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Unvented water heater
3
“Enactment of Directive 2012/19/EU governing electrical and electronic waste (WEEE)”
The barred bin symbol on the appliance and its packaging indicates that the product must be scrapped separately from other waste at
the end of its service life. The user must therefore hand the equipment over to a sorted waste disposal facility for electro-technical and electronic
equipment at the end of its service life.
Alternatively, he may return the equipment to the retailer at the time of purchase of a new equivalent type of appliance. Electronic equipment of size less than
25 cm can be handed over to any electronics equipment retailer whose sales area is at least 400 m2 for disposal free of charge and without
any obligation to purchase new product.
Sorted waste collection for recycling, treatment and environmentally compatible scrapping contributes to the prevention of damage to the
environment and promotes reuse/recycling.
62
4
GENERAL SAFETY INSTRUCTIONS
CAUTION!
1. This manual is an integral part of the product. Keep it with care
with the appliance, and hand it on to the next user/owner in
case of change of property.
2. Read the instructions and warning in this manual carefully,
they contain important information regarding safe installation,
use and maintenance.
3. The appliance must be installed and commissioned by a qualified
technician in accordance with local legislation and health and safety
regulations. All power circuits must be shut off before you open the
front panel and access the electrical components.
4. DO NOT use the appliance for any other than its specified use. The
manufacturer is not liable for damage resulting from improper or
incorrect use or failure to observe the instructions given in this
manual.
5. Incorrect installation can result in damage to property and injury to
persons and animals; the manufacturer is not liable for the
consequences.
6. DO NOT leave the packaging materials (staples, plastic bags,
expanded polystyrene, etc.) within the reach of children - they can
cause serious injury.
7. The appliance may not be used by persons under 8 years of age,
with reduced physical, sensory or mental capacity, or lacking the
requisite experience and familiarity, unless under supervision or
following instruction in the safe use of the appliance and the hazards
attendant on such use. DO NOT permit children to play with the
appliance. User cleaning and maintenance may not be done by
unsupervised children.
8. DO NOT touch the appliance when barefoot or if any part of your
body is wet.
9. Any repairs, maintenance, plumbing and electrical connection must
be done by qualified technicians using original spare parts only.
Failure to observe the above instructions can compromise the safety
of the appliance and relieves the manufacturer of any liability for the
consequences.
10. The hot water temperature is regulated by a thermostat which also
acts as a resettable safety device to prevent dangerous overheating.
11. The electrical connection must be done as indicated in this manual.
12. If the appliance is equipped with a power cord, the latter may only
be replaced by an authorised service centre or professional technician.
13. Do not tamper with the overpressure safety device, if supplied
5
together with the appliance; trip it from time to time to ensure that
it is not jammed and to remove any scale deposits. In countries
which have enacted EN 1487, the appliance's intake pipe must be
equipped with a safety device compliant with the said standard,
calibrated to a maximum pressure of 0.7 MPa, including at least a
cock, check valve, safety valve and hydraulic load cutout.
14. It is normal that water drip from the overpressure safety device and
EN 1487 safety unit when the appliance is heating. For this reason
one must install a drain, open to the air, with a continuously
downwards sloping pipe, in an area not subject to subzero
temperatures. Make sure to drain the appliance when it is out of
service or in an area subject to subzero temperatures.
15. Make sure to drain the appliance when it is out of service or in an
area subject to subzero temperatures.
16. Water heated to over 50° C can cause immediate serious burns if
delivered directly to the taps. Children, disabled persons and the
aged are particularly at risk. We recommend installing a thermostatic
mixer valve on the water delivery line, marked with a red collar.
17. Do not leave flammable materials in contact with or in the vicinity
of the appliance.
