Dimplex Ec-eau, Ec-eau 125, Ec-eau 150, Ec-eau 210, Ec-eau 250 Installation And User Instructions Manual

Important - This manual must be left with the user after Installation!

Ec

-

eau

Cylinder

Range

Installation and User Instructions

Heat Pump Cylinders

without buffer tanks

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.

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Overall View

0 Overall View

Figure 1: Overall view of Heat Pump Cylinder installation process

02 03

08

01 06

04

07

05

09

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Contents

1 Contents

0 OVERALL VIEW .......................................................................................... 3

1 CONTENTS ................................................................................................ 4

2 INTRODUCTION ......................................................................................... 6

3 SCOPE OF DELIVERY .................................................................................. 6

4 PRE-INSTALLATION ADVICE ........................................................................ 7

4.1 R

ISK ASSESSMENT

...................................................................................... 7

4.2 S

ITING CONSIDERATIONS

.............................................................................. 7

4.3 C

OLD WATER SUPPLY

................................................................................... 8

4.4 B

UILDING REGULATION G3 DISCHARGE REQUIREMENTS

.......................................... 8

4.4.1 Discharge pipe D2 ......................................................................... 9

4.4.2 Worked example ..........................................................................10

4.4.3 Termination of discharge pipe ........................................................11

4.5 L

IMITATIONS

............................................................................................11

5 INSTALLATION..........................................................................................12

5.1 C

OLD WATER INLET WITH INLET CONTROL GROUP

...............................................12

5.1.1 Correctly site the cylinder..............................................................12

5.1.2 Install the inlet group....................................................................12

5.1.3 Expansion vessel ..........................................................................12

5.1.4 Balanced cold water supply............................................................12

5.1.5 Drain valve ..................................................................................12

5.2 H

OT WATER OUTLET

..................................................................................13

5.2.1 Thermostatic mixing valve.............................................................13

5.2.2 Pipe insulation..............................................................................13

5.3 D

ISCHARGE PIPES FROM SAFETY DEVICES

..........................................................13

5.3.1 Discharge pipe D1............................................................................13

5.3.2 Discharge pipe D2 ........................................................................13

5.3.3 Tundish .......................................................................................14

5.4 I

MMERSION HEATER

....................................................................................14

5.5 C

OIL FLOW CONNECTIONS

............................................................................15

5.6 C

OIL RETURN CONNECTIONS

.........................................................................15

5.7 T

HERMOSTAT CONNECTION AND INSTALLATION OF THE HEAT PUMP

DHW

TEMPERATURE

SENSOR

..................................................................................................16

5.7.1 Connection of the sensor ...............................................................17

5.8 C

ONNECTION OF SECONDARY RETURN

..............................................................20

6 COMMISSIONING......................................................................................21

7 MAINTENANCE..........................................................................................22

8 SPARE PARTS ...........................................................................................23

9 TECHNICAL DATA......................................................................................24

9.1 C

YLINDER HEAT EXCHANGER PRESSURE DROP

.....................................................26

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Contents

10 USER INSTRUCTIONS ................................................................................28

10.1 G

ENERAL

.............................................................................................28

10.2 O

PERATION

..........................................................................................29

10.2.1 Water temperature direct electric heating........................................29

10.2.2 Water temperature auxiliary heating ...............................................30

10.3 M

AINTENANCE

.......................................................................................30

10.4 T

ROUBLESHOOTING

.................................................................................31

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Scope of Delivery

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 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.
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.

* These items are supplied factory fitted

Table 1: Scope of Delivery

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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 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

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- 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.

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.

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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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”

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 2, 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).

Figure 2: Typical discharge pipe arrangement

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Table 2: 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 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.

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- Where a single common discharge
pipe serves more than one system,
it should be at least one pipe size
larger than the largest individual
discharge pipe (D2) to be
connected.

- The discharge pipe should not be
connected to a soil discharge stack
unless the soil discharge stack is
capable of safely withstanding
temperatures of the water
discharged, in which case, it should:

- contain a mechanical seal, which

allows water into the branch pipe
without allowing foul air from the
drain to be ventilated through the
tundish.

- there should be a separate

branch pipe with no sanitary
appliances connected to it.

