Important - This Manual Must Be Left With The User After
Installation!
EC-Eau Cylinder Range
Installation and User Instructions
A Class Heat Pump Cylinders
Up to 250L
A Class HP Installation a
nd User Instructions R02583
-6 09/15
Page
2
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’
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.
Overall View
A Class HP Installation a
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-6 09/15
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0 Overall View
Figure 1: Overall View of A Class Heat Pump Cylinder Installation Process
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Overall View
A Class HP Installation a
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Figure 2: Overall View of Solar A Class Heat Pump Cylinder Installation Process
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Contents
A Class HP Installation a
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1 Contents
0 Overall View ............................................................................................................. 3
1 Contents ................................................................................................................... 5
2 Introduction ............................................................................................................. 8
3 Scope of Delivery ..................................................................................................... 8
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 ..................................................... 10
4.4.1 Discharge Pipe D2 ........................................................................................ 10
4.4.2 Worked Example .......................................................................................... 12
4.4.3 Termination of Discharge Pipe ....................................................................... 12
4.5 Limitations ........................................................................................................ 12
5 Installation ............................................................................................................ 13
5.1 Cold Water Inlet with Inlet Control Group .............................................................. 13
5.1.1 Correctly Site the Cylinder ............................................................................ 13
5.1.2 Install the Inlet Group .................................................................................. 13
5.1.3 Expansion Vessel ......................................................................................... 13
5.1.4 Balanced Cold Water Supply .......................................................................... 13
5.1.5 Drain Valve ................................................................................................. 13
5.2 Hot Water Outlet ................................................................................................ 14
5.2.1 Thermostatic Mixing Valve ............................................................................ 14
5.2.2 Pipe Insulation ............................................................................................ 14
5.3 Discharge Pipes from Safety Devices ..................................................................... 14
5.3.1 Discharge Pipe D1 ........................................................................................ 14
5.3.2 Discharge Pipe D2 ........................................................................................ 14
5.3.3 Tundish ...................................................................................................... 14
5.4 HP Flow to Buffer Connection ............................................................................... 14
5.5 Buffer Flow to HP Connection ............................................................................... 14
5.6 Coil Return Connections ...................................................................................... 15
5.7 Coil Flow Connections ......................................................................................... 15
5.8.1 Solar Sensor Connection ............................................................................... 17
5.9 Water Module Wiring ........................................................................................... 20
5.9.1 Primary Electrical Connections ....................................................................... 20
5.9.2 Modbus Connection ...................................................................................... 21
5.9.3 Zone Connections ........................................................................................ 21
5.9.4 Digital Inputs & Temperature Sensors ............................................................ 22
5.9.5 Solar High Limit Stat Wiring .......................................................................... 23
5.10 Bivalent System ................................................................................................. 24
5.11 Connection of Secondary Return ........................................................................... 24
6 Commissioning ....................................................................................................... 25
Contents
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7 Maintenance ........................................................................................................... 26
8 Spare Parts ............................................................................................................ 27
9 Technical Data and Product Fiche ........................................................................... 28
9.1 A Class Heat Pump Buffer Range .......................................................................... 28
9.2 Heat Pump Buffer Solar Thermal Range ................................................................. 31
9.3 Cylinder Heat Exchanger Pressure Drop ................................................................. 34
9.4 Cylinder Attainable Temperature .......................................................................... 35
10 User Instructions................................................................................................ 35
10.1 General ............................................................................................................. 35
10.2 Operation .......................................................................................................... 35
10.3 Water Temperature Direct Electric Heating ............................................................ 35
10.4 Maintenance ...................................................................................................... 36
10.5 Troubleshooting ................................................................................................. 36
Scope of Delivery
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Precaution: This appliance can be
used by children aged from 8 years and
above and persons with reduced
physical, sensory or mental capabilities
or lack of experience and knowledge if
they have been given supervision or
instruction concerning use of the
appliance in a safe way and
understanding the hazards involved.
Children shall not play with the
appliance. Cleaning and user
maintenance shall not be made by
children without supervision.
