Baxi Eco Compact User manual

it CALDAIA MURALE A GAS AD ALTO RENDIMENTO
Manuale per l’uso destinato all’utente ed all’installatore
en HIGH PERFORMANCE GAS-FIRED WALL-MOUNTED BOILER
Operating and installation instructions
ru ВЫСОКОПРОИЗВОДИТЕЛЬНЫЙ НАСТЕННЫЙ ГАЗОВЫЙ КОТЕЛ
Руководство по установке и эксплуатации
es CALDERA MURAL DE GAS DE ALTO RENDIMIENTO
Manual para el usuario y el instalador
hu MAGAS HOZAMÚ FALI GÁZKAZÁN
Felhasználói és szerelői kézikönyv
cs PLYNOVÝ ZÁVĚSNÝ KOTEL S VYSOKOU ÚČINNOSTÍ
Návod na použití určený pro uživatele a instalatéra
sk PLYNOVÝ ZÁVESNÝ KOTOL S VYSOKOU ÚČINNOSŤOU
Návod na použitie určený pre používateľa a inštalatéra
fr CHAUDIERE MURALE A GAZ A HAUT RENDEMENT
Notice d’emploi et d’installation destinée à l’utilisateur et à l’installateur
ro CENTRALĂ TERMICĂ MURALĂ PE GAZ CU RANDAMENT RIDICAT
Manual de instrucţiuni pentru utilizator şi instalator

7110102.03 (1-06/13) 24
User & Installer (en)
Dear Customer,
Our company is condent our new product will meet all your requirements. Buying one of our products guarantees all your
expectations: good performance combined with simple and rational use.
Please do not put this booklet away without reading it rst: it contains useful information for the correct and efcient use of your
product.
Our company declares that these products are marked in compliance with the essential requirements of the
following Directives:
- Gas Directive 2009/142/EC
- Efciency Directive 92/42/EEC
- Electromagnetic Compatibility Directive 2004/108/EC
- Low Voltage Directive 2006/95/EC
Our company, constantly striving to improve the products, reserves the right to modify the details given in this documentation
at any time and without notice. These Instructions are only meant to provide consumers with use information and under no
circumstance should they be construed as a contract with a third party.
CONTENT
DESCRIPTION OF SYMBOLS.....................................................................................................................................................................25
SAFETY WARNINGS....................................................................................................................................................................................25
GENERAL PRECAUTIONS .........................................................................................................................................................................26
ENERGY-SAVING TIPS................................................................................................................................................................................26
1. COMMISSIONING THE BOILER..................................................................................................................................................................27
1.1 ADJUSTING THE CHAND DHW FLOW TEMPERATURE ..........................................................................................................................27
2. OPERATING MODES...................................................................................................................................................................................28
3. FILLING THE SYSTEM.................................................................................................................................................................................28
4. SWITCHING OFF THE BOILER...................................................................................................................................................................28
5. GAS CONVERSION .....................................................................................................................................................................................28
6. PROLONGED SHUTDOWN. ANTI-FREEZE PROTECTION.......................................................................................................................28
7. FAULTS.........................................................................................................................................................................................................29
8. ROUTINE MAINTENANCE INSTRUCTIONS...............................................................................................................................................29
INSTRUCTIONS PRIOR TO INSTALLATION...............................................................................................................................................30
9. INSTALLING THE BOILER...........................................................................................................................................................................30
10. INSTALLING THE DUCTS............................................................................................................................................................................30
10.1 CONCENTRIC DUCTS.................................................................................................................................................................................31
10.2 SEPARATE DUCTS......................................................................................................................................................................................31
11. ELECTRICAL CONNECTIONS.....................................................................................................................................................................32
11.1 CONNECTING THE ROOM THERMOSTAT.................................................................................................................................................33
11.2 ACCESSORIES NOT INCLUDED IN THE SUPPLY.....................................................................................................................................33
12. GAS VALVE...................................................................................................................................................................................................34
12.1 GASCONVERSION ......................................................................................................................................................................................34
12.2 REPLACING THE GAS VALVE.....................................................................................................................................................................35
12.3 GAS VALVE CALIBRATION..........................................................................................................................................................................35
12.4 REPLACING THE ELECTRONIC BOARD...................................................................................................................................................36
13. VISUALISATION OF PARAMETERS ON THE DISPLAY (“INFO” FUNCTION) ...........................................................................................36
14. PARAMETER SETTINGS.............................................................................................................................................................................37
15. TROUBLESHOOTING SERVICE FAULTS...................................................................................................................................................38
16. ADJUSTMENTAND SAFETY DEVICES......................................................................................................................................................41
17. PUMP CAPACITY/ HEAD.............................................................................................................................................................................41
18. ANNUAL SERVICING...................................................................................................................................................................................42
18.1 HYDRAULIC UNIT........................................................................................................................................................................................42
18.2 POSITIONING THE ELECTRODE................................................................................................................................................................42
18.3 CLEANING THE FILTERS............................................................................................................................................................................42
18.4 REMOVING SCALE FROM THE D.H.W. CIRCUIT......................................................................................................................................43
18.5 DISMOUNTING THE WATER-WATER HEAT EXCHANGER.......................................................................................................................43
19. COMBUSTION PARAMETERS ....................................................................................................................................................................43
20. TECHNICAL SPECIFICATIONS...................................................................................................................................................................44

25
User & Installer (en)
7110102.03 (1-06/13)
DESCRIPTION OF SYMBOLS
WARNING
Risk of damage to or malfunction of the appliance. Pay special attention to the warnings concerning
danger to people.
DANGER OF BURNS
Wait for the appliance to cool down before working on the parts exposed to heat.
DANGER - HIGH VOLTAGE
Live components - electrocution hazard.
DANGER OF FREEZING
Possible formation of ice due to low temperatures.
FIRE HAZARD
Potentially ammable material or gas.
IMPORTANT INFORMATION
Information to read with particular care as it is useful for the correct operation of the boiler.
GENERIC PROHIBITION
It is forbidden to do/use the things indicated alongside the symbol.
SAFETY WARNINGS
SMELL OF GAS
• Switch off the boiler.
• Do not activate any electrical device (such as switching on the light).
• Put out any naked ames and open the windows.
• Call an Authorised Service Centre.
SMELL OF COMBUSTION FUMES
• Switch off the boiler.
• Open all the doors and windows to ventilate the room.
• Call an Authorised Service Centre.
FLAMMABLE MATERIAL
Do not use and/or store highly ammable material (thinners, paper, etc.) near the boiler.
SERVICING AND CLEANING THE BOILER
Switch off the boiler before working on it.
Do not leave any packaging (plastic bags, polystyrene, etc.) within the reach of children as they are a potential source of danger.
The appliance is not intended to be used by persons with reduced physical, sensory or mental capacities, or who lack
experience or knowledge, unless, through the mediation of a person responsible for their safety, they have had the benet
of supervision or of instructions on the use of the appliance.
BAXI a leading European manufacturer of hi-tech boilers and heating systems, has developed
CSQ-certied quality management (ISO 9001), environmental (ISO 14001) and health and
safety (OHSAS 18001) systems. This means that BAXI S.p.A. includes among its objectives the
safeguarding of the environment, the reliability and quality of its products, and the health and
safety of its employees.
Through its organisation, the company is constantly committed to implementing and improving
these aspects in favour of customer satisfaction.

