Riello RX 70 S/PV Quick start guide

20144769 (2) - 08/2019
Installation, use and maintenance instructions
Instructions pour installation, utilisation et entretien
Premix gas burners
Brûleurs de gaz pré-mélangé
Progressive two-stage or modulating operation
Fonctionnement à deux allures progressives ou modulant
CODE - CODE MODEL - MODELE TYPE
20140590 RX 70 S/PV -
20144823 RX 70 S/PV 901T2
GB
F

Translation of the original instructions
Traduction des instructions d’origine

1 20144769
GB
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 Burner equipment ........................................................................................................................................................... 8
4.4 Technical data ................................................................................................................................................................ 9
4.5 Electrical data ................................................................................................................................................................. 9
4.6 Maximum dimensions................................................................................................................................................... 10
4.7 Burner description......................................................................................................................................................... 11
5 Installation ................................................................................................................................................................................ 12
5.1 Notes on safety for the installation................................................................................................................................ 12
5.2 Handling........................................................................................................................................................................ 12
5.3 Preliminary checks........................................................................................................................................................ 12
5.4 Operating position......................................................................................................................................................... 13
5.5 Generator plate............................................................................................................................................................. 13
5.6 Securing the burner to the boiler .................................................................................................................................. 13
5.7 Positioning probe - electrodes ...................................................................................................................................... 14
5.8 Positioning the diaphragm (LPG operation).................................................................................................................. 14
5.9 Fuel supply ................................................................................................................................................................... 15
5.9.1 Gas train assembly....................................................................................................................................................... 16
5.9.2 Gas valve...................................................................................................................................................................... 16
5.10 Electrical connections................................................................................................................................................... 17
5.10.1 Testing.......................................................................................................................................................................... 17
5.10.2 Ionisation current .......................................................................................................................................................... 17
6 Start-up, calibration and operation of the burner ................................................................................................................. 18
6.1 Notes on safety for the first start-up.............................................................................................................................. 18
6.2 Adjustments prior to ignition ......................................................................................................................................... 18
6.3 Burner start-up.............................................................................................................................................................. 18
6.4 Fan adjustment............................................................................................................................................................. 18
6.5 Gas valve adjustment ................................................................................................................................................... 19
6.6 Burner adjustment ........................................................................................................................................................ 19
6.6.1 Maximum output ........................................................................................................................................................... 19
6.6.2 Minimum output ............................................................................................................................................................ 19
6.6.3 Ignition output ............................................................................................................................................................... 19
6.7 Combustion head.......................................................................................................................................................... 20
6.8 Operating programme................................................................................................................................................... 21
6.8.1 Normal operation .......................................................................................................................................................... 21
6.8.2 Lock-out because of no ignition.................................................................................................................................... 22
6.8.3 Lockout due to a flame or flame simulation detected during pre-purging ..................................................................... 22
6.9 Recycle function if flame goes out during operation ..................................................................................................... 23
6.10 Restart function following firing failure .......................................................................................................................... 23
6.11 Control of the motor rpm............................................................................................................................................... 23

20144769 2
GB
Contents
6.12 Control box reset (using built-in button) ........................................................................................................................23
6.13 Control box reset (using remote connection) ................................................................................................................23
7 Maintenance ..............................................................................................................................................................................24
7.1 Notes on safety for the maintenance.............................................................................................................................24
7.2 Maintenance programme ..............................................................................................................................................24
7.2.1 Maintenance frequency.................................................................................................................................................24
7.2.2 Safety test - with no gas supply.....................................................................................................................................24
7.2.3 Checking and cleaning ..................................................................................................................................................24
7.2.4 Safety components........................................................................................................................................................25
7.3 Opening and closing the burner ....................................................................................................................................25
7.4 Recommended preventive maintenance programme ...................................................................................................26
8 Faults / Solutions ......................................................................................................................................................................27
8.1 Start-up problems..........................................................................................................................................................27
8.2 Operating faults.............................................................................................................................................................28
A Appendix - Electrical panel layout...........................................................................................................................................29

