Ariston NEXT EVO X SFT Series User manual

NEXT EVO X SFT
HOT WATER I HEATING I RENEWABLE
ECO
USER’S MANUAL
INSTALLATION AND SERVICING INSTRUCTIONS
INSTANTANEOUS GAS WATER HEATER

User’s manual
CE labelling .................................................................3
General warnings ........................................................4
Safety regulations........................................................ 5
Control panel ...............................................................7
Display......................................................................... 7
Ignition procedure........................................................ 8
Water temperature adjustment .................................... 8
ECO mode................................................................... 9
Switch-off procedure....................................................9
Appliance shut-off conditions..................................... 10
Anti-freeze protection ................................................ 11
Change gas type ....................................................... 11
Maintenance.............................................................. 11
Installation and servicing instructions
(Only for qualied technicians).............................. 12
This product conforms to Directive
WEEE 2012/19/EU.
The symbol of the crossed waste paper basket
on the appliance indicates that at the end of its
working life the product should be disposed of
separately from normal domestic household rubbish, it must
be disposed of at a waste disposal centre with dedicated
facilities for electric and electronic appliances or returned to
the retailer when a new replacement product is purchased.
The user is responsible for the disposal of the product at the
end of its life at an appropriate waste disposal centre.
The waste disposal centre (which using special treatment and
recycling processes effectively dismantles and disposes of
the appliance) helps to protect the environment by recycling
the material from which the product is made.
For further information about waste disposal systems visit
your local waste disposal centre or the retailer from which the
product was purchased.

/ 3
USER’S MANUAL
Dear Customer,
Thank you for choosing an ARISTON gas water heater.
We guarantee that your instantaneous water heater is a
reliable and technically sound product.
This manual provides detailed instructions and
recommendations for proper installation, use and
maintenance.
Remember to keep this manual in a safe place for future
reference i.e. by the gas meter.
Your local ARISTON Servicing Centre is at your
complete disposal for all requirements.
WARNING!!
Water with a temperature higher than 50°
cause serious burns.
Always verify water temperature before
use.
IMPORTANT!
If the unit is installed in areas with the
presence of hard water (> 200 mg / l) it is
necessary to install a water softener to
reduce the precipitation of limestone in the
heat exchanger.
The warranty does not cover damage
caused by the limestone.
WARNING!!
The device must be activated only in presence
of water in the exchanger.
CE labelling
The CE mark guarantees that the appliance conforms to
the following directives:
- 2016/426/EU relating to gas appliances
- 2014/30/EU relating to electromagnetic compatibility
- 2014/35/EU relating to electrical safety
- 2009/125/CE - Energy related Products
- 813/2013 - EU Regulation
This book (user’s and installation manual) is
an integral and essential component of the
product.
Must be kept carefully by you and will always
accompany the appliance in the event of
its sale to another owner or user and / or
transfer to another installation.
Carefully read the instructions and warnings
contained in this manual as it contains
important information about safe installation,
operation and maintenance
This appliance is designed to produce hot water for domestic
use.
It should be connected to a distribution network for domestic hot
water that must be compatible with its performance and power
levels.
The use of the appliance for purposes other than those
specied is strictly forbidden. The manufacturer cannot be held
responsible for any damage caused by improper, incorrect and
unreasonable use of the appliance or by the failure to comply
with the instructions given in this manual.
Installation, maintenance and all other interventions must be
carried out in full conformity with the governing legal regulations
and the instructions provided by the manufacturer.
Incorrect installation can harm persons, animals and
possessions; the manufacturing company shall not be held
responsible for any damage caused as a result.
In the event of a fault and/or malfunction, turn the appliance off,
turn off the gas cock and do not attempt to repair it yourself.
Contact a qualied professional instead.
Before any maintenance or repair work is performed on the
appliance, make sure you have disconnected it from the
electricity supply by switching the external bipolar switch to the
“OFF” position and removing the fuse.
All repairs, which should only be performed using original spare
parts, should be carried out by a qualied professional.
Failure to comply with the above instructions could compromise
the safety of the appliance and invalidate all liability on the part
of the manufacturer
In the event of any maintenance or other structural work in the
immediate vicinity of the ducts or ue gas exhaust devices and
their accessories, switch the appliance off by switching the
external bipolar switch to the “OFF” position and shutting off the
gas control valve.
When the work has been completed, ask a qualied technician
to check the efciency of the ducting and the devices.
If the appliance should be out of use for a prolonged period, it is
recommended that the electrical power supply be disconnected
and that the external gas cock be closed. If low temperatures
are expected, the appliance and system pipe work should be
drained in order to prevent frost damage.
When permanently deactivating the appliance, make sure that
the operations are carried out by qualied technical professional.
Turn the appliace off and turn the external switch “OFF” to clean
the exterior parts of the appliance.
No ammable items should be left or used in the vicinity of the
appliance.
Do not allow children or inexperienced persons to use the
appliance without supervision.

