................................................................................................49
6.15 Burner flame goes out during operation.....................................................................................................................49
6.16 Stopping of the burner ...............................................................................................................................................50
6.17 Final checks (with burner operating)..........................................................................................................................50
6.18 Monitoring system of the combustion head temperature ...........................................................................................50
7 Maintenance ..............................................................................................................................................................................51
7.1 Notes on safety for the maintenance .........................................................................................................................51
7.2 Maintenance programme ...........................................................................................................................................51
7.2.1 Maintenance frequency..............................................................................................................................................51
7.2.2 Safety test - with gas feeding closed .........................................................................................................................51
7.2.3 Checking and cleaning...............................................................................................................................................51
7.2.4 Electrical current to flame sensor...............................................................................................................................52
7.2.5 Measuring the flame signal ........................................................................................................................................52
7.2.6 Flame sensor .............................................................................................................................................................53
7.2.7 Checking the gas pressure on the combustion head.................................................................................................53
7.2.8 Safety components ....................................................................................................................................................54
7.3 Opening the burner ....................................................................................................................................................54
7.4 Closing the burner......................................................................................................................................................54
8 Faults - Probable causes - Solutions ......................................................................................................................................55
8.1 List of error codes ......................................................................................................................................................55
A Appendix - Accessories ...........................................................................................................................................................62
B Appendix - Electrical panel layout...........................................................................................................................................63

3 20152087
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Declarations
1 Declarations
Declaration of Conformity in accordance with ISO / IEC 17050-1
Manufacturer: RIELLO S.p.A.
Address: Via Pilade Riello, 7
37045 Legnago (VR)
Product: Premix gas burners
Model and type:
RX 1800 S/E
RX 2500 S/E
RX 3000 S/E
S023
S024
S025
These products are in compliance with the following Technical Standards:
EN 676
EN 12100
and according to the European Directives:
GAR 2016/426/EU Gas Appliances Regulation
MD 2006/42/EC Machine Directive
LVD 2014/35/EU Low Voltage Directive
EMC 2014/30/EU Electromagnetic Compatibility
The products are marked as follows:
The quality is guaranteed by a quality and management system certified in accordance with ISO 9001:2015.
Legnago, 21.04.2018 Executive General Manager
RIELLO S.p.A. - Burner Department
Research & Development Director
RIELLO S.p.A. - Burner Department
Mr. U. Ferretti Mr. F. Comencini
CE-0085CT0448
Manufacturer's Declaration
RIELLO S.p.A. declares that the following products comply with the NOx emission limits specified by German standard “1. BIm-
SchV revision 26.01.2010”.
Product Type Model Output
Premix gas burner S023 RX 1800 S/E 300 - 2160 kW
S024 RX 2500 S/E 365 - 2750 kW
S025 RX 3000 S/E 635 - 3570 kW
Legnago, 21.04.2018 Executive General Manager
RIELLO S.p.A. - Burner Department
Research & Development Director
RIELLO S.p.A. - Burner Department
Mr. U. Ferretti Mr. F. Comencini

20152087 4
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Declarations
Declaration of Conformity A.R. 8/1/2004 & 17/7/2009 – Belgium
Manufacturer:
RIELLO S.p.A.
37045 Legnago (VR) Italy
Tel. ++39.0442630111
www.riello.com
Distributed by:
RIELLO NV
Ninovesteenweg 198
9320 Erembodegem
Tel. [phone]
Fax. [phone]
e-mail. [e-mail]
URL. www.riello.be
This document certifies that the series of devices specified below is in compliance with the model described in the EC Declaration of
Conformity and has been manufactured and distributed in compliance with the requirements defined in the Legislative Decree of January
8th 2004 and July 17th 2009.
Type of product: Pre-mixed gas burner
Model: RX 2500 S/E
RX 3000 S/E
Regulation applied: EN 676 and A.R. of January 8th 2004 - July 17th 2009
Controlling organisation:
TÜV Industrie Service GmbH
TÜV SÜD Gruppe
Ridlerstrase, 65
80339 München DEUTSCHLAND
Values measured:
RX 1800 S/E CO max: 3 mg/kWh
RX 2500 S/E CO max: 6 mg/kWh
RX 3000 S/E CO max: 2 mg/kWh
NOx max: 78 mg/kWh
NOx max: 77 mg/kWh
NOx max: 73 mg/kWh
Legnago, 21.04.2018 Executive General Manager
RIELLO S.p.A. - Burner Department
Research & Development Director
RIELLO S.p.A. - Burner Department
Mr. U. Ferretti Mr. F. Comencini