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!
It is important to check the pre-
charge pressure of the expansion
vessel membrane before filling the
cylinder. This has been factory set
to 3 bar. The pre-charge should be
greater than or equal to 3 bar.
It is important that the tundish is
positioned away from any
electrical components.
Note: Means for electrical
disconnection must be incorporated
in the fixed wiring in accordance
with the wiring rules.
Before removing the cover from
the immersion heater isolate
appliance using isolating switch!
Danger of electrical shock! Only
use suitable electrically insulated
equipment when working inside
immersion housing.
The maintenance of this
appliance must be carried out by
a suitably qualified person only.
It is recommended to maintain
the unit on an annual basis.
Isolate all electrical supplies
from the unit before
commencing work. Danger of
electrical shock!
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.
Temperature setting: A high level
cutout is fitted to the product for
each heat source. This should never
activate under normal operation.
The maximum possible cylinder
temperature attainable by the heat
pump is 65°C as set on the User
Interface. The back-up immersion
heater can produce up to 72°C at
its maximum setting, i.e. 5. For
convenience the immersion heater
is preset to produce 60°C.
If an electronic copy of this manual
should be required, please contact the
manufacturer at the address at the
back of this manual.
Scope of Delivery
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2 Introduction
Thank you for choosing a Dimplex
product. The EC-Eau heat pump
cylinders are specified with large, high
surface area heat exchangers,
specifically sized to match the
requirements of Dimplex “A” Class Heat
Pumps. 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.
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.
For more detailed information on product
features, please see the Technical Data
section in this manual.
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.
Table 1: Scope of Delivery for A Class Heat Pump Cylinders
* These items are supplied factory fitted
** Supplied with Dimplex heat pump hydraulic pack
Pre-Installation
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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 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
frost protection
The heat pump cylinder range is 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.
Pre-Installation
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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.
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.
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 2 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).
Pre-Installation
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Figure 3: Typical Discharge Pipe Arrangement
Table 2: Sizing of Copper Discharge Pipe “D2” for Common Temperature Relief Valve Outlet Sizes
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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 2, 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.
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.
4.5 Limitations
The heat pump must be specified correctly,
to ensure it is compatible with the model of
cylinder installed. This is to prevent the
heat pump malfunctioning when preparing
domestic hot water.
The heat exchangers in this range of
cylinders have been specifically designed
for heat pump applications. Great care
must be taken if using these cylinders with
other heat sources, due to the heat
exchange capacity of the product.
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5 Installation
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. Isolating
device/s must not be fitted between the water
cylinder, the expansion vessel 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. This
has been factory set to 3 bar. The pre-
charge should be greater than or equal to
3bar.
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.
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
(recommended) 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
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.
Expansion
Vessel
Connection
Balanced
Cold Water
Supply
Expansion
Relief
Valve
Cold
Water to
Cylinder
Cold
Water
from
Mains
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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 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.
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.
5.4 HP Flow to Buffer Connection
The cylinder buffer flow connection must be
connected to the three port valve, connection B.
See Figure 6.
5.5 Buffer Flow to HP Connection
The cylinder buffer flow to HP connection must
be connected in series with the heat emitter
system/under floor heating.
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5.6 Coil Return Connections
If the return connection is the lowest point in
the heat pump loop, a suitable drain device
should be installed. For location of connections
see Figure 1 and see Figure 2 for solar cylinder
connections.
It is recommended that the fittings used to
connect to the cylinder are suitable for stainless
steel, the flow and return should use 28mm
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.
For ease of maintenance it is recommended to
install a drain valve (supplied) at the return
connection of the solar coil. Compression
fittings should be used to complete this part of
the installation.
Note: If the cylinder is located higher than
the solar collector array, a two port valve
has to be installed and wired accordingly.
5.7 Coil Flow Connections
If the flow connection is the highest point in the
heat pump loop and if the system was not
commissioned using a flush and fill pump, an
adequate device for de-aeration must be
installed. The coil flow connection must be
connected to the A connection of the three port
valve. See Figure 6.
