Ariston EP 30 R 3 KW User manual

Unvented water heater

Description of water heater
1)Hot water outlet
2)Temperature and pressure relief
valve (30 litre only)
3)Cold water inlet
4)Control cover
5)Regulation knob
6)Heating neon
Technical data
160 160 185
Over-sink (EP 10/15 OR)
Over-sink (EP 30 R 3KW) Under-sink (EP 10/15 UR)
MODEL
Approval
Capacity(litres)
Current (A)
Tension (V~)
Power (W)
Immersion Heater Length (mm)
Immersion Heater Type
Immersion Heater Refernce Number
Pressure max.
T & P valve setting
Weight with water
Moisture protection
EP 10 UR
2 KW
EP 10 UR 3KW
EP 10 OR 3KW
EP 15 UR
2 KW
EP 15 UR 3KW
EP 15 OR 3KW
EP 30 R
3 KW
WRAS WRAS WRc
10 1015 15 30
8.7 13
6 bar; 12 bar with pressure reducing valve
n/a 90°C/7bar
16 kg 18 kg22 kg 24 kg 45 kg
DRIP PROOF IPX1
1
13
2000 3000 3000
220-240 V (50/60 Hz)
Single Phase
BS 3456 Section 2.21
n/a

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 MTS (GB) Limited. [phone].
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 or by the submission of full plans. It is important
to note that it is a criminal offense to install an unvented hot water storage
system over 15 litres without notifying the Local Authority.
Delivery
The Europrisma is supplied with the following:
Europrisma unvented water heater (with factory-fitted T&P EP 30 R 3KW) x1
Wall bracket x1
Pressure relief valve set at 6 bar (not model EP 30 R 3KW) x1
Dielectric junctions x2
Tundish (model EP 30 R 3KW only) x1
2

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 EP 30 R 3KW 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 EP 30 R 3KW).
Where this is not possible the installer will need to fit a set of cold water
controls.
Installation instructions
Before installing the heater read these instructions in full. If you are
unsure please contact our technical service department (01494
539579).
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.
a) SITING & FIXING
WARNING: The appliance should be left packed until it is
ready to be installed. When unpacking the EP 30
R 3KW model 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.
3

Access to the heater is not normally needed on a day-to-day basis, but
300mm clearance to the front of the water heater sould be kept for
servicing and maintenance
A cold water supply pressure between 1 and 5.5 bar is required (if the
mains pressure is above 5.5 bar a pressure reducing valve will need
to 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.
Position the heater against the wall and mark the position of the hooked
wall bracket. Fasten the wall bracket to wall using suitable screws and wall
plugs (ensure that wall is suitable to support the unit, allowing for the extra
weight of water when it is full). Hang the heater on the bracket making sure
that the heater is pulled well down on to the bracket, if necessary by forcing
the hooks into the foam insulation.
b) PLUMBING
WARNING: 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:
1) Using the feed pipe to accommodate expansion
(Schedule 2, Section 6: Paragraph 15 of the Water
Supply (Water Fittings) Regulations 1999 and the Water
Byelaws 2000, Scotland) (Fig. 1).
Do not fit any stop-cocks or non-return valves within the distance required for
expansion. If a pressure reducing valve is needed, due to a mains pressure of
over 5.5 bar, it must be fitted outside of the expansion distance. The distances
quoted are for 15 mm pipe these can be approximately halved for 22 mm pipe
to shorten the distance required for expansion.
Dielectric
junctions
Hot Cold
Pressure relief valve
(6 bar)
Nearest cold water
draw-off
Pressure reducing valve
(set at 3.5 bar)
if mains > 6 bar Isolating valve
(fixed jumper or
1/4 turn ball type)
Cold
water
mains
Supply to other parts
of plumbing system
2.8 m (10 l) or 4.2 m (15 l) of 15 mm pipe
is required for expansion
Discharge
Fig. 1
EP 10/15
(Note this system is not
suitable for EP 30 R 3KW)
4