5 20152087
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Information and general warnings
2.1 Information about the instruction manual
2.1.1 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 system. If the manual is lost or damaged, another
copy must be requested from the Technical Assistance Ser-
vice 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.
2.1.2 General dangers
The dangers can be of 3 levels, as indicated below.
2.1.3 Other symbols
Abbreviations used
Ch. Chapter
Fig. Figure
Page Page
Sec. Section
Tab. Table
2 Information and general warnings
DANGER
Maximum danger level!
This symbol indicates operations which, if not car-
ried out correctly, cause serious injury, death or
long-term health risks.
ATTENTION
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 le-
thal 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 DE-
VICES
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
machine with respect for the environment.
IMPORTANT INFORMATION
This symbol indicates important information that
you must bear in mind.
This symbol indicates a list.

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Information and general warnings
2.1.4 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 recom-
mends the drawing up of a Maintenance Contract.
2.2 Guarantee and responsibility
The manufacturer guarantees its new products from the date of
installation, 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
people, 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, incor-
rectly 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
prevent the regular development of the structurally estab-
lished 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 re-
sponsibility for the failure to observe the contents of this
manual.
.........................................................................................
.........................................................................................
.........................................................................................
.........................................................................................
ATTENTION
Failure to observe the information given in this
manual, operating negligence, incorrect installa-
tion and carrying out of non authorised modifica-
tions will result in the annulment by the
manufacturer of the guarantee that it supplies with
the burner.

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Safety and prevention
3.1 Introduction
The burners have been designed and built in compliance with
current 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, diather-
mic 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 cham-
ber and the ambient temperature must all be within the values in-
dicated in the instruction manual.
Modification of the burner to alter its performance and desti-
nations is not allowed.
The burner must be used in exemplary technical safety con-
ditions. 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.
3.2 Personnel training
The user is the person, body or company that has acquired the
machine and intends to use it for the specific purpose. He is re-
sponsible for the machine and for the training of the people work-
ing 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, the user undertakes to ensure that everyone
knows the use and safety instructions for his own duties;
Personnel must follow 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 are obliged to 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 manufacturing company
therefore accepts no responsibility whatsoever for any which
may result from the use of non-original parts.
In addition:
3 Safety and prevention
ATTENTION
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 pre-
vention 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 man-
ual.

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Technical description of the burner
4.1 Models available
Tab. A
4.2 Burner categories - Countries of destination
Tab. B
4.3 Technical data
Tab. C
(1) Reference conditions: Ambient temperature 20°C - Gas temperature 15°C - Barometric pressure 1,013 mbar - Altitude 0 m a.s.l.
(2) Pressure at the test point 5)(Fig. 4 on page 11) with zero pressure in the combustion chamber and 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 accurate “Accuracy: Category 3” measurement, as de-
scribed in EN ISO 3746.
4) With filter.
4 Technical description of the burner
Designation Voltage Start-up Code
RX 1800 S/E 3N/400/50 Direct 20148880
RX 2500 S/E 3N/400/50 Direct 20148881
RX 3000 S/E 3N/400/50 Direct 20148882
Country of destination Gas category
AT-BG-CH-CZ-DK-EE-ES-FI-GB-GR-HU-IE-IS-IT-LT-LV-NO-
PT-RO-SE-SI-SK-TR I2H
BE I2E(R)
DE-LU-PL I2E
Model RX 1800 S/E RX 2500 S/E RX 3000 S/E
Output (1) min - max kW 300 - 2160
(300 - 1960)(4) 365 - 2750 (365 - 2380)(4) 635 - 3570 (635 - 3060)(4)
Fuels Natural gas: G20 (methane)
Gas G20 pressure at max. output (2) mbar 8.9 6.9 10.9
Inlet pressure of gas train mbar 43-250 29-250 47-250
Operation FS1: Intermittent (min. 1 stop in 24 hours)
Standard applications Boilers: water, steam, diathermic oil
Ambient temperature °C 0 - 50
Combustion air temperature °C max 60
Noise levels (3) Sound pressure
Sound power dB(A) 75.1 89.0
81.4
95.4
83.3
97.4

