Riello RX28 S/PV H Quick start guide

20037207 (3) - 04/2013
Installation, use and maintenance instructions
Premixed gas burner
One stage operation
CODE MODEL TYPE
20033678 RX28 S/PV H 900T5
GB

1 20037207
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Contents
1 Declaration.................................................................................................................................................................................. 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 Danger: live components ................................................................................................................................................ 4
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 Technical data ................................................................................................................................................................ 7
4.3 Destination country - Gas category ................................................................................................................................ 7
4.4 Accessories .................................................................................................................................................................... 7
4.4.1 Fan control card kit ......................................................................................................................................................... 7
4.5 Maximum dimensions ..................................................................................................................................................... 8
4.6 Description of the burner ................................................................................................................................................ 8
4.7 Burner equipment ........................................................................................................................................................... 8
5 Installation .................................................................................................................................................................................. 9
5.1 Notes on safety for the installation.................................................................................................................................. 9
5.2 Handling.......................................................................................................................................................................... 9
5.3 Preliminary checks.......................................................................................................................................................... 9
5.4 Generator plate............................................................................................................................................................. 10
5.5 Securing the burner to the boiler .................................................................................................................................. 10
5.6 Positioning the probe - electrode.................................................................................................................................. 10
5.7 Positioning the diaphragm (LPG operation).................................................................................................................. 11
5.8 Fuel supply ................................................................................................................................................................... 11
5.8.1 Gas train assembly ....................................................................................................................................................... 11
5.8.2 Air/gas mixer................................................................................................................................................................. 11
5.8.3 Testing .......................................................................................................................................................................... 12
5.8.4 Ionisation current .......................................................................................................................................................... 12
6 Operation .................................................................................................................................................................................. 13
6.1 Notes on safety for the first start-up.............................................................................................................................. 13
6.2 Adjustments prior to ignition ......................................................................................................................................... 13
6.3 Burner start-up.............................................................................................................................................................. 13
6.4 Fan adjustment ............................................................................................................................................................. 13
6.5 Gas valve adjustment ................................................................................................................................................... 14
6.6 Burner adjustment ........................................................................................................................................................ 14
6.7 Combustion head.......................................................................................................................................................... 15
6.8 Operating programme................................................................................................................................................... 16
6.8.1 Normal operation .......................................................................................................................................................... 16
6.8.2 Lockout due to ignition failure ....................................................................................................................................... 16
6.8.3 Lockout due to a flame or flame simulation detected during pre-purging ..................................................................... 16
6.9 Recycle function if flame goes out during operation ..................................................................................................... 17
6.10 Restart function following firing failure .......................................................................................................................... 17
6.11 Control of the motor rpm............................................................................................................................................... 17
6.12 Control box reset (using built-in button)........................................................................................................................ 17
7 Maintenance.............................................................................................................................................................................. 18
7.1 Notes on safety for the maintenance ............................................................................................................................ 18
7.2 Maintenance programme.............................................................................................................................................. 18

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Contents
7.2.1 Maintenance frequency .................................................................................................................................................18
7.2.2 Checking and cleaning ..................................................................................................................................................18
8 Faults / Solutions......................................................................................................................................................................19
8.1 Start-up problems..........................................................................................................................................................19
8.2 Operating faults .............................................................................................................................................................20
9 Electrical wiring ........................................................................................................................................................................21
9.1 Electrical panel layout ...................................................................................................................................................21

3 20037207
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Declaration
1Declaration
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 burner
Model: RX28 S/PV H
These products are in compliance with the following Technical Standards:
EN 12100
EN 676
and according to the European Directives:
LVD 2006/95/EC Low Voltage Directive
EMC 2004/108/EC Electromagnetic Compatibility
The quality is guaranteed by a quality and management system certified in accordance with UNI EN ISO 9001.
Legnago, 08.04.2013 Executive Director
RIELLO S.p.A. - Burner Department
Research & Development Director
RIELLO S.p.A. - Burner Department
Mr. I. Zinna Mr. R. Cattaneo