3 20144769
GB
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: Pre-mixed gas burners
Model and type: RX 70 S/PV 901T2
These products are in compliance with the following Technical Standards:
EN 12100
EN 676
and according to the European Directives:
GAR 2016/426/UE Gas Devices Regulation
MD 2006/42/EC Machine Directive
LVD 2014/35/UE Low Voltage Directive
EMC 2014/30/UE Electromagnetic Compatibility
Such products are marked as follows:
The quality is guaranteed by a quality and management system certified in accordance with ISO 9001:2015.
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.rielloburners.com
Distributed by:
RIELLO NV
Ninovesteenweg 198
9320 Erembodegem
Tel. [phone]
Fax. [phone]
e-mail. [email protected]e
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 70 S/PV
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: Max. CO: 20 mg/kWh
Max. NOx: 58.2 mg/kWh
Legnago, 21.04.2018 General Manager
RIELLO S.p.A. - Burners Department
Research and Development Director
RIELLO S.p.A. - Burners Department
Eng. U. Ferretti Eng. F. Comencini
EC-0085BR0101 Class 3 (EN 676) (type 901T2 only)

20144769 4
GB
Declarations
Manufacturer's Declaration
RIELLO S.p.A. declares that the following products comply with the NOx emission limits specified by German standard
“1. BImSchV revision 26.01.2010”.
Product Type Model Output
Pre-mixed gas burner 901T2 RX 70 S/PV 10 - 40 kW
Legnago, 21.04.2018 General Manager
RIELLO S.p.A. - Burners Department
Research and Development Director
RIELLO S.p.A. - Burners Department
Eng. U. Ferretti Eng. F. Comencini

5 20144769
GB
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
Centre 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
carried out correctly, cause serious injury, death
or long-term health risks.
ATTENTION
This symbol indicates operations which, if not
carried out correctly, may cause serious injury,
death or long-term health risks.
CAUTION
This symbol indicates operations which, if not
carried out correctly, may cause damage to the
machine and/or injury to people.
DANGER
DANGER: LIVE COMPONENTS
This symbol indicates operations which, if not
carried out correctly, lead to electric shocks with
lethal consequences.
DANGER: FLAMMABLE MATERIAL
This symbol indicates the presence of flammable
materials.
DANGER: BURNING
This symbol indicates the risks of burns due to
high temperatures.
DANGER: CRUSHING OF LIMBS
This symbol indicates the presence of moving
parts: danger of crushing of limbs.
WARNING: MOVING PARTS
This symbol indicates that you must keep limbs
away from moving mechanical parts; danger of
crushing.
DANGER: EXPLOSION
This symbol signals places where an explosive
atmosphere may be present. An explosive
atmosphere is defined as a mixture - under
atmospheric conditions - of air and flammable
substances in the form of gases, vapours, mist or
dust in which, after ignition has occurred,
combustion spreads to the entire unburned
mixture.
PERSONAL PROTECTION EQUIPMENT
These symbols indicate the equipment that must
be worn and kept by the operator for protection
against threats against safety and/or health while
at work.
OBLIGATION TO ASSEMBLE THE COVER
AND ALL THE SAFETY AND PROTECTION
DEVICES
This symbol signals the obligation to reassemble
the cover and all the safety and protection devices
of the burner after any maintenance, cleaning or
checking operations.
ENVIRONMENTAL PROTECTION
This symbol gives indications for the use of the
machine with respect for the environment.
IMPORTANT INFORMATION
This symbol indicates important information that
you must bear in mind.
 This symbol indicates a list.

20144769 6
GB
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
Assistance Centre
The system supplier must carefully inform the user about:
– the use of the system;
– any further tests that may be required before activating the
system;
– maintenance, and the need to have the system checked at
least once a year by a representative of the manufacturer
or another specialised technician.
To ensure a periodic check, the manufacturer
recommends the drawing up of a Maintenance Contract.
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,
incorrectly applied and/or not working;
installation of untested supplementary components on the
burner;
powering of the burner with unsuitable fuels;
faults in the fuel supply system;
continuation of use of the burner when a fault has occurred;
repairs and/or overhauls incorrectly carried out;
modification of the combustion chamber with inserts that
prevent the regular development of the structurally
established flame;
insufficient and inappropriate surveillance and care of those
burner components most likely to be subject to wear and
tear;
use of non-original components, including spare parts, kits,
accessories and optional;
force majeure.
The manufacturer furthermore declines any and every
responsibility for the failure to observe the contents of this
manual.
.........................................................................................
.........................................................................................
.........................................................................................
.........................................................................................
ATTENTION
Failure to observe the information given in this
manual, operating negligence, incorrect
installation and carrying out of non authorised
modifications will result in the annulment by the
manufacturer of the guarantee that it supplies with
the burner.

