Dimplex ECSd125-580 Guide

Important - This manual must be left with the user after Installation!
EC-Eau Cylinder Range
Installation and User Instructions
Direct Electric and
Indirect Cylinders
Up to 300L

Installation and User Instructions R01127-10 01/16 Page 2
Dimplex is a licensed member of the Benchmark Scheme which aims to improve
the standards of installation and commissioning of domestic heating and hot
water systems in the UK and to encourage regular servicing to optimise safety,
efficiency and performance.
Benchmark places responsibilities on both manufacturers and installers. The
purpose is to ensure that customers are provided with the correct equipment for
their needs, that it is installed, commissioned and serviced in accordance with
the manufacturer’s instructions by competent persons and that it meets the
requirements of the appropriate Building Regulations. The Benchmark Checklist
can be used to demonstrate compliance with Building Regulations and should be
provided to the customer for future reference.
Installers are required to carry out installation, commissioning and servicing work
in accordance with the Benchmark Code of Practice which is available from the
Heating and Hot Water Industry Council who manage and promote the Scheme.
Visit www.centralheating.co.uk for more information.
The HWA Charter requires that all members adhere to the following:
supply fit for purpose products clearly and honestly described
supply products that meet, or exceed appropriate standards and
building and water regulations
provide pre and post sales technical support
provide clear and concise warranty details to customers
For further information on the HWA Charter Membership, please refer to the
HWA website www.hotwater.org.uk’

Overall View
Installation and User Instructions R01127-10 01/16 Page 3
0Overall View
Figure 1: Overall view of Direct Electric Cylinder Installation Process
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Overall View
Installation and User Instructions R01127-10 01/16 Page 4
Figure 2: Overall view of Indirect Cylinder Installation Process
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Installation and User Instructions R01127-10 01/16 Page 5
Contents
1Contents
0Overall View ...............................................................................................3
1Contents ....................................................................................................5
2Introduction ...............................................................................................7
3Scope of delivery ........................................................................................7
4Pre-Installation Advice .................................................................................9
4.1 Risk assessment ......................................................................................9
4.2 Siting considerations ................................................................................9
4.3 Cold water supply ..................................................................................10
4.4 Building regulation G3 Discharge requirements ..........................................11
4.4.1 Discharge pipe D2............................................................................12
4.4.2 Worked example..............................................................................13
4.4.3 Termination of discharge pipe ...........................................................14
4.5 Limitations ............................................................................................15
5Installation...............................................................................................15
5.1 Cold Water Inlet with Inlet Control Group..................................................15
5.1.1 Correctly site the cylinder .................................................................15
5.1.2 Install the inlet group.......................................................................15
5.1.3 Expansion vessel .............................................................................15
5.1.4 Balanced cold water supply ...............................................................16
5.1.5 Drain valve .....................................................................................16
5.2 Hot Water Outlet....................................................................................16
5.2.1 Thermostatic mixing valve ................................................................16
5.2.2 Pipe insulation.................................................................................16
5.3 Discharge pipes from safety devices .........................................................16
5.3.1 Discharge pipe D1............................................................................16
5.3.2 Discharge pipe D2............................................................................17
5.3.3 Tundish ..........................................................................................17
5.4 Immersion heater ..................................................................................18
5.5 Coil flow connections (indirect models only) ..............................................18
5.6 Coil return connections (indirect models only) ...........................................18
5.7 Thermostat connection (indirect models only)............................................19
5.8 Connection of Secondary Return ..............................................................22
6Commissioning .........................................................................................23
7Maintenance .............................................................................................24
8Spare Parts ..............................................................................................26
9Technical Data and Product Fiche ................................................................27
9.1 Cylinder heat exchanger pressure drop .....................................................33

Installation and User Instructions R01127-10 01/16 Page 6
Contents
10 User Instructions.......................................................................................34
10.1 General .............................................................................................34
10.2 Operation ..........................................................................................35
10.2.1Water temperature direct electric heating ...........................................35
10.2.2Water temperature auxiliary heating ..................................................36
10.3 Maintenance.......................................................................................36
10.4 Troubleshooting..................................................................................37

