Ariston CLAS NET One User manual

HOT WATER I HEATING I RENEWABLES
USER’S MANUAL
CONDENSING WALL-HUNG GAS BOILER
CLAS NET One
CLAS One
CLAS SYSTEM One
CLAS NET One
CLAS One
CLAS SYSTEM One
discover more
@ariston.com
G.C.N.: 47-116-88 (24 kW)
G.C.N.: 47-116-89 (30 kW)
G.C.N.: 47-116-90 (38 kW)
G.C.N.: 47-116-85 (24 kW)
G.C.N.: 47-116-86 (30 kW)
G.C.N.: 47-116-87 (38 kW)
G.C.N.: 41-116-49 (18 kW)
G.C.N.: 41-116-50 (24 kW)
G.C.N.: 41-116-51 (30 kW)
Country of Destination: GB/IE
Including
Cube S Net

2/
USER’S MANUAL
Disposal and recycling boiler.
Our products are designed and manufactured by using
components made from recyclable materials where
possible.
The boiler and its accessories have to be adequately
disposed of and the various materials separated where
possible.
The packaging used for the transport of the boiler must be
disposed of by the installer.
ATTENTION!!
Recycling and disposal of the boiler and the accessories
must be made as required by regulations.
Dear Customer,
Thank you for choosing an ARISTON boiler.
We warranty that your boiler 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.
Thank you for choosing an Ariston
boiler compatible with Ariston
Net, the service designed and
manufactured by Ariston, to
provide a whole new experience in
using a domestic heating system.
Ariston Net allows you to start,
stop and check the temperature
of domestic heating and water
anytime, anywhere from a smartphone, tablet or PC. It
allows you to constantly monitor energy consumption to
ensure you save on your gas bill. It also noties you in
real time if there is a boiler failure. If a remote diagnostic
service is activated, the service centre will be able to
solve problems remotely where possible or arrange an
appointment at your earliest convenience.
* The installation must have been carried out by a Gas
Safe Registered engineer.
For more information call us on 0333 240 8777.
WARRANTY
This appliance is in warranty for 8 years (CLAS ONE
Models) - 12 years (CLAS NET ONE Models) from
the date of installation. Proof of installation or purchase
and annual servicing must be provided upon request. The
installation must have been carried out by a Gas Safe
Registered engineer.
Ariston is obliged under this warranty to repair or replace a
faulty appliance under our terms and conditions.
Any repair or replacement will be at Ariston’s discretion.
This warranty will only apply where the fault arises from
defects in the appliance, caused either by material or
workmanship of the manufacturer.
This warranty does not cover malfunction or damage
arising from incorrect installation, commissioning or
maintenance procedures as advised in the Installation and
Servicing manual, inefficient flue system, poor or incorrect
electricity and wiring, incorrect gas supply or pressure,
tampering by inexperienced persons and any other cause
not directly related to manufacture.
Ariston Thermo Uk Ltd cannot accept responsibility for any
cost arising from repair or maintenance carried out by any
third party.
This warranty does not affect your statutory rights.
The appliance must be registered with Ariston within 30
days from date of installation.
The boiler must be serviced annually either by a local Gas
Safe Registered engineer or managed by Ariston directly
which can be arranged by calling 0333 240 8777.
If the boiler is not serviced directly through Ariston then
proof service must be sent in to Ariston UK (address on
back cover of manual).”
Registration is online at www.ariston.co.uk.

/ 3
USER’S MANUAL
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 o
the appliance as a result of vibrations.
Damage to the appliance or items underneath
it caused by the object falling o 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).


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.
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 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.

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

open all windows and call for assistance.
Personal injury caused by burns, smoke
inhalation, intoxication.

gas valve, open all windows and call for
assistance.
Explosions, res or intoxication.
This appliance can be used by children aged
from 8 years and above and person with
reducedphysical,sensoryormentalcapabilities
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.

