Panasonic Aquarea Tank Duo GH 200 User guide

Design, Installation & Servicing Instructions
Models covered in this manual
Aquarea Duo 200-300 litres
Aquarea Duo (Pre-plumbed) 200-300 litres
Unvented cylinders specifically designed to work with a heat pump

Page 2
Section Page
DESIGN
Description 3
Technical Information 4
System Design 6
INSTALLATION
Installation 8
Commissioning 17
USER INSTRUCTIONS 18
SERVICING AND MAINTENANCE
Servicing and Maintenance 19
Fault Finding 21
Short Parts List 22
APPENDIX
Appendix A 23
Appendix B 24
Terms & Conditions 25
Benchmark Checklist 26
Benchmark Service Record 27
ISSUE 2: JUNE 2016
These instructions should be read in conjunction with the installation/servicing
instructions issued by the manufacturer of the heat source being used.
Any installation must be in accordance with the relevant requirements of the Building
Regulations, I.E.E.Wiring Regulations and the Water Fitting Regulations (England and
Wales) or Water Byelaws (Scotland). It should be read in accordance with the relevant
recommendations of the following:
BS EN 12828, BS EN 12831, BS EN 14336;
BS 5440:1; BS 5440:2; CP 331:3
BS EN 806-1 to 5, BS EN 8558:2011 and BS 7593:2006
Aquarea is covered by Section G3 of the Building Regulations (England and Wales)
Technical Standard P3 (Scotland) and Building Regulation P5 (Northern Ireland),
technical guidance documents G and L and SEI Heating and Domestic Hot Water
Systems for Dwellings - Achieving compliance with Part L 2008 (Republic of Ireland).
Compliance can be achieved via a Competent Person Self Certication Scheme or
noticaton of installation to the Local Authority Building Control Department.
It must be installed by a competent person as dened by the relevant regulations.
Manufacturers notes must NOT be taken as over-riding statutory obligations.
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 use of the appliance by
a person responsible for their safety. Children should be supervised at all times to
ensure they do not play with the appliance.
This information is provided to assist generally in the selection of equipment.
Responsibility for selection and specication of our equipment must however remain
that of our customer and any experts or consultants concerned with the installation(s).
Please note: that we do not therefore accept any responsibility for matters of
design selection or specication, for the eectiveness of an installation or system
containing one of our products unless specically requested to do so in writing.
All goods are sold subject to our Conditions of Sale which are set out at the rear of this
specication. In the interest of continuously improving the Aquarea range, Aquarea
reserve the right to modify the product without notice, and in these circumstances
this booklet, which is accurate at the time of printing, should be disregarded. An
updated set of Instructions will be produced and supplied with new appliances and
will be made available for other appliances on request.
Aquarea is produced under an ISO 9001:2008 Quality Management System
approved by BSI.
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 manufacturers 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.