7110102.03 (1-06/13) 26
User & Installer (en)
GENERAL PRECAUTIONS
This boiler has been designed to heat water to a temperature lower than boiling point at atmospheric pressure. It must be
connected to a central heating system and to a domestic hot water supply system according to its performance and power output.
Before having the boiler installed by a qualied service engineer, make sure the following operations are performed:
• Make sure that the boiler is adjusted to use the type of gas delivered by the gas supply. To do this, check the markings on the
packaging and the rating plate on the appliance.
• Make sure that the ue terminal draft is appropriate, that the terminal is not obstructed and that no exhaust gases from other
appliances are expelled through the same ue duct, unless the latter has been specially designed to collect exhaust gas from
more than one appliance, in compliance with current laws and regulations.
• Make sure that, if the boiler is connected to existing ue ducts, these have been thoroughly cleaned as residual products of
combustion may detach from the walls during operation and obstruct the ow of fumes.
• To ensure correct operation and maintain the warranty, observe the following precautions:
1. DHW circuit
1.1 If the water is harder than 20 °F (1 °F = 10 mg calcium carbonate per litre of water), install a polyphosphate dispenser or an
equivalent treatment system, compliant with current regulations.
1.2 Thoroughly ush the system after installation of the appliance and before use.
1.3 The materials used for the DHW circuit comply with Directive 98/83/EC.
2. Heating circuit
2.1 New system: Before installing the boiler, the system must be cleaned and ushed to eliminate residual thread-cutting swarf,
solder and any solvents, using suitable off-the-shelf non-acid and non-alkaline products that do not damage metal, plastic and
rubber parts. To protect the system from scale, use inhibitors such as SENTINELX100 and FERNOX protector for heating circuits.
Use these products in strict compliance with the manufacturers' instructions.
2.2 Existing system: Before installing the boiler, drain the system and clean it to remove sludge and contaminants, using suitable
proprietary products. Recommended cleaning products are: SENTINEL X300 or X400 and FERNOX regenerator for heating
circuits. Use these products in strict compliance with the manufacturers' instructions. Remember that the presence of foreign
bodies in the heating system can adversely affect boiler operation (e.g. overheating and excessive noise of the heat exchanger).
Initial lighting of the boiler must be carried out by an authorised Service Engineer who must rst ensure that:
• The rated data correspond to the supply (electricity, water and gas) data.
• That the installation complies with current regulations.
• The appliance is correctly connected to the power supply and earthed.
Failure to observe the above will render the warranty null and void. The names of the authorised Service Centres are indicated
in the attached sheet. Prior to commissioning, remove the protective plastic coating from the boiler. Do not use any tools or
abrasive detergents to do this as you may damage the painted surfaces.
ENERGY-SAVING TIPS
Adjustment in the heating mode
Adjust the boiler ow temperature depending on the kind of system. For systems with radiators, set a maximum heating water ow
temperature of approximately 60°C, and increase this value if the required room temperature is not reached. For systems with
radiant oor panels, do not exceed the temperature indicated by the system designer. Use the External Sensor and/or Control
Panel to automatically adjust the ow temperature to atmospheric conditions or the indoor temperature. This ensures that no more
heat than that effectively necessary is produced. Adjust the room temperature without overheating the rooms. Every extra degree
centigrade means consuming approximately 6% more. Also room ambient temperature depending on how the rooms are used.
For example, the bedroom or the least used rooms can be heated to a lower temperature. Use the programmable timer and set the
night-time room temperature at approximately 5°C lower than that during the day. There is no appreciable saving to be achieved
by setting it any lower. Only in case of a prolonged absence, such as a holiday, should the temperature setpoint be lowered. Do
not cover radiators as this prevents the air from circulating correctly. Do not leave the windows partially open to ventilate the rooms
but open them completely for a short period.
Domestic hot water
Setting the domestic hot water at the required temperature without mixing it with cold water saves a lot of money. Additional
heating wastes energy and creates additional scale.

27
USER Section (en)
7110102.03 (1-06/13)
1. COMMISSIONING THE BOILER
To light the boiler correctly, proceed as follows:
• Open the gas tap (normally positioned under the boiler);
• Check that the hydraulic pressure in the system is correct ("FILLING THE SYSTEM" section);
• power the boiler;
• press button and switch the boiler to Summer or Winter ;
• press buttons and to adjust the temperature of the heating circuit and domestic hot water circuit in order
to ignite the main burner.
When the boiler is lit, the symbol will appear on the display.
In the Summer position the main burner will only ignite if a DHW tap is opened.
During initial ignition, the burner may not ignite (causing the boiler to shut down) until any air in the gas pipes is vented. In
this case, repeat the ignition procedure until gas reaches the burner. Press button for at least 2 seconds.
Key to SYMBOLS
Operation in the heating mode
Flame present (burner on)
No ame (ignition failure)
Operation in the DHW mode
Generic fault
Resettable fault
No water (low system pressure)
Numerical signal (temperature, code, fault, etc.)
Key to BUTTONS
On / Off / Summer / Winter Reset
CH temperature adjustment Information
DHW temperature adjustment
1.1 ADJUSTING THE CH AND DHW FLOW TEMPERATURE
The system must be tted with an ambient thermostat for controlling indoor temperature.
Adjust the CH and DHW delivery temperature by pressing buttons and respectively. When the burner is
lit, the display shows the symbol .
HEATING: while the boiler is operating in the heating mode, the display shows the ashing symbol and the heating delivery
temperature (°C).
DHW: while the boiler is operating in the DHW mode, the display shows the ashing symbol and the DHW outlet temperature
(°C).