9 20152087
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Technical description of the burner
4.4 Electrical data
Tab. D
4.5 Burner weight
The weight of the burner complete with its packaging is shown in
Tab. E.
Tab. E
Model RX 1800 S/E RX 2500 S/E RX 3000 S/E
Main electrical supply 3 ~ 400V +/-10% 50 Hz
Fan motor IE3
rpm
V
kW
A
2900
400
4.5
8.7
2935
400
5.5
10.2
2910
400
7.5
13.1
Ignition transformer V1 - V2
I1 - I2
230 V - 1 x 15 kV
0,3 A - 30 mA
Absorbed electrical power kW max 5.56 6.65 8.85
Protection degree IP54
Model kg
RX 1800 S/E (pos. 1 Fig. 1) 150
RX 2500 S/E (pos. 1 Fig. 1) 140
RX 3000 S/E (pos. 1 Fig. 1) 150
Model kg
Combustion head assembly
(pos. 2 Fig. 1) RX 1800 S/E 80
Combustion head assembly
(pos. 2 Fig. 1) RX 2500 S/E 80
Combustion head assembly
(pos. 2 Fig. 1) RX 3000 S/E 100
Fig. 1
1
2
20123805

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Technical description of the burner
4.6 Maximum dimensions
The maximum dimensions of the burner are given in Fig. 2.
Bear in mind that inspection of the combustion head requires the
burner to be opened and the rear part turned on the hinge.
The maximum dimensions of the open burner are indicated by
the L and R positions.
The l position is reference for the refractory thickness of the boiler
door.
Tab. F
Tab. G
H
O
O
L
M
PT
D
N
C
E
R2
R1
Tx
F
Tz
A
R
R
A
Fig. 2
20122705
mm A C D E F* L H M N O P R R1 R2 TTx Tz
RX 1800 S/E 1015 178 250 520 DN65 830 790 606 400 290 1178 890 506 150 1080 720 360
RX 2500 S/E 1015 178 354 520 DN65 878 790 400 400 290 1178 890 506 150 1200 840 360
RX 3000 S/E 1015 178 354 520 DN65 970 790 606 400 290 1178 890 506 150 1530 1170 360
ATTENTION
*The gas adaptor is set also for DN 80 bore.
mm A B C
RX 1800 S/E
RX 2500 S/E
RX 3000 S/E
1700 1100 1300
Fig. 3
D88

11 20152087
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Technical description of the burner
4.7 Burner description
1 Lifting rings
2Fan
3 Fan motor
4 Air damper servomotor
5 Combustion head gas pressure test point
6 Combustion head
7 Ignition electrode
8 Filter cover
9 Electrical panel casing
10 Gas butterfly valve servomotor
11 Fan air inlet
12 Pipe coupling
13 Gasket for boiler fixing
14 Gas butterfly valve
15 Filter
16 Filter pressure switch
17 Lever for controlling the dampers with graduated scale
18 Air pressure switch
19 Pilot gas train
20 Maximum gas pressure switch with pressure test point
21 Flame sensor
22 Hinge for opening the burner
23 Pressure test point for air pressure switch “+”
24 Combustion head pressure test points
25 Gas train adapter
26 Indication for checking the rotation direction of the purging
motor
27 Fixing flange with insulating panel
28 Transparent protection
29 Reset button
916
17 11 4
14
20
12
18
815
29
16 19
27
28
522
23
26
10
13
24
2
3
7
21
25
Fig. 4
20122708
The burner can be opened to the right or to the left
without links to the fuel supply side.
ATTENTION
To open the burner see section “Access to head
internal part” on page 25.