4/
USER’S MANUAL
The installation and rst ignition of the
boiler must be performed by qualied Gas
Safe Registered engineer in compliance with
Gas Safety (instillation & use) regulations
and all other national regulations regarding
installation, and in conformity with any
requirements established by local authorities
and public health organisations.
After the boiler has been installed, the installer
must ensure that the end user receives the
declaration of conformity and the operating
manual, and should provide all necessary
information as to how the boiler and the safety
devices should be handled.
This appliance is designed to produce hot water for domestic
use (combi version).
It should be connected to a heating system and a distribution
network for domestic hot water, both of which 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 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 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 boiler 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 boiler and system pipe work should be drained in
order to prevent frost damage.
Turn the boiler off and turn the external switch “OFF” to clean
the exterior parts of the appliance.
Do not allow children or inexperienced persons to use the
appliance without supervision.
CE labelling
The CE mark guarantees that the appliance conforms to the
following directives:
- 2009/142/CEE
relating to gas appliances
- 2014/30/EU
relating to electromagnetic compatibility
- 92/42/CEE
relating to energy efciency
- 2014/35/EU
relating to electrical safety
- 2009/125/CE
Energy related Products
- 813/2013
Commission regulation (EU)
Do not forget the Log Book!
The Benchmark Scheme
Benchmark places responsibilities on both
manufacturers and installers.
The purpose is to ensure that customers are
provided with the correct equipment for their
needs, that it is installed, commissioned and
serviced in accordance with the manufacturer’s
instructions by competent persons and that it
meets the requirements of the appropriate Building
Regulations.
The Benchmark Checklist can be used to
demonstrate compliance with Building Regulations
and should be provided to the customer for future
reference.
Installers are required to carry out installation,
commissioning and servicing work in accordance
with the Benchmark Code of Practice which is
available from the Heating and Hotwater Industry
Council who manage and promote the Scheme.
Visit www.centralheating.co.uk for more
information.

/ 5
USER’S MANUAL
CONTROL PANEL
Legend:
1. Display
2. Domestic Hot Water adjustment button +/- (a)
3. MODE button
(Operation mode selection summer/winter)
4. COMFORT button
5. ON/OFF button
6. Auto button (To activate Thermoregulation)
7. RESET button
8 Heating temperature adjustument button +/- (b)
9. Time clock
10. Pressure gauge
21 39 104 5 6 7 8
Legend:
Digits indicating:
- boiler status
- temperature indication with
bar level
- error code signals
(ERROR)
- Request press RESET
button
 (boiler block)
- menu settings
Technical assistance request
Flame detected with
indication of power used
Heating operation set
Heating operation active
Hot water operation set
Hot water operation active
Hot Water Comfort activated
Boiler off with antifreeze
function active
Anti-frost Function Active
AUTO AUTO function activated
High efciency operation (low
C.H. ow temperature)
Solar temperature probe
connected - optional
Error signals
The display shows the code
External temperature
displayed
(with external sensor optional)
Wi-Fi active
(Kit Optional - CLAS ONE)

6/
USER’S MANUAL
Initial operating procedures
Check the water pressure on the pressure gauge and make sure
that the gure is between 0.6 and1.5 bar when the system is cold.
If the pressure is just under the minimum value the display will
request a lling procedure - see note below.
Operating mode selection
Use the MODE button 3 to select the desired operating mode.
Operating mode Display
heating + hot water production for domestic use -
WINTER
hot water production for domestic use only -
SUMMER
ONLY HEATING
CLAS SYSTEM ONE
The ignition of the burner is indicated on the display by the
symbol
the dashes underneath indicate the power
utilised.
Re-establish the correct pressure by lling loop.
If the pressure drops very frequently, there may be a water leak
at some point in the system. If this is the case a plumber should
be contacted.
Adjusting the heating
It is possible to set the temperature of the heating water by
pressing the buttons 8.
The temperature that may be obtained.which varies from 20°C
to 45°C (low temperature) and 35°C to 82°C (high temperature).
FILLING PROCEDURE



 PURGE 




Ignition procedure
Press the ON/OFF button on the control panel to switch on the
boiler
Note: Connections viewed from behind boiler
Note: Connections viewed from behind boiler
CLAS ONE / CLAS NET ONE
1. To repressurise the system ensure exible hose 3 is
connected
2. Slowly open taps 1 & 2 (see diagrams above)
3. Water will be heard entering the system
4. When the pressure gauge reads 1.5 bar close taps 1 & 2
1
1
2
2
3
3
Note.
Connections viewed from
behind boiler.
Note.
Connections viewed from
behind boiler.
CLAS SYSTEM ONE
The display shows :
- the operating mode:
- the set temperature in central heating mode
- the set temperature of the hot water in domestic hot water

/ 7
USER’S MANUAL

To switch o the boiler press the ON/OFF button, the display will
switch o.
The Anti-Frost Function remains active.
Domestic hot water temperature adjustement
only for CLAS ONE / CLAS NET ONE MODELS
It is possible to set the temperature of the domestic hot water
by pressing the buttons 2a temperature may be obtained which
varies from 36°C to 60°C.The value set previously will ash on
the display.