4/
USER’S MANUAL
Safety regulations
Key to symbols:
Failure to comply with this warning
implies the risk of personal injury, in
some circumstances even fatal.
Failure to comply with this warning
implies the risk of damage, in some
circumstances even serious, to
property, plants or animals.
Do not perform operations which involve
opening the appliance.
Electrocution from live components.
Personal injury caused by burns due
to overheated components, or wounds
caused by sharp edges or protrusions.
Do not perform operations which involve
removing the appliance from its installation
space.
Electrocution from live components.
Flooding caused by water leaking from
disconnected piping.
Explosions, res or intoxication caused by
gas leaking from disconnected piping.
Do not damage the power supply
cable.
Electrocution from live uninsulated wires.
Do not leave anything on top of the
appliance.
Personal injury caused by an object falling
off the appliance as a result of vibrations.
Damage to the appliance or items
underneath it caused by the object falling
off as a result of vibrations.
Do not climb onto the appliance.
Personal injury caused by the appliance
falling.
Damage to the appliance or any objects
underneath it caused by the appliance
falling away from its installation space.
Do not climb onto chairs, stools, ladders
or unstable supports to clean the
appliance.
Personal injury caused by falling from
a height or cuts (stepladders shutting
accidentally).
Do not attempt to clean the appliance
without rst switching it off and turning
the external switch to the off position.
Electrocution from live components.
Do not use insecticides, solvents or
aggressive detergents to clean the
appliance.
Damage to plastic and painted parts.
Do not use the appliance for any use
other than normal domestic use.
Damage to the appliance caused by
operation overload.
Damage caused to objects treated
inappropriately.
Do not allow children or inexperienced
individuals to operate the appliance.
Damage to the appliance caused by
improper use.
If you detect a smell of burning or smoke
coming from the appliance, disconnect
it from the electricity supply, turn off the
main gas valve, open all windows and call
for assistance.
Personal injury caused by burns, smoke
inhalation, intoxication.
If there is a strong smell of gas, turn off the
main gas valve, open all windows and call
for assistance.
Explosions, res or intoxication.
ATTENTION
This appliance can be used by children
aged from 8 years and above and person
with reduced physical, sensory or mental
capabilities or lack of experience and
knowledge if they have been given supervision
or instruction concerning use of the appliance
in a safe way and understand the hazards
involved. Children shall not play with the
appliance. Cleaning and user maintenance
shall not be made by children without
supervision.

/ 5
USER’S MANUAL
Display
Key:
1. Display
2. Temperature Buttons
(Used to select hot water delivery temperature).
3. Energy saving button
4. ON/OFF button
WARNING
Installation, rst ignition and maintenance work
must be performed by qualied personnel only,
in accordance with the instructions provided.
Incorrect installation may harm individuals,
animals or property; the manufacturer will not
be held responsible for any damage caused as
a result.
- Water set temperature
indication (°C)
- Signal error codes
Flame presence signal
Energy saving signal
Control Panel
ECO
1
2
4
3

6/
USER’S MANUAL
Ignition procedure
- ensure that the valve located on the cold water tting
is open
- ensure that the gas valve is open
- ensure that the device is
powered by electric current.
Press ON/OFF button “4”, the
display will light up.
The device is ready to operate
The set temperature is indicated
on the display.
By opening the hot water valve,
the device automatically starts
operating.
The display shows the set
temperature and the ame
indicates the burner ignition.
Water temperature adjustment
Press or to set the hot
water temperature.
The new value will be indicated on
the display
It’s possible to increase the temperature up to 65 °C
To set the water temperature from 35 to 48 °C press the
+ button repeatedly. Pressing and releasing will trigger a
rise of 1 degree Celsius.
From 48 to 65 °C see the table.
WARNING!!
Water with a temperature higher than 50°
can cause serious burns.
Always verify water temperature before
use.
Note: If the device does not operate, ensure that the gas
and/or cold water valves are open.
Ensure that the device is electrically powered.
When closing the valve, the device automatically switches
off and the ame symbol disappears from the display.
ECO
Switching off procedure
Press the ON/OFF button, to switch off the appliance.
To switch off the completely, turn the outer electric switch
in the off position. Close the gas valve.
ECO mode
To activate the ECO mode press
the button 3.
To increase or decrease the
temperature press the button 2
or .
When the ECO mode is activated
the symbol appear on the
dislpay.
To exit from ECO mode is necessary to push the button 3
when the appliance is in stand-by mode.
T range D T setting
35-48° C 1° C Push button
48-50° C 2° C Push button for 5 sec
50-55° C 5° C Push “+” button
55-60° C 5° C Switch OFF the machine and
then push button for
5 sec
60-65° C 5° C Push button
Child lock function
It’s necessary switch OFF the appliance to reset the
temperature range. Afterwards the temperature range will
revert back to 35-48° C.

