Ariston VLS EVO 45 Parts list manual

ASSEMBLY AND OPERATION INSTRUCTIONS
UNVENTED WATER HEATER

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GENERAL SAFETY INSTRUCTIONS
1. Read the instructions and warning in this manual carefully, they
contain important information regarding safe installation, use
and maintenance.
This manual is an integral part of the product. Hand it on to the
next user/owner in case of change of property.
2. The manufacturer shall not liable for any injury to people, animals or
damage to property caused by improper, incorrect or unreasonable
use or failure to follow the instructions reported in this publication.
3. Installation and maintenance must be performed by professionally
qualified personnel as specified in the relative paragraphs.
Only use original spare parts. Failure to observe the above instruc-
tions can compromise the safety of the appliance and drelieves the
manufacturer of any liability for the consequences.
4. DO NOT leave the packaging materials (staples, plastic bags, ex-
panded polystyrene, etc.) within the reach of children they can
cause serious injury.
5. 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 haz-
ards attendant on such use. DO NOT permit children to play with
the appliance. User cleaning and maintenance may not be done
by unsupervised children.
6. DO NOT ttouch the appliance when barefoot or if any part of your
body is wet.
7. Before using the device and after routine or extraordinary mainte-
nance, we recommend filling the appliance’s tank with water and
draining it completely to remove any residual impurities.
8. If the appliance is equipped with a power cord, the latter may only
be replaced by an authorised service centre or professional tech-
nician.
9. It is mandatory to screw o the water inlet pipe of the unit a safety
valve in accordance with national regulations. In countries which
have enacted EN 1487, the safety group must be calibrated to a
maximum pressure of 1487 MPa (0,7 bar) and include at least a cock,

3 / EN
check valve and control, safety valve and hydraulic load cutout.
10. Do not tamper with the overpressure safety device (valve or safety
group), if supplied together with the appliance; trip it from time to
time to ensure that it is not jammed and to remove any scale de-
posits.
11. It is normal water drips from the overpressure safety device when
the appliance is heating. For this reason, the drain must be con-
nected, always left open to the atmosphere, with a drainage pipe
installed in a continuous downward slope and in a place free of ice.
12. Make sure you drain the appliance and disconnect it from the pow-
er grid when it is out of service in an area subject to subzero tem-
peratures.
13. 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 thermostat-
ic mixer valve on the water delivery line, marked with a red collar.
14. Do not leave flammable materials in contact with or in the vicinity of
the appliance.
15. Do not place anything under the water heater which may be dam-
aged by a leak.

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LEGIONELLA BACTERIA FUNCTION
Legionella are small rod shaped bacteria which are a natural constituent of all fresh waters. Legionaries’
disease is a pneumonia infection caused by inhaling of Legionella species. Long periods of water stag-
nation should be avoided; it means the water heater should be used or flushed at least weekly.
The European standard CEN/TR 16355 gives recommendations for good practice concerning the pre-
vention of Legionella growth in drinking water installations but existing national regulations remain in
force.
This electronic storage water heater is sold with a thermal disinfection cycle function enabled by default.
Every time the product is switched on and every 30 days, the thermal disinfection cycle runs to heat the
water heater up to 60°C.
Warning: when this software has been carrying out the thermal disinfection treatment, water tempera-
ture can cause burns. Feel water before bathing or showering.
DESCRIPTION OF WATER HEATER
1. Hot water outlet (1/2 male BSP)
2.Temperature and pressure relief valve
3.Cold water inlet (1/2 male BSP)
4.Regulation keyboard
4
2
13

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TECHNICAL CHARACTERISTICS
For the technical specifications, refer to the nameplate (the nameplate is located next to the water in-
take/outlet pipes).
TABLE 1 - PRODUCT INFORMATION
Product range VLS EVO
45
VLS EVO
80
VLS EVO
45 WiFi
VLS EVO
80 WiFi
Weight when empty kg 21 32 21 32
Weight when full kg 66 112 66 112
Installation Vertical Vertical Vertical Vertical
Model Refer to the nameplate
SMART X X X X
Q
elec
kWh 6,79 7,125 6,79 7,125
Q
elec , week, smart
kWh 25,467 27,141 25,467 27,141
Q
elec , week,
kWh 28,758 32,041 28,758 32,041
Load profile MMMM
L
wa
dB 15
η
wh
39,1% 39,0% 39,1% 39,0%
V40 L 77 115 77 115
Heat loss kWh/day 0,964 1,317 0,964 1,317
Heat up times [15-60°C] minutes 60 112 29 56
Maximum inlet pressure [rated pressure] bar 12
Maximum design pressure bar 6
Set operating pressure expansion valve bar 6
Pre-charge pressure of the expansion vessel bar 3,5
Set opening T&P relief valve bar 7
Capacity L 45 80 45 80
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.
The products without the label and the data sheet for water heaters and solar devices, stipulated in
regulation 812/2013, are not intended to be used in such assemblies.
The device is equipped with a smart function that allows you to adapt the consumption to the user pro-
files. If operated correctly, the device has a daily consumption of “Qelec (Qelec, week, smart/Qelec, week) less than
that of an equivalent product with no smart function”.
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 12897:2016
This product is in conformity with REACH regulations.