7110102.03 (1-06/13) 28
USER Section (en)
2. OPERATING MODES
Press this button to set the following operating modes:
• SUMMER
• WINTER
• OFF
In the SUMMER mode, the display shows . The boiler satises requests for DHW only while central heating is not enabled
(ambient frost protection function active).
In the WINTER mode, the display shows . The boiler satises requests for both DHW and central heating (ambient frost
protection function active).
In the OFF mode, the display shows neither of the above two symbols . In this mode, only the ambient frost protection
function is active while requests for DHW and central heating are not satised.
3. FILLING THE SYSTEM
Disconnect the boiler from the mains power supply using the two-pole switch.
Regularly check that the pressure displayed on the pressure gauge Bis 1 - 1.5 bar,
with the boiler cold. If the pressure is too low, turn tap C to ll the boiler.
In case of overpressure, open the boiler drain valve A.
ASystem drain tap
BPressure gauge
CSystem lling tap
Take special care when lling the heating system. In particular, open any
thermostat valves in the system, ensure the water enters slowly in order to
prevent the formation of air inside the primary circuit until operating pressure
is reached. Lastly, vent any radiators in the system. Our company declines all
liability for damage deriving from the presence of air bubbles in the primary exchanger due to the incorrect or imprecise observance
of the above.
The boiler is tted with a hydraulic pressure gauge which prevents the boiler from working if there is no water.
If pressure drops occur frequently, have the boiler checked by the AUTHORISED TECHNICAL SERVICE CENTRE.
4. SWITCHING OFF THE BOILER
To turn off the boiler, disconnect the electric power supply. In the "OFF" mode the boiler remains off (the display indicates OFF)
though the electrical circuits remain live and the frost protection device is enabled.
5. GAS CONVERSION
The boilers can operate both on natural gas (G20) and LPG (G31). All gas conversions must be made by the AUTHORISED
TECHNICAL SERVICE CENTRE.
6. PROLONGED SHUTDOWN. ANTI-FREEZE PROTECTION
Do not drain the whole system as lling up with water again could cause unnecessary and harmful scale to build up inside the
boiler and the heating elements. If the boiler is not used during winter and is therefore exposed to the danger of frost, add some
specic anti-freeze to the water in the system (e.g.: propylene glycol coupled with corrosion and scale inhibitors). The electronic
boiler management system includes a “frost protection” function for the heating system which, when delivery temperature falls
below 5°C, lights the burner until a delivery temperature of 30°C is reached.
The function is operative if: the boiler is electrically powered, there is gas, system pressure is normal and the boiler is not
blocked.
C
a

29
USER Section (en)
7110102.03 (1-06/13)
7. FAULTS
The faults shown on the display are identied with the symbol "E" and a number (fault code). For a
complete list of faults, see the following table.
If "R" appears on the display the fault must be RESET by the user.
To reset, press and hold down for at least 2 seconds. If this fault persists, call theAuthorised Service
Centre.
FAULTS TABLE
CODE DISPLAYED FAULT ACTION
E01 Failed ignition shutdown. Press and hold down for at least 2 seconds.
E02 Shut down by safety thermostat. Press and hold down for at least 2 seconds.
E03 Board conguration error Call the Authorised Service Centre.
E04 Safety error due to ignition failure/frequent ame
loss. Press and hold down for at least 2 seconds.
E05 Flow sensor failure. Call the Authorised Service Centre.
E06 DHW sensor fault. Call the Authorised Service Centre.
E07 Fumes NTC probe fault. Press and hold down for at least 2 seconds.
E08 Error in the ame amplication circuit. Call the Authorised Service Centre.
E09 Error in the gas valve safety circuit. Call the Authorised Service Centre.
E10 No hydraulic pressure switch enable. Check that the pressure in the system is correct; See the FILLING
THE SYSTEM section.
E22 Switching off due to power supply reductions. Automatic reset at voltages in excess of 170V. If this fault
persists, call the Authorised Service Centre.
E25 No water safety trip (pump probably blocked). Press and hold down for at least 2 seconds.
E26 Heating circuit overheated/ no water safety trip
(pump probably blocked). If this fault persists, call the Authorised Service Centre.
E35 Parasite ame (ame error). If this fault persists, call the Authorised Service Centre.
E36 Fumes NTC probe fault. Call the Authorised Service Centre.
E40 - E41 Shutdown due to probable obstruction of air/ue
duct or insufcient gas inlet pressure. Press and hold down for at least 2 seconds.
E42 Flame loss (air/ue duct may be totally obstructed or
fan may be faulty). Press and hold down for at least 2 seconds.
E43 Shutdown due to probable obstruction of air/ue
duct or insufcient gas inlet pressure.
Temporary fault. Automatic reset at voltages in excess of 185V or
press for at least 2 seconds.
E50 Shutdown due to fumes NTC probe tripping for
overheating. Press and hold down for at least 2 seconds.
E55 Gas valve not electronically calibrated. Call the Authorised Service Centre.
E62 Safety shutdown if the ame signal or fumes
temperature fail to stabilise Press and hold down for at least 2 seconds.
E65 Safety shutdown if the air/ue duct obstruction test
fails frequently. Press and hold down for at least 2 seconds.
E98 Electronic board parameters incorrectly congured. Call the Authorised Service Centre.
Flashing lights
Boiler operating at reduced power. Air/ue duct may
be obstructed or gas inlet pressure may be too low. Temporarily eliminate the current heat request to reset the fault. If this fault persists, call the Authorised Service Centre.
In case of a fault, the display backlighting ashes together with the error code.
If a fault code is displayed that is not included in the list or if a certain fault occurs frequently, contact the AUTHORISED
TECHNICAL SERVICE CENTRE.
8. ROUTINE MAINTENANCE INSTRUCTIONS
To keep the boiler efcient and safe, have it checked by the Authorised Service Centre at the end of every operating period.
Careful servicing ensures economical operation of the system.

7110102.03 (1-06/13) 30
INSTALLER Section (en)
INSTRUCTIONS PRIOR TO INSTALLATION
The following notes and technical instructions are addressed to installers to allow them to carry out trouble-free installation.
Instructions for igniting and using the boiler are contained in the ‘Instructions for Users’ section. The installation must satisfy the
requirements of local by-laws and technical regulations.
Moreover, the installation technician must be qualied to install heating appliances. Additionally, bear in mind the following:
• This boiler can be connected to any type of double- or single-pipe convector plate, radiator or fancoil unit. Design the system
sections as usual, though, bearing in mind the available capacity-head at the plate (see "SECTION" E at the end of this manual).
• Initial ignition of the boiler must be carried out by the Authorised Service Centre, as indicated on the attached sheet.
ADDITIONAL PUMP WARNING: If an additional pump is used on the heating system, a suitably sized hydraulic separator must
be installed downline from the boiler. This will allow the water pressure switch on the boiler to operate correctly.
SOLAR CIRCUIT WARNING: if the instantaneous (mixed) boiler is connected to a system with solar panels, the maximum
temperature of the domestic hot water entering the boiler must not exceed 60°C.
TEMPERATURE ADJUSTMENT ON LOW TEMPERATURE HEATING SYSTEM: for a low temperature system (such as
underoor heating), reduce the maximum CH temperature setpoint on the boiler to 45°C) by modifying parameter F06=001 as
described in the SETTING PARAMETERS section.
Failure to observe the above will render the warranty null and void.
Do not leave any packaging (plastic bags, polystyrene, etc.) within the reach of children as they are a potential source of danger.
9. INSTALLING THE BOILER
The template outline is shown in "SECTION C" at the end of this manual.
After deciding the exact location of the boiler, x the template to the wall. Connect the system to the gas and water inlets present
on the lower bar of the template. Fit two G3/4 taps (ow and return) on the central heating circuit; these taps make it possible to
carry out important operations on the system without draining it completely. If you are either installing the boiler on an existing
system or replacing one, as well as the above, t a settling tank under the boiler on the system return line in order to collect any
deposits and scale circulating in the system after ushing. After xing the boiler to the template, connect the ue and air ducts,
supplied as accessories, as described in the following sections.
Tighten the boiler water connections with care (maximum tightening torque 30 Nm).
10.INSTALLING THE DUCTS
The boiler is easy and exible to install thanks to the extensive range of available
accessories, as described below. The boiler has been designed for connection to a vertical
or horizontal coaxial ue-air duct. The boiler can also be used with separate ducts using
the accessory splitting kit.
For optimal installation, the accessories supplied by the manufacturer should be
used.
To optimise operating safety, make sure the ue ducts are rmly xed to the wall with
suitable brackets. The brackets must be positioned over the joints at a distance of
approximately 1 metre from one another.
SOME OUTLET DUCT INSTALLATION EXAMPLES AND THEIR RELATIVE MAXIMUM
LENGTHS ARE SHOWN IN ANNEX "SECTION" D AT THE END OF THIS MANUAL.

