Ariston CLAS HE R 24 User guide

CONDENSING WALL-HUNG GAS BOILER
Country of Destination: GB/IE
HOT WATER I HEATING I RENEWABLE IAIR CONDITIONING
INSTALLATION AND SERVICING INSTRUCTIONS
CLAS ONE R 24
G.C.N.: 41-116-52 (24 kW)

INDEX
Overview.......................................................................................................3
General Information...................................................................................4
Advice for the Installer...............................................................................4
CE Labelling...................................................................................................4
Data Plate Symbols.....................................................................................4
Safety Regulations ......................................................................................5
Product description.................................................................................7
Control Panel.................................................................................................7
Overall View...................................................................................................8
Overall Dimension ......................................................................................8
Minimum Clearances .................................................................................8
Installation...................................................................................................9
Reference Standards ..................................................................................9
Installing the Boiler.................................................................................. 13
Gas Connection......................................................................................... 13
Central Heating connection ................................................................. 14
Instructions for Opening the Casing and Performing an
Internal Inspection.............................................................................. 14
Water circuit diagram.............................................................................. 15
Connecting the Flue................................................................................ 16
Fitting the Coaxial Flue (Ø 60/100 Horizontal)............................... 17
Fitting the 5”Flue (Ø 80/125 Horizontal / Vertical)....................... 18
Fitting the Coaxial Flue (Ø 60/100 Vertical)..................................... 19
Fitting the Twin Pipe (Ø 80/80)............................................................ 20
Electrical Connections............................................................................ 23
Electrical connection unit ..................................................................... 23
Electrical Diagram .................................................................................... 24
Commissioning ....................................................................................... 27
Initial Preparation..................................................................................... 27
Electricity Supply...................................................................................... 27
Filling the Heating System.................................................................... 27
Gas Supply .................................................................................................. 27
Water Treatment ....................................................................................... 27
First Igniton Operation........................................................................... 28
Ignition procedure................................................................................... 29
First Ignition ............................................................................................... 29
Combustion checking procedure....................................................... 30
AUTO Function .......................................................................................... 33
Boiler Protection Devices................................................................... 34
Boiler Protection Devices ...................................................................... 34
Anti-Frost Device...................................................................................... 34
Table summarising error codes........................................................... 34
Settings - Adjustment - Problem Identification Menus
Accessing the Menus .............................................................................. 35
Maintenance
General Comments.................................................................................. 42
Operational Test........................................................................................ 42
Draining procedures ............................................................................... 42
Cleaning the primary exchanger........................................................ 42
Cleaning the trap...................................................................................... 42
Maintenance Guide
1. General Access...................................................................................... 43
2. Electrical Unit ........................................................................................ 43
3. Hydraulic Unit ....................................................................................... 46
4. Burner Unit............................................................................................. 50
5. Annual Maintenance .......................................................................... 54
Technical Information
Technical Data ........................................................................................... 55
ERP Data....................................................................................................... 56
Product fiche.............................................................................................. 56
Package Label - Instuctions to filling ................................................ 57
Package fiche............................................................................................. 59
Benchmark Commissioning Checklist ............................................ 61
Benchmark Service Interval Record................................................. 62

/ 3
OVERVIEW
These instructions are suitable for CLAS ONE R boilers :
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 England & Wales. The Benchmark Checklist can be used to demonstrate compliance with
Building Regulations England & Wales 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.
To The Installer
As part of the commissioning of this appliance it is vital that the Log Book is completed and given to the Householder. Please
ensure that your customer is aware of the importance of keeping the Log Book safe as a record of the installation and the
appliance service history.
Please ensure that your customer is aware of the correct operation of the system, boiler and controls.
MTS recommend the use of protective clothing, when installing and working on the appliance i.e. gloves..
CUSTOMER CARE
ARISTON, as a leading manufacturer of domestic and commercial water heating appliances is committed to providing high
quality products and a high quality after sales service.
Advice on installation or servicing can also be obtained by contacting the ARISTON Technical and Customer Service
Departments at High Wycombe.
TECHNICAL DEPARTMENT CUSTOMER SERVICE DEPARTMENT
Tel: [phone] Tel: [phone]
Fax: [phone] Fax: [phone]
GUARANTEE
The manufacturer’s guarantee is for 8 years from the date of purchase. The guarantee is invalidated if the appliance is not
installed in accordance with the recommendations made herein or in a manner not approved by the manufacturer. To assist
us in providing you with an efficient after sales service, please register the guarantee online at www.ariston.co.uk
CAUTION
In the United Kingdom, installation, start-up, adjustments and maintenance, must be performed by a competent person only,
in accordance with the current Gas Safety (Installation & Use) Regulations and the instructions provided.
In the Republic of Ireland, the installation and initial start up of the appliance must be carried out by a Competent Person in
accordance with the current edition of I.S.813“Domestic Gas Installations”, the current Buidling Regulations, reference should
also be made to the current ETCI rules for electrical installation.
All GAS SAFE registered installers carry a GAS SAFE ID card, and have a registration number. Both should be recorded
in your boiler Log Book. You can check your installer is GAS SAFE registered by calling GAS SAFE directly on:- 0800
408 5500.
Improper installation may cause damage or injury to individuals, animals and personal property for which the manufacturer
will not be held liable. To ensure efficient and safe operation it is recommended that the boiler is serviced annually by a
competent person.
If it is known that a fault exists on the appliance, it must not be used until the fault has been corrected by a competent person.
This instruction booklet is especially designed for appliances installed in the UK and the Republic of Ireland

