Riello RX 1500 S/E Quick start guide

Installation, use and maintenance instructions
20151518 (1) -05/2018
Premix gas burner
Progressive two-stage or modulating operation with pilot flame ignition
CODE MODEL TYPE
20148878 RX 1500 S/E S022
GB

Translation of the original instructions

1 20151518
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Contents
1 Declarations................................................................................................................................................................................ 3
2 Information and general warnings............................................................................................................................................ 4
2.1 Information about the instruction manual .................................................................................................................... 4
2.1.1 Introduction.................................................................................................................................................................. 4
2.1.2 General dangers.......................................................................................................................................................... 4
2.1.3 Other symbols ............................................................................................................................................................. 4
2.1.4 Delivery of the system and the instruction manual...................................................................................................... 5
2.2 Guarantee and responsibility....................................................................................................................................... 5
3 Safety and prevention................................................................................................................................................................ 6
3.1 Introduction.................................................................................................................................................................. 6
3.2 Personnel training ....................................................................................................................................................... 6
4 Technical description of the burner ......................................................................................................................................... 7
4.1 Models available.......................................................................................................................................................... 7
4.2 Burner categories - Countries of destination ............................................................................................................... 7
4.3 Technical data............................................................................................................................................................. 7
4.4 Electrical data.............................................................................................................................................................. 7
4.5 Burner equipment........................................................................................................................................................ 8
4.6 Maximum dimensions.................................................................................................................................................. 8
4.7 Firing rate .................................................................................................................................................................... 9
4.7.1 Commercial boilers...................................................................................................................................................... 9
4.8 Test boiler.................................................................................................................................................................... 9
4.9 Burner description ..................................................................................................................................................... 10
4.10 Control box for the air/fuel ratio (REC 27.../REC37...) .............................................................................................. 11
4.11 Operation sequence of the burner............................................................................................................................. 14
4.11.1 List of phases ............................................................................................................................................................ 15
4.12 Operator panel operation .......................................................................................................................................... 15
4.12.1 Description of the symbols on the display................................................................................................................. 15
4.12.2 Description of the buttons.......................................................................................................................................... 16
4.13 Servomotor (SQM33....) ............................................................................................................................................ 17
5 Installation ................................................................................................................................................................................ 18
5.1 Notes on safety for the installation ............................................................................................................................ 18
5.2 Handling .................................................................................................................................................................... 18
5.3 Preliminary checks .................................................................................................................................................... 18
5.4 Operating position ..................................................................................................................................................... 19
5.5 Preparing the boiler................................................................................................................................................... 19
5.5.1 Boring the boiler plate ............................................................................................................................................... 19
5.5.2 Blast tube length........................................................................................................................................................ 19
5.6 Securing the burner to the boiler............................................................................................................................... 20
5.7 Access to head internal part...................................................................................................................................... 20
5.8 Electrode and UV flame sensor positioning .............................................................................................................. 21
5.9 Gas line ..................................................................................................................................................................... 22
5.9.1 Gas train.................................................................................................................................................................... 22
5.9.2 Gas pressure............................................................................................................................................................. 23
5.10 Electrical wiring ......................................................................................................................................................... 24
5.10.1 Supply cables and external connections passage .................................................................................................... 25
5.11 Calibration of the thermal relay ................................................................................................................................. 25
6 Start-up, calibration and operation of the burner ................................................................................................................. 26
6.1 Notes on safety for the first start-up .......................................................................................................................... 26
6.2 Adjustments prior to ignition...................................................................................................................................... 26
6.3 Burner start-up .......................................................................................................................................................... 26
6.4 Burner adjustment..................................................................................................................................................... 27