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Technical description of the burner
4.8 Electrical panel description
1 Electrical control box
2 ON/OFF selector
3 Output regulator
4 Earth terminal
5 Supply cables and external connections passage. See sec-
tion “Electrical wiring” on page 30
6 Bracket for applying the kits
7 Main terminal supply board
8 Relay with clean contacts for signalling the burner is in lock-
out
9 Relay with clean contacts for signalling the burner is operat-
ing
10 Auxiliary circuits fuse (includes a spare fuse)
11 Air pressure switch
12 Ignition transformer
13 Air filter pressure switch
14 Operator panel with LCD display
15 Light signalling burner lockout
16 Reset button
17 Direct start up line contactor
18 “Warning air filter” remote signal terminal board
19 Thermal relay (with RESET button)
20 Filter pressure switches circuits fuse (includes a spare fuse)
21 Filter pressure switch circuits relay
22 Air filter signals
23 Control device of the combustion head temperature
24 Fuse for control device of the combustion head temperature
4.9 Burner equipment
Gasket for gas train adaptor. . . . . . . . . . . . . . . . . . . . . . . . No. 1
Adaptor for gas train. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
M16x70 screws for fixing the gas train adaptor . . . . . . . . . No. 4
Thermal insulation screen . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Cable grommets kit for optional electrical wiring input . . . . No. 1
M16 nuts to fix the gas elbow to the pipe coupling . . . . . . No. 8
M16x60 Stud bolts to fix the gas elbow to the pipe coupling . .No. 1
Instruction booklet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Spare parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
1
15
16
3
7
4
4
4
5
13
24
4
4
12
17
19
5
22
14
2
6
11
8
10
23
18
21
20
9
Fig. 5
20153648

13 20152087
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Technical description of the burner
4.10 Firing rates
The maximum output must not be greater than the maximum
limit of the diagram (Fig. 6).
RX 1800 S/E = 1960 kW - with filter
RX 1800 S/E = 2160 kW - without filter
RX 2500 S/E = 2380 kW - with filter
RX 2500 S/E = 2750 kW - without filter
RX 3000 S/E = 3060 kW - with filter
RX 3000 S/E = 3570 kW - without filter
The minimum output should not be lower than the minimum limit
of the diagram (Fig. 6).
RX 1800 S/E = 300 kW
RX 2500 S/E = 365 kW
RX 3000 S/E = 635 kW
ATTENTION
The firing rate (Fig. 6) has been obtained at an
ambient temperature of 20°C, at a barometric
pressure of 1013 mbar (about 0 m a.s.l.).
Thermal power - kW
Fig. 6
Combustion head
pressure - mbar
300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700
0,0
2,0
4,0
6,0
8,0
10,0
12,0
14,0
16,0
18,0
200 1800 1900 2000 2100
2200
400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200
0,0
2,0
4,0
6,0
8,0
10,0
12,0
14,0
16,0
18,0
20,0
200 3400 3600
20151146
RX 2500 S/E
20151678
RX 1800 S/E
400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200
0,0
2,0
4,0
6,0
8,0
10,0
12,0
14,0
16,0
18,0
20,0
200 3400 3600
20151148
RX 3000 S/E
Thermal power - kW
Combustion head
pressure - mbar
Thermal power - kW
With Filter
Without Filter

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Technical description of the burner
4.10.1 Commercial boilers
The burner-boiler combination does not pose any problems if the
boiler is EC type-approved.
If, however, the burner is to be used with a commercial boiler that
has not been EC approved and/or its combustion chamber di-
mensions are distinctly smaller, consult the manufacturer.
You are advised to use this burner for boilers with a frontal circu-
lation of the flue gases.
4.11 Test boiler
The firing rate was obtained in special test boilers, according to
EN 676 regulations.
Fig. 7 indicates the diameter and length of the test combustion
chamber.
Example:
Output 756 kW (650 Mcal/h) - diameter 60 cm, length 2 m.
The coupling is ensured when the boiler is EC type-approved; for
boilers or ovens with combustion chambers of very different di-
mensions compared to those shown in the diagram of Fig. 7, pre-
liminary checks are recommended.
Fig. 7
Combustion chamber
length - m
D715
Thermal power