/ 7
USER’S MANUAL
Appliance shut-off conditions
The appliance is protected from
malfunctions by means of internal
checks performed by the electronic
P.C.B., which stops the appliance
from operating if necessary.
In case of shut-off a code appear on
the display – see table below.
To restore the system, turn the unit
off and back on again.
Error table
Anti-freeze protection
Should the appliance be installed where pipes are
subjected to freezing, it is recommended to empty it.
Proceed as indicated below:
- Turn the outer electrical switch to the OFF position
- Close the gas stopcock
- Close the cold water inlet valve
- Open the DHW valves until both the device and pipes
are completely emptied.
To ll the device again, open the cold water inlet valve
together with DHW valves until the water exits.
Error
code Description
After pressing the ON /
OFF button, the display
turns off
- Check that the unit is
electrically powered.
A1 No ame detected
Ignition fault
- Check that the gas
cock is open
- Press the ON / OFF
button.
IF THE APPLIANCE WON’T START AGAIN OR
STOPS REPEATEDLY, ONCE YOU’VE CARRIED
OUT THE RELEVANT CHECKS
, CLOSE THE
GAS VALVE, TURN THE OUTER ELECTRIC
SWITCH IN THE OFF POSITION AND
CONTACT A QUALIFIED TECHNICIAN.
SHOULD THE ERROR NOT BE ELIMINATED,
DO NOT ACTIVATE THE APPLIANCE.
Change of gas type
Our instantaneous water heaters are designed to function
either with Natural Gas (methane) or LPG gas. If you
need to change from one gas to the other, one of our
Authorised Service Centres must be contacted to convert
the appliance.
Maintenance
Schedule an annual maintenance check-up for the
appliance with a qualied person.
Correct maintenance always results in savings in the cost
of running the system.
Failure to arrange an annual service for the appliance will
invalidate the second year of the manufacturers warranty.
Disposal and recycling of the unit.
Our products are designed and manufactured for most of
the components to be made of recyclable material.
The unit and its accessories have to be adequately
disposed of and the various materials differentiated,
where possible.
The packaging used for the transport of the unit must be
disposed of by the installer / dealer.
ATTENTION!!
Recycling and disposal of the unit and the accessories
must be made as required by regulations.

Installation and servicing instructions
(Only for qualied technicians)
Overview................................................................................. 13
Advice for the installer ............................................................. 13
Safety regulations.................................................................... 14
Product descrption................................................................ 20
Overall view............................................................................. 20
Overall dimensions.................................................................. 21
Installation.............................................................................. 22
Before installing the appliance................................................. 22
Installation location.................................................................. 23
Minimum clearences................................................................ 23
Gas connection........................................................................ 24
Water connection..................................................................... 24
View of hydraulic connections ................................................. 24
Excessive pressure device...................................................... 25
Water circuit diagram............................................................... 26
Flue discharge/Air intake duct connections............................. 27
Table of ue gas exhaust duct lengths .................................... 28
Type of air suction/ue gas exhaust ducting............................ 28
Electrical connections.............................................................. 29
Electrical diagram.................................................................... 30
Commissioning...................................................................... 31
Ignition procedure.................................................................... 31
Electricity supply...................................................................... 31
Filling the hydraulic circuit ....................................................... 31
Gas supply............................................................................... 31
First Ignition............................................................................. 32
Checking the gas settings ....................................................... 33
Supply presure check.............................................................. 33
Checking the maximum/minimum burner pressure................. 33
Checking slow ignition power .................................................. 34
Gas settins table...................................................................... 35
Gas conversion ....................................................................... 35
Appliance protection devices............................................... 36
Table summarising error codes ............................................... 36
Maintenance........................................................................... 37
Instructions for opening the casing and performing
an internal inspection............................................................ 37
General comments .................................................................. 38
Operational test ....................................................................... 39
Draining procedures ................................................................ 39
Information for the user ........................................................... 39
Symbols used on the data plate .............................................. 40
Technical data........................................................................ 41
ErP Data .................................................................................. 42
Product che............................................................................ 42