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Contents
6.5 Ignition pilot adjustment .............................................................................................................................................27
6.6 Air / fuel adjustment ...................................................................................................................................................27
6.6.1 Air adjustment for maximum output ...........................................................................................................................27
6.6.2 Air/fuel adjustment and output modulation system ....................................................................................................27
6.7 Final adjustment of the pressure switches.................................................................................................................28
6.7.1 Air pressure switch.....................................................................................................................................................28
6.7.2 Maximum gas pressure switch...................................................................................................................................28
6.7.3 Minimum gas pressure switch....................................................................................................................................28
6.7.4 PVP pressure switch kit .............................................................................................................................................29
6.7.5 Air pressure switches.................................................................................................................................................29
6.8 Visualisation and programming mode........................................................................................................................30
6.8.1 Normal mode .............................................................................................................................................................30
6.8.2 Info mode ...................................................................................................................................................................31
6.8.3 Service mode .............................................................................................................................................................32
6.8.4 Parameters Mode ......................................................................................................................................................32
6.9 Parameter modification procedure.............................................................................................................................33
6.10 Start-up procedure .....................................................................................................................................................35
6.11 Backup / Restore procedure ......................................................................................................................................37
6.11.1 Backup .......................................................................................................................................................................37
6.11.2 Restore ......................................................................................................................................................................38
6.11.3 List of parameters ......................................................................................................................................................39
6.12 Operation ...................................................................................................................................................................43
6.13 Motor lockout .............................................................................................................................................................43
6.14 Ignition failure.............................................................................................................................................................43
6.15 Burner flame goes out during operation.....................................................................................................................43
6.16 Stopping of the burner ...............................................................................................................................................44
6.17 Final checks (with burner operating)..........................................................................................................................44
6.18 Monitoring system of the combustion head temperature ...........................................................................................44
7 Maintenance ..............................................................................................................................................................................45
7.1 Notes on safety for the maintenance .........................................................................................................................45
7.2 Maintenance programme ...........................................................................................................................................45
7.2.1 Maintenance frequency..............................................................................................................................................45
7.2.2 Safety test - with gas feeding closed .........................................................................................................................45
7.2.3 Checking and cleaning...............................................................................................................................................45
7.2.4 Safety components ....................................................................................................................................................46
7.2.5 Electrical current to UV sensor ..................................................................................................................................46
7.2.6 Measuring the flame signal ........................................................................................................................................46
7.2.7 UV Flame detector .....................................................................................................................................................47
7.2.8 Checking the gas pressure on the combustion head.................................................................................................47
7.3 Opening the burner ....................................................................................................................................................48
7.4 Closing the burner......................................................................................................................................................48
8 Faults - Probable causes - Solutions ......................................................................................................................................49
8.1 List of error codes ......................................................................................................................................................49
A Appendix - Accessories ...........................................................................................................................................................56
B Appendix - Electrical panel layout...........................................................................................................................................57

3 20151518
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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 burner
Model and type RX 1500 S/E S022
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/UE Low Voltage Directive
EMC 2014/30/UE 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-0085 IN PROGRESS

20151518 4
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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 of the pressure switch 5)(Fig. 5 on page 10) 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.
4.4 Electrical data
Tab. D
4 Technical description of the burner
Designation Voltage Start-up Code
RX 1500 S/E 3/400/50 Direct 20148878
Country of destination Gas category
BE I2E(R)
CY, MT I3B/P
BE I3P
LU, PL II2E3B/P
DE II2ELL3B/P
FR II2Er3P
AT, CH, CZ, DK, EE, FI, GR, HU, IS, IT, LT, NO, SE, SI, SK II2H3B/P
ES, GB, IE, PT II2H3P
NL II2L3B/P
Model RX 1500 S/E
Output (1) min - max kW 300 - 1830
Fuels Natural gas: G20 (methane)
Gas G20 pressure at max. output (2) mbar 25
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
Burner weight (without packging) kg 117
Noise levels (3) Sound pressure
Sound power dB(A) ???
Model RX 1500 S/E
Main electrical supply 3 ~ 400V +/-10% 50 Hz
Fan motor IE3
rpm
V
kW
A
2895
400
5.5
10.2
Ignition transformer V1 - V2
I1 - I2
230 V - 1 x 15 kV
0.3 A - 30 mA
Absorbed electrical power kW max 6.69
Protection degree IP44