Note: Special care is required when fitting
the 3 port valve to ensure “A” goes to the
DHW coil and that “B” goes to the buffer.
This is different to the normal convention
that may be used.
Figure 6: Diagram Showing Positions of Valve
Legend:-
A = HP Flow
B = HP Flow to Buffer
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Figure 7: Wiring Configuration of Space Heating and Hot Water - Dimplex "A Class" Cylinder
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5.8.1 Solar Sensor Connection
5.8.1.1 Solar Sensor Connection Thermostat Housing
Step 1: Access the sensor mounting plate. To do this remove the hood (A) by removing the fixing
screws at the top and bottom sides.
Step 2: Remove the insulation foam (B) to access the sensor mounting plate (C) and remove the M5
fixing screws in the four corners of the plate, when mounting sensor T2. If a T3 sensor is required,
remove the relay and bracket assembly first and then repeat steps for mounting sensor T2.
A
B
C
Position to mount sensor T3
Position to mount sensor T2
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Step 3: Orientate the sensor mounting plate to allow access to the phials (four clips in the centre of
the sensor mounting plate). Be careful not to kink the capillaries that connect the thermostat bulbs.
The sensor mounting plate will have two vacant slots for additional sensors (D). Slide the solar sensor
into place as shown (E). Repeat for both positions.
Step 4: Move the sensor mounting plate back into its fixing position. Be careful not to kink the
capillaries that connect the thermostat bulbs. Fit the four M5 fixing screws into the cylinder bracket (F).
Tighten the screws until the thermostat bulbs and heat pump sensor are held firmly against the wall of
the inner cylinder. Repeat for both positions. The solar high limit stat is also accessible at this location.
Figure 12 illustrates how the connections should be made.
Note: there should be no movement in the phials that are used to hold the bulbs and sensor. Care
should be taken not to overtighten the screws.
D
E
F
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Step 4: Replace the insulating foam over the sensor mounting plate.
Step 5: Replace the relay assembly (as required) and then refit the hood.
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5.9 Water Module Wiring
All wiring must be carried out by a suitably
qualified person and must be fully compliant
with the current release of Building & Wiring
Regulations. For general wiring configuration
see Figure 7.
The water module has been pre-wired to ensure
minimal additional work is required by the
installer. The following summarises the required
electrical connections which the installer must
make:
Primary connections, 5.9.1. A three core
cable must be connected between the
supply isolator and the cylinder connector
block. See Figure 8.
Modbus connection, 5.9.2. The
communication cable between the cylinder
and heat pump must be installed. See
Figure 9.
Zoned connections must be wired via the
cylinder PCB, i.e. circulation pumps and/or
zone valves, 5.9.3. See Figure 10.
Temperature sensors and digital inputs can
be connected to the PCB, 5.9.4 (DI 01-05),
(NTC-DHW and NTC-Zone 1-4). See Figure
11.
5.9.1 Primary Electrical Connections
In both retro fit and new build installations, a 3
core cable must be taken from the isolator
[typically a 16Amp double pole fused spur] and
connected to the primary connector block as
illustrated in Figure 8.
Live connection taken from a fused spur to
the cylinder connector block, [LHS grey
terminal].
Neutral and Earth wires must be connected
to the blue and green/yellow connectors
respectively, as per Figure 8.
Note: Solid core cable or ferruled multi
core cable must be used on the primary
connector block.
Figure 8: Primary Electrical Connections, Live, Neutral & Earth
Installation
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5.9.2 Modbus Connection
Correct installation of the Modbus connections
is critical for communication between the heat
pump, UI and the cylinder. Figure 9 illustrates
how these connections must be made. The
modbus wire must be specified to BELDEN 9842.
The maximum allowable network length is
100m.
Modbus in connection comes from the heat
pump master controller.
Modbus out connection goes to the user
interface.
The earth shield of the Modbus connection
must be connected to ground at both ends.
The Earth connector block or the cylinder
stat bracket can be used as a ground
connection.
The Modbus cables can be fed inside the
low voltage trunking (LHR) under the metal
hood and clamped to the strain relief bar,
using the supplied cable ties.