/ 9
OVERVIEW
Advice for the installer
The installation and rst ignition of the
appliance must be performed by qualied
personnel in compliance with current
national regulations regarding installation,
and in conformity with any requirements
established by local authorities and public
health organisations.
This appliance is designed to produce hot water for
domestic use.
It should be connected to a distribution network for
domestic hot water that must be compatible with its
performance and power levels.
The use of the appliance for purposes other than those
specied is strictly forbidden. The manufacturer cannot
be held responsible for any damage caused by improper,
incorrect and unreasonable use of the appliance or by the
failure to comply with the instructions given in this manual.
Installation, maintenance and all other interventions
must be carried out in full conformity with the governing
legal regulations and the instructions provided by the
manufacturer.
Incorrect installation can harm persons, animals and
possessions; the manufacturing company shall not be
held responsible for any damage caused as a result.
The applaince is delivered in a cardboard box. Once you
have removed all the packaging, make sure the appliance
is intact and that no parts are missing. If this is not the
case, please contact your supplier.
Keep all packaging material (clips, plastic bags,
polystyrene foam, etc.) out of reach of children as it may
present a potential hazard.
In the event of a fault and/or malfunction, turn the
appliance off, turn off the gas cock and do not attempt to
repair it yourself. Contact a qualied professional instead.
Before any maintenance or repair work is performed on
the appliance, make sure you have disconnected it from
the electricity supply by switching the external bipolar
switch to the “OFF” position and removing the fuse.
All repairs, which should only be performed using
original spare parts, should be carried out by a qualied
professional. Failure to comply with the above instructions
could compromise the safety of the appliance and
invalidate all liability on the part of the manufacturer.
In the event of any maintenance or other structural work
in the immediate vicinity of the ducts or ue gas exhaust
devices and their accessories, switch the appliance off by
switching the external bipolar switch to the “OFF” position
and shutting off the gas control valve.
When the work has been completed, ask a qualied
technician to check the efciency of the ducting and the
devices.
Turn the appliance off and turn the external switch “OFF”
to clean the exterior parts of the appliance.
WARNING!!
This appliance can be used by children aged
8 years and above and persons with reduced
physical, sensory or mental capabilities or lack
of experience and knowledge if they have been
given supervision or instruction concerning use
of the appliance in a safe way and understand the
hazards involved. Children shall not play with the
appliance. Cleaning and user maintenance shall
not be made by children without supervision.
Clean using a cloth dampened with soapy water. Do not
use aggressive detergents, insecticides or toxic products.
If the appliance is used in full compliance with current
legislation, it will operate in a safe, environmentally-
friendly and cost-efcient manner. If using kits or optional
extras, make sure they are authentic.
WARNING!!
Water with a temperature higher than 50°
cause serious burns.
Always verify water temperature before
use.

10 /
OVERVIEW
Safety regulations
Key to symbols:
Failure to comply with this warning
implies the risk of personal injury, in
some circumstances even fatal
Failure to comply with this warning
implies the risk of damage, in some
circumstances even serious, to
property, plants or animals.
Install the appliance on a solid wall which
is not subject to vibration.
Noisiness during operation.
When drilling holes in the wall for
installation purposes, take care not to
damage any electrical wiring or existing
piping.
Electrocution caused by contact with live
wires. Explosions, res or asphyxiation
caused by gas leaking from damaged piping.
Damage to existing installations.
Flooding caused by water leaking from
damaged piping.
Perform all electrical connections using
wires which have a suitable section.
Fire caused by overheating due to electrical
current passing through undersized
cables.
Protect all connection pipes and
wires in order to prevent them from being
damaged.
Electrocution caused by contact with live
wires. Explosions, res or asphyxiation
caused by gas leaking from damaged
piping.
Flooding caused by water leaking from
damaged piping.
Make sure the installation site and any
systems to which the appliance must be
connected comply with the applicable
norms in force.
Electrocution caused by contact with
live wires which have been installed
incorrectly.
Damage to the appliance caused by
improper operating conditions.
Use suitable manual tools and
equipment (make sure in particular
that the tool is not worn out and that
its handle is xed properly); use them
correctly and make sure they do not
fall from a height. Replace them once
you have nished using them.
Personal injury from the falling
splinters or fragments, inhalation of
dust, shocks, cuts, pricks and abrasions.
Damage to the appliance or
surrounding objects caused by falling
splinters, knocks and incisions.
Make sure any portable ladders are
positioned securely, that they are
suitably strong and that the steps are
intact and not slippery and do not
wobble when someone climbs them.
Ensure someone provides supervision
at all times.
Personal injury caused by falling from
a height or cuts (stepladders shutting
accidentally).
Make sure any rolling ladders are
positioned securely, that they are
suitably strong, that the steps are
intact and not slippery and that the
ladders are tted with handrails on
either side of the ladder and parapets
on the landing.
Personal injury caused by falling from
a height.
During all work carried out at a certain
height (generally with a difference in
height of more than two metres), make
sure that parapets are used to surround
the work area or that individual
harnesses are used to prevent falls. The
space where any accidental fall may
occur should be free from dangerous
obstacles, and any impact upon falling
should be cushioned by semi-rigid or
deformable surfaces.
Personal injury caused by falling from
a height.