4/
OVERVIEW
CE labelling
The CE mark guarantees that the appliance conforms to the
following directives:
- 2009/142/CEE
relating to gas appliances
- 2004/108/CEE
relating to electromagnetic compatibility
- 92/42/CEE
relating to energy efficiency
- 2006/95/CEE
relating to electrical safety
- 2009/125/CE
Energy related Products
- 813/2013
Commission regulation (EU)
Advice for the installer
These appliance are designed for use on open vented central heating
systems. These appliances are designed for domestic use only.
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 specified 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 boiler is delivered in a carton. 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 qualified professional instead.
Before any maintenance or repair work is performed on the boiler,
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 qualified 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 flue or flue 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, a qualified technician
must check the efficiency of the flue and the devices.
Turn the boiler off and turn the external switch “OFF” to clean the
exterior parts of the appliance.
Clean using a cloth dampened with soapy water. Do not use
aggressive detergents, insecticides or toxic products. If the appliance
Symbols used on the data plate
MIN
Q
MAX
P
60/80°C
1
2
5
4
3
3
6
7
19
8
9
10 11
12
14
15
16 17 18
13
20
21
22
1
Legend :
1. Brand
2. Manufacturer
3. Boiler model - Serial number
4. Commercial reference
5. certification number
6. Destination country - gas category
7. Gas setting
8. Installation type
9. Electrical data
10. Maximum domestic hot water pressure
11. Maximum heating pressure
12. Boiler type
13. NOx class / Efficiency
14. Input rating nominal heating
15. Power ouput heating
16. DHW specific flow rate
17. Boiler output efficiency
18. Input rating nominal DHW
19. Gases which may be used
20. Minimum ambient temperature for use
21. Max. central heating temperature
22. Max. domestic hot water temperature
ATTENTION!!
THE INSTALLATION AND FIRST
IGNITION OF THE BOILER MUST BE
PERFORMED BY QUALIFIED PERSONNEL
IN COMPLIANCE WITH CURRENT
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.
is used in full compliance with current legislation, it will operate in a
safe, environmentally-friendly and cost-efficient manner.
If using kits or optional extras, make sure they are authentic.

/ 5
OVERVIEW
Install the appliance on a solid wall which is not
subject to vibration.
Noisy 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, fires 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, fires 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 fixed properly); use them
correctly and make sure they do not fall from a
height. Replace them once you have finished 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.
Use electrical equipment suitable for its intended
use (in particular, make sure that the power
supply cable and plug are intact and that the parts
featuring rotary or reciprocating motions are
fastened correctly); use this equipment correctly;
do not obstruct passageways with the power
supply cable, make sure no equipment could fall
from a height. Disconnect it and replace it safely
after use.
Personal injury caused by falling splinters or
fragments, inhalation of dust, knocks, cuts,
puncture wounds, abrasions, noise and vibration.
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 fitted 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.
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.
SAFETY REGULATION
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.

6/
OVERVIEW
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, fires or asphyxiation caused by gas
leaks or an incorrect flue 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.
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.