Note: The earth shield in the cable from
the heat pump to the cylinder is only
terminated at the cylinder.
Figure 9: Modbus Communication Connections
5.9.3 Zone Connections
For a dual zone system, i.e. DHW and CH, a
pump and a three port valve is required;
these are included in the scope of delivery
of the heat pump hydraulic pack.
Where additional zones are required, the
installer must specify and source suitable
components. Figure 10, illustrates wiring of
each pump and/or zone valve for up to 4
zones.
Note: The water module PCB is only
capable of switching valves and under no
circumstances should ERP pumps be
switched, as irreparable damage will be
caused that will void the warranty.
Installation
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Figure 10: Zone Connection
5.9.4 Digital Inputs & Temperature
Sensors
The water module contains 5 optional digital
inputs, 4 optional NTC zone temperature sensor
inputs and 1 domestic hot water (DHW) NTC
sensor.
• DHW NTC is pre-wired and fitted to the
cylinder. This sensor allows the user
interface to display the actual cylinder
temperature.
• NTC zone sensors allow the user interface
to display room temperature in up to 4
different zones and actuate the
corresponding controls accordingly.
• Digital input 1 is a spare connection.
• Digital input 2 is pre-wired and
enables/inhibits remote control.
• Digital inputs 3, 4 & 5 accept room
thermostat connections (volt free) that can
be used to control ambient temperature at
each zone.
Note: The DI’s are volt free and under no
circumstances should 240V be connected
to these, as irreparable damage would
result and void the warranty.
Installation
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Figure 11: Digital Inputs & Temperature Sensors
5.9.5 Solar High Limit Stat Wiring
The DHW cylinder solar zone valve/circulation
pump must be wired through the cylinder high
limit stat as illustrated in Figure 12. (Applicable
to ECS250HPST40A-580 only).
Figure 12: Solar High Limit Stat Wiring
Live
To
Solar
Circulation
Pump/Valve
Installation
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5.10 Bivalent System
Bivalent system operation can be achieved by
disconnecting the buffer cylinder live connection
[A] and connecting the backup heat source.
5.11 Connection of Secondary Return
For cylinders that do not have a dedicated
secondary return connection, it is possible to
install a secondary return by connecting a
swept - T to the cold water inlet of the cylinder
(see
Figure 13).
The secondary return pipe should incorporate a
check valve and a WRAS approved circulation
pump; timer and thermostat to be provided
separately. Where secondary return circuits are
used, then an additional expansion vessel may
be required.
The secondary return loop must avoid
- stagnant water in long pipe runs
- long waiting times at draw off point for hot
water
- undue water wastage
To minimise the energy consumption of the
secondary return circuit and to ensure reliable
operation it is important to consider:
- the control of the circulation pump to be time
and temperature controlled
Figure 13: Secondary return loop
HW Outlet
To Taps
Swept-T
From Taps
Commissioning
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6 Commissioning
At the time of commissioning, complete all
relevant sections of the Benchmark Checklist
located on the inside back pages of this
document.
The following commissioning procedures only
detail the required steps to be taken for the
potable water loop and not for the heat pump
loop:
1) Before making any water mains connections
to the inlet control group, flush the mains
pipework out to ensure all debris has been
removed so as not to damage the strainer
within the combination valve.
2) Make final mains connection on combination
valve and check all connections and joints to
ensure they have been tightened and
secured correctly.
3) Before turning on the mains supply to the
cylinder a hot water tap should be opened,
preferably on the same floor or the floor
below where the cylinder is located.
4) Check the pre-charge in the expansion
vessel and ensure it is at least 3 bar. Note
actual pressure on label on expansion vessel.
5) Turn on the supply to the cylinder and fill
until water runs from the open hot water
tap. Continue to flush the system until all
debris has been removed.
6) Close the hot water tap.
7) Check all joints for leaks, even those not
having been altered especially when
replacing a vented cylinder.
8) Open temperature and pressure relief valve
to ensure proper discharge and check after
closing that valve is not dripping.