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Technical description of the burner
4.5 Burner equipment
Thermal insulation screen . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Gasket for gas train adaptor. . . . . . . . . . . . . . . . . . . . . . . . No. 1
Adaptor for gas train. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Screws M10x40 and washers for fixing the gas train 
adaptor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 4
Pilot gas train . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Instruction booklet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Spare parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
4.6 Maximum dimensions
The maximum dimensions of the burner are given in Fig. 1.
Bear in mind that inspection of the combustion head requires the
burner to be opened and the rear part drawn back on the slide
bars.
The maximum dimensions of the open burner are indicated by
position P.
Tab. E
Tab. F
Fig. 1
PT
C
D
E
TX
N
B
H
L
G M
F
U
20151254
mm B C D E F G H L M N T TX P U
RX 1500 S/E 250 154 250 440 2” 426 660 734 308 260 946 360 885 1060
mm A B C
RX 1500 S/E 2150 1300 1070
Fig. 2
D88

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Technical description of the burner
4.7 Firing rate
The maximum output power must not be higher than the maxi-
mum limit of the diagram (Fig. 3).
The minimum output must not be lower than the minimum limit
of the diagram.
4.7.1 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.
4.8 Test boiler
The firing rate was obtained in special test boilers, according to
EN 676 regulations.
Fig. 4 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. 4, pre-
liminary checks are recommended.
ATTENTION
The firing rate (Fig. 3) was obtained considering a
room temperature of 20°C and an atmospheric
pressure of 1013 mbar (approx. 0 m above sea
level) and for a value of NOx 30 mg/m3 to 3.5%
of O2.
Fig. 3
Combustion chamber
pressure - mbar
Thermal power - kW
-2,0
-1,0
0,0
1,0
2,0
3,0
4,0
5,0
6,0
7,0
8,0
9,0
10,0
11,0
12,0
13,0
14,0
15,0
16,0
17,0
230 330 430 530 630 730 830 930 1030 1130 1230 1330 1430 1530 1630 1730 1830
S9737
Fig. 4
Combustion chamber
length - m
D715
Thermal power

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Technical description of the burner
4.9 Burner description
1 Lifting rings
2 Pilot pipe
3 Fan motor
4 Air damper servomotor
5 Combustion head gas pressure test point
6 Combustion head
7 Ignition electrode
8 Filter cover
9 Cover
10 Gas butterfly valve servomotor
11 Fan air inlet
12 Pipe coupling
13 Gasket for boiler fixing
14 Gas butterfly valve
15 Filter (accessory to be ordered separately)
16 Air 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 UV sensor
22 Sliding guides
23 Viewing port
24 O-ring and electrode seal
25 Gas train adapter
26 Thermal insulation
27 Fixing flange with insulating panel
28 Transparent protection
29 Reset button
30 Pilot pipe protection
31 Electrical control box
32 ON/OFF selector
33 Relay with clean contacts for signalling the burner is in lock-
out
34 Supply cables and external connections passage. See sec-
tion “Electrical wiring” on page 24
35 Relay with clean contacts for signalling the burner is operat-
ing
36 Auxiliary circuits fuse (includes a spare fuse)
37 Main terminal supply board
38 Ignition transformer
39 Filter pressure switches circuits fuse (includes a spare fuse)
40 Operator panel with LCD display
41 Light signalling burner lockout
42 Direct start up line contactor
43 Thermal relay (with RESET button)
44 Filter pressure switch circuits relay
45 Fixing screws for fan-manifold
46 Gas distributor
47 Air filter signals
48 Electrode connection
49 Flame inspection window
50 Control device of the combustion head temperature
Fig. 5
20151569
Detail “A”
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 20.