/ 11
OVERVIEW
Make sure the workplace has suitable
hygiene and sanitary conditions in
terms of lighting, ventilation and
solidity of the structures.
Personal injury caused by knocks,
stumbling etc.
Protect the appliance and all areas in
the vicinity of the work place using
suitable material.
Damage to the appliance or
surrounding objects caused by falling
splinters, knocks and incisions.
Handle the appliance with suitable
protection and with care.
Damage to the appliance or
surrounding objects from shocks,
knocks, incisions and squashing.
During all work procedures, wear
individual protective clothing and
equipment.
Personal injury caused by
electrocution, falling splinters or
fragments, inhalation of dust, shocks,
cuts, puncture wounds, abrasions, noise
and vibration.
Place all debris and equipment in such
a way as to make movement easy and
safe, avoiding the formation of any
piles which could yield or collapse.
Damage to the appliance or
surrounding objects from shocks,
knocks, incisions and squashing.
All operations inside the appliance
must be performed with the necessary
caution in order to avoid abrupt contact
with sharp parts.
Personal injury caused by cuts,
puncture wounds and abrasions.
Reset all the safety and control
functions affected by any work
performed on the appliance and make
sure they operate correctly before
restarting the appliance.
Explosions, res or asphyxiation
caused by gas leaks or an incorrect
ue gas exhaust.
Damage or shutdown of the appliance
caused by out-of-control operation.
Before handling, empty all components
that may contain hot water, carrying out
any bleeding if necessary.
Personal injury caused by burns.
Descale the components, in
accordance with the instructions
provided on the safety data sheet of
the product used, airing the room,
wearing protective clothing, avoid
mixing different products, and protect
the appliance and surrounding objects.
Personal injury caused by acidic
substances coming into contact with
skin or eyes; inhaling or swallowing
harmful chemical agents.
Damage to the appliance or
surrounding objects due to corrosion
caused by acidic substances.
If you detect a smell of burning or
smoke, keep clear of the appliance,
disconnect it from the electricity
supply, open all windows and
contact the technician.
Personal injury caused by burns,
smoke inhalation, asphyxiation.

12 /
PRODUCT DESCRPTION
Overall view
Legend
1. Overheat thermostat
2. Fan
3. Water outlet temperature probe
4. Water inlet temperature probe
5. Water ow sensor
6. Spark generator
7. Gas valve
8. Gas collector
9. Ignition/Detection electrodes
10. Combustion chamber
11. Heat exchanger
12. Control box
13. Flue connector
1
2
3
5
4
6
7
8
9
10
11
12
13
1
2
3
5
4
7
6
8
9
10
11
12
13

/ 13
PRODUCT DESCRPTION
Overall dimensions
A. Hot water outler 1/2”
B. Gas Inlet 1/2”
C. Cold water inlet 1/2”
G. Drain valve
345
570
Ø100
Ø60 79
129
42
156
187
67
90
187
658
345
138
32
129
93
77
650
616
165
570
71
Ø 60
Ø100
130
180
85
130
180
85
87
58
600
600
616
36
39
46
17
40
A
B
B
AC
A
B
C
A
C
B
G
C
G