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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
Service of the area;
is designed for use by qualified personnel;
offers important indications and instructions relating to the
installation safety, start-up, use and maintenance of the
burner.
Symbols used in the manual
In some parts of the manual you will see triangular DANGER
signs. Pay great attention to these, as they indicate a situation of
potential danger.
2.1.2 General dangers
The dangers can be of 3 levels, as indicated below.
2.1.3 Danger: live components
Other symbols
Abbreviations used
Ch. Chapter
Fig. Figure
Pag. Page
Sec. Section
Tab. Table
Delivery of the system and the instruction manual
When the system is delivered, it is important that:
The instruction manual is supplied 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 Assist-
ance Centre.
The system supplier carefully informs the user about:
– the use of the system,
– any further tests that may be necessary before the system
is started up,
– maintenance and the need to have the system checked at
least once a year by the manufacturer or another special-
ised technician.
To ensure a periodic check, the manufacturer recom-
mends the drawing up of a Maintenance Contract.
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.
WARNING
This symbol indicates operations which, if not car-
ried out correctly, may cause serious injury, death
or long-term health risks.
CAUTION
This symbol indicates operations which, if not car-
ried out correctly, may cause damage to the ma-
chine and/or injury to people.
DANGER
This symbol indicates operations which, if not car-
ried out correctly, lead to electric shocks with le-
thal consequences.
ENVIRONMENTAL PROTECTION
This symbol gives indications for the use of the
machine with respect for the environment.
This symbol indicates a list.
.........................................................................................
.........................................................................................
.........................................................................................
.........................................................................................

5 20037207
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Information and general warnings
2.2 Guarantee and responsibility
The manufacturer guarantees its new products from the installa-
tion date, in accordance with the regulations in force and/or the
sales contract. At the moment of the first start-up, check that the
burner is integral and complete.
In particular, the rights to the guarantee and the responsibility will
no longer be valid, in the event of damage to things or injury to
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 non authorised modifications on the equip-
ment;
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 power supply system;
use of the burner even following an error and/or an irregular-
ity;
repairs and/or overhauls incorrectly carried out;
modification of the combustion chamber with inserts that
prevent the regular development of the flame, as structurally
established;
insufficient and inappropriate surveillance and care of those
burner components most subject to wear and tear;
use of non-original components, including spare parts, kits,
accessories and optionals;
force majeure.
The manufacturer furthermore declines any and every re-
sponsibility for the failure to observe the contents of this
manual.
WARNING
Failure to observe the information given in this
manual, operating negligence, incorrect installa-
tion and the carrying out of non authorised modifi-
cations 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 users 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 room temperature must all be within the values indi-
cated 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;
must take all the measures necessary to prevent unauthor-
ised people gaining access to the machine;
undertakes to inform his personnel in a suitable way about
the application and observance of the safety instructions.
With that aim, he undertakes to ensure that everyone knows
the use and safety instructions for his own duties;
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 equip-
ment envisaged by legislation and follow the indications
given in this manual.
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 manufacturer therefore
declines any and all responsibility for any damage that may
be caused by the use of non-original parts.
3 Safety and prevention

7 20037207
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Technical description of the burner
4.1 Models available
4.2 Technical data
4.3 Destination country - Gas category
NOTES:
The requested protection level must be reached on the
application.
Temperature and operation of the burner from 0° C to 60° C.
4.4 Accessories
4.4.1 Fan control card kit
A special kit is available for modifying the operating and ignition
output (Fig. 1).
– To modify the operating output, adjust the MAX trimmer.
– To modify the ignition output, adjust the START trimmer.
4 Technical description of the burner
Designation Voltage Code
RX28 S/PV H 230V/50-60Hz 20033678
Model RX28 S/PV H
Thermal power 28 kW
24,080 Kcal/h
Natural gas - (Family 2) G20 Ncv: 9.45 kWh/Sm3 = 8,100 kcal/Sm3- Pressure 10 - 30 mbar
G25 Ncv: 8.125 kWh/Sm3 = 7,000 kcal/Sm3- Pressure 10 - 30 mbar
LPG - (Family 3) G31 Ncv: 24.44 kWh/Sm3 = 21,000 kcal/Sm3- Pressure 10 - 30 mbar
Electrical supply Single-phase, 230V ~±10% , 50 Hz
Motor Max 6,840 rpm - 50/60 Hz
Ignition transformer Primary 220V/240 - 50/60Hz– Secondary 15 kV - 25 mA
Reference conditions: Air temperature 20°C - Gas temperature 15°C - Barometric pressure 1013 mbar - Altitude 0 m a.s.l.
Country
AT - CH - CZ - DK - EE - ES
FI - GB - GR - IE - IT - LT - LV
NO - PT - SE
BE - DE - DK - ES - FI - FR
GB - GR - IE - IT - LU - NO
PT - SE
AT - BE - CH - CZ - DE - ES
FR - GB - GR - IE - IT - PT
Gas category I2H I2R I3P
Gas pressure 20mbar 20/25mbar 29mbar
Country DE BE LU - PL FR
Gas category I2ELL I2E(R)B I2E I2Er
Gas pressure 20mbar 20/25mbar 20mbar 20/25mbar
Model Code
RX28 S/PV H 20035266
Fig. 1
D11289