Scope of Delivery
Installation and User Instructions R01127-10 01/16 Page 7
2Introduction
Thank you for choosing a Dimplex
product. The EC-Eau direct electric and
indirect cylinders are specified with
high quality, long-life immersion
heaters and large surface area coils for
fast reheat times. They boast 60mm of
low GWP insulation foam, together with
100% recyclable stainless steel inner
components and a sleek black, hard
wearing outer shell manufactured from
completely recycled materials. For
more detailed information on product
features, please see the Technical Data
section in this manual.
NOTE: This product has been designed
specifically for the purpose of
delivering heated, domestic and
sanitary hot water as part of a
pressurised water heating system. The
package is provided with fittings that
comply with Section G3 of Building
Regulations.
WARNING: Dimplex cannot take
responsibility for ensuring safe
operation of the appliance outside
of the scope of intended use.ly
3Scope of delivery
Please ensure you check the scope of
delivery below before signing any
delivery documentation. Claims for
missing or damaged parts after signing
for the delivery will not be accepted.
* These items are supplied factory
fitted
Table 1: Scope of Delivery for Direct
Electric Cylinders
Table 2: Scope of Delivery Direct Cylinders

Installation and User Instructions R01127-10 01/16 Page 8
Scope of Delivery
* These items are supplied factory fitted
Table 3: Scope of Delivery for Indirect Cylinders

Installation and User Instructions R01127-10 01/16 Page 9
Pre-Installation
4Pre-Installation
Advice
Please read the following section
carefully before commencing
installation. If in any doubt, please call
the appropriate help desk.
Disregarding the instructions given in
this manual in its entirety and any
relevant regulations, standards and
codes of practice will void the
guarantee of this product.
Handling –depending on the size of
the unit and access to its installation
location, consideration must be given
to the handling of the unit. Please note
that handling, installation and use of
this product is subject to the Health
and Safety at Work Act.
If the unit is not installed immediately,
it should remain in its protective
packaging with all pipe protectors/end
caps applied to prevent damage and
dirt deposit inside the cylinder and the
coils.
Pipe work –the pipe runs should be
executed as short as possible, unused
pipe work should be removed and all
remaining pipe work should be lagged
in accordance with regulatory
requirements to prevent heat loss and
the formation of condensation.
Taps and fittings –all taps and
fittings incorporated in the unvented
system should have a rated operating
pressure of 0.6 MPa (6 bar) or above.
4.1 Risk assessment
The compilation of a risk assessment is
strongly recommended before
installing the product. The following
areas require particular consideration
in addition to the information required
by the Health and Safety at Work Act.
- scalding: where appropriate or
required by law a thermostatic
mixing valve is to be fitted to the hot
water outlet of the cylinder (see also
water borne organisms).
- explosion: the unit is fully equipped
with all relevant safety equipment to
comply with current regulations. The
correct design and function has been
verified by independent third party
testing. The correct application
thereof is the responsibility of the
competent installer.
- water borne organisms (i.e.
Legionella): if applicable a risk
assessment should be carried out
following the recommendations
outlined in the Approved Code of
Practice L8.
- the user preference must be
considered when commissioning the
system, in particular when adjusting
the solar and auxiliary system
temperature and timer settings.
4.2 Siting considerations
When choosing a suitable location for
the cylinder the following aspects
should be considered:
- structural integrity
- access for installation, operation,
maintenance and replacement
- routing of discharge pipe work
- access to water mains supply, hot
and cold water distribution pipe work
- access to suitable electricity supply
- location in relation to remaining
system components such as
auxiliary and solar heating system

Installation and User Instructions R01127-10 01/16 Page 10
Pre-Installation
- frost protection
The direct electric and indirect cylinder
ranges are designed to be floor
standing, vertically mounted, indoors
and in a frost free environment. The
cylinder may be located on any flat and
level surface, provided it is sufficiently
robust to support the weight of the
cylinder when full of water (please see
technical data) and suitably accessible
for replacement/maintenance without
specialist tools or lifting equipment as
this will void the warranty conditions.
The position and orientation of the
cylinder should be such that easy
access is provided for servicing the
controls. A minimum distance of
400mm in front of the immersion is
recommended, to allow the
replacement of the immersion heater
should the need arise. When installing
the cylinder all labels should be clearly
visible and ensure that no pipework
hinders any work to be carried out on
the various cylinder components.
Particular care must be taken when
placing the cylinder in a garage or
outbuilding. All exposed pipe work
must be correctly insulated to avoid
frost damage.
CLEANING INSTRUCTIONS:
Clean outer cladding of
cylinder with a soft cloth
dampened with warm water
only. Do not use abrasive or
aggressive cleaning
materials, such as alcohol or
petroleum based solvents, as
this may damage the surface
of the product.
4.3 Cold water supply
For satisfactory and safe performance
of the unvented cylinder the water
supply must meet the following
criteria:
Minimum dynamic
pressure
150 kPa
(1.5 bar)
Maximum inlet supply
pressure
1200 kPa
(12 bar)
Minimum flow rate
15 l/min
Max. chlorine content
250mg/L
Max. water hardness
200mg/L
The following instructions have to be
followed when installing the cold water
mains supply to the cylinder:
- The cold water supply to the cylinder
must come directly from the cold
water mains after the mains stop
valve to the property.
- The cold water inlet pipe work should
have at least an inside diameter of
19mm and should meet the
requirements of the water
regulations for the supply of
wholesome water.

