Important - This manual must be left with the user after Installation!
EC-Eau Cylinder Range
Installation and User Instructions
Solar Direct, Solar Indirect and
Solar Heat Pump Cylinders
Up to 300L
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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,
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’
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Overall View
0 Overall View
Figure 1: Overall view of Solar Direct Cylinder Installation process
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Overall View
Figure 2: Overall view of Solar Indirect Cylinder Installation process
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Overall View
Figure 3: Overall view of Solar Heat Pump Cylinder Installation process
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Contents
1 Contents
0 OVERALL VIEW ...........................................................................................3
1 CONTENTS .................................................................................................6
2 INTRODUCTION ........................................................................................ 11
3 SCOPE OF DELIVERY ................................................................................. 12
4 PRE-INSTALLATION ADVICE ....................................................................... 15
4.1 RISK ASSESSMENT ..................................................................................... 15
4.2 SITING CONSIDERATIONS ............................................................................. 15
4.3 COLD WATER SUPPLY .................................................................................. 16
4.4 BUILDING REGULATION G3 DISCHARGE REQUIREMENTS ......................................... 17
4.4.1 Discharge pipe D2 ........................................................................ 18
4.4.2 Worked example .......................................................................... 19
4.4.3 Termination of discharge pipe ........................................................ 20
4.5 LIMITATIONS ............................................................................................ 21
5 INSTALLATION .......................................................................................... 21
5.1 COLD WATER INLET WITH INLET CONTROL GROUP ............................................... 21
5.1.1 Correctly site the cylinder .............................................................. 21
5.1.2 Install the inlet group .................................................................... 21
5.1.3 Expansion vessel .......................................................................... 21
5.1.4 Balanced cold water supply ............................................................ 22
5.1.5 Drain valve .................................................................................. 22
5.2 HOT WATER OUTLET .................................................................................. 22
5.2.1 Thermostatic mixing valve ............................................................. 22
5.2.2 Pipe insulation .............................................................................. 22
5.3 DISCHARGE PIPES FROM SAFETY DEVICES .......................................................... 22
5.3.1 Discharge pipe D1 ........................................................................ 22
5.3.2 Discharge pipe D2 ........................................................................ 23
5.3.3 Tundish ....................................................................................... 23
5.4 IMMERSION HEATER.................................................................................... 24
5.5 SOLAR COIL CONNECTIONS ........................................................................... 25
5.6 AUXILIARY COIL CONNECTIONS ...................................................................... 25
5.7 THERMOSTAT CONNECTION ........................................................................... 26
5.7.1 Auxiliary loop wiring schematic (indirect cylinder only) ...................... 27
5.7.2 Solar loop wiring schematic (direct and indirect cylinders) ................. 28
5.7.3 Solar sensor connection ................................................................. 29
5.8 CONNECTION OF SECONDARY RETURN .............................................................. 34
6 COMMISSIONING ...................................................................................... 35
7 MAINTENANCE .......................................................................................... 36
8 SPARE PARTS ........................................................................................... 38
9 TECHNICAL DATA AND PRODUCT FICHE ...................................................... 39
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Contents
9.1 CYLINDER HEAT EXCHANGER PRESSURE DROP ..................................................... 48
10 USER INSTRUCTIONS ................................................................................ 50
10.1 GENERAL ............................................................................................. 50
10.2 OPERATION .......................................................................................... 51
10.2.1 Water temperature direct electric heating ........................................ 51
10.2.2 Water temperature auxiliary heating ............................................... 52
10.3 MAINTENANCE ....................................................................................... 52
10.4 TROUBLESHOOTING ................................................................................. 53
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Important Information
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
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Important Information
when working inside
immersion housing.
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.
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
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Important Information
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.
Note: This appliance is
intended to be
permanently
connected to the water
mains and not
connected by a hose-
set.
Dimplex cannot take
responsibility for ensuring
safe operation of the
appliance outside of the
scope of intended use.ly
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Important Information
2 Introduction
Thank you for choosing a Dimplex
product. The EC-Eau solar cylinders are
specified with large, high surface area
heat exchangers, specifically sized to
match the requirements of Dimplex
solar systems. 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.