9) Open expansion relief valve to ensure
proper discharge and check after closing
that valve is not dripping.
10) Check all shower outlets, toilet cisterns
and other draw off points for leaks or
dripping (especially when replacing a
vented unit). Open all water outlets to
purge air from pipe work and ensure
proper operation.
11) Adjust timer programmer and cylinder
thermostat settings in accordance with
client requirements.
12) Follow the instructions for commissioning
the heat pump as per heat pump
installation manual.
13) Commission the user interface as per UI
installation manual.
14) Instruct user in the operation of the
cylinder, heat pump and UI. Hand over all
manuals and advise the owner of annual
service requirements.
15) Complete the technical data label on the
cylinder with legible and permanent
writing.
Maintenance
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7 Maintenance
After servicing, complete the relevant Service
Record section of the Benchmark Checklist
located on the inside back pages of this
document. To meet with warranty requirements
the cylinder must be serviced annually.
The maintenance of this appliance
must be carried out by a suitably
qualified person only. It is
recommended to maintain the unit
on an annual basis. Isolate all
electrical supplies from the unit
before commencing work. Danger of
electrical shock!
1) Draw some water from cold water tap and
retain in container.
2) Isolate cold water mains supply from
cylinder.
3) Briefly open temperature and pressure relief
valve, assure safe discharge and check that
valve is not dripping when closed.
4) Briefly open expansion relief valve, assure
safe discharge and check that valve is not
dripping when closed. The expansion relief
valve should be operated regularly to
remove lime deposits and to verify that it is
not blocked.
5) Open hot water tap and release remaining
pressure from unit.
6) If the system is drained completely for an
internal inspection, ensure the hot water tap
remains open, connect a hose to the drain
valve and ensure a safe discharge.
7) Note the set pressure of the pressure
reducing valve. Remove cartridge and clean
strainer in water provided in container. Re-
assemble pressure reducing valve ensuring
the correct pressure is set.
8) Periodically the immersion heaters should
be removed cleaned and the unit flushed
out. Check the O-ring seal for damage
and replace if necessary. A torque of 40
Nm is recommended when tightening up
the immersion after it has been removed
and refitted.
9) Check electrical wiring connections and
the condition of the cable of the
immersion heater, the thermostat and the
connections on the relays.
10) The immersion heater boss can also be
used for access to view the internal
components of the cylinder.
11) Re-commission unit (see chapter 6).
If the cylinder is not in use for excess of 1
cneillmonth, it must be drained down by a
competent person and recommissioned
before use.
Note: The immersion must be switched off
at the mains before draining the cylinder.
If replacement parts are required, please
see Figure 14 for part descriptions and
part numbers.
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.
Waste electrical products should not
be disposed of with household waste.
Please recycle where facilities exist.
Check with your Local Authority or
retailer for recycling advice.
Spare Parts
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8 Spare Parts
Figure 14: Replacement Part Numbers for Heat Pump Range of Cylinders
Technical Data
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9 Technical Data and Product Fiche
9.1 A Class Heat Pump Buffer Range
Figure 15: A Class Heat Pump Cylinder and Cross-Section (For Reference Only)
Technical Data
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A Class Heat Pump Cylinder Range - Dimensions
Reference
150
210
250
Weight [kg]
42
50
62
Weight full [kg]
226
295
344
Reheat time [mins]*
8
13
18
Average draw off temperature [°C]*
58
58
60
Hot water draw off capacity (l)* / draw off flow
rate (l/s)
125
193
246
0.42
0.42
0.42
Heat loss [kWh]*
1.31
1.53
1.79
Height [mm]
1380
1765
2025
Outer Diameter [mm]
580
580
580
HW Outlet [mm]
1150
1525
1800
T&P Valve [mm]
1150
1525
1800
Secondary Return [mm]
-
-
-
CW Inlet [mm]
440
440
440
HP Buffer Flow/HP Flow to Buffer[mm]
180
180
180
HP Buffer Flow/Buffer Flow to HP [mm]
312
312
312
HP Return/DHW Return [mm]
440
440
440
HP Flow/DHW Flow [mm]
960
960
960
Table 3: A Class Heat Pump Cylinder Dimensions
Note: All measurements are taken from the base of the cylinder to the mid-point on the item.