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PRODUCT DESCRIPTION
CONTROL PANEL
Legend:
1. Display
2. Domestic Hot Water adjustment button +/-
NOT ACTIVE (a)
3. MODE button
(Operation mode selection summer/winter)
4. COMFORT button NOT ACTIVE
5. ON/OFF button
6. Auto button (To activate Thermoregulation)
7. RESET button
8 Heating temperature adjustument button +/- (b)
21 3 4 5 6 7 8
(a) Pressing the buttons simultaneously allows
access to the engineers menu and all
parameters and settings
(b) Use these buttons to modify and save the
parameter settings
DISPLAY
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 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 -
option
Error signals
The display shows the code
External temperature displayed
(with external sensor optional)
Wi-Fi active (Kit Optional)

8/
PRODUCT DESCRIPTION
Overall view
1. Central heating return
2. Central heating flow
3. C.H. Flow temperature probe
4. Burner
5. Detection electrode
6. Silencer
7. Gas valve
8. Trap
9. Gas tap
10. Display box
11. Electrical box
12. Main P.C.B.
13. Modulating fan
14. Combustion analysis test point
15. Flue connector
16. C.H. Return temperature probe
Overall Dimensions Minimum clearances
In order to allow easy access to the boiler for maintenance
operations, The boiler must be installed in accordance with the
clearances stated below.
120 120
135
200 200
595
664
52
122
161
25
450
300 250
50 50
1
2
3
8
4
5
6
7
9
11
12
13
14
15
10
16

/ 9
INSTALLATION
Reference Standards
In the United Kingdom, the installation and initial start-up of the
boiler must be by a Gas Safe registered installer in accordance with
the installation standards currently in effect, as well as with any and
all local health and safety standards i.e. Gas Safe.
In the Republic of Ireland the installation and initial start-up of the
appliance must be carried out by a Competent Person in accordance
with the current edition of I.S.813 “Domestic Gas Installations” and
the current Building Regulations, reference should also be made to
the current ETCI rules for electrical installation.
The installation of this appliance must be in accordance with
the relevant requirements of the Local Building Regulations, the
current I.E.E. Wiring Regulations, the by-laws of the local authority,
in Scotland, in accordance with the Building Standards (Scotland)
Regulation and Health and Safety document No. 635, “Electricity
at Work Regulations 1989” and in the Republic of Ireland with the
current edition of I.S. 813 and the Local Building Regulations (IE).
C.O.S.H.H.
Materials used in the manufacture of this appliance are non-
hazardous and no special precautions are required when servicing.
Codes of Practive
Installation should also comply with the following British Standards
Code of Practice:
BS 7593: Treatment of water in domestic hot water
central heating systems
BS 5546: Installation of hot water supplies for
domestic purposes
BS 5440-1: Flues
BS 5440-2: Air supply
BS EN 12831 - BS EN 14336:
Forced circulation hot water systems
BS 6798: Installation of gas fired hot water boilers
of rated input not exceeding 70kW
BS 6891: Installation of low pressure gas pipes up to 28mm
BS 7671: IEE Wiring Regulations
BS 4814: Specification for expansion vessels
BS 5482: Installation of L.P.G.
Technical Bulletin TB143 Flue Gas Analysis
and in the Republic of Ireland in accordancce with the following
codes of practice:
I.S. 813 Domestic Gas Installations
Avoid installing the boiler where the air inlet can be polluted
by chemical products such as chlorine (swimming pool area), or
ammonia (hair dresser), or alkalin products (launderette).
Flue
Detailed information on flue assembly can be found in the
“Connecting the Flue” section.
The boiler must be installed so that the flue terminal is exposed to the
free passage of external air at all times and must not be installed in
a place likely to cause nuisance. It must not be allowed to discharge
into another room or space such as an outhouse or closed lean-to.
Condensing boilers have a tendency to form a plume of water
vapour from the flue terminal due to the low temperature of
the flue gasses. The terminal should therefore be located with
due regard for the damage or discolouration that may occur to
building within the vicinity and consideration must also be given to
adjacent boundaries, openable windows should also be taken into
consideration when siting the flue.
The minimum acceptable clearances are shown below:
- A Directly below an opening, window, etc 300 mm
- B Horizontally to an opening, window, etc 300 mm
- C Below gutters, soils pipes or drain pipes 75 mm
- D Below eaves 200 mm
- E From vertical drain pipe or soil pipe 75 mm
- F From internal or external corner 300 mm
- G Above ground, roof or balcony level 300 mm
- H From a surface facing the terminal 600 mm
- I From a terminal facing a terminal 1200 mm
- J Vertically from a terminal on the same wall 1500 mm
- K Horizontally from an terminal on the same wall 300 mm
- L Fixed by vertical flue terminal
Note: the flue must Not be iNstalled iN aplace likely to cause aNuisaNce
aNd positioNed to eNsure that products of combustioN do Not discharge
across abouNdary
It may be necessary to protect the terminal with a guard, if this is the
case it will be necessary to purchase a stainless steel terminal guard.
Reference should be made to the Building Regulations for guidance.
Ventilation
The room in which the boiler is installed does not require specific
ventilation. If the boiler is installed in a cupboard or compartment
ventilation is not required for cooling purposes.