31
INSTALLER Section (en)
7110102.03 (1-06/13)
10.1 CONCENTRIC DUCTS
This type of duct is used to discharge exhaust fumes and
draw combustion air both outside the building and if a LAS
ue is tted. The 90° coaxial bend allows the boiler to be
connected to a ue-air duct in any direction as it can be
rotated by 360° It can also be used as a supplementary
curve combined with a coaxial duct or a 45° curve.
If fumes are discharged outside the building, the ue-air
duct must protrude at least 18 mm from the wall to allow an
aluminium weathering surround to be tted and sealed to
avoid water inltrations.
• A 90° bend reduces the total duct length by 1 metre.
• A 45° bend reduces the total duct length by 0.5 metres.
• The rst 90° bend is not included when calculating the maximum available length.
Secure the intake pipes with two galvanised screws with a diameter of 4.2 mm and a maximum length of 19 mm.
Before securing the screws, make sure that at least 45 mm of the pipe is inserted into the gasket (see the gures in "SECTION"
D at the end of this manual).
Make sure there is a minimum downward slope towards the outside of 1 cm per metre of duct length.
Measure the diaphragm with the gauge.
MODEL Length (m) Using a DIAPHRAGM on
OUTLET DUCT (mm) “A”
1.24 F - 24 F
0 ÷ 1 Ø 43
1 ÷ 2 Ø 45
2 ÷ 5 No
18 F
1.14 F - 14 F
0 ÷ 1 Ø 41
1 ÷ 2 Ø 43
2 ÷ 5 Ø 45
10.2 SEPARATE DUCTS
This type of installation makes it possible to discharge
exhaust fumes both outside the building and into single ue
ducts. Comburent air can be drawn in at a different location
from that of the ue terminal.
The optional splitting accessory is xed to the boiler turret
(Ø 100/60 mm) and allows the air and fumes to enter/leave
the two separate ducts (Ø 80 mm). For further information,
read the assembly instructions supplied with the accessory.
The 90° bend is used to connect the boiler to the inlet and
outlet ducts, adapting them to various requirements. It can
also be used as a supplementary curve combined with a
duct or a 45° bend.
• A 90° bend reduces the total duct length by 0,5 metres.
• A 45° bend reduces the total duct length by 0,25 metres.
• The rst 90° bend is not included when calculating the maximum available length.
Make sure there is a minimum downward slope towards the outside of 1 cm per metre of duct length. In the event of installation
of the condensate collection kit, the angle of the drain duct must be directed towards the boiler.
Measure the diaphragm with the gauge.
A
CG_2117

7110102.03 (1-06/13) 32
INSTALLER Section (en)
MODEL Length (m)
(L1 + L2) Using a DIAPHRAGM on OUTLET DUCT (mm) “A” MODEL Length (m) (L1 + L2) Using a DIAPHRAGM on OUTLET DUCT (mm) “A”
1.24 F - 24 F
0 ÷ 4 Ø 43 18 F
1.14 F - 14 F
0 ÷ 15 Ø 41
4 ÷ 10 Ø 45 15 ÷ 25 Ø 43
10 ÷ 20 Ø 47 25 ÷ 30 Ø 45
20 ÷ 30 No
For the C52 type, do not t the ue and air duct terminals on opposite walls of the building.
If the discharge duct is longer than 6 metres, install the condensate collection kit, supplied as an accessory, near the boiler.
If tting a single ue duct, make sure it is adequately insulated (e.g.: with glass wool) wherever the duct passes through
building walls. For detailed installation instructions, consult the technical data provided with the accessories.
10.2.1 NOTES FOR INSTALLATIONS WITH SEPARATE OUTLETS
In particular installation situations with separate ducts,
vibrations may be generated in the appliance.
To solve this problems, a slot closed with pre-punched holes
on the outlet (Ref. A) has been prepared on the fumes
outlet. This can be easily removed by the Qualied Technical
Assistance Service without having to remove the outlet.
Removeknock-out A and check the appliance works correctly.
11.ELECTRICAL CONNECTIONS
This machine is only electrically safe if it is correctly connected to an efcient earth system in compliance with current safety
regulations.
Connect the boiler to a 230V single-phase earthed power supply using the supplied three-pin cable, observing correct LIVE-
NEUTRAL polarity.
Use a double-pole switch with a contact separation of at least 3 mm.
When replacing the power supply cable, t a harmonised "HAR H05 W-F" 3x0.75mm2 cable with a maximum diameter of 8 mm.
Access to the power supply terminal block
• remove the front panel of the boiler (secured at the bottom with two screws);
• turn the control box downwards;
• remove the metal guard from the control box;
• open the left-hand side of the cover and access the electrical connections area.
The 2A fast-blowing fuse is incorporated in the power supply terminal block (to check and/or replace the fuse, pull out the black
fuse carrier).
The terminal block is at high voltage. Before making connections, make sure the appliance is disconnected from the power
supply.
Respect polarity L (LIVE) - N (NEUTRAL).
(L) = Live (brown)
(N) = Neutral (light blue).
= Earth (yellow-green).
(1) (2) = contact for Room Thermostat.
A