14 /
INSTALLATION
Before installing the appliance
The appliance heats water to a temperature below boiling.
It should be connected to a domestic water mains supply.
Before connecting the appliance, it is necessary to
perform the following operations:
- Carefully wash the system piping in order to remove
any screw thread or welding residues, or any dirt which
might prevent the appliances from operating correctly.
- Make sure that the appliance is set up for operation with
the type of gas available (read the information on the
packaging label and on the boiler data plate).
- Make sure that there are no obstacles inside ue
exhaust and that it does not contain any discharge
from other appliances, unless the ue is meant to serve
more than one user (in accordance with current legal
requirements).
- Where there is already a connection to existing ue
exhausts, check that these exhausts have been
perfectly cleaned and are without residues, because
any disconnection could obstruct the passage of fumes
and create potentially dangerous situations.
- Make sure that, where unsuitable ue exhausts are
attached, they have been ducted.
- In areas with particularly hard water, limescale may build
up on the components inside the appliance and reduce
its overall efciency.
C-type appliance, with combustion chambers and air
supply circuits which are completely sealed from the
air outside, do not have any limitations concerning the
ventilation and size of the room in which they are installed.
So that the normal operation of the appliance is not
compromised, the place in which it is installed must be
suitable with regard to the operating limit temperature
value and the appliance should be protected so that it does
not come into direct contact with atmospheric agents.
The appliance must be installed on a solid, non-
combustible, permanent wall to prevent access from the
rear.
When creating a space for the boiler, the minimum
distances (which ensure that various parts of the appliance
may be accessed after it has been installed) should be
respected.
Minimum clearances
In order to allow easy access to the appliance for
maintenance operations.
The appliance must be installed in accordance with the
clearances stated below.
Installation location
Observe the regulations in force, when deciding where to
install the device.
The device must not be installed near heat sources
Do not install the device in environments where
temperatures may reach 0°C
For installation inside furniture, consider that the
maximum temperature of the device jacket is lower
than 85°C and distances required for maintenance
must be respected.
WARNING
No ammable items should be left in the
vicinity of the appliance.
Make sure the installation site and any
systems to which the appliance must be
connected are fully compliant with the
current applicable legislation.
If dust and/or aggressive vapours are
present in the room in which it is to be
installed, the appliance must operate
independently of the air inside the room.
WARNING
The installation and rst ignition of the
appliance must be performed by qualied
personnel in compliance with current
national regulations regarding installation,
and in conformity with any requirements
established by local authorities and public
health organisations.

/ 15
INSTALLATION
Gas connection
The appliance was designed to use gases belonging to
the categories as shown in the following table.
COUNTRY MODEL CATEGORIES
GB NEXT EVO X 11 SFT
NEXT EVO X 16 SFT
I3B/P
II2H3P
Make sure, using the labels on the packaging and the
data plate on the appliance itself, that the appliance is in
the correct country and that the gas category for which
the appliance was designed corresponds to one of the
categories available in the country where it will be used.
The gas supply piping must be created and measured
out in compliance with specic legal requirements and in
accordance with the maximum power of the appliance;
you should also make sure that the shut-off valve is the
right size and that it is connected correctly.
Before carrying out the installation, it is recommended
that the fuel pipes are cleaned thoroughly in order to
remove any residues which could prevent the appliance
from operating correctly.
Check that the supplied gas corresponds to the type of
gas for which the appliance was designed (see the data
plate located on the appliance itself).
It is also important to check that the pressure of the gas
(methane or LPG) you will be using to feed the appliance
is suitable, because if it is insufcient the power of the
generator may be reduced, causing inconvenience for the
user.
Water connection
The illustration shows the connections for the water and
gas attachments of the appliance.
Check that the maximum water mains pressure does not
exceed 8 bar; if it does, a pressure reducing valve must
be installed.
Ensure that the minimum pressure is not lower than
0,2 bar.
View of the hydraulic Connections
A. Hot water outler 1/2”
B. Gas inlet 1/2”
C. Cold water inlet 1/2”
G. Drain valve
A
B
C
A
C
B
G
A
B
C
A
C
B
G
The device is equipped with a lter “G”, located on the
cold water entrance. Periodically clean the hydraulic
system, if dirt is present.
THE GAS WATER HEATER DOES NOT HAVE
PRESSURE RELIEF FUNCTION. AN EXTRA
PRESSURE RELIEF DEVICE IS NEEDED IF THIS
FUNCTION IS NEEDED.
IMPORTANT!
DO NOT ACTIVATE THE DEVICE WITHOUT
THE FILTER.
IMPORTANT!
IF THE UNIT IS INSTALLED IN AREAS
WITH THE PRESENCE OF HARD WATER
(> 200 MG / L) IS NECESSARY TO INSTALL
A WATER SOFTENER TO REDUCE THE
PRECIPITATION OF LIMESTONE IN THE
HEAT EXCHANGER.
THE WARRANTY DOES NOT COVER
DAMAGE CAUSED BY THE LIMESTONE.