7 20144769
GB
Safety and prevention
3.1 Introduction
The burners have been designed and built in compliance with
current regulations and directives, applying the known safety
technical rules 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
confidence 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
dangerous.
Specifically:
it can be applied to boilers operating with water, steam,
diathermic oil, and to other uses expressly named by the
manufacturer;
the type and pressure of the fuel, the voltage and frequency of the
electrical power supply, the minimum and maximum deliveries for
which the burner has been regulated, the pressurisation of the
combustion chamber, the dimensions of the combustion
chamber and the ambient temperature must all be within the
values indicated in the instruction manual.
Modification of the burner to alter its performance and
destinations is not allowed.
The burner must be used in exemplary technical safety
conditions. 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
responsible for the machine and for the training of the people
working around it.
The user:
undertakes to entrust the machine exclusively to suitably
trained and qualified personnel;
undertakes to inform his personnel in a suitable way about
the application and observance of the safety instructions.
With that aim, the user undertakes to ensure that everyone
knows the use and safety instructions for his own duties;
Personnel must observe all the danger and caution
indications shown on the machine.
Personnel must not carry out, on their own initiative,
operations or interventions that are not within their province.
Personnel must inform their superiors of every problem or
dangerous situation that may arise.
The assembly of parts of other makes, or any modifications,
can alter the characteristics of the machine and hence
compromise operating safety. The manufacturer therefore
declines any and every responsibility for any damage that
may be caused by the use of non-original parts.
In addition:
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
prevent unauthorised people gaining access
to the machine;
the user must inform the manufacturer if
faults or malfunctioning of the accident
prevention systems are noticed, along with
any presumed danger situation;
personnel must always use the personal
protective equipment envisaged by legislation
and follow the indications given in this
manual.

20144769 8
GB
Technical description of the burner
4.1 Models available
4.2 Burner categories - Countries of destination
Tab. A
4.3 Burner equipment
Gas valve fitting + screws . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Insulating flange gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
7-pin plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Screws and nuts for fixing the flange to the boiler . . . . . . . No. 4
Diaphragm for LPG operation . . . . . . . . . . . . . . . . . . . . . . No. 1
Instruction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Spare Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
4 Technical description of the burner
Designation Voltage Code External modulation
RX 70 S/PV 230V - 50-60 Hz 20140590 0-10 V
RX 70 S/PV 230V - 50-60 Hz 20144823 3 points
Country of destination Gas category
AT-CH-CZ-ES-FR-GB-GR-IE-IT-LT-PT-RO-SI-SK-IS II2H3P
NL II2EK3P
LU I2E
DE-PL I2E/I3P
HU I2H/I3P
BE I2E(R),I3P
BG-DK-EE-FI-LV-NO-SE I2H
CY-MT I3P

9 20144769
GB
Technical description of the burner
4.4 Technical data
Tab. B
(1) Reference conditions: Ambient temperature 20°C - Gas temperature 15°C - Barometric pressure 1013 mbar - Altitude 0 m a.s.l.
(2) Pressure at the socket P1) 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 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 described in
EN ISO 3746.
4.5 Electrical data
Tab. C
Model RX 70 S/PV
Code 20140590 20144823
Power (1) Min. kW
Kcal/h
10
8,600
Max. kW
Mcal/h
40
34,400
Fuel Natural gas: G20-G25 (methane) - LPG: (G31)
Supply pressure (2) - mbar 15-30
Gas valve input diameter 1/2”
Operation – Intermittent (min. 1 stop in 24 hours).
– Modulating
Standard applications Boilers: water, steam, diathermic oil
Ambient temperature °C 0 - 40
Combustion air temperature °C max 60
Burner operating temperature °C 0 - 60
Weight kg 9
Noise levels (3) Sound pressure
Sound power dB(A) 62.8 74.7
Model RX 70 S/PV
Electric power supply 230V ~ +/-10% 50 Hz
Fan motor rpm
W
V
A
8500
135
230 V 50 Hz
1.6
Ignition transformer Prim.
Sec.
220/240 V - 50/60 Hz 17 VA
15 kV 250 mA 200 Hz
Absorbed electric power W max 235 W
Protection level IP20
ATTENTION
The requested protection level must be reached
on the application.