15 20152087
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Technical description of the burner
4.12 Control box for the air/fuel ratio (REC 27 .../REC37 ...)
Important Notes
The control box is a system to check the burners, based on a mi-
croprocessor and equipped with components to adjust and su-
pervise medium and large capacity forced draught burners.
The control box contains the following components:
– burner management system with valve leak detection control
device;
– electronic device to check the fuel/air ratio with a maximum
of 2 actuators;
– Modbus interface.
All interventions (assembly and installation operations,
assistance, etc.) must be carried out by qualified personnel.
Before carrying out any checks on the wiring, fully isolate the
system from the electric mains (omnipolar separation).
Check the system is not powered and cannot be accidentally
reconnected. Failure to do this will lead to the risk of electro-
cution.
Protection against electrocution from the control box and all
connected electric components is obtained with the correct
assembly.
After every intervention (assembly and installation opera-
tions, assistance, etc.), ensure the wiring is in order and that
the parameters are correctly set, then perform the safety
checks.
Falls and collisions can negatively affect the safety func-
tions. In this case, the control box must not be operated,
even if it displays no evident damage.
During the programming of the air-fuel ratio control curves,
the technician should constantly observe the quality of the
combustion process (for example using a gas analyser) and,
in the event of inadequate combustion values or dangerous
conditions, should take appropriate action, for example shut-
ting down the system manually.
The plugs of the connection cables or other accessories can
be disconnected when the system has been switched off.
The connections to the actuators do not provide a secure
separation from the mains voltage. Before connecting or
changing the actuators the system should be off to avoid any
conditions that could cause the formation of condensation or
humidity. Otherwise, before switching on again, make sure
that the entire control box is perfectly dry!
Static charges must be avoided since they can damage the
control box’s electronic components when touched.
Static charges must be avoided since they can damage the
control box’s electronic components when touched.
ATTENTION
To avoid accidents, material and/or environmental
damage, observe the following instructions!
The control box is a safety device! Avoid opening
or modifying it, or forcing its operation. Riello
S.p.A. cannot assume any responsibility for dam-
age resulting from unauthorised interventions!
Risk of explosion!
An incorrect configuration can provoke fuel over-
charging, with the consequential risk of explosion!
The operators must be aware that the incorrect
setting of the visualisation and operation control
box, and of the positions of the fuel and/or air ac-
tuators, can cause dangerous conditions during
burner operation.
ATTENTION
For the safety and reliability of the control box,
comply with the following instructions:
Fig. 8
D8266

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Technical description of the burner
Technical data
Tab. H
Control box Mains voltage AC 230 V -15% / +10%
Mains frequency 50 / 60 Hz ±6%
Power absorption < 30 W
Safety class I, with components in compliance with II and III, ac-
cording to DIN EN 60730-1
Load on
‘input’ terminals
Fuse on the control box (can be inspected) 6.3 AT
Undervoltage
– Safety switch-off from operating position to mains
voltage
– Restart when mains voltage picks up
< AC 186V
> AC 195V
Cable lengths – Main line AC 230 V
– Control load (TL1-TL2)
– External reset button (RS)
– Load exit (DC 0/2...10V)
– Fuel valve
– Other lines
Max. 100m (100 pF/m)
Max. 20m (100 pF/m)
Max 20 m (100 pF/m)
Max. 10m (100 pF/m)
Max. 3m (100 pF/m)
Max. 3m (100 pF/m)
Environmental 
conditions
Storage
– Climatic conditions
– Mechanical conditions
– Temperature range
– Humidity
DIN EN 60721-3-1
Class 1K3
Class 1M2
-20 ... +60 °C
< 95% RH
Transport
– Climatic conditions
– Mechanical conditions
– Temperature range
– Humidity
DIN EN 60721-3-2
Class 2K2
Class 2M2
-30 ... +60 °C
< 95% RH
Operation
– Climatic conditions
– Mechanical conditions
– Temperature range
– Humidity
DIN EN 60721-3-3
Class 3K3
Class 3M3
-20 ... +60 °C
< 95% RH
ATTENTION
Condensation, the formation of ice and the entry
of water are prohibited!