- if plastic pipes are used as branch

pipes carrying discharge from a
safety device, they should be
either polybutalene (PB) or cross­linked polyethylene (PE-X)
complying with national
standards.

- be continuously marked with a

warning that no sanitary
appliances should be connected
to the pipe.

4.4.3 Termination of discharge

pipe

- “The discharge pipe (D2) from the
tundish should terminate in a safe
place where there is no risk to
persons in the vicinity of the
discharge.”

- Examples of acceptable discharge
arrangements are:

- “to a trapped gully with the end of
the pipe below a fixed grating and
above the water seal;

- downward discharges at low level;
i.e. up to 100mm above external
surfaces such as car parks, hard
standings, grassed areas etc. are
acceptable providing that a wire
cage or similar guard is positioned
to prevent contact, whilst
maintaining visibility; and ,

- discharges at high level: e.g. into a
metal hopper and metal downpipe
with the end of the discharge pipe
clearly visible or onto a roof capable
of withstanding high temperature
discharges of water and 3m from
any plastic guttering system that
would collect such discharges.”

Note: As the discharge would
consist of high temperature water
and steam, asphalt, roofing felt
and non-metallic rainwater goods
may be damaged by such
discharges.

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. 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 3: Connection of the expansion

vessel to the inlet group

It is important to check the
pre-charge pressure of the
expansion vessel membrane
before filling the cylinder. The
pre-charge should be greater
than or equal to 3bar.

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.

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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
manufacturers 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.

5.3.2 Discharge pipe D2

For a detailed description of the
discharge pipework D2 see chapter

4.4.1.

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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 2).

- Discharge should be visible at the
tundish, where discharges may not
be apparent, e.g. in dwellings
occupied by people with impaired

vision or mobility, consideration
should be given to the installation of
a suitable safety device to warn
when discharge takes place, e.g.
electronically operated.

Note: To comply with the Water
Supply (Water Fittings)
Regulations, the tundish should
incorporate a suitable air gap.

It is important that the
tundish is positioned away
from any electrical
components.

Figure 4: 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

4. 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.

The immersion heater typically cannot
be directly switched by the heat pump

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Installation

controller, but instead requires a
relay.

Should it be necessary to remove the
thermostat from the immersion
element, ensure that the contacts are
re-fitted correctly into the positions on
the element. Failure to do so carries
the risk of overheating the contacts
and thus damaging the appliance. The
immersion heater thermostat must
not be opened under any
circumstances.

Note: The cylinder must be filled
with water before switching on
the immersion heater. Failure to
do so will damage the element
and void any guarantee on the
product.

5.5 Coil flow connections

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.

5.6 Coil return connections

Equally, 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.

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 and
installation of the
heat pump DHW
temperature sensor

The heat pump can be wired to the
cylinder in various ways as described
by the chosen supplier.

To conform to building regulations, it
is imperative that the hot water
circulating pump is installed through
the twin thermostat.

If a non Dimplex heat pump is used in
combination with this cylinder or
another heat source, a two port valve
has to be wired after the thermostat,
ensuring compliance with building
regulations.

Figure 5: Heat Pump Loop Wiring

T1

T2

T3

NOTE: T1 and T2 must be connected to the heat pump control

panel, see heat pump installation manual. T3 can replace T2 only

when a normally open configuration is required.

To HP Manager

From HP Manager

Temp

control

stat

High

temp cut

out stat

2

1

1

2

3

T4

Earth

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Installation

5.7.1 Connection of the sensor

Step 1: Access the sensor mounting plate. To do this remove the twin thermostat
box (A) by removing the screws in the 4 corners only and insulation foam (B) to
access the sensor mounting plate (C). Remove the M5 fixing screws.

Step 2: The sensor mounting plate will have two vacant slots for additional sensors
(D). Slide the heat pump sensor into place as shown (E).

D

E

A B

C

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Step 3: Fit two M5 fixing screws into the cylinder bracket (F). Slide the sensor

mounting plate behind the M5 fixing screws (G).

Step 4: Insert two remaining M5 screws (H). 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 (four clips in the centre of the
sensor mounting plate) that are used to hold the bulbs and sensor. Care should be
taken not to overtighten the screws.