20144769 10
GB
Technical description of the burner
4.6 Maximum dimensions
The dimensions of the burner are given in Fig. 1.
Note that to inspect the combustion head the burner must be
removed through the boiler door.
Tab. D
Tab. E
PT
TX
E
D
L
H
Fig. 1
20152779
mm H L P T TX D E
RX 70 S/PV 280 320 325 212 125 54 210
mm A B C
RX 70 S/PV 590 395 305
Fig. 2
D88

11 20144769
GB
Technical description of the burner
4.7 Burner description
1 Reset button with lock-out signal
2 Control box
3Gas valve
4 Air/gas mixer in intake circuit
5 Flange
6 Motor/Fan
7 Combustion head with metal mesh
8 Ignition transformer
9 Adjustment No. of fan turns
10 7-pole socket
11 Terminal board
12 Manifold
13 Ignition electrode
14 Flame detection probe
20152785
758911
1
2
RESET
ALARM
3
13
14
6
12 4
10
Fig. 3
ATTENTION
Burner lockout may occur.
CONTROL BOX LOCKOUT:
if the button 1) lights up (Fig. 3) it signals that the
burner is in lockout.
Press the push button to reset.

20144769 12
GB
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 burner packaging includes a wooden platform, it is therefore
possible to handle the burner (still packaged) with a pallet 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. 4), showing:
the model A) and type of burner B);
the year of manufacture, in cryptographic form C);
the serial number D);
the electrical supply data E);
the absorbed electrical power F);
the types of fuel used and the relative supply pressures G);
the possible minimum and maximum output data of the
burner H) (see Firing rate);
maximum absorbed power I);
burner weight L).
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
regulations of the laws in force.
DANGER
The combustion air inside the boiler must be free
from hazardous mixes (e.g.: chloride, fluoride,
halogen); if present, it is highly recommended to
carry out cleaning and maintenance more
frequently.
ATTENTION
Burner handling operations can be highly
dangerous if not carried out with the greatest
attention: distance unauthorised personnel, check
integrity and suitability of the means available.
Check also that the area in which you are working
is empty and that there is an adequate escape
area (i.e. a free, safe area to which you can
quickly move if the burner should fall).
During the handling, keep the load at not more
than 20-25cm 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
burner will be installed.
CAUTION
After removing all the packaging, check the
integrity of the contents. In the event of doubt, do
not use the burner; contact the supplier.
The packaging elements (wooden cage or
cardboard box, nails, clips, plastic bags, etc.)
must not be abandoned as they are potential
sources of danger and pollution; they should be
collected and disposed of in the appropriate
places.
ATTENTION
The burner output must be within firing rate of the
boiler.
ATTENTION
A burner label that has been tampered with,
removed or is missing, along with anything else
that prevents the definite identification of the
burner makes any installation or maintenance
work difficult
GAS
GAZ
....
R.B.L. ABC
DEF
G H
G H
IL
RIELLO S.p.A. / I-37045 Legnago(VR) cod. xxxxxxxx
S9753
Fig. 4

13 20144769
GB
Installation
5.4 Operating position
5.5 Generator plate
Pierce the closing plate of the combustion chamber, as in Fig. 6.
The position of the threaded holes may be marked using the
gasket joint supplied with the burner.
Tab. F
5.6 Securing the burner to the boiler
For the installation proceed as follows:
Fix the burner 1)(Fig. 7) to the boiler door 2) using the 4
screws and (if necessary) the 4 nuts supplied to the standard
equipment, interposing the insulating flange gasket 3).
ATTENTION
The burner is designed to work only in the
positions 1, 2, 3, 4, and 5.
Installation 1 is preferable, as it is the only one that
allows the maintenance operations as described
in this manual.
Installations 2, 3, 4, and 5, allow operation, but
make maintenance more difficult (Fig. 5).
DANGER
Any other position could compromise the correct
operation of the appliance.
All the positions require the installation of the gas
valve with coils facing upwards or horizontally.
Installation with the coils pointing downwards 6 is
absolutely forbidden.
2 3 4 51
Fig. 5
20153255
6
mm D1 W1 W2 R W6
RX 70 S/PV 145 130 150 11 45°
20152794
W1
W2
W6
D1
R
W6
Fig. 6
Provide an adequate lifting system.
1
23
D10761
Fig. 7