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Important Information
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 Solar Direct Cylinders
* These items are supplied factory fitted
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Scope of Delivery
Table 2: Scope of Delivery for Solar Indirect Cylinders
* These items are supplied factory fitted
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Scope of Delivery
Table 3: Scope of Delivery for Solar Heat Pump Cylinder
* These items are supplied factory fitted
** Only part of the scope of delivery when not supplied as a Dimplex Heat Pump
package
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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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Pre-Installation
- frost protection
The solar 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.
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.
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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 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.
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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 4, 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 4: 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 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.
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Installation
4.5 Limitations
- The solar collector array must be
specified correctly, to ensure it is
compatible with the model of
cylinder installed. This is to prevent
the cylinder overheating or the solar
array to be exposed to prolonged
stagnation periods.
- The heat exchangers in this range of
cylinders have been specifically
designed for solar applications.
Great care must be taken if using
these cylinders with other heat
sources, due to the heat exchange
capacity of the product.
- Solar cylinders must be installed with
a solar hydraulic pump station,
which incorporates non-return
valves.
- When the cylinder is installed with a
low cost pump station which
incorporates only one non-return
valve, then an additional non-return
valve is to be installed within the
closed loop to prevent gravity
circulation.
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. No
isolating device should 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 5: Connection of the expansion
vessel to the inlet group
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Installation
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 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 6.
Figure 6: Detail showing the connection of
the expansion vessel to the inlet group
5.1.4 Balanced cold water
supply
If 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
Expansion
Vessel
Connection
Balanced
Cold Water
Supply
Expansion
Relief
Valve
Cold
Water to
Cylinder
Cold
Water
from
Mains
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Installation
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 4).
- 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.
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Installation
Figure 7: Wiring diagram for Immersion Heater
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 7. 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.
A torque of 40 Nm is recommended
when tightening up the immersion
after it has been removed and refitted.
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.
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Installation
5.5 Solar coil connections
If the flow connection is the highest
point in the solar loop and if the system
was not commissioned using a flush
and fill pump, an adequate device for
de-aeration must be installed.
For ease of maintenance it is
recommended to install a drain valve
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.
5.6 Auxiliary coil
connections
If the flow connection is the highest
point in the auxiliary heating loop an
adequate device for de-aeration must
be installed.
For ease of maintenance it is
recommended to install a drain valve
at the return connection of the
auxiliary heating coil, if this is the
lowest point in the auxiliary heating
loop.
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.
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Installation
5.7 Thermostat connection
The solar circulation pump and the
auxiliary heating system can be wired
to the cylinder in various ways as
described by the chosen supplier.
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
solar indirect cylinder is to be installed
by default into the auxiliary heating
loop. If the cylinder is located higher
than the solar collector array, a two
port valve has to be installed in the
solar loop and wired accordingly.
Figure 8: Thermostat Wiring Schematic
T
1
T
2
T
3
NOTE: T1 and T2 must be connected. T3 can replace T2 only when
a normally open configuration is required.
To solar pump/
two port valve
From control unit
Temp
control
stat
High
temp cut
out stat
2
1
1
2
3
T4
Earth
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Installation
5.7.1 Auxiliary loop wiring schematic (indirect cylinder only)
Figure 9: Wiring schematic auxiliary loop
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Installation
5.7.2 Solar loop wiring schematic (direct and indirect cylinders)
Figure 10: Wiring schematic solar loop
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Installation
5.7.3 Solar sensor connection
5.7.3.1 Solar Sensor Connection Thermostat Housing (direct x 1, indirect x 2)
Step 1: Access the sensor mounting plate. To do this remove the Dual Cut Out cover
plate (A) by removing the fixing screw and insulation foam (B) to access the sensor
mounting plate (C). Remove the M5 fixing screws in the four corners of the plate.
Step 2: 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).
A
B
C
D
E
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Installation
Step 3: 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.
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.
Step 4: Replace the insulating foam over the sensor mounting plate.
F
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Installation
Step 5: Refit the Dual Cut Out cover plate. Enter the fixing tab into the slot provided
at the base of the enclosure and fit the fixing screw.
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Installation
5.7.3.2 Solar Sensor Connection Boost Immersion (direct x 1, indirect N/A)
Step 1: Access the sensor mounting plate. To do this remove the immersion cover
plate (A) by removing the fixing screw and insulation foam (B) to access the sensor
mounting plate (C). Remove the M5 fixing screws.