10 /
INSTALLATION
Gas Supply
The gas installation and tightness testing must be in accordance
with the requirements of BS6891. Ensure that the pipe size is
adequate for demand including other gas appliances on the same
supply.
Electrical Supply
The appliance requires an earthed 230V - 50 Hz supply and must
be in accordance with current I.E.E. regulations. It must also be
possible to be able to completely isolate the appliance electrically.
Connection should be via a 3 amp double pole fused isolating
switch with contact separation of at least 3mm on both poles.
Alternatively, a fused 3 amp, 3 pin plug and unswitched socket
may be used, provided it is not used in a room containing a bath or
shower, it. It should only supply the appliance.
Automatic by pass
Ariston recommend that an automatic by pass is installed a minimum
of 1.5 metres away from the boiler to ensure the minimum required
flow rate is achieved at all times. Additionally the design of the
system and its controls must ensure that an adequate temperature
diff erential is met, and should be such to prevent boiler cycling.
Feed and vent pipework
The feed and vent pipework from the boiler to the F & E (Feed &
Expansion) tank should be configured as shown in the fig. below.
Heating Circuit
Boiler
15mm (Min.)
Automatic By-Pass
Pump
2M
Minimum
150mm
Max.
500mm Minimum
Height
22mm (Min.) Vent Pipe
15mm (Min.) Cold Feed
Cylinder
RF
Return
Flow
Return
Flow
Note:
• The distance between the cold feed and the open vent pipe shall
be no more than 150mm.
• The cold feed must be inverted as shown.
• The open vent pipe must be a minimum of 22mm diameter.
• The cold feed pipe must be a minimum of 15mm diameter.
• The cold feed and open vent pipes must rise continuously and be
unrestricted.
• The minimum distance from the top of the boiler to the bottom
of the F & E tank shall be no less than 2m. Whilst the maximum
distance shall be not more than 27m.
• The distance between the bottom of the F & E tank and the
highest point of the open vent must be no less than 500mm.
• The flow and return pipes from the boiler must rise continuously
and be unrestricted.
• The supply of water to the F & E tank should be taken from the
mains water supply via a suitable float operated valve. While the
supply from the F & E tank to the boiler/heating circuit (via the
cold feed) shall be unrestricted.
• The F & E tank must be adequately supported and installed in
accordance with relevant Building Regulations.
Pump specification
The pump should be fitted on the flow pipe from the boiler and have
isolating valves each side. A variable duty pump should be set to
give a temperature differential of no greater than 20ºC.
Draining tap
A draining tap must be provided at all the lowest points of the
system which will allow the entire system to be drained. A drain tap
must also be installed on the flow and return pipes immediately
above the boiler to ensure complete draining of the primary flow
and return is possible.
Drain taps shall be to the current standard of BS 2879.
Pressure Loss Graphs through the boilers
mWH
l/h
0100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
12-18 kW
12 kW
18 kW
821 l/h = 20 Δ @ 19.1 kW
555 l/h = 20 Δ @ 12.9 kW
1.3 mWH
2.65 mWH
24 kW
1118 l/h = 20 Δ @ 26.0 kW
3.7 mWH

