Dimplex Ec-eau Guide

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 3 L

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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. he
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. he 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
0Overall View
Figure 1: Overall view of Heat Pump Cylinder installation process
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03
08
01
06
04
0
05
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Contents
1Contents
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 D ISCHARGE REQUIREMENTS .......................................... 8
4.4.1 Discharge pipe D2 ......................................................................... 9
4.4.2 Worked example ..........................................................................1
4.4.3 Termination of discharge pipe ........................................................11
4.5 L IMITATIONS ............................................................................................11
5 INSTALLATION..........................................................................................12
5.1 C OLD W ATER I NLET WITH I NLET C ONTROL G ROUP ...............................................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 W ATER O UTLET ..................................................................................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 S ECONDARY R ETURN ..............................................................2
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
1 USER INSTRUCTIONS ................................................................................28
1 .1 G ENERAL .............................................................................................28
1 .2 O PERATION ..........................................................................................29
1 .2.1 Water temperature direct electric heating ........................................29
1 .2.2 Water temperature auxiliary heating ...............................................3
1 .3 M AINTENANCE .......................................................................................3
1 .4 T ROUBLESHOOTING .................................................................................31

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Scope of Delivery
2Introduction
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 6 mm of low GWP
insulation foam, together with 1 %
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.
3Scope of delivery
Please ensure you check the scope of
delivery below before signing any
delivery documentation. Claims for
missing or damaged parts after
signing for the delivery will not be
accepted.
* These items are supplied factory fitted
able 1: Scope of Delivery

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Pre
-
Installation
4Pre-Installation
Advice
Please read the following section
carefully before commencing
installation. If in any doubt, please
call the appropriate help desk.
Disregarding the instructions given in
this manual in its entirety and any
relevant regulations, standards and
codes of practice will void the
guarantee of this product.
Handling – depending on the size of
the unit and access to its installation
location, consideration must be given
to the handling of the unit. Please
note that handling, installation and
use of this product is subject to the
Health and Safety at Work Act.
If the unit is not installed
immediately, it should remain in its
protective packaging with all pipe
protectors/end caps applied to
prevent damage and dirt deposit
inside the cylinder and the coils.
Pipe work – the pipe runs should be
executed as short as possible, unused
pipe work should be removed and all
remaining pipe work should be lagged
in accordance with regulatory
requirements to prevent heat loss and
the formation of condensation.
Taps and fittings – all taps and
fittings incorporated in the unvented
system should have a rated operating
pressure of .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
4 mm 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
15 kPa
(1.5 bar)
Maximum inlet supply
pressure
12 kPa
(12 bar)
Minimum flow rate 15 l/min
Max. chlorine content 25 mg/L
Max. water hardness 2 mg/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.

Pre
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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
6 00:2006 + A1:2009).
Figure 2: ypical discharge pipe arrangement

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Pre
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able 2: Sizing of copper discharge pipe “D2” for common temperature relief valve outlet sizes
4.4.2 Worked example
his 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.
herefore 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
herefore the maximum permitted
length equates to 14m.
As the actual length is 7m, a 28mm
(D2) copper pipe will be satisfactory.