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Technical description of the burner
4.5 Maximum dimensions
The maximum dimensions of the burner and flange are shown in
Fig. 2.
4.6 Description of the burner
1 Reset button with lockout signal
2 Control box
3 Gas valve
4 Air/gas mixer in intake circuit
5 Flange
6Fanmotor
7 Combustion head with metal mesh
8 Ignition electrode
9 Flame detection probe
10 Ignition transformer
11 7 pole socket
4.7 Burner equipment
Gas valve fitting + screws . . . . . . . . . . . . . . . . . . . . . . . . . No. 1
Insulating 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
54
175
294
525
230
203
D11184 Fig. 2
Fig. 3
6
432
10
7
59
8
ALARM
RESET
1
11
D11185

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Installation
5.1 Notes on safety for the installation
After carefully cleaning all around the area where the burner will
be installed, and arranging the correct lighting of the environ-
ment, proceed with the installation operations.
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, showing:
the model A)(Fig. 4) and type of burner B);
the year of manufacture, in cryptographic form C);
the serial number D);
the electrical supply data E);
the electrical power consumption F);
the types of fuel used and the relative supply pressures G);
the data of the burner's minimum and maximum output pos-
sibilities H).
5 Installation
DANGER
All the installation, maintenance and disassembly
operations must be carried out with the electricity
supply disconnected.
WARNING
The installation of the burner must be carried out
by qualified personnel, as indicated in this manual
and in compliance with the standards and regula-
tions of the laws in force.
WARNING
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.
CAUTION
After positioning the burner near the installation
point, correctly dispose of all residual packaging,
separating the various types of material.
Before proceeding with the installation operations,
carefully clean all around the area where the 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; they should be collected
and disposed of in the appropriate places.
WARNING
The burner output must be within the boiler's firing
rate;
WARNING
A burner label that has been tampered with, re-
moved or is missing, along with anything else that
prevents the definite identification of the burner
and makes any installation or maintenance work
difficult.
Fig. 4
GAS
GAZ
....
II2R3R
D10747
ABC
DE
G
GHF H

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Installation
5.4 Generator plate
Pierce the closing plate of the combustion chamber, as in Fig. 5.
The position of the threaded holes may be marked using the gas-
ket joint supplied with the burner.
5.5 Securing the burner to the boiler
For the installation proceed as follows:
fix the burner 1)(Fig. 6) to the boiler door 2) using the 4
screws and (if necessary) the 4 nuts supplied to the stand-
ard equipment, interposing the insulating gasket 3).
5.6 Positioning the probe - electrode
Before installing the burner on the generator, make sure the
probe and electrode are placed correctly as in Fig. 7.
Fig. 5
140 160
11
45
120
D8914
2
1
3
D8784
Fig. 6
WARNING
Do not turn the electrode: position it as illustrated.
Placing the electrode near the ionisation probe
may result in the control box amplifier being dam-
aged.
168
5÷5.5
18
Fig. 7
D8643