/ 11
INSTALLATION
Flushing and Water Treatment
The boiler is equipped with a stainless steel heat exchanger.
The detailed recommendations for water treatment are given in BS
7593:2006 (Treatment of water in domestic hot water central heating
systems); the following notes are given for general guidance.
If the boiler is installed on an existing system, any unsuitable
additives must be removed.
Under no circumstances should the boiler be fired before the system
has been thoroughly flushed; the flushing procedure must be in line
with BS 7593:2006.
We highly recommend the use of a flushing detergent appropriate
for the metals used in the circuit. These include cleansers produced
by Fernox BetzDearbon, whose function is to disolve any foreign
matter that may be in the system.
In hard water areas or where large quantities of water are in the
system the treatment of water to prevent premature scaling of the
main exchanger is necessary.
The formation of scale heat compromises the efficiency of the
thermic exchanger because small areas of scale cause a high
increase of the temperature of the metallic walls and therefore add
to the thermal stress of the heat exchanger.
Demineralised water is more aggressive so in this situation it is
necessary to treat the water with an appropriate corrosion inhibitor.
Any treatment of water by additives in the system for frost protection
or for corrosion inhibition has to be absolutely suitable for all metals
used in the circuit.
The use of a corrosion inhibitor in the sysem such as Fernox MB-
1, BetzDearborn Sentinel X100 or Fernox System Inhibitor is
recommended to prevent corrosion (sludge) damaging the boiler
and system;
If anti-freeze substances are to be used in the system, check carefully
that they are compatible with the metals used in the circuit.
ARISTON suggests the use of suitable anti-freeze products such as
Fernox ALPHI 11, which will prevent rust and incrustation taking
place.
Periodically check the pH balance of the water/anti-freeze mixture
of the boiler circuit and replace it when the amount measured is out
of the range stipulated by the manufacturer (7 < pH < 8).
DO NOT MIX DIFFERENT TYPES OF ANTI-FREEZE
In under-floor systems, the use of plastic pipes without protection
against penetration of oxygen through the walls can cause corrosion
of the systems metal parts (metal piping, boiler etc), through the
formation of oxides and bacterial agents.
To prevent this problem it is necessary to use pipes with an “oxygen
proof barrier”, in accordance with standards DIN 4726/4729. If pipes
of this kind are not used, keep the system separate by installing
heat exchangers of those with a specific system water treatment.
IMPORTANT
Failure to carry out the water treatment procedure will invalidate
the appliance guarantee.
System Controls
The boiler is electrically controlled and is suitable for most modern
electronic time and temperature controls. The addition of such
external controls can be beneficial to the efficient operation of the
system.
The boiler connections for external controls are 240V. ARISTON
supply a range of wired and wireless system controls. Contact your
supplier for more details.
Location
The boiler can be installed on any suitable internal wall (suitable
sound proofing may be required when installing onto a stud
partition wall). Provision must be made to allow for the correct
routing of the flue and siting of the terminal to allow the safe and
efficient removal of the flue products. A compartment or cupboard
may be used provided that it has been built or modified for this
purpose. It is not necessary to provide permanent ventilation for
cooling purposes. Detailed recommendations are given in BS 5440
Part 2. If it is proposed that it is to be installed in a timber framed
building then reference should be made to IGEM Document, IGE/
UP/7 or advice sought from Gas Safe.
Where a room sealed appliance is installed in a room containing
a bath or shower, the appliance and any electrical switch or
appliance control, utilising mains electricity should be situated
specifically in accordance with current IEE Wiring Regulations.
For unusual locations, special procedures may be necessary. BS
6798 gives detailed guidance on this aspect.

12 /
INSTALLATION
Codensate Discharge
The condensate discharge hose from the boiler must have
a continuous fall of 2.5oand must be inserted by at least
50mm into a suitable acid resistant pipe - e.g. plastic waste or
overflow pipe. The condensate discharge pipe must have a
minimum diameter of 22mm, must have a continuous fall and
preferably be installed and terminated to prevent freezing.
The discharge pipe must be terminated in a suitable position:
i) Connecting into an internal soil stack (at least 450mm above the
invert of the stack). A trap giving a water seal of at least 75mm
must be incorporated into the pipe run, there also must be an air
beak upstream of the trap.
ii) Connecting into the waste system of the building such as a
washing maching or sink trap. The connection must be upstream
of the washing machine/sink. If the connection is downstream
of the waste trap then an additional trap giving a minimum
water seal of 75mm and an air break must be incorporated in
the pipe run, as above.
iii) Terminating into a gully, below the grid level but above the
water level
iv) Into a soakaway
Note: If any condensate pipework is to be installed externally then
it should be kept to a minimum and be insulated with a waterproof
insulation and have a continuous fall. The total length of external
pipe used should not exceed 3 metres.
Some examples of the type of condensate terminations can be
found below.
1. Internal termination of condensate drainage pipe to internal stack.
2. External termination of condensate drainage pipe via internal
discharge branch (e.g. sink waste) and condensate siphon.
3. External termination of condensate drainage pipe via internal
discharge branch (e.g. sink waste - proprietary fitting).
4. External termination of condensate drainage pipe via condensate
siphon
Tundish
trap
Tundish
trap
Tundish
Tundish
External pipe length
max. 3 metres
(must be insulated)
Condensate Discharge
Push fit the flexible condensate pipe into the outlet spigot on the
appliance. Cut to length and locate outlet into a tundish