2) Using a set of expansion controls
(Fig. 2 & 3).
If it is not possible to accommodate the expansion in the system pipe work,
it is then necessary to use a set of expansion controls. These comprise of
an expansion vessel and non-return valve (Kit A) and generally a pressure
reducing valve (Kit B). It is however possible to use Kit A without Kit B, but
the mains water pressure must never reach over 3.5 bar for the expansion
vessel to operate correctly. Therefore if the value of mains water pressure
cannot be guaranteed Kit B should be installed.
Dielectric
junctions
Hot Cold
Pressure relief valve
(6 bar)
Nearest cold water
draw-off Pressure reducing valve
(set at 3.5 bar) Isolating valve
(fixed jumper or
1/4 turn ball type)
Cold
water
mains
Expansion vessel
(charge at set 3.5 bar)
Non-return
valve
Supply to other parts
of plumbing system
Discharge
Fig.. 2
EP 10/15
Dielectric
junctions
Hot Cold
Pressure relief valve
(6 bar)
Discharge to drain
Nearest cold water
draw-off Pressure reducing valve
(set at 3.5 bar) Isolating valve
(fixed jumper or
1/4 turn ball type)
Cold
water
mains
Expansion vessel
(charge set at 3.5 bar)
Non-return
valve
Supply to other parts
of plumbing system
Temperature & pressure
relief valve (7 bar/90˚C)
Tundish
Fig. 3
EP 30 R 3KW
5

The EP 30 R 3KW is covered under the Building Regulations and therefore
it is not possible to accommodate 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; therefore a tundish (Kit C) is available for 10 and 15
litre units if required.
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).
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.
c) DISCHARGE PIPE WORK
NOTE: The following guidelines refer to Building
Regulation G3. It is good practice to follow these
guidlines for all relief valve discharge pipe work.
1) The tundish must be vertical and fitted within 500 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 device unless it’s 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 fig..5 and 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 difficult; there should
6

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).
iv) Where a single pipe serves a number of discharges, such as in blocks
of flats, the number served should be limited to not 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 discharges 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.
7
500 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).
Fig.. 4
Suggest ways of terminating discharge pipes safely

Worked example
The example below is for a G 1/2”temperature & pressure relief valve with
a discharge pipe (D2) having 4 no. elbows and length of 7 m from the
tundish to the point of discharge.
From Table 2
Maximum resistance allowed for a straight length of 22 mm copper
discharge pipe (D2) from G 1/2”T & P valve is 9 m.
Subtract the resistance for 4 no. 22 mm elbows at 0.8 m each = 3.2 m.
Therefore the maximum permitted length equates to: 5.8 m.
As 5.8 m is less than the actual length of 7 m therefore calculate the next
largest size.
Maximum resistance allowed for a straight length of 28 mm pipe (D2) from
G 1/2”T & P valve equates to: 18 m.
Subtract the resistance for 4 no. 28 mm elbow at 1.0 m each = 4 m.
Therefore the maximum permitted length equates to: 14 m
As the actual length is 7 m, a 28 mm (D2) copper pipe will be satisfactory.
d) ELECTRICAL
WARNING: The appliance must be earthed
The electrical installation must be in line with the current I.E.E. wiring
regulations.
A mains supply of 240 VAC 3 kW (13 amps) is required (Fig. 5 & 6)
Heat resisting cable, round 3 core 1.5 mm (to BS 6141 table 8) should be
used to connect to the electrical supply through either:
- a 13 amp socket to BS 1363; or
- a double pole fused isolating switch with a contact separation of 3 mm
minimum on each pole.
The cable enters the terminal compartment through a tube embedded in
8
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
Table 2
Sizing of copper discharge pipe “D2”for common temperature valve outlets.

the foam insulation, the entrance to this tube is on the right hand side at
the bottom.
Flexible cables are colour coded as follows:
Brown.................................................. live
Blue............................................... neutral
Green and yellow............................. earth
To enter into the terminal compartment unscrew the 4 screws on the cover.
Fig..5
EP 30 R 3KW wiring diagram
L
N
E
THERMAL
CUT-OUT THERMOSTAT
NEON
HEATING
ELEMENT
9
Fig..6
EP 10/15 wiring diagram
HEATING
ELEMENT
THERMAL
CUT-OUT THERMOSTAT
L
N
E
NEON
L1
L2
BIPOLAR SWITCH