Installation and User Instructions R01127-10 01/16 Page 11
Pre-Installation
Dimplex recommend an annual
maintenance inspection is carried out
on the domestic hot water cylinder. In
hard water areas this should include
inspection of the heat exchanger and
immersion heater, [above 120ppm or
120mg/l]. A local water treatment
company should be able to offer free
water quality testing. The heating
elements may require periodic de-
scaling. The installer should do this as
part of a maintenance agreement.
If required, precautions can be taken
to minimise effects of water hardness,
i.e. installation of water conditioner or
water softener. These devices should
be installed in hard water areas where
high water storage temperatures are
required, i.e. greater than 60°C
storage temperatures, particularly
when water hardness exceeds
200ppm. Should the water cylinder
require de-scaling, this must be
performed by a qualified technician.
4.4 Building regulation G3
Discharge
requirements
As part of the requirements of Building
Regulation G3 any discharge from an
unvented system should be conveyed
to where it is visible, but will not cause
danger to persons in or about the
building. The tundish and the discharge
pipes should be fitted in accordance
with the requirements of Building
Regulation approved document G3,
(England and Wales), Part P of
Northern Ireland and Standard 4.9 of
Scotland.

Installation and User Instructions R01127-10 01/16 Page 12
Pre-Installation
4.4.1 Discharge pipe D2
The discharge pipe (D2) from the
Tundish should:
- “have a vertical section of pipe at
least 300mm long below the
tundish before any elbows or
bends in the pipework and be
installed with a continuous fall of
at least 1 in 200 thereafter.”
The discharge pipe (D2) should be
made of:
- “metal; or other material that has
been demonstrated to be capable
of safely withstanding
temperatures of the water
discharged and is clearly and
permanently marked to identify
the product and performance
standard”
Dimplex strongly recommends the use
of metal pipework only and Dimplex
does not take responsibility for any
damage caused from discharges.
The discharge pipe D2 should be at
least one pipe size larger than the
nominal outlet size of the safety device
unless its total equivalent hydraulic
resistance exceeds that of a straight
pipe 9m long, i.e. for discharge pipes
between 9m and 18m the equivalent
resistance length should be at least two
sizes larger than the nominal outlet
size of the safety device; between 18
and 27m at least 3 sizes larger, and so
on; bends must be taken into account
in calculating the flow resistance. See
Figure 3, Table 4 and the worked
example.
Note: An alternative approach for
sizing discharge pipes would be to
follow Annex D, section D.2 of BS
6700:2006 + A1:2009).
Figure 3: Typical discharge pipe arrangement

Installation and User Instructions R01127-10 01/16 Page 13
Pre-Installation
Table 4: Sizing of copper discharge pipe “D2” for common temperature relief valve outlet sizes
4.4.2 Worked example
This example is for a G½ temperature
relief valve with a discharge pipe (D2)
(as fitted on 125 to 300L cylinders)
having 4 No. 22mm elbows and length
of 7m from the tundish to the point of
discharge.
From Table 4, the maximum resistance
allowed for a straight length of 22mm
copper discharge pipe
(D2) from a G½ temperature relief
valve is 9.0m. Subtract the resistance
for 4 No. 22mm elbows at 0.8m each
= 3.2m.
Therefore the maximum permitted
length
equates to 5.8m, which is less than the
actual length of 7m, therefore calculate
the next largest size.
Maximum resistance allowed for a
straight length of 28mm copper
discharge pipe (D2) from a G½
temperature relief valve is: 18m
Subtract the resistance for 4 No. 28mm
elbows at 1.0m each = 4m
Therefore the maximum permitted
length equates to 14m.
As the actual length is 7m, a 28mm
(D2) copper pipe will be satisfactory.

