EC-Eau Cylinder Range
Installation and User Instructions
Direct Electric and
Indirect Cylinders
Up to 300L
Important - This manual must be left with the user after Installation!
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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,
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
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:
For further information on the HWA Charter Membership, please refer to the
HWA website www.hotwater.org.uk’
efficiency and performance.
provided to the customer for future reference.
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
Overall View
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0 Overall View
Figure 1: Overall view of Direct Electric Cylinder Installation Process
Overall View
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Figure 2: Overall view of Indirect Cylinder Installation Process
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Contents
1 Contents
0 Overall View ...............................................................................................3
1 Contents ....................................................................................................5
2 Introduction ...............................................................................................7
3 Scope of delivery ........................................................................................7
4 Pre-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
5 Installation ............................................................................................... 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
6 Commissioning ......................................................................................... 23
7 Maintenance ............................................................................................. 24
8 Spare Parts .............................................................................................. 26
9 Technical Data and Product Fiche ................................................................ 27
9.1 Cylinder heat exchanger pressure drop ..................................................... 33
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Contents
10 User Instructions....................................................................................... 34
10.1 General ............................................................................................. 34
10.2 Operation .......................................................................................... 35
10.2.1 Water temperature direct electric heating ........................................... 35
10.2.2 Water temperature auxiliary heating .................................................. 36
10.3 Maintenance ....................................................................................... 36
10.4 Troubleshooting .................................................................................. 37
Scope of Delivery
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2 Introduction
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
3 Scope 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
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Scope of Delivery
* These items are supplied factory fitted
Table 3: Scope of Delivery for Indirect Cylinders
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Pre-Installation
4 Pre-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
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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
- 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:
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.
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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 descaling. 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.
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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
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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.
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- 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 crosslinked 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.
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