H

F

G

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Installation

Step 5: Replace the insulating foam over the sensor mounting plate

Step 6: Refit the twin thermostat box, taking care not to kink the capillaries that

connect the thermostat bulbs to the twin thermostat box.

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Figure 6: Secondary return loop

5.8 Connection of

Secondary Return

A secondary return port is installed on
the 210, 250 and 300L cylinders. 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.

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.

If the secondary return is not used it
should be blanked with a ½” bung.

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

To Taps

From Taps

HW Outlet

Secondary
Return

Swept

-T

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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 and not for the heat pump
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 pressure-relief valve,
assure safe discharge and check
that valve is not dripping when
closed. The pressure-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. Re­assemble 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.

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 7 for part
descriptions and part numbers.

Spare Parts

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8 Spare Parts

Figure 7: Replacement part numbers for Heat Pump range of cylinders

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Technical Data

9 Technical data

Figure 8: Heat Pump Cylinder and Cross-section (for reference only)

Heat Pump Cylinder Range

Reference 125 150 210 250 300
Weight (full) [kg]

152 182 251 302 350

Reheat time [mins]* 7 7 12 17 20
Average draw off temperature [°C]*

61 60 62 63 62
97 120 180 238 267

Hot water draw off capacity (l)* /
draw off flow rate (l/s)

0.25 0.25 0.25 0.25 0.50

HX performance [kW]* 45 51 47 47 43
Heat loss [kWh]

- - - - -

Height [mm]

960 1130 1505 1780 2080

Outer Diameter [mm]

580 580 580 580 580

HW Outlet [mm] 730 900 1275 1550 1850
T&P Valve [mm] 730 900 1275 1550 1850
Secondary Return [mm]

- -

967 1105 1255

CW Inlet [mm] 190 190 190 190 190
Bottom Immersion [mm] 208 208 208 208 208
HP Return [mm]

190 190 190 190 190

HP Flow [mm] 710 845 895 895 930
Bottom Thermostat [mm] 460

545

732

870

1020

Table 3: 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 at 80°C flow temperature and 0.42l/s flow rate.

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Technical Data

Heat Pump Cylinder Range

Reference 125 150 210 250 300
Actual capacity [L] 120 145 210 250 300
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

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 28mm stainless steel
Coil specification

- surface area [m²]

2.2 2.8

3.0

3.2

- rating [kW] 45 51

47

43

Immersion heater

1 ¾ F BSP 3kW @ 240 V

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

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

Approvals

KIWA

approval number:

-

1012717

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 4: Heat Pump Product features

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Technical Data

9.1 Cylinder heat exchanger pressure drop

Figure 9: Heat exchanger pressure drops for 2.2m² and 2.8² coils

2.2m2 Coil Pressure Drop

0

5000

10000

15000

20000

25000

30000

35000

40000

45000

0.0 0.5 1.0 1.5 2.0 2.5

Flow Rate (m3/h)

Pressure Drop (Pa)

2.8m2 Coil Pressure Drop

0

10000

20000

30000

40000

50000

60000

0.0 0.5 1.0 1.5 2.0 2.5

Flow Rate (m3/h)

Pressure Drop (Pa)

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Technical Data

Figure 10: Heat exchanger pressure drop for 3.0m² and 3.2m² coils

3.0m2 Coil Pressure Drop

0

10000

20000

30000

40000

50000

60000

70000

0.0 0.5 1.0 1.5 2.0 2.5

Flow Rate (m3/h)

Pressure Drop (Pa)

3.2m2 Coil Pressure Drop

0

10000

20000

30000

40000

50000

60000

70000

80000

0.0 0.5 1.0 1.5 2.0 2.5

Flow Rate (m3/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 heat pump it is recommended
to set the hot water temperature to
between 45°C and 55°C (this is
between 2 and 3 on the dial, please
refer to Figure 12 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.

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 below.

Figure 11: 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 heating source

The adjustment at the cylinder is
carried out on the twin thermostat
fitted to the cylinder as shown in
Figure 12. 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 12: 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!

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 re­commission

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 mal function

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/maintena
nce), 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

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

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Dimplex a division of GDC Group Ltd

Millbrook House Grange Drive, Hedge End, Southampton SO30 2DF

Tel.: [phone]

e-mail:

[e-mail]
www.dimplex.co.uk