* Determined in accordance with EN12897 test procedures.
A Class Heat Pump Cylinder Range – Product Fiche
Reference
ECS150HP40A-580
ECS210HP40A-580
ECS250HP40A-580
Energy Rating
B
B
B
Standing Loss [W]
54
59
66
Storage Volume [L]
144
205
247
Table 4: A Class Heat Pump Cylinder Product Fiche
Technical Data
A Class HP
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A Class Heat Pump Cylinder Range – Product Features
Actual capacity [L]
144 + 40
180 + 40
207+40
247 + 40
Materials
- inner cylinder
Duplex stainless steel LDX2101
- outer cylinder
HIPS
- inlet/outlet
Stainless steel
- coils
Stainless steel
- insulation
60mm PU foam (GWP=1, ODP=0)
Maximum operating conditions
- potable water temperature
70°C
- heating water temperature
95°C
- operating pressure
3 bar
- max. design pressure
6 bar
Cold water supply
- minimum dynamic pressure
1.5 bar
- maximum static pressure
12 bar
- minimum flow rate
15 l/min
Connections
- cold water inlet
22mm stainless steel
- hot water outlet
22mm stainless steel
- coil flow and return
28mm stainless steel
Coil specification
- heat pump coil surface area [m²]
2.2
- HX performance heat pump coil [kW]
46
43
42
- max. working pres. [Bar]
3
Immersion heater
1 ¾ F BSP 3kW @ 240 V
Thermostatic control
- direct input
Rod stat with variable and high limit cut out
- indirect input
Rod stat with variable and high limit cut out
Safety components
- pressure reducing valve and strainer
3 bar
- expansion relief valve
6 bar
- temperature and pressure relief valve
½” 7 bar/90°C
- factory pressure test
12 bar
Other features
Over 60% in volume from recycled materials#
Surface mounted sensor devices for compatibility and
ease of maintenance
Guarantee (*)
- inner cylinder
25 yrs.
- immersion heaters
2 yrs. - excluding the effects of lime scale or
other water borne contaminants
- other components
2 yrs. - excluding expansion vessel membrane pressure
Table 5: A Class Heat Pump Cylinder Product Fiche and Features
# Not including insulation
(*) subject to terms and conditions
Technical Data
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9.2 Heat Pump Buffer Solar Thermal Range
Figure 16: A Class Solar Heat Pump Cylinder and Cross-Section (For Reference Only)
Technical Data
A Class HP
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A Class Solar Heat Pump Cylinder Range - Dimensions
Reference
250 HP coil
250 Solar coil
Weight [kg]
66.5
Weight full [kg]
349
Reheat time [mins]*
7.4
29
Average draw off temperature [°C]*
57
59
Hot water draw off capacity (l)* / draw off flow
rate (l/s)
120
242
0.42
0.25
Heat loss [kWh/24h]*
1.79
Height [mm]
2025
Outer Diameter [mm]
580
HW Outlet [mm]
1800
T&P Valve [mm]
1800
Secondary Return [mm]
-
CW Inlet [mm]
440
HP Buffer Flow/HP Flow to Buffer[mm] 180
180
HP Buffer Flow/Buffer Flow to HP [mm]
312
Solar Return [mm]
440
Solar Flow [mm]
772
HP Return/DHW Return [mm]
1147
HP Flow/DHW Flow [mm]
1667
Table 6: A Class Solar Heat Pump Cylinder Dimensions
Note: All measurements are taken from the base of the cylinder to the mid-point on the item.
* Determined in accordance with EN12897 test procedures.