17 20152087
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Technical description of the burner
4.13 Operation sequence of the burner
Fig. 9
5 s 30 s
t1
R (ON)
LP
POC*)
M
Z
SV
V1
V2
PV
AL
0°
0°
X54
X3-05 Pin 2
X7-02 Pin 2/3
X7-01 Pin 2/3
X8-02 Pin 1/3
X6-03 Pin 2/3
X4-02 Pin 2/3
X3-05 Pin 1
X5-02 Pin 2/3
X3-04 Pin 1/2
X5-03 Pin1/4
X10-05
X3-02 Pin 1/2
X5-01 Pin 2/3
X5-01 Pin 2/3
X5-02 Pin 2/3
X9-04 Pin 2/3
X53
Pin 2/Pin 3/4
X10-06 Pin 1/2
p
P
P
P
P
S9628
Phase number
INPUT SIGNALSOUTPUT SIGNALSSERVOMOTORS
Air Fuel
Valve provingShutdown
Operation
Start-up
Timer-Resolution-Relationship
Timer 1 (parameters)
Timer 2 (parameters)
Timer 3 = phase max. time
Function
RAST plug
PIN number
RAST plug
PIN number
Signal ON
Signal OFF
Both states are allowed
Function

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Technical description of the burner
4.13.1 List of phases
4.14 Operator panel operation
The control box REC 27 .../REC37 ... is connected directly to the
operator panel (Fig. 10).
The buttons allow you to programme the operation and diagnos-
tics menus.
The burner management system is shown on the LCD display
(Fig. 11). To simplify the diagnostics, the display shows the oper-
ating status, type of problem, and when the problem arose.
4.14.1 Description of the symbols on the display
The brightness of the display can be adjusted from 0 ... 100%
with the parameter 126.
Phase Description
Ph00 Lockout phase
Ph02 Safety phase
Ph10 Closing paused
Ph12 Standby
Ph22 Fan motor(MV) = ON
Safety valve (VS) = ON
Ph24 The burner moves to the pre-purging position
Ph30 Pre-purging time
Ph36 The burner moves to the ignition position
Ph38 Ignition phase (TA) = ON
Ph39 Minimum gas pressure switch test (PGmin.)
Ph40 Fuel valve (V) = ON
Ph42 Ignition (TA) = OFF
Ph44 t44 = interval time 1
Ph60 Operation
Ph62 The burner moves to the switching off position
Ph70 t13 = post-combustion time
Ph72 The burner moves to the post-purging position
Ph74 t8 = post-purging time
Ph78 t3 = post-purging time
Ph80 Emptying time (valve leak detection)
Ph81 Atmospheric time test (valve leak control)
Ph82 Filling time (valve leak detection)
Ph83 Pressure test time (valve leak detection)
Ph90 Standby time due to lack of gas
Phase Description
ATTENTION
Observe the procedures and adjustments
shown below.
All interventions (assembly and installation
operations, assistance, etc.) must be carried
out by qualified personnel.
If the display and operator panel are dirty,
clean them with a dry cloth.
Protect the panel from excessive tempera-
tures and liquids.
D9001 Fig. 10
Lock-out lamp
Flame presence
Valve powered
Ignition transformer
Fan motor powered
Pre-heater active
Heat request
Info mode active
Service mode active
Closure of servomotors
Opening of servomotors
Unit of measurement
Lockout
Parameter mode active
only for light oil burners
Vhmin s
D9000
powered
Fig. 11