Step 2: The sensor mounting plate will have a vacant slot for the solar probe. Slide the
solar probe into place as shown (D).
A
B
C
D
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Installation
Step 3: Return the sensor mounting plate to its fixture position.
Step 4: Fit the M5 fixing screws into the cylinder bracket (F).
Note: Care must be taken to place the probe on the stainless steel of the inner
vessel. There should be no movement in the phial (clip in the centre of the
sensor mounting plate) that is used to hold the probe.
Replace the insulation foam over the sensor mounting plate (G) and refit the immersion
cover plate (H).
F
G
H
Installation
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5.8 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 11).
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
- the secondary return circuit pipe
work to be insulated
- the secondary return pump to be of
suitable material and specification
Figure 11: Secondary return loop
To Taps
From Taps
Swept-T
HW Outlet
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Commissioning
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:
1) Before making any 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 pressure 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) Instruct user in the operation of
the unit and hand over this manual
advising the owner of annual
service requirements.
13) 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
and the thermostat.
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 month, 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 12 for part
descriptions and part numbers.
Maintenance
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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.
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Spare Parts
8 Spare Parts
Figure 12: Replacement part numbers for Solar range of cylinders
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Technical Data
9 Technical data and Product Fiche
Figure 13: Solar Direct Cylinder and Cross-section (for reference only)
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Technical Data
Solar Direct Cylinder Range- Product Dimensions
Reference
175
210
250
300
Weight [kg]
34
38
44
50
Reheat time# [mins]*
101
128
166
208
Average draw off temperature [°C]
61
60
61
61
Hot water draw off capacity# (l)* /
Draw off flow rate (l/s)
100
0.25
115
0.25
151
0.25
195
0.50
HX performance [kW]*
24
22
22
21
Heat Loss [kWh]*
1.12
1.41
1.51
1.96
Dedicated solar volume (l)*
75
95
100
105
Height [mm]
1265
1490
1765
2065
Outer Diameter [mm]
580
580
580
580
HW Outlet [mm]
1040
1265
1540
1840
T&P valve [mm]
1040
1265
1540
1840
CW Inlet [mm]
180
180
180
180
Bottom Immersion [mm]
620
715
780
870
Top Immersion [mm]
885
1110
1340
1610
Solar Return [mm]
180
180
180
180
Solar Flow [mm]
515
515
515
515
Bottom Thermostat [mm]
320
0
320
320
320
Table 5: Solar Direct 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.
# Auxiliary values
GDC Group Ltd
Heat Pump Cylinder Range – Product Fiche
Reference
Energy Rating
Standing Loss [W]
Storage Volume [L]
ECSd175ST-580
B
56
175
ECSd210ST-580
B
59
210
ECSd250ST-580
B
66
250
ECSd300ST-580
B
82
300
Table 6: Solar Direct Cylinder Product Fiche
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Technical Data
Solar Direct Cylinder Range
Reference
175
125
210
175
250
250
300
Actual capacity [L]
175
210
250
300
Materials
- inner cylinder
Duplex stainless steel LDX2101
- outer cylinder
HIPS
- inlet/outlet
Stainless steel
- coils
Stainless steel twin coil
- 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
Cold water supply
- minimum dynamic pressure
1.5 bar
- maximum 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
22mm stainless steel
Coil specification
- surface area [m²]
1.1
- rating [kW]*
24
22
22
21
Immersion heater
1 ¾ F BSP 3kW
Thermostatic control
- direct input
integral immersion heater thermostat and cut out
- indirect input
integral twin thermostat (10 to 70°C) and cut out
(~85°C)
Safety components
- pressure reducing valve and strainer
3 bar
- expansion relief valve
6 bar
- temperature and pressure relief
valve
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
Approvals
KIWA approval number:- 1112702
KIWA
KIWA
Guarantee
- inner cylinder
25 yrs
- immersion heaters
2 yrs - excluding the effects of lime scale
- other components
2 yrs - excluding expansion vessel membrane pressure
Table 7: Solar Direct Product features
* Determined in accordance with EN12897.