A Class Heat Pump Cylinder Range – Product Fiche
Reference
ECS250HPST40A-580
Energy Rating
B
Standing Loss [W]
66
Storage Volume [L]
242
Table 7: A Class Solar Heat Pump Cylinder Dimensions
Technical Data
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A Class Solar Heat Pump Cylinder Range – Product Features
Aux. hot water capacity [L]
120
Dedicated solar storage vol. [L]
123
Solar coil volume [L]
2.5
Materials
- inner cylinder
Duplex stainless steel LDX2101
- outer cylinder
HIPS
- inlet/outlet
Stainless steel
- coils
Stainless steel
- insulation
60mm PU foam (GWP=1, ODP=0)
Maximum operating conditions
- potable water temperature
70°C
- heating water temperature
95°C
- operating pressure
3 bar
- max. design pressure
6 bar
Cold water supply
- minimum dynamic pressure
1.5 bar
- maximum static pressure
12 bar
- minimum flow rate
15 l/min
Connections
- cold water inlet
22mm stainless steel
- hot water outlet
22mm stainless steel
- solar coil flow and return
22mm stainless steel
- heat pump coil flow and return
28mm stainless steel
Coil specification
- heat pump coil surface area [m²]
2.2
- solar coil flow surface area [m²]
1.1
- HX performance heat pump coil [kW]
48
51
47
47
47
43
- HX performance solar coil [kW]
26
- max. working pres. [Bar]
3
Immersion heater
1 ¾ F BSP 3kW @ 240 V
Thermostatic control
- direct input
Rod stat with variable and high limit cut out
- indirect input
Rod stat with variable and high limit cut out
Safety components
- pressure reducing valve and strainer
3 bar
- expansion relief valve
6 bar
- temperature and pressure relief valve
½” 7 bar/90°C
- factory pressure test
12 bar
Other features
Over 60% in volume from recycled materials#
Surface mounted sensor devices for compatibility
and ease of maintenance
Guarantee (*)
- inner cylinder
25 yrs.
- immersion heaters
2 yrs. - excluding the effects of lime scale or
other water borne contaminants
- other components
2 yrs. - excluding expansion vessel membrane pressure
Table 8: A Class Heat Pump Cylinder Product Fiche and Features
# Not including insulation
Technical Data
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9.3 Cylinder Heat Exchanger Pressure Drop
Figure 17: Heat Exchanger Pressure Drop for 1.1m² and 2.2m² Coils
0
20000
40000
60000
80000
100000
120000
140000
0 0.5 1 1.5 2 2.5 3
Pressure Differential (Pa)
Flow Rate (m
3
/h)
1.1 m² Coil Pressure Drop
0
2000
4000
6000
8000
10000
12000
14000
0.0 0.5 1.0 1.5 2.0 2.5
Pressure Drop (Pa)
Flow Rate (m
3
/h)
2.2 m
2
Coil Pressure Drop
Troubleshooting
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9.4 Cylinder Attainable Temperature
The heat pump heating system must be
commissioned by a trained installer. Ensuring
correct installation of the system will allow a
water temperature of 60°C to be obtained
inside the cylinder during DHW preparation.
This is true for all cases when ambient
conditions are between -2°C and +25°C. For
other operating conditions, i.e. -2°C < ambient
> 25°C, cylinder temperatures of approximately
55°C can be expected.
The A Class heat pump will be able to achieve
60°C without immersion back up in all of the A
Class cylinders, so long as the flow rate
specified in the instructions is met, the pipes
are insulated and the pipe runs from the heat
pump to the cylinder and back are less than
15m.
10 User Instructions
10.1 General
“This appliance can be used by children
aged from 8 years and above and
persons with reduced physical, sensory
or mental capabilities or lack of
experience and knowledge if they have
been given supervision or instruction
concerning use of the appliance in a
safe way and understand the hazards
involved. Children shall not play with
the appliance. Cleaning and user
maintenance shall not be made by
children without supervision.”
Please read the following statements
carefully as it affects your warranty:
Please ensure that the installer has fully
completed the Benchmark Checklist on the
inside back pages of this document and that
you have signed it to say that you have
received a full and clear explanation of its
operation. The installer is legally required to
complete a commissioning checklist as a means
of complying with the appropriate Building
Regulations Part G3 (England and Wales), Part
P of Northern Ireland and Section 6 of Scotland.