11 20037207
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Installation
5.7 Positioning the diaphragm (LPG operation)
The burner is supplied to operate with methane gas (G20)
A diaphragm 4)(Fig. 8) supplied with the kit, allows burners to
operate on LPG (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:
cut off 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.
5.8 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.
A signal reporting pressure detected in the air circuit is carried to
the pneumatic gas valve, which delivers an amount of gas in pro-
portion to the airflow produced by the fan.
To optimise the bulk, the gas train is assembled directly on the
body of the burner.
5.8.1 Gas train assembly
The connection valve-manifold allows compensating the acci-
dental occlusion of the suction line through the distributed gas re-
duction.
Technical data
Tab. A
5.8.2 Air/gas mixer
Gas and combustive air are mixed inside the purging circuit (mix-
er), 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.
Key (Fig. 9)
1 Gas pressure downline test point (P2)
2 Gas pressure downline test point (P1)
3 Gas supply
4Flange
5 Gas valve
6 Minimum gas flow adjustment on the stabiliser (V2)
7 Minimum gas flow adjustment (V1)
8 Air/gas mixer in the suction line circuit
1
2
3
4
5
D8564
Fig. 8
Valve model Honeywell VK4125V 2003 4
Mixer model Honeywell 45.900.444-003B
Gas line connection DN 15 - inlet 1/2”
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
Electrical supply 220-240 V
Protection level IP 40 according to IEC 529
1
2
4
5
6
7
8
3
D11282
D7155 D7376
Fig. 9

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Installation
5.8.3 Testing
Check the standby of the burner by opening the thermostats (TL);
check that the burner is blocked while is working by opening the
connector (CN) inserted in the probe red wire and located outside
the control box.
5.8.4 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. B
MIN. output MAX. output
CO2(%) O2(%) CO2(%) O2(%)
Methane 8 6.6 9 4.9
LPG 9.5 6.4 10 5.6
Fig. 10
+
Probe
Connector
Control box
D8926

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Operation
6.1 Notes on safety for the first start-up
6.2 Adjustments prior to ignition
The following adjustments must be carried out:
open manual valves upline from the gas train.
Bleed the air from the gas line using the screw on the socket
“P1”.
Installare un manometro sulla presa di pressione “P2” posta
sulla valvola gas.
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 3 times.
– If ignition does not occur upon the third attempt, the burner
goes into lockout mode. Reset and wait for a new start-up at-
tempt.
– If ignition is still not achieved, it may be that gas is not reach-
ing the combustion head within the safety time period of 5
seconds.
– Turn the screw “V1” on the gas valve mixer slightly anticlock-
wise.
– Check the pressure shown on the pressure gauge connected
to the socket “P2” of the valve, and compare it with that indi-
cated on the table below.
– Once the burner has ignited, proceed with the global adjust-
ment of the burner.
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, de-
pending on the pressure detected in the purging circuit. Hence
the output delivered is adjusted by varying the motor's speed of
rotation.
The motor speed can be adjusted via the Trimmers on the fan
control card kit (supplied separately). When using the kit to make
the adjustments, intervene on the “START” and “MAX” trimmers
only (Fig. 11).
6 Operation
WARNING
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 regula-
tions of the laws in force.
WARNING
Check the correct working of the adjustment, com-
mand and safety devices.
Fig. 11
D11289