20144769 14
GB
Installation
5.7 Positioning probe - electrodes
Before installing the burner on the heat generator, make sure the
probe and electrode are positioned correctly as in Fig. 8
5.8 Positioning the diaphragm (LPG operation)
The burner is supplied to operate with methane gas (G20)
A diaphragm 4)(Fig. 9) (RX 70 = mm 5.7) supplied with the kit
allows burners to operate on GPL (G31) if fitted to the gas valve
1).
The diaphragm must be installed in compliance with local laws
and regulations.
To carry out the modification:
disconnect the electrical supply;
close the fuel interception tap;
disassemble the gas valve 1) from the Venturi unit 2) by
removing the screws 3);
house the diaphragm 4) supplied with the kit in the gasket
5);
reassemble the gas valve and carry out all the adjustment
operations described above.
ATTENTION
Do not turn the electrode, place it as shown in the
figure. If the electrode is near the ionisation probe
the control box amplifier may be damaged.
ATTENTION
Respect the dimensions shown in Fig. 8.
137
151
15
±1
4.5
+0.5
0
D7236
Fig. 8
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
regulations of the laws in force.
1
2
3
4
5
D8564
Fig. 9

15 20144769
GB
Installation
5.9 Fuel supply
The burners are teamed with one-piece pneumatic proportioning
gas valves, via which the amount of gas delivered, and hence the
output produced, can be modulated.
To optimise the bulk, the gas train is assembled directly on the
body of the burner.
Air/gas mixer
Gas and combustive air are mixed inside the purging circuit
(mixer), starting from the intake inlet.
Through the gas train, fuel is introduced into the intake air current
and optimal mixing commences with the aid of a mixer.
Explosion danger due to fuel leaks in the
presence of a flammable source.
Precautions: avoid knocking, attrition, sparks and
heat.
Make sure the fuel interception tap is closed
before performing any operation on the burner.
ATTENTION
The fuel supply line must be installed by qualified
personnel, in compliance with current standards
and laws.
DANGER
Disconnect the electrical power using the system
main switch.
Check that there are no gas leaks.
Pay attention when handling the train: danger of
crushing of limbs.
Make sure that the gas train is properly installed
by checking for any fuel leaks.
ATTENTION
See the accompanying instructions for the
adjustment of the gas train.
The operator must use the required equipment
during installation.

20144769 16
GB
Installation
5.9.1 Gas train assembly
This has been type-approved together with the burner, in
accordance with EN 676 standard, and is supplied with the
burner.
The connection valve-manifold allows compensating the
accidental occlusion of the suction line through the distributed
gas reduction.
5.9.2 Gas valve
Tab. G
GAS TRAIN ASSEMBLY
D7375
D7380
Air/gas mixer
in the suction line circuit
Gas supply
Gas pressure test point
upline (P1)
Gas pressure test point
downline (P2)
Flange Gas valve
Gas flow adjustment
maximum (V1)
Gas flow adjustment
minimum on the stabilizer (V2)
D7376
Gas compensation pipe
D7155
Fig. 10
Valve model Honeywell VK4125V 2003 4
Mixer model Honeywell 45.900.444-001B
Gas line connection ½" inlet
Working temperature -15°C/70°C
Max. working pressure 30 mbar
Min. working pressure 15 mbar
Max. inlet pressure 60 mbar
Valve class B + B
Electric power supply 220-240 V
Protection level IP 40 according to IEC 529