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Technical description of the burner
4.10 Control box for the air/fuel ratio (REC 27.../REC37...)
Important notes
All interventions (assembly and installation operations,
assistance, etc.) must be carried out by qualified personnel.
Before modifying the wiring in the control box connection
area, fully disconnect the system from the power supply
(omnipolar separation). Check the system is not powered
and cannot be accidentally reconnected. Failure to do this
will lead to the risk of electrocution.
Protection against electrocution from the control box and all
connected electric components is obtained with correct
assembly.
Before any intervention (assembly and installation opera-
tions, assistance, etc.), ensure the wiring is in order and that
the parameters are correctly set, then make 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 control curves of the air-fuel
ratio, the technician should constantly observe the quality of
the combustion process (for example, using a gas analyser)
and, if the combustion values are too low or if there are dan-
gerous conditions, take the appropriate action, for example
by manually switching off the system.
The plugs of the connection cables or other accessories can
be removed or changed when the system is off.
The connections to the actuators do not provide a safe sepa-
ration of the mains voltage. Before connecting or changing
the actuators, the system should be switched off.
To ensure the safety and reliability of the control box, the follow-
ing instructions must also be followed:
– avoid conditions that can favour the development of conden-
sate and 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.
Installation notes
Arrange the HV ignition cables separately, as far as possible
from the control box and the other cables.
Check the electric wiring inside the boiler complies with the
national and local safety regulations.
Phase and neutral should not be exchanged (cause of dan-
gerous malfunctions, loss of protection against electric
shocks, etc..).
Make certain that strain relief of the connected cables is in
compliance with the relevant standards (e.g. as per
EN60730 e EN60 335).
Ensure that spliced wires cannot get into contact with neigh-
bouring terminals. Use adequate ferrules.
The mechanical connection between the actuators and the
elements for controlling the fuel and air, or other control ele-
ments, should be rigid.
When wiring the unit, make sure that AC 230V mains volt-
age cables are run strictly separate from extra low-voltage
cables to avoid risks of electrical shock hazard.
ATTENTION
To avoid accidents, material 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!
Operators must be aware that incorrect settings
made on the display and operating unit and incor-
rect settings of the fuel and / or air actuator posi-
tions can lead to dangerous burner operating
conditions.
Fig. 6
D8266

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Technical description of the burner
Electrical connection of flame detector
It is important for signal transmission to be almost totally free
of any disturbances or loss:
always separate the detector cables from the other cables:
– line capacitance reduces the magnitude of the flame sig-
nal.
– Use a separate cable.
Respect the allowed cable lengths.
The ionisation probe is not protected against the risk of elec-
trocution; it must be protected against any accidental con-
tact.
The grounding of the burner must be in compliance with the
rules in force; the grounding of the boiler alone is not
enough.
Position the ignition electrode and the ionisation probe so
that the ignition spark cannot form an arc on the probe (risk
of electric overcharge).
Technical data
Control box Mains voltage AC 230 V -15 % / +10 %
Mains frequency 50 / 60 Hz ±6 %
Power absorption < 30 W (normal)
Safety class I, with components in compliance with II and III, ac-
cording to DIN EN 60730-1
Load on ‘input’ 
terminals
F1 unit fuse (internal) 6,3 AT
Main fuse of perm. network (external) Max. 16 AT
Undervoltage
– Safety switch-off from operating position to mains
voltage
– Restart when mains voltage picks up
< AC 186 V
> AC 195 V
Input currents and input voltages
– UeMax
–UeMin
– Iemax
–IeMin
UN +10%
UN -15%
1.5 mA peak
0.7 mA peak
Voltage detection
–On
–Off
AC 180...253 V
< AC 80 V
Load on ‘output’
terminals
Total load on the contacts
– Mains voltage
– Total unit input current (safety circuit) 
- Fan motor contactor
- Ignition transformer
- Valve
AC 230 V, 50 / 60 Hz
Max. 5 A
Single contact loading
Fan motor contactor
– Rated voltage
– Nominal current
– Power factor
AC 230 V, 50 / 60 Hz
2A
cos > 0.4
Alarm output
– Rated voltage
– Nominal current
– Power factor
AC 230 V, 50 / 60 Hz
1A
cos > 0.4
Ignition transformer
– Rated voltage
– Nominal current
– Power factor
AC 230 V, 50 / 60 Hz
2A
cos > 0.2
Fuel valve
– Rated voltage
– Nominal current
– Power factor
AC 230 V, 50 / 60 Hz
2A
cos > 0.4
Display operation
– Rated voltage
– Nominal current
– Power factor
AC 230 V, 50 / 60 Hz
0,5A
cos > 0.4