To switch o the heating, press the MODE button 3; the heating
operation symbol will disappear from the display. The Mode
button can be used to keep the domestic hot water production
process active or to place it in standby (modes deactivated).
In the gure below the boiler remains active only for the
production of domestic hot water, indicating the set temperature.
ATTENTION!!
Switch o the boiler completely by switching the external elec-
trical switch to the OFF position. Shut o the gas valve.
Clock Instructions
1. General layout
The mechanical clock covers a 24 hour period. Each tappet
represents 15 minutes A. An override switch is located on the
clock B.
2. To set the time
To set the time of day, grasp the outer edge of the dial and turn
slowly clockwise until the correct time is lined up with the arrow
C.
3. To Set the “On” and “Off” times
The clock uses a 24hours system. e.g. 8 = 8.00 am and 18 =
6.00 pm “ON” periods are set by sliding all tappets between
the “ON” time and the “OFF” time to the outer edge of the dial.
The tappets remaining at the centre of the dial are the “OFF”
periods.
4. For operation
Put the selector switch Bto the symbol to control the
central heating by the clock. Put the switch Bto “I” to select
permanent operation or to “0” to turn the central heating off
permanently.
6
9
12
3
A
CB

8/
USER’S MANUAL

The boiler allows the ‘comfort’ level for the output of domestic
hot water to be increased through the “COMFORT” function. This
function keeps the secondary exchanger (or an external tank)
warm during the periods in which the boiler is inactive, thereby
bringing the initial thermal condition of the water drawn to a
higher temperature.
This function may be enabled by pressing the COMFORT button 4.
When the function is enabled the text COMFORT appears on the
display..
Auto button - Temperature adjustment activation
The AUTO function enables boiler operation to be adapted to
environmental conditions and to the type of system it is installed
on.
Comfortable temperature is reached inside the room in the
quickest way possible, without wasting money, energy or
eciency, while substantially reducing the amount of wear
experienced by the components.
Your installer will advise you on the devices connectable
to the boiler and will program it according to the system.
In normal boilers the water temperature inside the heating
elements is usually set to a high value (70-80°C), thereby ensuring
eective heating during the few really cold winter days. It then
becomes excessive on less cold days (of which there are many)
more typical of the autumn and winter seasons. This leads to
excessive room heating after the thermostat has been switched
o, resulting in energy waste and uncomfortable conditions
inside the room.
The AUTO function “takes control” of the boiler and selects
the best operating regime based on environmental conditions,
external devices connected to the boiler and the performance
required. It constantly decides at which power level to
operate based on the environmental conditions and the room
temperature required.

/ 9
USER’S MANUAL

The boiler is protected from malfunctions by means of internal
checks performed by the electronic P.C.B., which stops the boiler
from operating if necessary. In the event of the boiler being shut
o in this manner, a code appears on the control panel display
which refers to the type of shut-o and the reason behind it.
Two types of shut-o may occur:

This type of error is “volatile”, which means
that the boiler starts up again automatically
as soon as the problem which caused the
shut-o is removed; and the error
code (e.g. / ) ash on the
display and the symbol appears.
In fact, soon as the cause of the shut-o
disappears, the boiler starts up again and
continues to operate normally.
If the boiler still indicates a safety shut-o,
switch it o. Make sure the external electric
switch is in the OFF position, shut o the gas valve and contact a
qualied technician.

If the water pressure inside the heating circuit is insucient, the
boiler will perform a safety shut-o.
Code 108 ( / ) will appear on
the display.
The system may be restarted, re-balancing
the water pressure, by using the lling
procedure - see note 1.
If the re-balancing request is performed
on a frequent basis, switch the boiler o,
bring the external electric switch to the OFF
position, shut o the gas valve and contact
a qualied technician to check for any leaks
of water.
Important
If this shutdown occurs frequently, contact an authorised
service centre for assistance. For safety reasons, the boiler
will allow a maximum of 5 reset operations to take place in 15
minutes (individual presses of the button).
If the shutdown is occasional or an isolated event, this is not
Necessarily a problem.
Anti-frost Device.
The anti-frost function acts on the central heating ow temperature pro-
be, independently from other settings, when the electrical supply is tur-
ned on. If the primary circuit temperature falls below 8°C the pump will
run for 2 minutes.
After the two minutes of circulation (xed) the boiler will check the fol-
lowing:
a - if the central heating ow temperature is > 8°C, the pump stops;
b - if the central heating ow temperature is between 4 and 8°C, the
pump will run for another two minutes;
c - if the central heating ow temperature is
< 4°C, the burner will re (heating posi-
tion) at minimum power until the tempe-
rature reaches 33°C, the burner will go o
and the pump will continue to run for two
minutes.
The activation of the Anti-Frost feature is
symbolised by .
The anti-frost device activates only when (with
the boiler operating correctly):
- the system pressure is correct;
- the boiler is electrically powered;
- there is a supply of gas.
Operation shutdown error table
Display Description
1 01 Overheating
1 03
Insucient circulation
1 04
1 05
1 06
1 07
1 08 Insucient water pressure - see Note 1
3 05 P.C.B. error
3 06 P.C.B. error
3 07 P.C.B. error
5 01 No ame detection