/ 13
INSTALLATION
Installing the Boiler
Please check that you are familiar with the installation requirement
before commencing work.
The installation accessories described in the following list are
included in the boiler packaging:
- Hanging bracket
- A paper template (showing the dimensions of the boiler with 5
mm side clearances)
- Gas isolation valve (compression)
- Washers
- Installation, Servicing and User manual
- Flue gasket
- Fixing screws
Method of positioning the boiler on the wall
The paper template can be used to ensure the correct positioning of
kitchen cabinets etc.
The paper template has to be fixed to the wall and used to locate
the position of the hanging bracket and the centre for the flue hole.
Drill and plug the wall and secure the hanging bracket using the
screws provided, ensure the hanging bracket is fixed square on the
wall. Remove the boiler from its packaging.
Place the boiler on the hanging bracket.
Note: the appliaNce must Not be fitted oN acombustible wall surface.
Connecting the boiler to the system
- Remove the boiler casing as described on page 14
- Remove the cap and connect the gas isolation valve to the boiler
using the washer provided (C) page 13;
Filling the system/condensate discharge
Fill the central heating and bleed air from the system as described in
the Commissioning Instructions.
The system should be carefully checked for leaks, as frequent refilling
could cause premature system corrosion or unnecessary scaling of
the heat exchanger.
Pay special attention not to bend the condensate silicone drain
pipe is such a way as to interrupt the flow. Please only use drain
pipe material compatible with condensate products (refer to BS
6798:2000).
The condensate flow can reach 2 litres/hour because of the acidity of
the condensate products (Ph close to 2), take care before operation.
See page 12 for condensate discharge options.
Gas connection
Make sure, using the labels on the packaging and the data plate on
the appliance itself, that the boiler is in the correct country and that
the gas category for which the boiler 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 specific legal requirements and in accordance with
the maximum power of the boiler; ensure the gas isolation valve is
connected correctly, see drawing opposite.
Check that the supplied gas corresponds to the type of gas for which
the boiler 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 boiler is suitable, because if it
is insufficient the power may be reduced, causing inconvenience for
the user.
CC. Gas Inlet

14 /
INSTALLATION
Central Heating connection
A
B
A. Central Heating Return (pipes 22mm)
B. Central Heating Flow
Note: For IE use 3/4"» + 1/2"
olives provided
Instructions for opening the casing and performing an internal
inspection
Before performing any work on the boiler, first disconnect it from the
electrical power supply using the external bipolar switch, removing
the fuse and shutting off the gas valve.
To access the inside of the boiler, the following is necessary:
1. Loosen the two screws on the front casing (a), pull it forwards and
unhook it from the upper pins (b)
3. Remove the control panel (c)
4. Unhook the two clips on the combustion chamber panel and lift
off (d).
(a)
(b)
(c)
(d)

/ 15
INSTALLATION
BEFORE THE EQUIPMENT IS USED, FOR THE
FIRST TIME THE TRAP MUST BE FILLED WITH
WATER. TO DO THIS, ADD APPROXIMATELY 1/4
LITRE OF WATER VIA THE FLUE OUTLET BEFORE
FITTING THE FLUE SYSTEM, OR UNSCREW THE
CAP ON THE TRAP POSITIONED UNDERNEATH
THE BOILER, FILL IT WITH WATER AND REFIT IT
WARNING!
INSUFFICIENT WATER IN THE TRAP CAN
TEMPORARILY CAUSE THE FLUE GAS TO BE
EXPELLED INTOTHE SURROUNDING AMBIENT
AIR
Water circuit diagram
4
1
3
2
6
7
5
AB
C
1. C.H. flow temperature probe
2. Burner
3. Detection electrode
4. C.H. return temperature probe
5. Condensate trap
6. Modulating fan

16 /
INSTALLATION
Connecting the Flue
Flue System
The provision for satisfactory flue termination must be made as de-
scribed in BS 5440-1.
The appliance must be installed so that the flue terminal is exposed
to outdoor air.
The terminal must not discharge into another room or space such as
an outhouse or lean-to.
It is important that the position of the terminal allows a free passage
of air across it at all times.
The terminal should be located with due regard for the damage or
discolouration that might occur on buildings in the vicinity, it must
also be located in a place not likely to cause nuisance.
In cold or humid weather water vapour may condense on leaving
the flue terminal.
The effect of such “steaming” must be considered.
If the terminal is less than 2 metres above a balcony, above ground
or above a flat roof to which people have access, then a suitable
stainless steel terminal guard must be fitted.
The minimum acceptable spacing from the terminal to obstructions
and ventilation openings are specified in Fig. 1.
- A Directly below an opening, window, etc 300 mm
- B Horizontally to an opening, window, etc 300 mm
- C Below gutters, soils pipes or drain pipes 75 mm
- D Below eaves 200 mm
- E From vertical drain pipe or soil pipe 75 mm
- F From internal or external corner 300 mm
- G Above ground, roof or balcony level 300 mm
- H From a surface facing the terminal 600 mm
- I From a terminal facing a terminal 1200 mm
- J Vertically from a terminal on the same wall 1500 mm
- K Horizontally from an terminal on the same wall 300 mm
- L Fixed by vertical flue terminal
Fig. 1
118 mm
150 mm
Minimum Length = 500 mm
180 mm
Fig. 2