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Operation
6.5 Gas valve adjustment
The adjustment of the output of gas is achieved by using the
screw “V1”(Fig. 9).
– To increase the output: turn the screw anticlockwise (un-
screw).
– To reduce the output: turn the screw clockwise (tighten).
6.6 Burner adjustment
Check the output supplied, which must correspond with that re-
quested by the oven used.
To increase or reduce its value, intervene directly on the trimmer
on the fan control card kit supplied separately (Fig. 11).
Measure the gas delivery on the counter to precisely establish the
burnt output. Using a smoke analyser, measure the value of the
CO2or the O2in order to optimise the burner calibration.
The correct values for the gas G20 (natural gas) are:
CO28.5 - 9% or O25 - 5.5%.
To correct these values act on the gas valve in the following way:
to increase the gas delivery and the CO2:
turn the screw V1 anticlockwise (unscrew)
to reduce the gas delivery and the CO2:
turn the screw V1 clockwise (tighten).
The burner is supplied for operation with G20 (natural gas). For
conversion to G31 (LPG), use the special kit supplied.
Before carrying out the conversion:
– Close the fuel interception tap.
– Disassemble the gas valve 1)(Fig. 12) from the venturi unit
2), removing the screws 3).
– Substitute the diaphragm 4) on the gas valve 1) with the one
supplied.
– House the diaphragm 4) in the gasket 5).
The Tab. C shows the various diameters of the diaphragms
calibrated on the basis of the type of gas used.
Tab. C
– Reassemble the gas valve and carry out all the adjustment
operations described above.
The correct values for the gas G31 (LPG) are:
CO210 - 10.7% or O25.7 - 6.2%.
To correct these values act on the gas valve in the following way:
to increase the gas delivery and the CO2: turn the screw V1
anticlockwise (unscrew)
to reduce the gas delivery and the CO2: turn the screw V1
clockwise (tighten).
The necessary values of the pressure on the gas mains are:
– for G20 = 20 mbar
– for G31 = 37 mbar
The Tab. D below gives the possible settings for a generator.
Tab. D
WARNING
Remove the electricity supply.
DIAMETER DIAPHRAGM
Gas type Diameter (mm)
G20 6
G31 3,5
D7627
1
2
3
5
4
Fig. 12
Output
(kW) Gas type Pressure P2 (mbar)
No. of turns per min.
(rpm) CO2(%) Trimmer position
28 G20 -0,1 5500 8 - 9% 10

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Operation
6.7 Combustion head
The combustion head comprises a highly thermal resistant cylin-
der whose surface features numerous holes, encased in a metal
"mesh" (Fig. 13).
The air-gas mixture is pushed inside the cylinder and out of the
head through the holes in the perimeter.
Combustion starts when the air-gas mixture is ignited by a spark
generated by the electrode.
The metal "mesh" is the combustion head's most essential ele-
ment since it improves burner performance considerably.
The flame developed on the surface of the head is perfectly re-
tained and adheres to the mesh when operating at the maximum
setting.
This allows modulating ratios as high as 6:1, avoiding the danger
of flashback when modulating is at its minimum.
The flame features an extremely compact geometry, meaning
that there is no risk of contact between the flame and parts of the
generator, consequently eliminating the possible problem of poor
combustion.
The flame's structure means that smaller combustion chambers
can be developed, designed to exploit this particular feature.
Fig. 13
D9714

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Operation
6.8 Operating programme
6.8.1 Normal operation
6.8.2 Lockout due to ignition failure
6.8.3 Lockout due to a flame or flame simulation detected during pre-purging
ts
t3t2
tw t1 tm
TL
M
I
V
SO
LED
P
M
SO
.
tf
D10632
Red (LED signalling)
No signal needs to be received
Fig. 14
Key
I– Ignition transformer
LED – Reset button LED indicating operating status
M–Fanmotor
SO – Ionisation probe
TL – Limit thermostat
V– Gas valve
Lockout
Flame loss during the operation
and lockout due to ignition failure
D7253
ts
t3
t1
t2
tw
TL
M
I
V
SO
LED
P
M
.
D10631
Lockout at 3th
re-ignition
Red (LED signalling)
Fig. 15
ts
t1tw
TL
M
I
V
SO
LED
P
M
.
Key
I– Ignition transformer
LED – Reset button LED indicating operating
status
M–Fanmotor
SO – Ionisation probe
TL – Limit thermostat
V– Gas valve
Red (LED signalling)
D10633
Lockout
Fig. 16