# Not including insulation
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Technical Data
Figure 14: Solar Indirect Cylinder and Cross-Section (for reference only)
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Technical Data
Solar Indirect Cylinder Range
Reference
175
210
250
300
Weight [kg]
37
40
47
52
Reheat time# [mins]*
12
15
24
31
Average draw off temperature [°C]
62
60
60
61
Hot water draw off capacity# (l)* /
Draw off flow rate (l/s)
80
0.25
100
0.25
140
0.25
175
0.50
Heat Loss [kWh]*
1.12
1.41
1.51
1.96
Dedicated solar volume (l)*
95
110
110
125
Height [mm]
1265
1490
1765
2065
Outer Diameter [mm]
580
580
580
580
HW Outlet [mm]
1040
1265
1540
1840
T&P valve [mm]
1040
1265
1540
1840
CW Inlet [mm]
180
180
180
180
Bottom Immersion [mm]
570
1145
1345
1645
Solar Return [mm]
180
180
180
180
Solar Flow [mm]
515
515
515
515
Indirect Return [mm]
730
827
895
982
Indirect Flow [mm]
945
1042
1110
1197
Bottom Thermostat [mm]
320
320
0
320
320
Top Thermostat [mm]
840
930
1000
1085
Table 8: Solar Indirect 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.
# Auxiliary values
GDC Group Ltd
Heat Pump Cylinder Range – Product Fiche
Reference
Energy Rating
Standing Loss [W]
Storage Volume [L]
ECSi175ST-580
B
56
175
ECSi210ST-580
B
59
210
ECSi250ST-580
B
66
250
ECSi300ST-580
B
82
300
Table 9:Solar Indirect Cylinder Product Fiche
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Technical Data
Solar Indirect Cylinder Range
Reference / Capacity
175
125
210
175
250
250
300
Materials
- inner cylinder
Duplex stainless steel LDX2101
- outer cylinder
HIPS
- inlet/outlet
Stainless steel
- coils
Stainless steel twin coil
- 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
Cold water supply
- minimum dynamic pressure
1.5 bar
- maximum 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
22mm stainless steel
Coil specification
- indirect coil surface area [m²]
0.8
- solar coil surface area [m²]
1.1
- HX performance indirect coil [kW]*
20
TBA
20
TBA
17
TBA
18
- HX performance solar coil [kW]*
23
22
19
20
- max. working pres. (Solar / Aux.) [Bar]
6 / 3
Immersion heater
1 ¾ F BSP 3kW
Thermostatic control
- direct input
integral immersion heater thermostat and cut out
- indirect input
integral twin thermostat (10 to 70°C) and cut out
(~85°C)
Safety components
- pressure reducing valve and strainer
3 bar
- expansion relief valve
6 bar
- temperature and pressure relief valve
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
Approvals
KIWA approval number:- 1112703
KIWA
KIWA
Guarantee
- inner cylinder
25 yrs
- immersion heaters
2 yrs - excluding the effects of lime scale
- other components
2 yrs - excluding expansion vessel membrane pressure
Table 10: Solar Indirect Product Features
* Determined in accordance with EN12897 at 80°C flow temperature and 0.25l/s flow rate.
# Not including insulation
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Technical Data
Figure 15: Solar Heat Pump Cylinder and Cross-Section (for reference only)
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Technical Data
Solar Heat Pump Cylinder Range
Reference
300
Weight [kg]
58
Reheat time# [mins]*
10
Average draw off temperature [°C]
61
Hot water draw off capacity# (l)* /
Draw off flow rate (l/s)
146
0.50
HX performance [kW]*
19
Heat Loss [kWh]*
1.96
Dedicated solar volume (l)*
141
Height [mm]
2065
Outer Diameter [mm]
580
HW Outlet [mm]
1840
T&P valve [mm]
1840
Secondary Return [mm]
1245
CW Inlet [mm]
180
Bottom Immersion [mm]
970
Solar Return [mm]
180
Solar Flow [mm]
515
Heat Pump Return [mm]
965
Heat Pump Flow [mm]
1620
Bottom Thermostat [mm]
240
Top Thermostat [mm]
1415
Table 11: 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.