All installations must be notified to Local Area
Building Control either directly or through a
Competent Persons Scheme. A Building
Regulations Compliance Certificate will then be
issued to the customer who should, on receipt,
write the Notification Number on the
Benchmark Checklist.
This product should be serviced annually to
optimise its safety, efficiency and performance.
The service engineer should complete the
relevant Service Record on the Benchmark
Checklist after each service.
The Benchmark Checklist will be required in the
event of any warranty work.
10.2 Operation
Once the system has been fully commissioned,
no user intervention should be required to fully
enjoy the comfort and benefits of the unvented
hot water cylinder.
The hot water temperature can be set to
various requirements.
When turning on a hot tap for the first time
after a heat up period there might be a short
surge of water. This is normal in unvented
systems and does not constitute a fault.
Sometimes the water may appear milky – this
is due to very fine air bubbles in the water
which will clear quickly.
10.3 Water Temperature Direct Electric
Heating
The heat pump should be used for production of
DHW. However, if the desired water
temperature is not achieved the immersion
heater will activate.
Before removing the cover from the
immersion heater isolate appliance using
isolating switch! Danger of electrical
shock! Only use suitable electrically
insulated equipment when working inside
immersion housing.
The hot water temperature achieved by the
direct electric heating element can be adjusted
by removing the cover from the immersion
heater and adjusting the dial up or down as
indicated in Figure 18.
Troubleshooting
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Figure 18: Adjustment Water Temperature Direct
Electric Heating Element
10.4 Maintenance
The maintenance of this appliance
must be carried out by a suitably
qualified person only. It is
recommended to maintain the unit on
an annual basis. Isolate all electrical
supplies from the unit before
commencing work. Danger of
electrical shock! See Section 7.
10.5 Troubleshooting
Fault
Cause
Solution
A No water from
hot water taps
A.1 Stop valve closed
A.2 Strainer blocked
A.3 Pressure reducing valve
fitted against flow
A.1 Open stop valve
A.2 Turn water supply off,
clean strainer and re-
commission
A.3 Re-fit with arrow showing
in direction of flow
B No hot water
B.1 Timer/Programmer not set
correctly
B.2 Auxiliary heating
malfunction
B.3 Direct heating malfunction
B.4 Auxiliary/direct heating
high limit thermostat has
tripped
B.1 Set timer/programmer
correctly
B.2 Consult auxiliary heating
system instructions
B.3 Call for qualified person to
check immersion heater
B.4 Reset limit thermostat(s)
and inform installer
C Intermittent
water
discharge
through
tundish on
warm-up
C.1 Expansion vessel lost
charge
C.1 Check expansion vessel
(see commissioning /
maintenance, top up or
replace
D Continuous
discharge
D.1 Pressure reducing valve not
working
D.2 Pressure relief or T&P valve
not seating correctly
D.3 Malfunction of high limit
thermostat or appliance
D.1 Check pressure after
valve and replace if faulty
D.2 Manually lift valve once or
twice to clear debris,
otherwise replace
D.3 Check function of
thermostats and
appliances
E Leakage from
casing
E.1Compression/threaded
joints not formed correctly
E.1 Re-seal joints with care
F Hot water from
cold tap
F.1 Hot pipe work being routed
adjacent to cold pipe work
F.2 Leaking seal in mixer tap
F.1 Insulate hot pipe work or
re-route
F.2 Replace seals in mixer tap
G Metallic noise
from system
G.1 Pipe work not sufficiently
supported
G.1 Add extra pipe work
fixings
H Humming noise
from system
during re-heat
H.1 Air in system
H.2 Flow rate well in excess of
specification
H.1 Bleed system thoroughly
and re-pressurize
H.2 Reduce pump speed
Table 9: Troubleshooting Guide
Dial to adjust
water temperature
Wiring
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Figure 19: A Class Cylinder Wiring Overall View
Wiring
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Figure 20: A Class Installer Wiring Overall View
Notes
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Notes
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Notes
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