6
GENERAL SAFETY STANDARDS
Symbols:
Danger of the appliance falling off the wall due
to structural collapse, or noisy operation
Install the appliance to a solid wall which is not
subject to vibration
Do not clean the appliance without having
first switched it off, pulled its power plug or
shut off its power switch
Electrocution hazard due to the presence of live
electrical equipment
Danger of fire due to overheating of
undersized electrical wires
Make the electrical hookup with cables of
adequate cross-section
Restore all safety and control functions after
working on the appliance and check that they
are operational before returning it to service
Damage or blocking of the appliance due to
improper control
Symbol
Warning Risk
Electrocution hazard due to damage to the
power cord, its plug or the socket
Do not start or stop the appliance by inserting/pulling
the power plug
Electrocution hazard due to bare live wires
Do not damage the power cord
Personal injury due to objects falling off the
appliance as a result of vibration
Do not leave objects on the appliance
Damage to the appliance or other property
due to objects falling off the appliance as a
result of vibration
Ref.
Do not open the appliance or remove from
its installation
Electrocution hazard due to the presence of live
electrical equipment Personal injury - burns
caused by overheated components and wounds
caused by sharp edges
Do not climb onto the appliance
Personal injury due to falling off the appliance
Damage to the appliance or other property due
to the appliance itself detaching from its mounting
Drain all components containing hot water, using
the bleed cocks, before handling them
Danger of burns
Descale the system as given in the product's
“safety sheet”; when doing so, ventilate the room,
wear safety clothing, make sure not to mix
products, and protect the appliance itself and
any adjacent objects
Personal injury due to contact of the skin and
eyes with acid, inhalation or ingestion of noxious
chemicals
Damage to the appliance and adjacent objects
due to corrosion by acid
Do not use insecticides, solvents or aggressive
detergents to clean the appliance
Damage to plastic and painted parts and
assemblies
!
!
6
7
8
9
!
!
!
2
3
!
4
!
1
!
!
5
!
!
10
11
12
Symbol Meaning
Failure to observe this warning can result in injury, which may even be fatal in certain
circumstances
Failure to observe this warning can result in damage or injury, even serious in certain circumstances,
to property, plants and animals
Observe the product's general and specific safety instructions.
!
!
7
Anti-legionella recommendations (European standard CEN/TR 16355)
Information
Legionella is a small bacterium, of stick-like form, and is found naturally in fresh water.
Legionnaire's disease is a serious pulmonary infection caused by inhalation of the
Legionella pneumophilia
bacterium and
other species of
Legionella
. The bacterium is frequently to be found in the plumbing of houses, hotels and water used in A/C
and air cooling systems. The most effective measure against infection is to prevent the bacterium proliferating in water circuits.
European standard CEN/TR 16355 provides guidelines for preventing the proliferation of Legionella in drinking water systems,
without substituting applicable local legislation.
General recommendations
“Conditions favourable to the proliferation of Legionella”. The following conditions are favourable to the proliferation of
Legionella:
Water temperature in the range 25 - 50 °C. To reduce the proliferation of Legionella, the water temperature be kept with
these limits to prevent them growing or reduce their growth to a minimum. If this is not possible, the drinking water
system must be sanitised thermally;
Stagnant water. To prevent water stagnating for a long time, the drinking water system must be flushed or made to run
abundantly at least once a week;
Nutrients, biofilms and sediment in the circuit, including boilers, etc. Sediment may promote the proliferation of Legionella
and should be regularly eliminated from water storage devices, boilers and expansion/holding tanks (for instance, once
a year).
As regards storage heater like the present, if:
1) the appliance is switched off for several months at a time or
2) the water temperature is kept constant in the range 25 - 50°C,
the Legionella bacterium may grow inside the tank. If such circumstances, to reduce the proliferation of the bacterium, one
must run a thermal sanitisation cycle.
This cycle is suited to use in domestic hot water systems and complies with the guidelines for the prevention of Legionella
given in Table 2 of standard CEN/TR 16355 (see below).