/ 17
INSTALLATION
Warning
The exhaust gas ducts must not be in contact with or close to
inflammable material and must not pass through building structures
or walls made of inflammable material.
When replacing an old appliance, the flue system must be changed.
Important
Ensure that the flue is not blocked.
Ensure that the flue is supported and assembled in accordance with
these instructions.
150 mm
118
* Min slope: 1˚
1˚= 17.5mm per metre
150 mm
* pente
Installation without extension
Installation with extension
Level
Level
Fitting the Coaxial Flue (Ø 60 / 100 Horizontal)
Contents:
1x Silicone O-Ring (60mm)
1x Elbow (90°)
2x Wall Seals (Internal & External)
1x Flue Pipe including Terminal (1 metre - 60/100)
2x Flue Clamps
4x Screws
2x Seals
Once the boiler has been positioned on the wall, fit the rubber flue
seal into the internal flue turret (see diagram opposite),
Insert the elbow into the socket and rotate to the required position.
note: It is possible to rotate the elbow 360° on its vertical axis.
Using the flue clamp, seals and screws supplied (Fig 4) secure the
elbow to the boiler.
The 1 metre horizontal flue kit (3318073) supplied is suitable for an
exact X dimension of 753mm.
Measure the distance from the face of the external wall to the face
of the flue elbow (X - Fig 2), this figure must now be subtracted from
753mm, you now have the total amount to be cut from the plain
end of the flue.
Draw a circle around the outer flue and cut the flue to the required
length taking care not to cut the inner flue, next cut the inner
flue ensuring that the length between the inner and outer flue is
maintained. (Fig 4).
e.g.
X = 555mm
753-555 = 198mm (Length to be cut from the plain end of the
flue).
Once cut to the required length, ensure that the flue is free from
burrs and reassemble the flue. If fitting the flue from inside of the
building attach the outer wall seal to the flue terminal and push
the flue through the hole, once the wall seal has passed through
the hole, pull the flue back until the seal is flush with the wall.
Alternatively, the flue can be installed from outside of the building,
the outer seal being fitted last.
Should the flue require extending, the flue connections are push fit,
however, one flue bracket should be used to secure each metre of
flue.
Note: See table for maximum and minimum flue runs.
slope
Fig. 3
Note: A Plume management kit is available for 60/100 horizontal
termination. Instructions for installation are supplied with the
Plume management kit.

18 /
INSTALLATION
Fitting the 5”Flue
(Ø 80 / 125 Horizontal/vertical) Once the boiler has been positioned on the wall, it is necessary to
insert the Ø80/125 adaptor (Fig. 5) for both horizontal and vertical
flue runs into the boiler flue socket (not supplied with flue kit - Part
No 3318095).
Push the adaptor onto the boilers flue connection, grease the seals
then add extensions or elbows as required, secure the adaptor,
using the clamp and screws provided.
To fit extensions or elbows it is first necessary to ensure that the lip
seal is fitted correctly into the inner flue, once verified, it is simply
necessary to push them together, no clamps are necessary to secure
the flue components.
Before proceeding to fit the flue, ensure that the maximum flue
length has not been exceeded (See the tables) and that all elbows
and bends have been taken into consideration, for each additional
90° elbow 1 metre must be subtracted from the total flue length,
and for each 45° 0.5 metres must be subtracted from the total flue
length (the height of the vertical adaptor and a 45° bend can be
seen in Fig.6 and a 90° bend in Fig. 7).
Note: DO NOT cut the vertical flue kit.
180 mm
Total length
of Vertical Kit
1240 mm
5" Adaptor
Part no: 3318095
* This length will vary
according to the type
of ashing installed
Useable length
of Vertical ue
575 mm*
Fig. 5
Clamp
Seal
Screws
Fig. 4
Fig. 6 Fig. 7