33
INSTALLER Section (en)
7110102.03 (1-06/13)

11.1 CONNECTING THE ROOM THERMOSTAT
To connect the Room Thermostat to the boiler, proceed as follows:
• access the power terminal block as described in the ELECTRICAL CONNECTIONS section;
• remove the jumper on terminals (1) and (2);
• thread the two-wire cable through the grommet and connect it to these two terminals.
11.2 ACCESSORIES NOT INCLUDED IN THE SUPPLY
11.2.1 CONNECTING THE EXTERNAL PROBE
To connect the External Probe, supplied as an accessory, to the boiler, proceed as follows:
• access the power terminal block as described in the ELECTRICAL CONNECTIONS section;
• for heating and DHW models: connect the external probe to the two RED wires tted with faston covers;
• for heating only models: connect the external probe to the M2 terminal block, see the wiring diagrams in annex "SECTION" B
at the end of this manual;
• with the external probe connected, select the "kt" climate curve by pressing , selecting from the available ones (0...90),
see the curves chart in annex "SECTION" E at the end of this manual (the preset curve is 0).
KEY TO CURVE CHART Kt - "SECTION" E
Flow temp Outside temp
11.2.2 CONNECTING AN EXTERNAL STORAGE BOILER (for heating only models)
The DHW priority sensor NTC and the motor of the 3-way valve are not included in the kit of the appliance because they are
supplied as accessories.
CONNECTING THE STORAGE BOILER SENSOR
The boiler can be electrically connected to an external storage boiler. A diagram of the hydraulic connection of the external storage
boiler is shown in annex "SECTION" F. Connect the priority sensor NTC to terminals on terminal block M2. The sensitive
element of the NTC sensor must be inserted in the special well located on the storage boiler. Make sure that the exchange capacity
of the storage boiler coil is appropriate for the power of the boiler. Adjust DHW temperature (+35°C...+60°C) by pressing .
IMPORTANT: set parameter F03 = 003 as described in the SETTING PARAMETERS section.
KEY TO STORAGE BOILER CONNECTIONS (see diagram A in annex "SECTION" F at the end of this manual).
AHeating Unit EHeating water / Storage boiler return
BPowered 3-way valve FStorage boiler unit
CHeating water ow GDHW priority probe
DStorage boiler water ow
ELECTRICAL CONNECTION TO 3-WAY VALVE MOTOR
The 3-way valve motor and relative wiring harness are supplied separately in the form of a kit. Connect the plugs on the 3-way
valve wiring harness to terminals of the M2 terminal block on the boiler.
The anti-legionellosis function is NOT ENABLED. To enable it, set parameter F16 = 055...067 (setpoint 55...67°C) as described
in the SETTING PARAMETERS section.

7110102.03 (1-06/13) 34
INSTALLER Section (en)
12.GAS VALVE
12.1 GASCONVERSION
The Technical Assistance Service can convert this boiler to natural gas (G20) or LPG (G31). Carry out the following operations:
A) replace the main burner injectors;
B) parameterise the electronic board;
C) mechanically calibrate the gas valve pressure regulator;
D) electronically calibrate the gas valve;
E) nal checks.
A) Replace the main burner injectors
• Disconnect the boiler from the power supply;
• remove the front panel of the boiler;
• remove the screws (a) connecting the injector ramp to
the gas valve and burner;
• remove the injector ramp and the burner shield at the
same time (b);
• replace the ramp injectors making sure to fully tighten
them to prevent gas leaks. Injector diameters are
specied in the burner injector-pressure table.
• correctly reposition the injector ramp and the burner
shield (b);
• secure the screws connecting the injector ramp to
the burner and gas valve. Make sure the o-ring (c)
between the gas valve and the injector ramp is correctly
positioned;
• check the gas circuit for leaks.
B) Parameterise the electronic board
• Power the boiler;
• set the (Fxx) parameters with the values indicated in the following table, depending on the gas type following the procedure
described in the SETTING PARAMETERS section.
G20 G31
F02 0 1
F08 100
F09 100
F18 18
F45 1
F48 100
F64 1
C) Mechanically calibrate the gas valve pressure regulator
• Connect the positive pressure test point of a pressure gauge, possibly water-operated, to the
gas valve pressure test point (Pb);
• open the gas tap and switch the boiler to the "Winter" mode;
• open a hot water tap that can provide a ow rate of at least 10 litres a minute or make sure
there is maximum heat demand;
C1) Adjust to nominal heat output:
• remove the modulator cover;
• adjust the tube brass screw (a) until the pressure values shown in the burner injector-pressure
table correspond to the nominal heat output;
• make sure that the dynamic inlet pressure of the boiler, measured at the gas valve pressure
test point (Pa) is correct, as indicated in the TECHNICAL SPECIFICATIONS section.
C2) Adjust to reduced heat output:
• disconnect the modulator power cable and adjust the screw (b) until the pressure values
corresponding to the reduced power indicated in the burner injector-pressure chart are
obtained;
• reconnect the wire;
• mount the modulator cover and seal.
a
b
c
CG_2451
(b)
(a)

35
INSTALLER Section (en)
7110102.03 (1-06/13)
Burner injector-pressure table
1.24 F - 24 F 18 F - 14 F - 1.14 F
Gas type G20 G31 G20 G31
Injector diameter (mm) 1.35 0.85 1.18 0.77
Burner pressure (mbar*)
REDUCED HEAT OUTPUT 2.1 5.4 3.6 7.8
Burner pressure (mbar*)
RATED HEAT OUTPUT 11.8 28.8 11.6 24.7
N° injectors 11 11
* 1 mbar = 10.197 mm H2O
D) Electronically calibrate the gas valve
D1) Electronically adjust to reduced heat output:
• set parameter F08-F09 = 0 following the procedure described in the SETTING PARAMETERS section;
• open a hot water tap that can provide a ow rate of at least 10 litres a minute or make sure there is maximum heat demand;
• slowly increase (not more than 2 points at a time) the value of parameter F45 until the pressure read with the pressure gauge
increases; then reduce the value of F45 by 2 points and press to save.
D2) Electronically adjust to nominal heat output:
• set parameters F08-F09 = 100, F48 = 50;
• open a hot water tap that can provide a ow rate of at least 10 litres a minute or make sure there is maximum heat demand;
• slowly increase (not more than 2 points at a time) the value of parameter F48 until the pressure read with the pressure gauge
reaches the value indicated in the burner pressure/injectors table (NOMINAL HEAT OUTPUT); then increase the value of F48
by 2 points;
• set parameters F64 = 0, F18 = 0 and press to save;
• turn off the two-pole switch to disconnect the boiler from the power supply for at least 5 seconds;
• put the front panel back in place.
E) Final checks
• Note down the conversion on the boiler rating plate, specifying the type of gas and indicating that calibration was performed.
After performing electronic calibration, set parameter F08-F09 as shown in the table below.
24 F 1.24 F – 18 F 14 F 1.14 F
G20 - G25.1 G31 G20 - G25.1 G31 G20 - G25.1 G31 G20 - G25.1 G31
F08 055 060 100 050 060 050 060
F09 100 100 100 050 060
If ashes on the display when calibrating the gas valve, disconnect the boiler from the power supply and repeat the
calibration procedure starting from point B).
12.2 REPLACING THE GAS VALVE
When replacing the gas valve, perform the following operations:
• switch off the boiler;
• close the gas inlet valve;
• replace the gas valve;
• open the gas inlet valve and make sure there are no gas leaks;
• perform the operations described in points B, C, D of the GAS CONVERSION section.
12.3 GAS VALVE CALIBRATION
To calibrate the gas valve, perform the operations described in points B, C, D of the GAS CONVERSION section.