Table 2 - Types of hot water system
Separate hot and cold water
Mixed hot and cold water
No
storage
Storage
No storage
upline of the
mixer valves
Storage upline
of the mixer
valves
No storage
upline of the
mixer valves
No
circulation
of hot water
Circulation
of hot water
No
circulation
of mixed
water
Circulation
of mixed
water
No
circulation
of mixed
water
Circulation
of mixed
water
No
circulation
of mixed
water
Circulation
of mixed
water
No
circulation
of mixed
water
Circulation
of mixed
water
Ref. in
Enclosure C
Temperature
Stagnation
Sediment
C.1
-
-
-
C.1
-
-
-
C.2
50 °C
e
3 l
b
-
C.2
-
C.3
in
storage
heater
a
-
remove
c
C.2 C.4
50 °C
e
3 l
b
remove
c
C.4 C.5
thermal
disinfection
d
-
--
C.5
-
-
C.6
thermal
disinfection
d
3 l
b
-
C.6
-
C.7
in
storage
heater
a
-
remove
c
C.7
-
C.8
50 °C
e
thermal
disinfection
d
3 l
b
remove
c
C.6
-
thermal
disinfection
d
C.9
-
-
C.9
-
-
thermal
disinfection
d
C.10
3 l
b
-
a Temperature 55°C all day or at least 1h a day 60°C.
b Volume of water contained in the pipes between the circulation system and the most distant tap.
c Remove the sediment from the storage heater as required by local conditions, but no less frequently than once a year.
d Thermal disinfection for 20 minutes at 60°C, for 10 minutes at 65°C or 5 minutes at 70 °C at all delivery points at least once
a week.
e The water temperature in the circulation circuit may not fall below 50°C.
- Not required
This storage water heater is sold with a thermal disinfection cycle function not enabled for default; as a consequence, if, for
any reason, one of the above said “Conditions for Legionella growth” could occur; it’s hardly recommended to enable such
function rotating the knob up to maximum water temperature (>60°C).
However, the thermal disinfection cycle does not kill all Legionella bacteria in the storage tank. It follows that if the water
temperature setting is less than 55°C, the Legionella bacterium infection may reoccur.
Caution: the water temperature in the tank can cause immediate serious burns. Children, disabled persons and the aged
are particularly at risk of burns. Check the water temperature before taking a bath or shower.
Description of water heater
1) Hot water outlet (1/2” male BSP)
2) Temperature and pressure relief valve (30 litre only)
3) Cold water inlet (1/2” male BSP)
4) Control cover
5) Regulation knob
6) Heating neon
8
TECHNICAL SPECIFICATIONS
For the technical specifications, refer to the nameplate (the nameplate is located next to the water intake/outlet pipes).
Product information
10
6,6
15
7,4
30
12,8
Refer to the nameplate
Oversink Oversink OversinkUndersink Undersink
2,442 2,462 2,7752,691 2,675
XXS
S
15 dB
35,5% 35,3% 32,1%32,9% 33,0%
10 15 30
-
-
17
3.5bar
6bar
-
-
17
3.5bar
6bar
-
-
23
3.5bar
6bar
-
-
23
3.5bar
6bar
0.75 kWh/day
30 minutes
43
3.5bar
6bar
Over-sink (NEW EUROPRISMA 10/15 OR)
Under-sink (NEW EUROPRISMA10/15 UR)
Over-sink (NEW EUROPRISMA 30)
4
5
6
1 3
4
2
5
6
1 3
1 3
4
5
6
9
The power consumption data in the table and the other information given in the Product Data
Sheet (Enclosure A to this manual) are defined in relation to EU Directives 812/2013 and
814/2013.
Products equipped with regulator knobs have the thermostat positioned in the setting
condition at its set <ready to use> position shown in the Data Sheet (Enclosure A), used by
the manufacturer to declare the appliance's energy class.
This appliance is conforming with the international electrical safety standards IEC
60335-1 and IEC 60335-2-21.
The CE marking of the appliances attests its conformity to the following EC Directives,
of which it satisfies the essential requisites:
- LVD Low Voltage Directive: EN 60335-1, EN 60335-2-21, EN 60529, EN 62233, EN 50106.
- EMC Electro-Magnetic Compatibility: EN 55014-1, EN 55014-2, EN 61000-3-2, EN
61000-3-3.
- RoHS2 Risk of Hazardous Substances: EN 50581.
- ErP Energy related Products: EN 50440.