17 20037207
GB
Operation
Operating times
Time expressed in seconds
Tab. E
Lockout types and triggering times in case of burner mal-
function
Tab. F
6.9 Recycle function if flame goes out during operation
The control box allows recycling, i.e. the complete repetition of
the start/up program.
If after the safety time since the last recycle the flame does not
appear, the burner carries out a lockout.
6.10 Restart function following firing failure
The control box allows the start-up programme to be repeated,
making up to 3 attempts, if no flame is formed by the end of the
safety time.
If the flame still fails to appear after the fourth ignition attempt, the
burner locks out at the end of the safety time.
6.11 Control of the motor rpm
Check of the motor operation if the rotation number per minimum
minute exceeds (900 rpm).
If the motor does not exceed the number of minimum turns, it
stops after 20 seconds.
6.12 Control box reset (using built-in button)
To carry out the control box reset, proceed as follows:
Press and hold the reset button for 1-2 seconds.
In case the burner does not restart it is necessary to check if
the limit thermostat (TL) is closed.
ta tf tl tm ts tw t1 t2 t3 t8
20140105 - 253 510
ta Time for checking motor turns:
if the number of turns is lower than 900 rpm, after ta will
be carried out a lockout.
tw Stabilisation time motor turns.
tf Response time after the flame disappearance. t1 Pre-purging time:
by the signal of heat request to the end of the ignition.
tl Flame or flame simulation detected during pre-purging:
immediate lockout. t2 Transformer pre-ignition time: ignition before the valve closing.
tm Stabilisation time:
the modulation occurs after this time. t3 Transformer ignition time: the transformer remains on during the safety time.
ts Safety time:
if at the end of the time ts a flame is not present, tpp is
carried out. After 3 times follows a lockout.
t8
Post-purging time:
Additional purging when the heat request is completed,
or in case of flame failure during the operation or in
case of ignition failure.
Description of types of faults Lockout
Presence of flame in pre-purging “t1” At the end of the time of “t1”
No ignition at end of safety time “ts” After max. 3 repeats, within 1 second
Flame goes out during operation After max. 1 repetition, if there is no flame at the end of ts
Not correct No. of turns of the fan motor (< 900 rpm) After max. 20 seconds
Fault at the valve circuit At the end of the time of “t1”

20037207 18
GB
Maintenance
7.1 Notes on safety for the maintenance
The periodic maintenance is essential for the good operation,
safety, yield and duration of the burner.
It allows you to reduce consumption and polluting emissions and
to keep the product in a reliable state over time.
Before carrying out any maintenance, cleaning or checking oper-
ations:
7.2 Maintenance programme
7.2.1 Maintenance frequency
The combustion system should be checked at least once a year
by a representative of the manufacturer or another specialised
technician.
7.2.2 Checking and cleaning
Flexible hoses
Check there are no occlusions or obstructions in the fuel supply
pipes, in the air suction areas and in the combustion product
waste pipe.
Electrical wiring
Check that the burner and gas train electrical connections are
correct.
Gas leaks
Make sure there are no gas leaks in the following areas:
– on the meter-burner pipework
– on the mixer/valve connection
– on the burner fastening flange where gaskets are fitted.
Combustion head
Inspect the combustion head and make sure the fabric is undam-
aged and does not feature large or deep holes or corroded areas.
Also make sure that no parts have warped as a result of the high
temperature.
Electrodes assembly
Make sure neither the electrodes nor probe show marked warp-
ing or oxidation on surfaces.
Make sure distances are still in line with those indicated in Fig. 7,
readjusting to the right values where necessary. Where neces-
sary, remove oxide from the surface of the probe with abrasive
paper.
Gas train
Check valve setting and proportionality of operation by analysing
flue gases.
Check the valve/manifold compensation pipe.
Combustion
Let the burner run at full capacity for about ten minutes, setting all
the elements correctly as explained in this manual.
Then carry out the analysis of the combustion by checking:
•CO
2percentage (%);
• CO content (ppm);
• NOx content (ppm);
• Ionisation current (µA);
• Flue gas temperature at the flue.
Adjust the burner if the combustion values found at the beginning
of the operation do not comply with the regulations in force or, at
any rate, do not produce good combustion.
Use the appropriate card to record the new combustion values;
they will be useful for subsequent controls.
7 Maintenance
DANGER
The maintenance interventions and the calibration
of the burner must only be carried out by qualified,
authorised personnel, in accordance with the con-
tents of this manual and in compliance with the
standards and regulations of current laws.
DANGER
disconnect the electricity supply from the burner
by means of the main switch of the system;
DANGER
Close the fuel interception tap.