7110102.03 (1-06/13) 36
INSTALLER Section (en)
12.4 REPLACING THE ELECTRONIC BOARD
When replacing the electronic valve, perform the following operations:
• disconnect the boiler from the mains power supply.
• remove the front panel of the boiler;
• replace the electronic board;
• power the boiler;
• set parameters F03 and F12 as described in the SETTING PARAMETERS section according to the boiler model indicated on
the rating plate.
Electronically calibrate the gas valve as follows:
• connect the positive pressure test point of a pressure gauge, possibly water-operated, to the gas valve pressure test point (Pb);
• open the gas tap and switch the boiler to the Winter mode;
• open a hot water tap that can provide a ow rate of at least 10 litres a minute or make sure there is maximum heat demand;
• press buttons and together for 10 seconds. Press when "ON" appears on the display;
• press when "INF" appears on the display. The modulator current percentage ashes on the display;
• press when the pressure gauge measures an increase from 0.2 to 0.4 mbar with respect to the value indicated in the burner
pressure/injectors table (REDUCED POWER); the modulator current percentage appears on the display;
• press when the pressure measured by the pressure gauge reaches the value indicated in the burner pressure/injectors
table (NOMINAL HEATING OUTPUT);
• after calibration, "MEM" ashes on the display for 5 seconds.
If a pressure gauge is unavailable, the automatic gas valve calibration procedure can be performed as follows:
• open the gas tap and switch the boiler to the Winter mode;
• keep the front panel of the boiler closed;
• open a hot water tap that can provide a ow rate of at least 10 litres a minute or make sure there is maximum heat demand;
• press buttons and together for 10 seconds. Press when "ON" appears on the display;
• after calibration, "MEM" ashes on the display for 5 seconds.
If one of the following symbols: C01 – C02 – C03 – C04 – C05 appears after calibration, repeat the gas valve calibration
procedure.
Check the mechanical calibration of the gas valve pressure adjuster, as described in the GAS CONVERSION section, before
electronically calibrating the gas valve
13.VISUALISATION OF PARAMETERS ON THE DISPLAY ("INFO" FUNCTION)
Press for at least 6 seconds to display information concerning boiler operation.
When the “INFO” function is enabled, the message “A00” alternating with the boiler delivery temperature, is shown on the
display:
CG_1808
Press buttons to display the following information:
A00: current heating delivery temperature (°C);
A01: current DHW temperature (°C);
A02: current external temperature (°C) (with external sensor connected);
A03: current fumes temperature (°C);
A04: instantaneous (%) value of the gas valve control signal;
A05: power range (%) (MAX CH);
A06: heating setpoint temperature (°C);
A07: DHW temperature setpoint (°C);
A08: last error that occurred in the boiler;
A09: not used;
A10: not used.
This function remains active for 3 minutes. It is possible to interrupt the “INFO” function in advance by pressing or turning off
the power to the boiler.

37
INSTALLER Section (en)
7110102.03 (1-06/13)
14.PARAMETER SETTINGS
To set the boiler parameters, press and together and hold down for at least 6 seconds. When the function is activated, the
display shows “F01” alternated with the value of the parameter.
Edit parameters
• To scroll the parameters press ;
• Press buttons to change the single parameter value;
• Press to save changes, the display shows “MEM”;
• Press to leave the function without saving, the display shows "ESC".
ALL MODIFIED PARAMETERS SHOULD BE NOTED DOWN IN THE TABLE AT THE END OF THIS MANUAL.
Parameter Description of parameters Factory settings
14 F 1.14 F 18 F 24 F 1.24 F
F01 Boiler type 010=airtight chamber 010
F02 Gas used 000=NATURAL GAS - 001=LPG - 002=gas G25.1 000 - 001
F03
Hydraulic system
000 = instantaneous appliance
003 = appliance with external storage boiler
004 = heating only appliance
000 004 000 000 004
F04 - F05 Setting programmable relays 1 and 2 (See SERVICE instructions)
000=no associated function 000
F06 Maximum heating setpoint setting (°C) 000=85°C (Burner goes out at 90 °C)
001=45°C (Burner goes out at 50 °C) 000
F07 DHW inlet priority conguration 000
F08 CH max. output (0-100%) 50
(60 LPG) 50 (60 LPG) 100 55 (60 LPG) 100
F09 DHW max. output (0-100%) 100 50
(60 LPG) 100 100 100
F10 CH and DHW min. heat output (0-100%) 000
F11 Delay prior to new ignition in CH mode
000=10 seconds - 001...010 = 1...10 minutes 003
F12 Identication of boiler model 009 009 008 007 007
F13 Pump overrun time in heating mode
000=10 seconds - 001...240 = 1...240 minutes 003
F14 Test of correct DHW probe position 000=Disabled - 001=Always
enabled 000
F15 Factory setting 000
F16 Anti-legionellosis function
000 = Disabled - 055…067 = Enabled (setpoint 55…67°C) 000
F17 Hydraulic pressure switch conguration 001
F18 Release parameters for SERVICE 000
Parameter Description of parameters
Factory settings Parameter Description of
parameters
Factory settings
14 F - 1.14 F - 18 F
24 F - 1.24 F 14 F - 1.14 F - 18 F 24 F - 1.24 F
F19 Factory setting 001 F44 Factory setting 000
F20 Factory setting 000 F45 Factory setting (this value depends on
valve calibration)
F21 Factory setting 030
F22 Factory setting 110 F46 Factory setting 015
F23 Factory setting 010 F47 Factory setting 000
F24 Factory setting 005 F48 Factory setting (this value depends on
valve calibration)
F25 Factory setting 000
F26 Factory setting 165 F49 Factory setting 105
F27 Factory setting 010 F50 Factory setting 100
F28 Factory setting 070 F51 Factory setting 005
F29 Factory setting 020 F52 Factory setting 020
F30 Factory setting 000 F53 Factory setting 100
F31 Factory setting 180 F54 Factory setting 000
F32 Factory setting 170 F55 Factory setting 003
F33 - F34 Factory setting 004 F56 Factory setting 025
F35 Factory setting 015 F57 Factory setting 000
F36 Factory setting 020 F58 Factory setting 000