Page 3
Maintenance
Modifications should not be made to this
product. Replacement parts, including
immersion heaters, should be purchased
from Aquarea, or agents approved by them.
Unvented hot water storage vessels need
regular routine checks, and these are detailed
below. It is for this reason that this manual must
always be left with the Aquarea.
It is essential that these checks be carried out
at the time of boiler maintenance by a qualied
installer:
1. Manually open the relief valves in turn, and
check that water is discharged from the
valves and runs freely through the tundish
and out at the discharge point. Ensure that
the valves re-seat satisfactorily. (Note - the
water may be very hot).
2. It is important to check that the discharge
pipework is carrying the water away
adequately. Check for blockages etc. if it is
not.
3. Turn the mains water o and remove and
clean the strainer element in the Pressure
Reducing Valve.
4. Check the charge pressure in the expansion
vessel and repressurise if required
5. Re-ll the system and ensure that all relief
valves have re-seated.
6. The Benchmark Service Record should be
updated at each service.
7. Check the water pressure downstream of the
combination valve is bar in static condition.
8. Check and if necessary, descale the heat
exchanger in hard water areas ie. above
200ppm (mg/l).
Note:
The cylinder is factory tted with a temperature
& pressure relief valve that must not be used for
any other purpose or removed.
The cylinder is factory tted with immersion
heaters with thermal cut outs. Immersions
without thermal cut outs must not be tted.
Product Details
Maximum inlet pressure to
Pressure reducing valve 12 bar
Operating pressure (PRV setting) 3 bar
Expansion vessel charge pressure 3 bar
Expansion relief valve setting 4.5 bar
Opening pressure of P & T Relief Valve 6 bar
Opening temperature of P & T Relief Valve 92-95°C
Energy cut-out thermostat setting 82°C
Max. working pressure - Primary heat exchanger (Indirect models) 6 bar
Immersion heater rating 3kW, 240V AC
All cylinders are manufactured in accordance with the requirements of BS EN 12897
The tundish must be positioned so that it is visible to the occupant and is away from
electrical devices.
Components supplied with Aquarea:
• Cold water inlet PRV combination valve/expansion relief
• Pressure and temperature relief valve
• Control thermostat
• Energy cut-out thermostat
• Energy cut-out motorised valve (indirects only)
• Tundish
• 3kW Immersion heater including control and cut out thermostats
• Expansion vessel/mounting bracket/exible hose
• Technical/user product literature
In any situation where the volume of heated pipework (eg. secondary circulation
pipes or manifold pipework for multiple units) exceeds 10 litres, then an
additional expansion vessel must be tted to accommodate the extra expansion
volume.
Handling Before Installation
Aquarea must be handled with care and stored the correct way up in a dry place.
Any manual handling/lifting operations will need to comply with the requirements
of the Manual Handling Operations Regulations issued by the H.S.E. The appliance
can be moved using a sack truck on the rear face although care should be taken and
the route should be even. In apartment buildings containing a number of storeys we
would recommend that the appliances are moved vertically in a mechanical lift. If it is
proposed to use a crane, expert advice should be obtained regarding the need for
slings, lifting beams etc.
A specic manual handling assessment is shown in Appendix B at the rear of this
manual.
The Environment
This product has been manufactured using many recyclable materials, including the
approved HCFC/CFC free polyurethane foam insulation. At the end of its useful life, it
should be disposed of at a Local Authority Recycling Centre, to maximise the products
full environmental benets.
DESIGN
DESCRIPTION

Page 4
DESIGN
TECHNICAL INFORMATION
NOTES
1. Recovery times base on Primary Coil/I.H. duty (ie. assumes the heat pump output is adequate).
1. Measured at 0.25 l/s primary ow rate 2. Measured at 0.25 l/s primary ow rate and at 55°C ow temperature
Table 1
Aquarea Duo GH 200/70L Heat Pump Buer GH 300/70L Heat Pump Buer
Panasonic Product Code PAW-TE20BUF70-UK PAW-TE30BUF70-UK
Product Stock Code
ASLPAN200HP3SQM70BUF ASLPAN300HP3SQM70BUF
Energy eciency class C D
Heat loss watts 84 109
Capacity - total volume litres 210 300
Volume heated by IH litres 199 279
Weight - empty/full kg 52/322 56/426
Pressure regulating valve setting bar 3 3
Expansion relief valve setting bar 4.5 4.5
Temperature setting (P&T valve) °C 95 95
Pressure setting (P&T valve) bar 6.0 6.0
Expansion vessel size (volume) litres 24 35
Expansion vessel initial charge pressure bar 3 3
Height mm 1992 2030
Diameter mm 550 630
Buer vent A mm 2000 2037
Buer connections B mm 1657 1752
T&P relief valve C mm 1235 1330
Hot supply D mm 1190 1330
Heat pump ow E mm 1440 1510
Secondary return F mm 1127 1170
Control thermostat (x2) G mm 495 560
Heat pump return H mm 265 310
Immersion heater J mm 220 240
Cold feed K mm 230 230
Primary heat exchanger surface area 1m23 3
Primary heat exchanger thermal rating 1kW 17.91 13.18
Primary heat exchanger pressure loss 1bar 0.032 0.032
Heat up time from 15°C to 50°C 2min 20.47 42.5
Average domestic hot water
temperature 1°C 46.77 42.06
Buffer CH Flow 60°
Buffer CH Return 40°
Cold Feed 25°
Buffer Inspection Port 20°
T & P Relief Valve 7.5°
Buffer Stat Pocket
Cylinder Stat Pocket
Immersion Heater
Buffer HP Return 15°
2nd Cylinder Stat Pocket 27.5°
Buffer HP Flow 35°
Cylinder HP Flow & Return 35°
Hot Supply 52.5°
Secondary Return 57.5°
F
C
G
H
J
G
A
D
K
E
B