Pre-Installation
Installation and User Instructions R01127-10 01/16 Page 14
- Where a single common discharge
pipe serves more than one system,
it should be at least one pipe size
larger than the largest individual
discharge pipe (D2) to be connected.
- The discharge pipe should not be
connected to a soil discharge stack
unless the soil discharge stack is
capable of safely withstanding
temperatures of the water
discharged, in which case, it should:
- contain a mechanical seal, which
allows water into the branch pipe
without allowing foul air from the
drain to be ventilated through the
tundish.
- there should be a separate branch
pipe with no sanitary appliances
connected to it.
- if plastic pipes are used as branch
pipes carrying discharge from a
safety device, they should be
either polybutalene (PB) or cross-
linked polyethylene (PE-X)
complying with national
standards.
- be continuously marked with a
warning that no sanitary
appliances should be connected to
the pipe.
4.4.3 Termination of
discharge pipe
- “The discharge pipe (D2) from the
tundish should terminate in a safe
place where there is no risk to
persons in the vicinity of the
discharge.”
- Examples of acceptable discharge
arrangements are:
- “to a trapped gully with the end of
the pipe below a fixed grating and
above the water seal;
- downward discharges at low level;
i.e. up to 100mm above external
surfaces such as car parks, hard
standings, grassed areas etc. are
acceptable providing that a wire
cage or similar guard is positioned to
prevent contact, whilst maintaining
visibility; and ,
- discharges at high level: e.g. into a
metal hopper and metal downpipe
with the end of the discharge pipe
clearly visible or onto a roof capable
of withstanding high temperature
discharges of water and 3m from any
plastic guttering system that would
collect such discharges.”
Note: As the discharge would
consist of high temperature water
and steam, asphalt, roofing felt
and non-metallic rainwater goods
may be damaged by such
discharges.

Installation and User Instructions R01127-10 01/16 Page 15
Installation
4.5 Limitations
Due to the operating temperatures of
direct electric water heaters the water
hardness can considerably influence
the longevity of the immersion heater
element. Please consult local water
board for advice on maintenance
intervals.
5Installation
5.1 Cold Water Inlet with
Inlet Control Group
5.1.1 Correctly site the
cylinder
Install the cylinder in an appropriate
location, ensuring all of the
recommendations have been
considered (see chapter 4.2).
5.1.2 Install the inlet group
The inlet group regulates the pressure
of the incoming mains water supply to
the cylinder and removes any debris
that might be water borne.
Note: Between the inlet group and
the cold water inlet on the cylinder
NO isolating device may be fitted,
as by doing so important safety
devices could be isolated!
5.1.3 Expansion vessel
The expansion vessel is mandatory on
all EC-Eau cylinders and can be
connected directly to the cold water
inlet group, utilising the flexible hose
supplied with the vessel. The
expansion vessel should always be
fitted in accordance with the
manufacturer’s instructions. No
isolating device must be fitted between
the water cylinder and the cold water
inlet group.
Furthermore, it is recommended to
mount the vessel higher than the
cylinder to avoid having to drain the
cylinder when maintaining and
replacing the expansion vessel.
Figure 4: Connection of the expansion
vessel to the inlet group
It is important to check the
pre-charge pressure of the
expansion vessel membrane
before filling the cylinder. The
pre-charge should be greater
than or equal to 3 bar.
Note: The expansion vessel must
be installed to the side of the
expansion relief valve on the inlet
group. To do this the blanking plug
must be removed and the
expansion vessel connected, as
shown in Figure 5.

Installation and User Instructions R01127-10 01/16 Page 16
Installation
Figure 5: Detail showing the connection of
the expansion vessel to the inlet group
5.1.4 Balanced cold water
supply
If a balanced cold water supply is
required a connection can be taken
from the bottom of the inlet group.
5.1.5 Drain valve
It is also recommended to install a
drain valve (not supplied) in the lowest
point of the cold water feed to the
cylinder. This allows the cylinder to be
drained in a controlled manner should
this become necessary.
5.2 Hot Water Outlet
The hot water pipe work is to be
directly connected to the hot water
outlet connection on the cylinder, see
Figure 1.
5.2.1 Thermostatic mixing
valve
A thermostatic mixing valve may be
required to limit the outlet
temperature. In this case, the valve
should be installed following the
manufacturer’s instructions, ensuring
none of the safety equipment has been
isolated, (i.e. make sure the
connection to the thermostatic mixing
valve is taken after the safety
equipment of the inlet group).
5.2.2 Pipe insulation
It is recommended to insulate the hot
water pipe work from the cylinder to
the outlets, to reduce the energy
requirements for providing hot water.
It is also recommended to insulate all
other exposed pipework, such as the
T&P to the tundish, the coil flow and
return and the cold water inlet pipes.
5.3 Discharge pipes from
safety devices
5.3.1 Discharge pipe D1
- The temperature and pressure relief
valve must be discharged directly or
by way of a manifold via a short
length of metal pipe (D1) into a
tundish; and the discharge pipe must
be installed in a continuously
downward direction and in a frost
free environment. Water may drip
from the discharge pipe of the
pressure relief device and this pipe
must be left open to the atmosphere.
- The diameter of discharge pipe (D1)
should not be less than the nominal
outlet size of the safety device, e.g.
temperature relief valve.
- Where a manifold is used it should be
sized to accept and discharge the
Expansion
Vessel
Connection
Balanced
Cold Water
Supply
Expansion
Relief
Valve
Cold
Water to
Cylinder
Cold
Water
from
Mains