7110102.03 (1-06/13) 38
INSTALLER Section (en)
F37 Factory setting 003 F59 Factory setting 005
F38 Factory setting 000 F60 Factory setting 120
F39 Factory setting 067 F61 Factory setting 015
F40 Factory setting 070 F62 Factory setting 030
F41 Factory setting 010 F63 Factory setting 025
F42 Factory setting 042 F64 Factory setting 000
F43 Factory setting 001
15.TROUBLESHOOTING SERVICE FAULTS
The faults shown on the display are identied with the symbol "E" and a number (fault code). For a
complete list of faults, see the following table.
If "R" appears on the display the fault must be RESET by the user.
To reset, press and hold down for at least 2 seconds. If this fault persists, call theAuthorised Service
Centre.
CODE
DISPLAYED FAULT POSSIBLE REASON SERVICE ACTION
E01 Shut down for ignition
failure.
• No inlet gas pressure.
• Ignition switch-ame sensor wire
interrupted.
• Flame sensing electrode faulty or
incorrectly positioned.
• Gas valve faulty.
• Electronic board faulty.
• Check that the gas valve is open and there is no air in
the gas supply circuit.
• Check the gas supply pressure.
• Check the wire is uninterrupted and makes good
contact with the ame sensing electrode and the
ignition switch.
• Check the connections between the gas valve and the
electronic board.
• Check the ame sensing electrode is in good
condition and in the right position (see the
POSITIONING THE IGNITIONAND FLAME-
SENSING ELECTRODE section).
E02 Shut down by safety
thermostat.
• No water in the primary circuit
(pump blocked or exchanger
obstructed).
• Limit thermostat faulty.
• Limit thermostat wiring
interrupted.
• CH ow NTC probe faulty.
• Electronic board faulty.
• Check pump operation (unscrew the front cap and
release the pump impeller with a screwdriver).
• Check the pump power input wiring.
• Check that the limit thermostat is undamaged and
replace it if necessary.
• Check the continuity of the limit thermostat wiring.
• Check the CH ow NTC probe (*).
• Check whether the exchanger is clogged.
E03 Board conguration error. • Parameter F43 has not been set
correctly.
• Set parameter F43 with the value indicated in the
table in the SETTING PARAMETERS section.
E04 Safety error due to
ignition failure or frequent
ame loss.
• See the reasons indicated in E01.
• See the reasons indicated in E42.
• See the actions indicated in E01.
• See the actions indicated in E42.
E05 Flow sensor failure. • CH ow NTC probe faulty (circuit
open or shorted).
• CH ow probe wiring interrupted
or shorted.
• Check the CH ow NTC probe (*).
• Check the continuity of the CH ow probe wiring.
• Make sure the wiring has not shorted.
E06 DHW sensor fault. • DHW ow NTC probe faulty
(circuit open or shorted).
• DHW ow probe wiring
interrupted or shorted.
• Check the DHW NTC probe (*).
• Check the continuity of the DHW probe wiring
• Make sure the wiring has not shorted.
E07 Fumes NTC probe fault. • Fumes NTC probe faulty (circuit
open).
• Fumes probe wiring interrupted.
• Check the fumes NTC probe (**).
• Check the continuity of the fumes probe wiring
E08 Error in the ame
amplication circuit.
• The electronic board is not
earthed.
• Electronic board faulty.
• Check the continuity of the earth connections between
the electronic board (X4 connector) and the power
supply terminal block.
E09 Error in the gas valve
safety circuit.
• Electronic board faulty. • Replace the electronic board.
E10 No hydraulic pressure
switch enable.
• CH circuit pressure < 0.5 bar
• Hydraulic pressure switch faulty.
• Hydraulic pressure switch wiring
faulty.
• If the pressure in the CH circuit is < 0.5 bar, perform
lling (see the FILLING THE SYSTEM section).
• Check the hydraulic pressure switch works correctly.
• Check the continuity of the hydraulic pressure switch
wiring
E22 Switching off due to power
supply reductions.
• Supply voltage V < 162V
(automatic reset at V> 168V)
• Electronic board faulty.
• Check whether the power supply reductions are due
to reasons other than the boiler. If so, contact the
electricity provider.

39
INSTALLER Section (en)
7110102.03 (1-06/13)
CODE
DISPLAYED FAULT POSSIBLE REASON SERVICE ACTION
E25 No water safety trip. • No water in the CH circuit
(pump blocked or exchanger
obstructed).
• CH ow NTC probe faulty.
• Electronic board faulty.
• Check pump operation (unscrew the front cap and
release the rotor with a screwdriver).
• Check the pump power input wiring.
• Check the CH ow NTC probe (*).
• Check whether the exchanger is clogged.
E26 CH delivery NTC probe
overheating safety trip.
• See the reasons indicated in E25. • See the actions indicated in E25.
E35 Parasite ame (ame
error).
• The electronic board is not
earthed.
• Flame sensing electrode faulty or
incorrectly positioned.
• Electronic board faulty.
• Check the continuity of the earth connections between
the electronic board (X4 connector) and the power
supply terminal block.
• Check the ame sensing electrode is in good
condition and correctly positioned (see the
POSITIONING THE IGNITIONAND FLAME-
SENSING ELECTRODE section).
E36 Fumes NTC probe fault. • Fumes NTC probe faulty
(shorted).
• Fumes probe wiring shorted.
• Check the fumes NTC probe (**).
• Make sure the fumes probe wiring has not shorted.
E40 - E41 Shutdown due to probable
obstruction of air-ue duct
or insufcient gas inlet
pressure.
• No inlet gas pressure.
• Gas valve modulator wires not
connected.
• Flame sensing electrode faulty or
incorrectly positioned.
• Fumes NTC probe faulty or
incorrectly positioned
• Air-ue duct obstructed.
• Gas valve faulty.
• Electronic board faulty.
• Check the gas supply pressure (for natural gas
Palim.>9mbar).
• Check the connection of the gas valve modulator
wiring to the electronic board.
• Check that the pressure at the burner has been
correctly calibrated (see the GAS VALVE section).
• Check the ame sensing electrode is in good
condition and correctly positioned (see the
POSITIONING THE IGNITIONAND FLAME-
SENSING ELECTRODE section).
• Check the fumes NTC probe (**).
• Make sure the air and ue ducts are not obstructed
and have been correctly installed (they must not
exceed the prescribed maximum lengths and must
be tted with the correct diaphragm – see the
INSTALLING THE DUCTS section).
E42 No ame. • Fan not working (fault or no
power).
• Air-ue duct completely
obstructed.
• Electronic board faulty.
• Check that the fan power supply wiring is connected
to the electronic board.
• Make sure the air and ue ducts are not obstructed
and have been correctly installed (they must not
exceed the prescribed maximum lengths and must
be tted with the correct diaphragm – see the
INSTALLING THE DUCTS section).
E43 Shutdown due to probable
obstruction of air-ue duct
or insufcient gas inlet
pressure.
• See the causes indicated in E40
- E41
• Input voltage V<180V
(automatically resets at V>185V
or by pressing “R”).
• Electronic board faulty.
• See the actions indicated in E40 - E41.
• Check whether the power supply reductions are due
to reasons other than the boiler. If so, contact the
electricity provider
E50 Shutdown due to fumes
NTC probe tripping for
overheating.
• Fumes temperature>180°C.
• Insufcient heat exchange on the
water/fumes exchanger.
• Fumes NTC probe faulty.
• Electronic board faulty.
• Check the heat exchange of the water/ fumes
exchanger: insufcient circulation or presence of
scale.
• Check the fumes NTC probe (**).
E55 Gas valve not
electronically calibrated
• The electronic board has not
been replaced and the gas valve
has not yet been electronically
calibrated.
• Electronically calibrate the gas valve (parameters F45
and F48) as described in the GAS VALVE section
E62 Safety shutdown if the
ame signal or fumes
temperature fail to
stabilise
• Flame sensing electrode faulty or
incorrectly positioned.
• Fumes NTC probe faulty.
• Electronic board faulty.
• Check the wire is uninterrupted and makes good
contact with the ame sensing electrode and the
ignition switch.
• Check the ame sensing electrode is in good
condition and correctly positioned (see the
POSITIONING THE IGNITIONAND FLAME-
SENSING ELECTRODE section).
• Check the fumes NTC probe (**).
E65 Safety shutdown if the air-
ue duct obstruction test
fails frequently.
• See the causes indicated in E40
- E41.
• See the actions indicated in E40 - E41.