/ 19
INSTALLATION
Fitting the Coaxial Flue
(Ø 60 / 100 Vertical)
Note: See table for maximum and minimum flue runs.
Contents:
1x Conical Adaptor (60/100mm)
1x Vertical Flue Kit (80/125mm)
The vertical flue kit is supplied with a specially designed weather
proof terminal fitted, it can be used either with a flat roof or a
pitched roof.
The Vertical flue kits useable lengths with the pitched roof flashings
are indicated in Fig. 7.
Before proceeding to fit the flue, ensure that the maximum flue
length has not been exceeded (See the tables) and that all elbows
and bends have been taken into consideration, for each additional
90° elbow 1 metre must be subtracted from the total flue length,
and for each 45° 0.5 metres must be subtracted from the total flue
length (the height of the vertical adaptor and a 45° bend can be
seen in Fig. 8).
Mark the position of the flue hole in the ceiling and/or roof (see Fig.
7 for distance from wall to the centre of the flue).
Cut a 130mm diameter hole through the ceiling and/or roof and fit
the flashing plate to the roof.
DO NOT cut the vertical flue kit.
To connect the vertical flue kit directly to the boiler, place the vertical
starter kit (Part No. 3318079) (see Fig. 7) onto the exhaust manifold
and secure with the clamp, fit the vertical adaptor onto the vertical
starter kit (note: there is no need to use a clamp to secure this as it
is a push fit connection), the vertical flue kit must then be inserted
through the roof flashing, this will ensure that the correct clearance
above the roof is provided as the terminal is a fixed height.
Should extensions be required, they are available in 1 metre (Part No.
3318077), 500mm (Part No. 3318078) and they must be connected
directly to the vertical starter kit before connecting the adaptor to
allow the vertical flue kit to be fitted. In the event that extension
pieces need to be shortened, they must only be cut at the male end
and it must be ensured that the inner and outer flue remain flush.
When utilising the vertical flue system, action must be taken to
ensure that the flue is supported adequately to prevent the weight
being transferred to the appliance flue connection by using 1 flue
bracket per extension.
When the flue passes through a ceiling or wooden floor, there must
be an air gap of 25mm between any part of the flue system and any
combustible material. The use of a ceiling plate will facilitate this.
Also when the flue passes from one room to another a fire stop must
be fitted to prevent the passage of smoke or fire, irrespective of the
structural material through which the flue passes.
180 mm
Vert Adaptor
(supplied with ue kit)
Vertical Starter
Part No: 3318079
* This length will vary
according to the type
of ashing installed
Total length
of Vertical Kit
1355 mm
Useable length
of Vertical ue
690 mm*
Fig. 7
Fig. 8

20 /
INSTALLATION
Fitting the Twin Pipe (Ø80 / 80)
Note: See table for maximum and minimum flue runs.
Where it is not possible to terminate the flue within the distance
permitted for coaxial flues, the twin flue pipe can be used by fitting
a special adaptor to the flue connector and using the aperture for
the air intake located on top of the combustion chamber.
Always ensure that the flue is adequately supported, using one flue
bracket per extension and avoiding low points. (ARISTON supply
suitable clamps as Part No. 705778).
To utilise the air intake it is necessary to:
1) Take the air intake cover off the top of the appliance
2) Assemble the flange on the header supplied with the boiler
3) Insert the header on the tube or the elbow up until the lower stop
(you do not have to use the washer).
4) Insert the elbow/header in the boiler air intake hole and fasten it
with screws.
The twin flue pipes can be fitted with or without additional elbows
and need no clamps, simply ensure that the lip seal is inserted in the
female end of the flue pipe and push the extension piece fully into
the previous section of flue pipe or elbow, check that the lip seal is
not dislodged when assembling the flue (greasing the seal will aid
assembly).
Twin pipe can also be converted back to Coaxial flue to enable
vertical termination with a coaxial kit by using the pipe bridge (Twin
- Coaxial Adaptor - Part No. 3318089). When running the twin flue
pipe vertically.
It is not possible to terminate concentrically horizontally. Termination
is only possible with separate air and exhaust terminals.
When siting the twin flue pipe, the air intake and exhaust terminals
must terminate on the same wall, the centres of the terminals must
be a minimum of 280 mm apart and the air intake must not be sited
above the exhaust terminal (refer to Fig. 10). The air intake pipe can
be run horizontally, however, the terminal and the final 1 metre of
flue must be installed either horizontally or with a slight fall away
from the boiler to avoid rain ingress.
It is also strongly recommended that the air intake pipe run be
constructed of insulated pipe to prevent condense forming on the
outside of the tube.
Ensure the exhaust tube has a minimum fall back to the boiler of 1˚ /
metre (1˚ = 17.5mm/metre)
The maximum permissible flue length for twin flue is dependent on
the type of run used (see table on page 22).
For further information relating to flue runs not illustrated, please
contact the Technical Department on 0870 241 8180.