Page 5
NOTES
1. Recovery times base on Primary Coil/I.H. duty (ie. assumes the heat pump output is adequate).
1. Measured at 0.25 l/s primary ow rate 2. Measured at 0.25 l/s primary ow rate and at 55°C ow temperature
Table 2
Aquarea Duo Pre-Plumbed GH 200/70L PP Heat Pump Buer GH 300/70L PP Heat Pump Buer
PAW-TE20BUF70PRE-UK PAW-TE30BUF70PRE-UK
Product Stock Code
ASLPAN200HP3SQM70BUFPP ASLPAN300HP3SQM70BUFPP
Energy eciency class C D
Heat loss watts 84 109
Capacity - total volume litres 210 300
Volume heated by IH litres 199 279
Weight - empty/full kg 57/327 61/431
Pressure regulating valve setting bar 3 3
Expansion relief valve setting bar 4.5 4.5
Temperature setting (P&T valve) °C 95 95
Pressure setting (P&T valve) bar 6.0 6.0
Expansion vessel size (volume) litres 24 35
Expansion vessel initial charge pressure bar 3 3
Height mm 1992 2030
Diameter mm 550 630
Buer vent A mm 2000 2037
Buer connections B mm 1657 1752
Cold feed C mm 1110 1205
Hot supply D mm 1190 1330
Tundish E mm 690 825
Secondary return F mm 1127 1170
Heat pump ow G mm 963 1000
Control thermostat (x2) H mm 495 560
Immersion heater J mm 220 240
Heat pump return K mm 390 433
Primary heat exchanger surface area 1m23 3
Primary heat exchanger thermal rating 1kW 17.91 13.18
Primary heat exchanger pressure loss 1bar 0.032 0.032
Heat up time from 15°C to 50°C 2min 20.47 42.5
Average domestic hot water
temperature 1°C 46.77 42.06
DESIGN
TECHNICAL INFORMATION
Buffer CH Flow 60°
Buffer CH Return 40°
Cold Feed 25°
Buffer Inspection Port 20°
T & P Relief Valve 7.5°
Buffer Stat Pocket
Cylinder Stat Pocket
Immersion Heater
Buffer HP Return 15°
2nd Cylinder Stat Pocket 27.5°
Buffer HP Flow 35°
Cylinder HP Flow & Return 35°
Hot Supply 52.5°
Secondary Return 57.5°
F
E
H
H
J
G
A
D
K
C
B

Page 6
DESIGN
SYSTEM DESIGN
2
8
15
3
4
1
6
11
12
5
7
9
10
11
13
14
Aquarea Duo Cylinder
Basic Appliance
1. Buer vent / AAV (½”female)
2. CH ow (1”compression)
3. CH return (1”compression)
4. Inspection port (1¾” female)
5. Buer sensor pocket (22mm dual pocket)
6. Buer HP return (1”compression)
7. HP ow (1”compression)
8. T&P relief valve (½”female)
9. Hot supply (¾”compression)
10. Secondary return (¾”compression)
11. Control thermostat (22mm dual pocket)
12. HP return (28mm plain pipe)
13. Immersion heater (1¾”female)
14. Cold feed (22mm plain pipe)
15. Three port motorised valve
Part G3 loose components supplied in a
separate box’
A. Combination inlet group incorporating
pressure reducing valve, strainer, check valve,
balance cold take o point, expansion relief
valve and expansion vessel connection points.
B. Potable expansion vessels c/w exible hose
and wall bracket
C. Tundish
D. Dual control thermostat and combined
overheat thermostat
E. Wiring junction box for primary system