7110102.03 (1-06/13) 40
INSTALLER Section (en)
CODE
DISPLAYED FAULT POSSIBLE REASON SERVICE ACTION
E98 Electronic board
parameters incorrectly
congured
• The electronic board has been
replaced and not yet calibrated
for the boiler model.
• Parameters F03 and F12 have
not been set or have been
incorrectly set.
• Set parameters F03 and F12 with the values indicated
in the table in the SETTING PARAMETERS section
according to the boiler model indicated on the rating
plate.
Flashing
Boiler operating at
reduced power.
• No inlet gas pressure.
• Gas valve modulator wires not
connected.
• Flame sensing electrode faulty or
incorrectly positioned.
• Air-ue duct partially obstructed.
• Gas valve faulty.
• Electronic board faulty.
• Check the gas supply pressure
• (for natural gas Palim.>9mbar).
• Check the connection of the gas valve modulator
wiring to the electronic board.
• Check that the pressure at the burner has been
correctly calibrated (see the GAS VALVE section)
• Check the ame sensing electrode is in good
condition and correctly positioned (see the
POSITIONING THE IGNITIONAND FLAME-
SENSING ELECTRODE section).
• Make sure the air and ue ducts are not obstructed
and have been correctly installed (they must not
exceed the prescribed maximum lengths and must
be tted with the correct diaphragm – see the
INSTALLING THE DUCTS section).
CH = central heating
DHW = domestic hot water
(*) DHW NTC and CH delivery probe: cold resistance value: approximately 10 kΩ @ 25° C (resistance decreases as temperature rises).
(**) NTC fumes probe: cold resistance value: approximately 49 kΩ @ 25° C (resistance decreases as temperature rises).

41
INSTALLER Section (en)
7110102.03 (1-06/13)
16.ADJUSTMENT AND SAFETY DEVICES
The boiler has been designed in full compliance with European reference standards and in particular is equipped with the following:
• Limit thermostat
Thanks to a sensor placed on the CH ow line, this thermostat interrupts the ow of gas to the burner if the water in the primary
circuit overheats. In these conditions, the boiler is blocked and only after the fault has been eliminated can it be ignited again by
pressing for at least 2 seconds.
It is forbidden to disable this safety device.
• Electronic fumes outlet control
The boiler is tted with an electronic function which controls the fumes outlet.
• Flame ionisation detector
The ame sensing electrode, located in the centre of the burner, guarantees safety of operation in case of gas failure or incomplete
ignition of the burner.
In these conditions, the boiler is blocked after 3 ignition attempts.
Press for at least 2 seconds to re-establish normal operating conditions.
• Hydraulic pressure switch
This device allows the main burner to be ignited only if system pressure is higher than 0.5 bar.
• Heating circuit pump post-circulation
The electronically-controlled pump post-circulation function lasts 3 minutes and is enabled, in the heating mode, if the ambient
thermostat causes the burner to go out.
• Anti-freeze device
The electronic boiler management system includes a "frost protection" function for the heating and DHW systems which, when
ow temperature falls below 5°C, operates the burner until a ow temperature of 30°C is reached. This function is enabled when
the boiler is switched on, the gas supply is open and the system is correctly pressurised.
• Water not circulating in primary circuit (pump probably blocked)
If there is insufcient or no water circulating in the primary circuit, the boiler blocks and the error code E25 is shown on the display.
• Pump anti-block function
If no heat demand is received in the heating and/or DHW modes for 24 consecutive hours, the pump will automatically start and
operate for 10 seconds.
This function is operative when the boiler is powered.
• Hydraulic safety valve (heating circuit)
This device is set to 3 bar and is used for the heating circuit.
Connect the safety valve to a drain trap. Do not use it to drain the heating circuit.
17.PUMP CAPACITY/ HEAD
This is a high static head pump t for installation on any type of single or double-pipe heating systems. The automatic air valve
incorporated in the pump allows quick venting of the heating system.
KEY TO PUMP CHARTS - “SECTION” E
QRATE OF FLOW
HHEAD

7110102.03 (1-06/13) 42
INSTALLER Section (en)
18.ANNUAL SERVICING
If the boiler was operating, wait for the combustion chamber and pipes to cool down.
Before commencing any maintenance operations, make sure the boiler is disconnected from the power supply. Afterwards,
move the knobs and/or operating parameters of the boiler to their original positions.
Do not clean the boiler with abrasive, aggressive and/or easily ammable substances (such as petrol, acetone, etc.).
To optimise boiler efciency, carry out the following annual controls:
• Check the appearance and airtightness of the gaskets of the gas and combustion circuits;
• Check the state and correct position of the ignition and ame-sensing electrodes;
• Check the state of the burner and make sure it is rmly xed;
• Check for any impurities inside the combustion chamber. Use a vacuum cleaner to do this;
• Check the gas valve is correctly calibrated;
• Check the pressure of the heating system;
• Check the pressure of the expansion vessel;
• Check the fan works correctly;
• Make sure the ue and air ducts are unobstructed;
18.1 HYDRAULIC UNIT
For special areas, where the water is harder than 20 °F (1 °F = 10 mg calcium carbonate per litre of water), install a polyphosphate
dispenser or an equivalent treatment system, compliant with current regulations.
18.2 POSITIONING THE ELECTRODE
3 ÷ 4 mm
CG_2399
L
The electrode must completely cross the width (L) of the burner element.
18.3 CLEANING THE FILTERS
The DHW and CH lters are housed inside removable cartridges (see gure in annex "SECTION" F at the end of this manual).
The CH cartridge is located on the CH return line (F) while the DHW cartridge is on the cold water inlet (E). To clean the lters,
proceed as described below:
• switch off the boiler;
• shut the DHW inlet valve;
• drain the water in the CH circuit by opening valve (A);
• remove the clip (1-E/F) from the lter as illustrated in the gure and take out the cartridge (2-E/F) containing the lter, taking
care not to apply excessive force;
• to extract the heating lter cartridge, rst remove the 3-way valve motor (1-2G);
• eliminate any impurities and deposits from the lter;
• reposition the lter in the cartridge and put it back into its housing, securing it with the clip.
• The NTC DHW sensor is positioned in point (D).
when replacing and/or cleaning the O-rings on the hydraulic assembly, only use Molykote 111 as a lubricant, not oil or
grease.