16 /
INSTALLATION
Water circuit diagram
ABC
1
2
3
4
5
7
8
10
11
9
6
Key
1. Heat exchanger
2. Detection Electrode
3. Burner
4. Fan
5. Outgoing water temperature sensor
6. Overheat thermostat
7. Cold water inlet lter
8. Inlet water temperature probe
9. Water ow switch
10. Gas valve
11. Ignition electrode
Flue discharge/Air intake duct connections
Intake/discharge ue duct installation must be in
compliance with the regulation in force and instructions
provided by the manufacturer
The appliance is designed to operate in C mode (by
drawing air from outside).
When installing an exhaust system be careful when
handling the seals, in order to avoid ue gas leaking into
the air circuit.
Horizontally-installed piping must have a downward
incline of 3% so as to avoid the build-up of condensate.
When implementing coaxial suction/exhaust systems the
use of authentic accessories is obligatory.
The ue gas exhaust ducting must not be in contact
with or placed near ammable materials, and must not
cross building structures or walls made using ammable
material.
The ue gas exhaust ducting joint should be created using
a male/female coupling and a seal.
Couplings should always be arranged so that they go
against the direction of the condensate ow.
For the calculation method, equivalent length values
and installation examples please refer to the gas ue
accessories catalogue.
The suction/exhaust ducting connection kits are supplied
separately from the appliance, according to different
installation solutions. Carefully read the instructions in
the kit.
If there is any loss of pressure in the piping, please refer
to the gas ue accessories catalogue. Supplementary
resistance must be borne in mind during the sizing
process mentioned above.
WARNING
MAKE SURE THAT THE FLUE GAS EXHAUST
AND VENTILATION DUCTING ARE NOT
OBSTRUCTED.
MAKE SURE THAT THERE ARE NO LEAKS
ALONG THE FLUE GAS EXHAUST DUCTING.
The appliance is set up for connection to a coaxial suction
and ue gas exhaust ducting system (60/100).
The appliance is set up for connection to a 60/100 coaxial
air intake and ue gas exhaust ducting ystem.
For split types of suction and exhaust, using the specied
adapter.

/ 17
INSTALLATION
Table of ue gas exhaust duct lengths
Combustion air intake from outside
C13 Flue gas exhaust and
air suction duct through
external wall in the
same range of pressure
C33 Flue gas exhaust
and air suction duct
from outside with roof
terminal in the same
range of pressure
Type of air suction/ue gas exhaust ducting
S1 = Air intake S2 = Flue gas exhaust
Type
Maximum Extension
Exhaust-air (m) Pipes
diameter
(mm)
NEXT EVO X SFT 11/16
MIN MAX
Coaxial
system
C13
C33
0,6 8 ø 60/100
Twin-pipe
System
C13
C33
S1 = S2
ø 80/80
0,6 = 0,6 8 = 8
WARNING
Before performing any work on the
appliance, rst disconnect it from the
electrical power supply using the external
bipolar switch.
Electrical connections
For increased safety, ask a qualied technician to perform
a thorough check of the electrical system.
The manufacturer is not responsible for any damage
caused by the lack of a suitable earthing system or by the
malfunctioning of the electricity mains supply.
Make sure that the system is able to withstand the
maximum power absorbed by the appliance (this is
indicated on the appliance data plate).
Check that the section of the wires is suitable and is not
less than 0,75 mm2
The appliance must be connected to an efecient earthing
system if it is to operate correctly.
The power supply cable must be connected to a
230V-50Hz network, where the L-N poles and the earth
connection are all respected.
The use of multiplugs, extension leads or adaptors is
strictly prohibited.
It is strictly forbidden to use the piping from the hydraulic,
heating and gas systems for the appliance earthing
connection.
The appliance is not protected against the effects caused
by lightning. If the mains fuses need to be replaced, use
3.15A rapid fuses.
H05VV-F 3G
120
140
Important!
Connection to the electricity mains supply
must be performed using a xed connection
(not with a mobile plug) and a bipolar switch
with a minimum contact opening of 3mm
must be tted.