Page 7
Aquarea Duo Pre-Plumb Cylinder
Basic Appliance
1. Buer vent / AAV (½”female)
2. CH ow (1”compression)
3. CH return (1”compression)
4. Inspection port (1¾” female)
5. Buer sensor pocket (22mm dual pocket)
6. Hot supply (¾”compression)
7. Cold feed (¾” compression)
8. Secondary return (¾”compression)
9. HP ow (1”compression)
10. Tundish (22mm compression)
11. Control thermostat (22mm dual pocket)
12. HP return (1” compression)
13. Immersion heater (1¾”female)
14. Three port motorised valve
15. Combination inlet group incorporating
pressure reducing valve, strainer, check valve,
balance cold take o point, expansion relief
valve and expansion vessel connection points
16. Auto bypass
17. System pressure gauge
18. Filling loop
Part G3 loose components supplied in a
separate box’
A. Potable expansion vessels c/w exible hose
and wall bracket
B. Wiring junction box for primary system
SYSTEM DESIGN
DESIGN
2
7
10
15
17
3
4
1
11
12
5
9
18
6
14
16
8
11
13

Page 8
Aquarea is a range of unvented hot water storage cylinders, manufactured in the latest
high quality duplex stainless steel. They are designed to provide mains pressure hot
water and are supplied as a package which complies with Section G3 of the Building
Regulations. The appliance is extremely well insulated using high density HCFC free
foam insulation with an ozone depleting potential (ODP) of zero and a global warming
potential (GWP) of 1. It is tted with all necessary safety devices and supplied with all
the necessary control devices to make installation on site as easy as possible.
The Aquarea Duo product is an unvented cylinder and buer tank combined in one
case. It has been specically designed to work with a heat pump source of heat.
The 70 litre buer tank lowers the number of times the heat pump needs to switch
on and o. This extends the life of the compressor in the heat pump. It also enables a
constant ow rate to be maintained through the heat pump heat exchanged which
promotes its ecient operation.
The buer is xed above the 200 or 300 litre hot water cylinder. Both of these hot
water cylinders include a 3m2highly ecient multi-pass corrugated stainless steel
heat exchanger, and an immersion heater for backup and sterilisation purposes. The
multi pass arrangement of the coil enables high ow rates to be passed through it
with low pressure losses.The immersion heater is usually controlled by the heat pump
control system which determines when it needs to run based upon the parameters
selected by the commissioning engineer.
The product is supplied with; a full divert 3 port valve as the energy cut o and the
PTRV which will prevent any overheating of the DHW cylinder; and the usual inlet
control group and expansion cylinder components required for unvented systems.
Important notes:
1. All Aquarea Duo cylinders are suitable for both open vented and sealed primary
systems. Minimum 5m H2O working pressure.
2. When used with a sealed primary heating system, the heat pump must incorporate
its own over heat thermostat.
3. Aquarea Duo cylinders must not be used with solid fuel boilers or steam as the
heat source.
4. Heat pumps can normally only heat the domestic hot water to between 45
– 50/60°C. The Aquarea heat pump remote controller will operate a cylinder
sterilisation on a weekly basis. See heat pump manual for further details.
5. The cold supply elbow c/w drain tapping must be tted. A exible hose can then
be connected to the drain tapping and providing the hose runs below the lowest
level of the cylinder, then all the water content can be drained out by the symphonic
action. Please refer to the drain down procedure on page 17.