PURGE




Operation shutdown
This type of error is “non-volatile”, which means that it is not
removed automatically.
On the display ash and the error code
, e.g. Err/501
and appears the symbol .
In this case the boiler does not restart automatically, but it may be
reset by pressing the button.
If the problem manifests itself again after several attempts to
reset the appliance, contact a qualied technician.

10 /
USER’S MANUAL
Change of gas type
Our boilers are designed to function either with Natural Gas
(Methane, G20) or LPG (Propane, G31).
If you need to change from one gas to another then you should
speak to a Gas Safe Registered engineer or please call Ariston
on 0333 240 8777.

Schedule an annual service for the boiler with a Gas Safe
Registered engineer.
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 warranty of the appliance.

8 or 12 Year Warranty
Terms & Conditions
WHAT ARISTON REQUIRES
· The boiler must be registered with Ariston within 30 days from date of installation. Registration is on line
at www.ariston.co.uk
· The boiler must be installed in accordance with the manufacturers instructions
· The boiler must be installed by a Gas Safe Registered engineer.
· The installer must arrange for a Building Regulations Compliance Certicate to be issued to the boiler
owner.
· The Building Regulations Compliance Certicate is to be made available upon request by any attending
Ariston service representative.
· The Benchmark commissioning checklist, which can be found at the back of the Installation instructions,
must be completed in full by the installer.
· The completed Benchmark checklist must be left with the boiler or be made available upon request by
any attending Ariston representative.
· The boiler must be serviced by the 12 month anniversary of the installation. This must be carried out by a
Gas Safe Registered engineer.
· Proof of annual service must be made available upon request by any attending Ariston representative.
· The boiler must be installed on a clean system and corrosion inhibitors added. Fitting a magnetic lter is
suggested.
All of the above are standard procedures which a competent installer will be aware of.
Failure to comply with any of the above will result in any warranty being withdrawn.
CONDITIONS OF THE 8 or 12 YEAR WARRANTY
• Ariston must be contacted immediately following any malfunction. Access must be granted for an Ariston
approved engineer to inspect the appliance and it’s installation. We are unable to cover any costs under
warranty where Ariston have not been contacted and allowed access to inspect the appliance and
installation. Removal or repair of the appliance by any other party than Ariston without prior inspection or
authorisation will void this warranty.
• The 8 or 12 Year warranty is only applicable to appliances installed in the United Kingdom.
• The following is not covered under the warranty:
- Any external boiler controls (other than those supplied by Ariston), pipework and radiators
- Loss or damage caused by using the boiler in a non-domestic or commercial environment.
- Loss or damage caused by accident, theft, attempted theft, malicious damage or damage caused by
re or explosion.
- Damage caused by any disaster affecting the equipment including neglect without limitation.
- Clearing airlocks and partially or fully blocked pipes or work caused by equipment, which has not
installed correctly.
- Dirty systems/dirt particles degradation of the boiler from other parts of the system.
- Claims arising from any problem with the supply of electricity, gas or water.
- Consequential loss or damage arising directly or indirectly caused by the boiler not working. Cosmetic
damage.
- Costs arising from difculties in getting to the boiler. This includes: pipe work under oor boards or pipe
work contained in the fabric of the building. Ariston requires the warranty holder to carry out whatever
works are necessary to enable Ariston staff or nominated representatives to gain access the boiler
prior to arrival.
- Any water pressure adjustments on sealed systems, Claims arising from scale damage.
- Any modication, alteration to the boiler carried out without permission or authority from Ariston.

ITALIAN DESIGN
Ariston Thermo UK Ltd
Artisan Building
Hillbottom Road
High Wycombe
Bucks HP124HJ
Telephone: [phone]
Customer Service: 0333 240 8777
ariston.co.uk
420010818400