18 /
INSTALLATION
Electrical diagram
Fan Wentylator
230VAC(50Hz)
Igniter
Flame Detect
Gas Valve Zawór gazu
Gas proportional valve
Gas Separate
Valve_1
Gas Separate
Valve_2
Gas Separate
Valve_33
Water Inlet Temperature Sensor
Water Outlet Temperature Sensor
Water Flux Sensor
Overheat thermostat
ECO

/ 19
COMMISSIONING
Ignition procedure
Press the ON/OFF key placed
on the control panel, to display
the set temperature.
For temperature adjustments
see the User Manual paragraph.
Initial procedures
To guarantee safety and the correct operation of the
appliance, the appliance must be prepared for operation
by a qualied technician who possesses the skills which
are required by law.
Electricity supply
- Check that the voltage and frequency of the electricity
supply correspond to the data shown on the appliance
data plate;
- Make sure that the earthing connection is efcient.
Filling the hydraulic circuit
Proceed in the following manner:
- Gradually open the valve located on the cold inlet;
- open a D.H.W. tap.
WARNING!!
DO NOT USE THE APPLIANCE
WITHOUT WATER.
Gas supply
Proceed in the following manner:
- Make sure that the main gas supply uses the same
type of gas as indicated on the appliance data plate;
- Open all doors and windows;
- Make sure there are no sparks or naked ames in the
room;
- Make sure that the system does not leak fuel using a
cut-off valve inside the appliance itself which should
be closed and then opened while the gas valve is
disabled. The meter must not show any signs of gas
being used for 10 minutes.
First ignition
The rst start-up must be carried out by a
qualied technician.
1. Make sure that:
- The gas valve is closed;
- The electrical connection has been properly carried
out. Make sure that, in any case, the green/yellow
earthing wire is connected to an efcient earthing
system;
- The exhaust duct for combustion products should
be suitable and free from any obstructions;
2. Switch on the appliance (by pressing the ON/OFF
button)
3. Open a D.H.W. tap.
4. The appliance indicates the ignition lock failure
5. Close the D.H.W. tap.
6. To Restore the system, turn the appliance off and on
again.
7. Open the gas valve and check the connection seals,
including the appliance connection seals, making sure
that the meter does not detect any passage of gas.
Eliminate any leaks.
8. Start the appliance by opening a D.H.W. tap.
WARNING!!
Water with a temperature higher than 50°
can cause serious burns.
Always verify water temperature before
use.
WARNING!!
Do not use the appliance without water.

20 /
COMMISSIONING
a
b
Checking the gas settings
Supply pressure check
1. Close the gas valve.
2. Loosen screw “b” and insert the pressure gauge
connection pipe into the pipe tap.
3. Open the gas valve.
4. Switch the appliance ON by opening a DHW tap.
The supply pressure should correspond to the value
established in relation to the type of gas for which the
appliance is designed.
5. Switch the appliance OFF by closing the DHW tap.
6. Close the gas valve.
7. When the check is over, tighten screw “b” and make
sure it is securely in place.
8. Open the gas valve and check the tightness of the
screw.
Checking the maximum and minimum pressure
(see the Gas setting table)
1. Close the gas valve.
2. Loosen screw “a” and insert the manometer
connection pipe into the pipe tap.
3. Open the gas valve.
4. Press the On/Off button the display will illuminate.
5. Open one hot water tap.
Simultaneously press the and (2) buttons for
5 seconds. The display shows26.
6. Press the On/Off, appliance forced to maximum
power. The display shows a number from “00” to “99”.
7. On the manometer verify the pressure and if
necessary press the the and (2) buttons to
adjust maximum burner pressure as indicated on the
gas settings table.
WARNING!!
Should the power pressure not
correspond to what is indicated on the
Gas Summary Table, DO NOT ACTIVATE
THE DEVICE.
Checking slow ignition power
(see the Gas setting table)
1. Close the gas valve.
2. Loosen screw “a” and insert the manometer
connection pipe into the pipe tap.
3. Open the gas valve.
4. Press the On/Off button the display will illuminate.
5. Disconnect and reconnect the power supply.
6. Press simultaneously press the or (2) buttons
for 3 seconds. The display showsL6, ppliance
forced to ignition power. Open one hot water tap.
7. On the manometer verify the pressure and if
necessary press the or (2) buttons to adjust
the slow ignition pressure as indicated on the gas
settings table.
8. Press the ON/FF button to save the change.
9. Close Hot water tap. Switch off the appliance through
ON/OFF button.
10. Close Hot water tap. Switch off the appliance through
ON/OFF button.
11. Tighten the connector screw tightly and check for
leaks using a suitable device
8. Press the On/Off, appliance forced to minimum
power. The display shows a number from “00” to “99”.
9. On the manometer verify the pressure and if
necessary press the the and (2) buttons to
adjust minimum burner pressure as indicated on the
gas settings table.
10. Press the On/Off button to conrm.
11. Close Hot water tap. Switch off the appliance through
ON/OFF button.
12. Tighten the connector screw tightly and check for
leaks using a suitable device