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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 sys-
tem 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 or by the submission of full plans.
It is important to note that it is a criminal oence to install an unvented hot water storage system over 15
litres without notifying the Local Authority.
Delivery
The products are supplied with the following:
Unvented water heater (with factory-fitted T&P) x1
Pressure relief valve set at 6 bar x1
Dielectric junctions x2
Tundish x1
Expansion Vessel x1
Check Valve x1
Pressure reducing Valve x1
Important note: Dielectric junctions must be fitted to all models as they prevent an electrolytic reac-
tion and safeguard against potential aggressive corrosion.
If the supplied Dieletric Junctions are not fitted this could void the warranty.
INSTALLING NORMS (for the installer)
Before installing the heater read these instructions in full.
If you are unsure please contact our technical service department (03332407777).
The installation must comply with all relevant Water Regulations/Byelaws and Building Regulations.
The installer should check with the local water authority for confirmation of the maximum water
supply pressure.
The appliance should be left packed until it is ready to be installed. When unpacking take care not to
damage the temperature and pressure relief valve on the top of the heater.
A drain has to be provided for any water discharged through the safety valves.
A cold water supply pressure between 1 and 3.5 bar is required (if the mains pressure is above 3.5 bar
a pressure reducing valve must be installed). Please note that turning down the stop-cock will reduce
flow not pressure.
The outlet pressure from the reducing valve (if supplied) is 3.5 bar.
A 240 VAC; 3 kW single phase electrical supply is required

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This product is a device that must be installed vertically in order to operate correctly. Once installa-
tion is complete, and before any water is added or the power supply is connected, use a measuring
instrument (i.e. a spirit level) to check that the device has been installed perfectly vertical.
The appliance heats water to a temperature below boiling point. It must be linked up to a mains water
supply according to the appliance performance levels and capacity.
Before connecting the appliance, it is first necessary to:
- Check whether the characteristics (please refer to the data plate) meet the customer’s requirements.
- Make sure the installation conforms to the IP degree (of protection against the penetration of liquids)
of the appliance according to the applicable norms in force.
- Read the instructions provided on the packaging label and on the appliance data plate.
This appliance was designed to be installed only inside buildings in compliance with the applicable
norms in force. Furthermore, installers are requested to keep to the following advice in the presence of:
- Damp: do not install the appliance in closed (unventilated) and damp rooms.
- Frost: do not install the appliance in areas where the temperature may drop critically and there may
be a risk that ice may form.
- Sunlight: do not expose the appliance to direct sun rays, even in the presence of windows.
- Dust/vapours/gas: do not install the appliance in the presence of particularly dangerous substances
such as acidic vapours, dust or those saturated with gas.
- Electrical discharges: do not install the appliance directly on electrical supplies that aren’t protected
against sudden voltage jumps.
In the case of walls made of bricks or perforated blocks, partition walls featuring limited static, or mason-
ry dierent in some way from those stated, you first need to carry out a preliminary static check of the
supporting system.
The wall-mounting fastening hooks must be designed to support a weight that is three times higher than
the weight of the water heater filled with water.
Fastening hooks with a diameter of at least 12 mm are recommended.
To facilitate maintenance, make sure there is a clearance of at least 50 cm inside the enclosure for ac-
cess to the electrical equipment.
PLUMBING WARNING:
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 figure below).
Note: If in doubt always install a pressure reducing valve (limited to 3.5bar) and expansion vessel.
The outlet from temperature and pressure relief valve/pressure relief valve must not be for any other
purpose.
Take great care not to allow any swarf into the pipe work or fittings, as this might impair the operation of
the safety valve(s). The water connection may be carried out as per the following:

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PRESSURE + TEMPERATURE
RELIEF VALVE
DRAIN
(not supplied)
HOT SUPPLY
15/22 mm
15 mm
COLD MAINS-IN
15/22 mm
TUNDISH
EXPANSION
RELIEF PIPE
EXPANSION
VASSEL
COMBINATION
VASSEL
Do not fit any stop cocks or isolating valves within the distance required for expansion. If a pressure re-
ducing valve is needed, due to a mains pressure of over 3.5 bar, an expansion control kit must be fitted
regardless of expansion pipework installed. The expansion distances quoted are for 15mm pipes and
can be approximately halved for 22mm pipes.
The appliance must not be supplied with water of hardness less than 12°F, not with especially hard water
(greater than 25°F); we recommend installing a water softener, properly calibrated and controlled - do
not allow the residual hardness to fall below 15°F.
The appliance is covered under the Building Regulations and therefore it is not possible to accommo-
date the expansion water within the system pipe work and consequently a set of expansion controls
must be installed.
Note: The discharge from relief valves must be made in a safe and conspicuous manner.
Please note that in all cases the dielectric junctions must be connected to the heater before any
other connection is made (these prevent an electrolytic reaction).