Installation and User Instructions R01127-10 01/16 Page 17
Installation
total discharge from all the D1
discharge pipes connected to it.
- The discharge pipe work from the
expansion relief valve must be
installed constantly falling to an open
point of discharge. It is
recommended to combine it with the
discharge of the temperature and
pressure relief valve.
Note: The T&P valve is pre-sealed
and if moved the seal will be
broken, should this occur, it will
need to be resealed with an
appropriate sealant (Dimplex part
number R00836-1).
5.3.2 Discharge pipe D2
For a detailed description of the
discharge pipework D2 see chapter
4.4.1.
5.3.3 Tundish
- The tundish should be vertical,
located in the same space as the
unvented hot water storage system
and be fitted as close as possible to,
and lower than, the safety device,
with no more than 600mm of pipe
between the valve outlet and the
tundish (see Figure 3).
- Discharge should be visible at the
tundish, where discharges may not
be apparent, e.g. in dwellings
occupied by people with impaired
vision or mobility, consideration
should be given to the installation of
a suitable safety device to warn
when discharge takes place, e.g.
electronically operated.
Note: To comply with the Water
Supply (Water Fittings)
Regulations, the tundish should
incorporate a suitable air gap.
It is important that the tundish
is positioned away from any
electrical components.
Figure 6: Wiring diagram for Immersion Heater
-
+

Installation and User Instructions R01127-10 01/16 Page 18
Installation
5.4 Immersion heater
The immersion heater has to be
connected in accordance with IEE
Wiring Regulations and the installer
carrying out the work has to be suitably
qualified. It must be connected
through a double pole isolating switch
or suitable controller which must have
a contact separation of at least 3mm in
all poles. The wiring diagram can be
seen in Figure 6. For further details
please see instructions provided with
the immersion heater.
The immersion heater incorporates an
independent non-self resetting over
temperature cut-out. Should the over
temperature cut-out operate, the reset
pin will be pushed upwards, and
become level or slightly proud of the
cover at the position marked “Safety”.
Use a suitable sized implement to reset
the pin by pushing it hard into its
original position.
Note: Should it be necessary to
remove the thermostat from the
immersion element, ensure that
the contacts are re-fitted correctly
into the positions on the element.
Failure to do so carries the risk of
overheating the contacts and thus
damaging the appliance.
The immersion heater thermostat must
not be opened under any
circumstances.
Note: The cylinder must be filled
with water before switching on the
immersion heater. Failure to do so
will damage the element and void
any guarantee on the product.
5.5 Coil flow connections
(indirect models only)
If the flow connection is the highest
point in the indirect heating loop and if
the system was not commissioned
using a flush and fill pump, an
adequate device for de-aeration must
be installed.
5.6 Coil return
connections (indirect
models only)
If the return connection is the lowest
point in the indirect heating loop, a
suitable drain device should be
installed. For location of connections
see Figure 2.
It is recommended that the fittings
used to connect to the cylinder are
suitable for stainless steel, the flow and
return should use 22mm compression
fittings. Not all push fit fittings can be
used –please check with your supplier.
When using compression fittings,
ensure that the connection is not over-
tightened.

Installation and User Instructions R01127-10 01/16 Page 19
Installation
5.7 Thermostat
connection (indirect
models only)
The indirect heating source can be
connected to the cylinder in various
ways as described by the system
supplier. The wiring and installation
principles for two typical integration
methods are detailed in Figure 8 and
Figure 9.
To conform to building regulations, it is
imperative that any heat generator
connected to the cylinder is installed
through the correct twin thermostat,
which is factory fitted to the cylinder.
The two port valve supplied with the
indirect cylinder is to be installed by
default into the heating loop. For
access to the thermostat wiring see
Figure 7.
Figure 7: Thermostat Wiring Schematic
T1
T1
T2
T
NOTE: T1 and T2 must be connected. T3 can replace T2 only
when a normally open configuration is required.
To indirect pump/
two port valve
From control unit
Temp
control
stat
High
temp cut
out stat
2
1
1
2
3
T4
Earth
A
To access the wire connections of the Dual Cut Out, only component A has to be
removed.

Installation
Installation and User Instructions R01127-10 01/16 Page 20
Figure 8: Auxiliary loop wiring details - 2 x two port valves