17 20144769
GB
Installation
5.10 Electrical connections
Notes on safety for the electrical wiring
Before carrying out any maintenance, cleaning or checking
operations:
If the cover is still present, remove it and proceed with the
electrical wiring according to the wiring diagrams.
Use flexible cables according to standard EN 60 335-1.
NOTE:
It is not necessary to use a shielded cable for the burner's power
supply.
5.10.1 Testing
Check that the burner is OFF by opening thermostats (TL);
check that the burner is blocked while it is working by opening
the connector (CN) in the probe red wire and located outside the
control box.
5.10.2 Ionisation current
The minimum current necessary for the control box operation is
5 µA. The burner normally supplies a higher current value, so that
no check is needed.
Anyway, if you want to measure the ionisation current, you need
to open the connector (CN1) fitted on the red wire and insert a
microammeter.
Optimum calibration values
Tab. H
DANGER
The electrical wiring must be carried out with the electrical supply disconnected.
Electrical wiring must be made in accordance with the regulations currently in force in the country of destination
and by qualified personnel. Refer to the wiring diagrams.
The manufacturer declines all responsibility for modifications or connections different from those shown in the
wiring diagrams.
Check that the electrical supply of the burner corresponds to that shown on the identification label and in this
manual.
The burner has been type-approved for intermittent use.
This means they should compulsorily be stopped at least once every 24 hours to enable the control box to
perform checks of its own start-up efficiency. Normally, burner stopping is guaranteed by the boiler's thermostat/
pressure switch.
If this is not the case, a time switch should be fitted in series to TL to stop the burner at least once every 24 hours.
Refer to the wiring diagrams.
The electrical safety of the device is obtained only when it is correctly connected to an efficient earthing system,
made according to current standards. It is necessary to check this fundamental safety requirement. In the event of
doubt, have the electrical system checked by qualified personnel. Do not use the gas tubes as an earthing system
for electrical devices.
The electrical system must be suitable for the maximum power absorption of the device, as indicated on the label
and in the manual, checking in particular that the section of the cables is suitable for that level of power
absorption.
For the main power supply of the device from the electricity mains:
- do not use adapters, multiple sockets or extensions;
- make provisions for an omnipolar switch with a gap between the contacts of at least 3 mm (over-voltage
category III), as required by current safety regulations.
Do not touch the device with wet or damp body parts and/or in bare feet.
Do not pull the electric cables.
DANGER
Disconnect the electrical supply from the burner
by means of the system main switch.
DANGER
Close the fuel shut-off valve.
DANGER
Avoid condensate, ice and water leaks from
forming.
After carrying out maintenance, cleaning or
checking operations, reassemble the cover and
all the safety and protection devices of the burner.
MIN. output MAX. output
CO2 (%) O2 (%) CO2 (%) O2 (%)
METHANE86.694.9
LPG 9.5 6.4 10 5.6
Probe
Connector
Control box
D5006 Fig. 1

20144769 18
GB
Start-up, calibration and operation of the burner
6.1 Notes on safety for the first start-up
6.2 Adjustments prior to ignition
The following adjustments must be carried out:
Open the manual valves upstream of the gas train.
Bleed the air from the gas line using the screw on the socket
START.
Check the trimmer settings on the control box (Fig. 11).
6.3 Burner start-up
Close the thermostat and switch on the burner's power.
The burner starts up under pre-purging conditions to the START
and the ignition occurs.
If the fan starts up, but no flame appears by the end of the safety
time, the control box allows the start-up programme to be
repeated up to 2 times.
If ignition does not occur upon the third attempt, the burner goes
into lockout mode. Reset and wait for a new start-up attempt.
If ignition is still not achieved, it may be that gas is not reaching
the combustion head within the safety time period of 5 seconds.
Turn the screw V1 on the gas valve mixer slightly anticlockwise.
Once ignition has taken place, proceed with burner global
calibration operations.
6.4 Fan adjustment
Modulation is based on variable-speed technology.
Combustion air delivery can be adjusted by varying the motor's
speed (rpm).
The proportioning gas train delivers the right amount of fuel,
depending on the pressure detected in the purging circuit.
Hence the output delivered is adjusted by varying the motor's
speed of rotation.
The speed of the motor can be adjusted by means of three
“Trimmers” (Fig. 11).
6 Start-up, calibration and operation of the burner
ATTENTION
The first start-up of the burner must be carried out
by qualified personnel, as indicated in this manual
and in compliance with the standards and
regulations of the laws in force.
ATTENTION
Check the correct working of the adjustment,
command and safety devices.
ATTENTION
Before starting up the burner, refer to section
“Safety test - with no gas supply” on page 24.
D10762
Fig. 11