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Technical description of the burner
Tab. G
Cable lengths – Main line AC 230 V
–Display, BCI
– Load control (LR) X5-03
– External reset button
– Safety valve (SV)
– Load output
– Fuel valve
– Pilot valve
– Ignition transformer
– Other lines
Max. 100 m (100 pF / m)
For installation under the casing of the burner or in
the control panel max. 3 m (100 pF / m)
Max. 20 m (100 pF/m)
Max 20 m (100 pF/m)
Max 20 m (100 pF/m)
Max. 10 m (100 pF/m)
Max. 3 m (100 pF/m)
Max. 3 m (100 pF/m)
Max. 3 m (100 pF/m)
Max. 3 m (100 pF/m)
Cross-sections of
the power supply
lines
They should be sized for rated currents as per the pri-
mary external fuse and the fuse of the internal unit.
– Min. cross-section
– Fuses used inside the control box F1
(max. 6.3 AT)
0.75 mm²
6.3 AT DIN EN 60127 2 / 5
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, formation of ice and the entrance
of water are not permitted!

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Technical description of the burner
4.11 Operation sequence of the burner
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
Fig. 7
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
4.11.1 List of phases
4.12 Operator panel operation
The control box REC 27 .../REC37 ... is connected directly to the
operator panel (Fig. 8).
The buttons allow you to programme the operation and diagnos-
tics menus.
The burner management system is shown on the LCD display
(Fig. 9). To simplify the diagnostics, the display shows the oper-
ating status, type of problem, and when the problem arose.
4.12.1 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. 8
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. 9

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Technical description of the burner
4.12.2 Description of the buttons
Tab. H
Button Button Function
Button F
To adjust the fuel servomotor
(keep pressed and adjust the value by pressing or )
Button A
To adjust the air servomotor
(keep pressed and adjust the value by pressing or )
Buttons A and F
VSD function
To change the mode setting parameter P
(simultaneously press and plus or
Button Info and
Enter
•Enter in Parameters Mode
•Reset in the event of a lockout
• Access to a lower level of the menu
• To navigate in Mode Info or Service and permits:
- the selection of the parameter (flashing symbol)(press for <1 s)
- access to a lower level of the menu (press from 1...3 s)
- access to a higher level of the menu (press from 3...8 s)
- access to another Mode (press for > 8 s)
Button -
Lowering the value
– Access to a lower point of the modulation curve
– Scrolling the parameter list
Button +
Increasing the value
– Access to a higher point of the modulation curve
– Scrolling the parameter list
Buttons - and +
Quit function (ESC)
(press and simultaneously)
– Does not confirm the value
– Access to a higher level of the menu
F
F
A
A
VSD
AF
F
A
/reset
ESC