# Auxiliary values
GDC Group Ltd
Heat Pump Cylinder Range – Product Fiche
Reference
Energy Rating
Standing Loss [W]
Storage Volume [L]
ECS300HPST-580
B
82
287
Table 12:Solar Heat Pump Cylinder Product Fiche
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Technical Data
Solar Heat Pump Cylinder Range
Reference
300
Actual capacity [L]
300
Materials
- inner cylinder
Duplex stainless steel LDX2101
- outer cylinder
HIPS
- inlet/outlet
Stainless steel
- coils
Stainless steel twin coil
- 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
Cold water supply
- minimum dynamic pressure
1.5 bar
- maximum 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]
2.8
- solar coil surface area [m²]
1.1
- heat pump coil rating [kW]*
49
TBA
TBA
TBA
TBA
TBA
TBA
- solar coil rating [kW]*
19
Immersion heater
1 ¾ F BSP 3kW
Thermostatic control
- direct input
integral immersion heater thermostat and cut out
- indirect input
integral twin thermostat (10 to 70°C) and cut out
(~85°C)
Safety components
- pressure reducing valve and strainer
3 bar
- expansion relief valve
6 bar
- temperature and pressure relief valve
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
Approvals
KIWA approval number:- 1112704
KIWA
KIWA
Guarantee
- inner cylinder
25 yrs
- immersion heaters
2 yrs - excluding the effects of lime scale
- other components
2 yrs - excluding expansion vessel membrane pressure
Table 13: Solar Heat Pump Product Features
* Determined in accordance with EN12897.
# Not including insulation
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Technical Data
9.1 Cylinder heat exchanger pressure drop
Figure 16: Heat exchanger pressure drop for 0.8m² and 1.1m² coils
0.8m
2
Coil Pressure Drop
0
10000
20000
30000
40000
50000
60000
70000
80000
90000
100000
0.0 0.5 1.0 1.5 2.0 2.5 3.0
Flow Rate (m
3
/h)
Pressure Drop (Pa)
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Technical Data
User Instructions
Figure 17: Heat exchanger pressure drop for a 2.8m² coil
2.8m
2
Coil Pressure Drop
0
10000
20000
30000
40000
50000
60000
0.0 0.5 1.0 1.5 2.0 2.5
Flow Rate (m
3
/h)
Pressure Drop (Pa)
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User Instructions
10 User Instructions
10.1 General
“This appliance is not intended for use
by persons (including children) with
reduced physical, sensory or mental
capabilities, or lack of experience and
knowledge, unless they have been
given supervision or instruction
concerning the use of the appliance by
person responsible for their safety.”
“Children should be supervised to
ensure they do not play with this
appliance.”
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.
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Operation
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. For operation
with a solar system it is recommended
to set the auxiliary hot water
temperature to between 45°C and 55°C
(this is between 2 and 3 on the dial,
please refer to Figure 19 for
approximate settings). Higher
temperatures can cause tripping of the
high limit thermostat, introduce more
heat loss from the unit and increase
the risk of scalding significantly.
The solar thermostat should be set to
the highest temperature possible to
maximise solar gains. However, safety
(scalding) and limescale build up have
to be considered.
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.
10.2.1 Water temperature
direct electric heating
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.
Figure 18: Adjustment water temperature direct electric heating element
Dial to adjust water
temperature
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Operation
10.2.2 Water temperature
auxiliary heating
The water temperature achieved by the
auxiliary heating system depends on
the setting of the thermostat on:
- the cylinder AND
- the auxiliary / solar heating source
The adjustment at the cylinder is
carried out on the twin thermostat
fitted to the cylinder as shown in Figure
19. In the event that the high
temperature cut-out engages, it will be
necessary to manually reset the
thermostat. Use a suitable electrically
insulated tool to push the manual reset
button and inform the installer.
Figure 19: Adjustment water temperature auxiliary source
10.3 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.
Dial to adjust water
temperature
Manual re-set
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Troubleshooting
10.4 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.5 Solar malfunction
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
B.5 Check solar loop function
and settings on solar control
unit
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.1 Compression/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
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Troubleshooting
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
Notes
Installation and
User Instructions R01128
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55
Installat
ion and User Instructions R01128
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60
Dimplex a division of GDC Group Ltd
Millbrook House Grange Drive, Hedge End, Southampton SO30 2DF
Tel.: 0845 600 5111
e-mail: [email protected]
www.dimplex.co.uk