e) COMMISSIONING
- Check that all the necessary components are supplied and for those not
factory fitted, that they are the type recommended by the manufacturer
for the particular water heater.
- Check that the water heater/components are undamaged.
- Check that the discharge pipe is plumbed so that it falls continuously and
that no taps, valves or other shut-off devices are installed in the pipe.
- Check that the discharge pipe drains safely to waste and is readily
visible.
- Check, in the case where some components are not factory fitted, that
they are marked so as to refer to the warning label on the water heater.
- Open all outlet taps.
- Turn on the mains water supply.
- Close taps in turn as water flow stabilises with no air bubbles.
- Check for leaks.
- Check that no water is passing through the safety valve(s).
- Test the operation of the safety valve(s) by lifting/turning the lever/knob,
and observing that water flows through and safely to waste.
- Switch on electricity and set thermostat to at 60°C to reduce the build up
of scale in hard water areas.
- Check the water heats up.
- Check that <<warning to user label>> is secure and visible on the heater
and related warning labels are fitted to the controls.
- Demonstrate operation to user, including operation of safety valve(s) and
what to do if it/they operate(s).
- Give this handbook to the user and discuss future maintenance.
Maintenance
a) For the user
In order to obtain the best performance from the heater, the sacrificial
anode must be checked every year. If the heating element is heavily
coated with scale we recommend descaling and removing any lime deposit
from the heater at the time of this inspection. Where the additional cold
water controls are fitted , the expansion vessel will need to be recharged
by the installer.
b) For the installer
WARNING: Switch off the power first
Access to the electrical components, the magnesium anode and water
container is gained by unscrewing the 4 screws on the front cover.
If the thermal cut-out has operated the cause must be found before
resetting.
To drain the heater close the service valve and:
10

i) for under-sink models (EP 10 UR - EP 15 UR) disconnect pipes and
removed the heater from the wall.
ii) for over-sink models (EP 10 OR - EP 15 OR - EP 30 R 3KW) undo the
cold water supply pipe and open a hot water tap.
The heating element may be removed (after taking out the thermostat
phials on model EP 30 R 3KW) by undoing the M6 nut.
The assembly should then be turned through 90°anti-clockwise to ease
removal from the water container.
Once the element is free from the water container the anode may then
be inspected and removed if necessary.
When reassembling the cover make sure that the regulation knob is
coupled with the thermostat.
Check controls (where fitted) as per the following:
- Line strainer - with the water supply turned off remove screen from
strainer and clean of any detritus;
- Expansion vessel - with the water supply turned off and taps open, check
expansion vessel pressure and top up as necessary;
- Temperature & pressure relief valve - with the water supply turned on,
check manually by lifting the test lever/turning the test knob (ensure valve
closes after testing)
;
- Expansion relief valve - check manually by turning the test knob
(ensure
valve closes after testing)
;
- Discharge pipes (D1) - from both temperature & pressure relief and
expansion relief valve for obstructions;
- Tundish & discharge pipe (D2)- open either valve gradually to produce a
full bore discharge into tundish and D2 without any back pressure;
- Pressure reducing valve - check that the correct outlet pressure is being
maintained by recording the pressure at an in-line terminal fitting i.e. tap.
Fault finding
1)Pressure and temperature valve dripping/running all the time.
Cause: Thermal cut-out and thermostat have failed (this is only the
case if the water being discharged is near to boiling).
Mains pressure is above 7 bar. A pressure reducing valve must
be fitted (see page 4, Fig..1).
2)Pressure relief valve dripping/running all the time.
Cause: Mains pressure is above 6 bar. A pressure reducing valve must
be fitted (see page 5, Fig. 2).
11

3)Dripping while unit heating.
Cause: Not enough pipe work for expansion; or stop-cock, non-return
valve or pressure reducing valve has been fitted within the
distance required for expansion (see page 5, Fig.3). If an
expansion vessel has been fitted, the charge may have failed.
4)No hot water.
Cause: Thermal cut-out has operated.
The heating element has burnt-out.
The thermostat is faulty.
5)Milky water.
Cause: This is a result of heavily limed and oxygenated water being
heated. This is harmless and the cause is the water and not
the heater.
6)No water at all.
Cause: Valve incorrectly fitted.
Debris in the mains.
Mains water supply turned off.
12

Manufactured by:
Merloni TermoSanitari SpA
Viale Aristide Merloni, 45
60044 Fabriano (AN)
Italy
Tel. + 39 0732 6011
Telefax. + 39 0732 602331
Telex 560160
http://www.mtsgroup.com
Commercial subsidiary:
MTS (GB) LIMITED
MTS Building
Hughenden Avenue
High Wycombe
Bucks HP13 5FT
Telephone: [phone]
Fax: [phone]
Internet: http://www.mtsgb.ltd.uk
E-mail: inf[email protected]
Technical Service Hot Line: 0870 241 8180
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