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If the supplied Dielectric Junctions are not fitted this could void the warranty.
Only the use of copper pipe is recommended for connection to the heater. If any other material is
used it must be able to withstand 90°C at 7 bar pressure for long periods.
No valve must be fitted between the expansion/pressure relief valve and the water heater.
All other required safety components to install the appliance are supplied as a kit with the appliance:
15 mm pressure reducing valve set at 3.5bar. Expansion vessel (charge pressure set at 3.5bar)”
DISCHARGE PIPE WORK NOTE:
The following guidelines refer to Building Regulation G3. It is good practice to follow these guide-
lines for all relief valve discharge pipe work.
1) The tundish must be vertical and fitted within 600 mm of the temperature & pressure relief valve and
must be located with the cylinder. The tundish must also be in a position visible to the occupants, and
positioned away from any electrical devices. The discharge pipe from the tundish should terminate in
a safe place where there is no risk to persons in the vicinity of the discharge and to be of metal.
2) Discharge pipes from the temperature & pressure relief and pressure relief valve may be joined
together.
3) The pipe diameter must be at least one pipe size larger than the nominal outlet size of the safety de-
vice unless its total equivalent hydraulic resistance exceeds that of a straight pipe 9 m long.
i.e. Discharge pipes between 9 m and 18 m equivalent resistance length should be at least 2 sizes
larger than the nominal outlet size of the safety device. Between 18 m and 27 m at least 3 times larger,
and so on.
Bends must be taken into account in calculating the flow resistance.
See the following figure and the Table 2.
4) The discharge pipe must have a vertical section of pipe at least 300 mm in length, below the tundish
before any elbows or bends in the pipe work.
5) The discharge pipe must be installed with a continuous fall.
6) The discharge must be visible at both the tundish and the final point of discharge, but where this is
not possible or practically dicult; there should be clear visibility at one or other of these locations.
Examples of acceptance are:
i) Ideally below a fixed grating and above the water seal in a trapped gully.
ii) Downward discharges at a low level; i.e. up to 100 mm above external surfaces such as car parks,
hard standings, grassed areas etc. These are acceptable providing that where children may play or
otherwise come into contact with discharges, a wire cage or similar guard is positioned to prevent
contact, whilst maintaining visibility.
iii) Discharges at high level; i.e. into a metal hopper and metal down pipe with the end of the discharge
pipe clearly visible (tundish visible or not). Or onto a roof capable of withstanding high temperature
discharges of water 3 m from any plastic guttering systems that would collect such a discharge
(tundish visible).

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iv) Where a single pipe serves a number of discharges, such as in blocks of flats, the number served
should be limited to no more than 6 systems so that any installation can be traced reasonably easily.
The single common discharge pipe should be at least one pipe size large than the largest individual
discharge pipe to be connected. If unvented hot water storage systems are installed where discharg-
es from safety devices may not be apparent i.e. in dwellings occupied by the blind, infirm or disabled
people, consideration should be given to the installation of an electronically operated device to warn
when discharge takes place. Note: The discharge will consist of scalding water and steam.
Asphalt, roofing felt and non-metallic rainwater goods may be damaged by such discharges.
Table 2
Sizing of copper discharge pipe “D2” for common temperature valve outlets
Valve
outlet size
Minimum
size of
discharge
pipe D1*
Minimum size of
discharge pipe
D2* from tundish
Maximum resistance
allowed, expressed as
a length of pipe
(i.e. no elbow or bends)
Resistance created
by each elbow or
bend
G 1/2 15 mm 22 mm
28 mm
35 mm
Up to 9 m
Up to 18 m
Up to 27 m
0.8 m
1.0 m
1.4 m
G 3/4 22 mm 28 mm
35 mm
42 mm
Up to 9 m
Up to 18 m
Up to 27 m
1.0 m
1.4 m
1.7 m
G 1 28 mm 35 mm
42 mm
54 mm
Up to 9 m
Up to 18 m
Up to 27 m
1.4 m
1.7 m
2.3 m
600 mm Max.
300 mm
Min.
Temperature & pressure
relief valve
Metal discharge pipe (D1) from
temperature & pressure relief valve.
to tundish.
Metal discharge pipe (D2) from tundish
with continuous fall. See Table 2 and worked
example.
Tundish
Fixed grating
Trapped gulley
Discharge below
fixed grating.
(see page 6 for
alternative points
of discharge).
Suggest ways of terminating discharge pipes safely