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Technical description of the burner
4.13 Servomotor (SQM33....)
Important notes
All interventions (assembly and installation operations,
assistance, etc.) must be carried out by qualified personnel.
Before modifying the wiring in the servomotor connection
area, fully disconnect the burner control device from the
power supply (omnipolar separation).
To avoid the risk of electrocution, protect the connection ter-
minals in a suitable manner and correctly fix the cover.
Check the wiring is in order.
Falls and collisions can negatively affect the safety func-
tions. In this case, the unit must not be operated, even if it
displays no evident damage.
Assembly notes
Check the relevant national safety standards are respected.
The connection between the actuator command shaft and
the control element must be rigid, without any mechanical
play.
To avoid an excessive load on the bearings due to rigid
hubs, the use of compensation clutches without any
mechanical play is recommended (e.g. metal bellows-type
clutches).
Installation notes
Arrange the H.V. ignition cables separately, as far as possi-
ble from the control box and the other cables.
To avoid the risk of electrocution, make sure that the 230V
AC section of the servomotor is fully separated from the
functional low-voltage section.
The static torque is reduced when the electrical supply of the
actuator is switched off.
The housing cover may only be removed for short periods of
time for wiring or when making the addressing. In similar
cases, make sure that dust or dirt does not penetrate inside
the actuator.
The servomotor comprises a PCB with ESD-sensitive com-
ponents.
The top side of the board carries a cover which affords pro-
tection against direct contact. This protective cover must not
be removed! The underside side of the board must not be
touched.
Technical data
Tab. I
ATTENTION
To avoid accidents, material or environmental
damage, observe the following instructions!
Avoid opening, modifying or forcing the servo-
motor.
ATTENTION
During the maintenance or replacement of the
servomotors, be careful not to invert the con-
nectors.
Model SQM33.5...
Operating voltage AC / DC 24V ± 20%
Safety class 2 according to EN 60 730
Power absorption Max. 10 W
Protection level IP54 in compliance with EN 60 529-1
Cable connection RAST2,5, connectors
Rotation direction - GAS servomotor: clockwise
- Air servomotor: anticlockwise
ATTENTION
The rotation direction is set in the
factory using the control box param-
eter REC ...
Rated torque (max.) 3 Nm
Static torque (max.) 3 Nm
Operation time (min.)
for 90° 5....120 s.
Weight approx. 1.4 kg
Environmental conditions:
Operation
Climatic conditions
Mechanical conditions
Temperature range
Humidity
DIN EN 60 721-3-3
Class 3K5
Class 3M4
-20...+60°C
< 95% rh
ATTENTION
Condensation, the formation of ice and the entry
of water are prohibited!
D8271 Fig. 10

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Installation
5.1 Notes on safety for the installation
After carefully cleaning all around the area where the burner is to
be installed, and arranging for the environment to be illuminated
correctly, proceed with the installation operations.
5.2 Handling
The packaging of the burner includes a wooden platform, so it is
possible to move the burner (still packaged) with a transpallet
truck or fork lift truck.
5.3 Preliminary checks
Checking the consignment
Checking the characteristics of the burner
Check the identification label of the burner (Fig. 11), showing:
A the burner model;
B the burner type;
C the cryptographic year of manufacture;
D the serial number;
E the data for electrical supply and the protection level;
F the electrical power consumption;
G the types of gas used and the relative supply pressures;
H the data of the burner's minimum and maximum output pos-
sibilities (see Firing rate). 
Warning: the burner output must be within the boiler's firing
rate.
I the category of the appliance/countries of destination.
5Installation
DANGER
All the installation, maintenance and disassembly
operations must be carried out with the electricity
supply disconnected.
ATTENTION
The installation of the burner must be carried out
by qualified personnel, as indicated in this manual
and in compliance with the standards and regula-
tions of the laws in force.
DANGER
Combustion air inside the boiler must be free from
hazardous mixes (e.g.: chloride, fluoride, halo-
gen); if present, it is highly recommended to carry
out cleaning and maintenance more frequently.
ATTENTION
The handling operations for the burner can be
highly dangerous if not carried out with the great-
est attention: keep any unauthorised people at a
distance; check the integrity and suitableness of
the available means of handling.
Check also that the area in which you are working
is empty and that there is an adequate escape
area (i.e. a free, safe area to which you can quick-
ly move if the burner should fall).
When handling, keep the load at not more than
20-25 cm from the ground.
After positioning the burner near the installation
point, correctly dispose of all residual packaging,
separating the various types of material.
CAUTION
Before proceeding with the installation operations,
carefully clean all around the area where the burn-
er will be installed.
CAUTION
After removing all the packaging, check the integ-
rity of the contents. In the event of doubt, do not
use the burner; contact the supplier.
The packaging elements (wooden cage or card-
board box, nails, clips, plastic bags, etc.) must not
be abandoned as they are potential sources of
danger and pollution; but should be collected and
disposed of in the appropriate places.
ATTENTION
A burner label, or any other component, that has
been tampered with, removed or is missing, pre-
vents the definite identification of the burner and
makes any installation or maintenance work diffi-
cult.
R.B.L.
GAS- KAASU
GAZ- AEPIO
X
RIELLO S.p.A.
I-37045 Legnago (VR)
A
DE
BC
F
I
G H
G H
Fig. 11
D10411