- EN 12897:2006
User instructions
PLEASE KEEP THIS BOOKLET FOR FUTURE REFERENCE
The heater is insulated to a high standard therefore it may be left on all the time. The
temperature of the water may be adjusted by turning the knob on the front of the
heater, allow half an hour for the temperature to stabilise between settings. Maximum
temperature is achieved with the knob turned fully clockwise. The <<E>> mark on the
regulation knob indicates an
<<
economy>>
setting and corresponds to a water
temperature of 55 - 60°C. In hard water areas we recommended a max. 60°C. The
neon light shows when the heating element is working, under control of the
thermostat. If in doubt ring Ariston Thermo UK Ltd. Technical department
03332407777 Customer service department 03332408777.
Note: The water heater does not have an “off or “low” setting.
Water Regulations and Byelaws
These regulations and byelaws ensure a good supply of wholesome water, and that
only approved materials, pipes and fittings are used to convey water.
Building Regulations
These are a statutory document and take priority over all other regulations and
recommendations. The installation of an unvented hot water system of over 15 litres
is classified as a “Controlled Service” and Regulation G3 applies. To meet the
requirements of the regulation, installation of an unvented system should be
undertaken by a “competent installer”.
All installations of unvented hot water storage systems having a capacity of more than
15 litres should be notified to the relevant Local Authority by means of building notice
10
or by the submission of full plans. It is important to note that it is a criminal offence to
install an unvented hot water storage system over 15 litres without notifying the Local
Authority.
Delivery
The EP models are supplied with the following:
EP unvented water heater (with factory-fitted T&P model 30L) x1
Wall bracket x1
Pressure relief valve set at 6 bar x1
Dielectric junctions x2
Tundish (model 30L only) x1
Expansion Vessel (model 30L only) x1
Check Valve (model 30L only) x1
Pressure reducing Valve (model 30L only) x1
Important note: Dielectric junctions must be fitted to all models as they prevent an
electrolytic reaction and safeguard against potential aggressive corrosion.
How the heater works
The heating element is controlled by a thermostat which senses the water
temperature. The operating temperature can be adjusted by the regulation knob on
the front of the heater.
In addition to the thermostat there is a thermal cut-out which is set to switch off the
power to the element if the thermostat fails and the water temperature rises too high.
Once the cut-out operates it can only be reset manually (this should be carried out by
the installer - see maintenance).
A magnesium anode is provided to prevent corrosion of the water container. The 30L
model has a temperature and pressure relief valve on top of the heater which is a
safety device to back-up the thermostat and thermal cut-out. It works by sensing an
excess water temperature or pressure and releasing the hot water to the discharge
tundish and drain.
The heater will only work in the vertical position as the element is shaped to heat the
water at the bottom of the tank.The inlet pipe needs to deliver cold water to the bottom
of the tank and the hot water outlet draws water from the top of the tank.
When water is heated it expands, in a small unvented water heater of this
type the expansion can normally be accommodated back into the cold water mains
(not model 30L).
Where this is not possible the installer will need to fit a set of cold water controls.
Note: If a valve i.e. a non return valve, water meter, pressure reducing valve or
any type of valve or fitting that acts as a non return valve is installed on the cold
water mains, this will prevent expansion. Therefore it will be necessary to install
an expansion vessel (see pages 12&13 figs 2 & 3).
Note: If in doubt always install a pressure reducing valve (limited to 3.5bar) and
expansion vessel.
6) No water at all.
Cause: Valve incorrectly fitted.
Debris in the mains.
Mains water supply turned off.
7) Grey metallic deposit in the water
Cause:Corrosion of the sacrificial anode.
(Note: Corrosion of the sacrificial anode is normal operation of the unit)
8) Rapid depletion of the sacrifical anode (see 7)
Cause: Di-electric junctions not fitted
Water softener fitted on incoming supply to water heater
(Softened will cause the anode to deplete more rapidly than hard water)
Note Whilst Ariston do not advise against the use of water softener devices, the
end user must be advised that rapid depletion of the sacrificial anode may
occur as a result of the softened water which can result in metallic grey deposit
in the water.
19
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