Page 9
General Design Considerations
The cupboard footprint needs to be at least 730mm square for units up to 300 litres.
The base chosen for the cylinder should be level and capable of supporting the weight
of the unit when full of water as shown in General Data. The discharge pipework for the
safety valves must have a minimum fall of 1 : 200 from the unit to a safe discharge point. All
exposed pipework and ttings on the cylinder should be insulated, and the unit should
NOT be xed in a location where the contents could freeze.
In new systems, pipes should be insulated to comply with building regs, the maximum
permissible heat loss is indicated in the table below, and labelled accordingly as follows:
i. Primary circulation pipes for domestic hot water circuits should be insulated
through their length, subject only to practical constraints imposed by the need
to penetrate joists and other structural elements.
ii. All pipes connected to hot water storage vessels, including the vent pipe, should
be insulated for at least 1 metre from their points of connection to the cylinder (or
they should be insulated up to the point where they become concealed).
In replacement systems, whenever a heat pump or hot water storage vessel is replaced
in an existing system, any pipes that are exposed as part of the work or are otherwise
accessible should be insulated as recommended for new systems, or to some lesser
standard where practical constraints dictate.
The pipe connecting the heat pump ow to the appliance must not be less than
22mm copper or equivalent.
Further guidance on converting heat loss limits to insulation thickness for specic
thermal conductivities is available inTIMSA“HVAC guidance for achieving compliance
with Part L of the Building Regulations”.
INSTALLATION
INSTALLATION
Mains Water Supply
Existing properties with a 15mm supply will be
satisfactory provided the local mains pressure
is good, but should be confined to single
bathroom properties. For new properties where
simultaneous demand is required to more than
one bathroom or a bathroom and one or more
en-suites, the communication and service pipe
into the dwelling should be a minimum of 22mm
(usually in the form of a 25mm MDPE supply).
The optimum performance is achieved if the
inlet pressure is 3 bar dynamic. However, the
Aquarea will function with lower inlet pressures,
but this will reduce the performance. There
should be a ow of at least 30 litres per minute
or above available into the property. Normally
Aquarea provides well in excess of 40 litres/min
in most conditions. Flow rates for ALL mains
pressure systems are subject to district pressures
and system dynamic loss. Particularly on larger
properties with more than one bathroom, the
pipe sizes should be calculated in accordance
with BS EN 806-3:2006 and BS 8558:2011.
Insulation of pipework
Pipe outside diameter Maximum heat loss
15mm 7.89W/m
22mm 9.12W/m
28mm 10.07W/m
35mm 11.08W/m

Page 10
INSTALLATION
Model Selection
The suggested model sizes shown in the table
opposite are based on a typical daily hot water
usage and on the assumption that the heat
pump will heat the domestic hot water to about
50°C. For higher specication, an increase of one
model size should be considered.
When sizing the hot water cylinder, please use
MCS guidelines in MIS3005 and also refer to BS
EN 806:1-5 AND BS EN 8558.
Aquarea Duo cylinder/Heat Pump Selection Guide
The table above can be used to match heat pumps to heat pump cylinders.
To use, first obtain the maximum flow rate from the heat pump manufacture’s
instructions, match this to the ow rates in section 1 and follow this ow rate’s column
down through the other sections.
Section 2 shows the velocity in the pipe work of dierent diameters at this ow rate. A
maximum ow velocity of 1m/s has been chosen to limit ow noise. Use this section to
choose the correct pipe diameter.
Aquarea Duo Cylinder Selection Guide
Number of
bedrooms
Number of bathrooms
and shower rooms Suggested model size (litres)
1-3 1 bathroom 200
2-3 1 bathroom +
1 shower room
200
2-3 1 bathroom +
2 shower rooms
200
2-4 2 bathrooms +
1 shower room
300
2-4 2 bathrooms +
2 shower rooms
300
3-5 2 bathrooms +
2 shower rooms
300
Aquarea Duo cylinder/Heat Pump Selection Guide
1 - Flow rates in various units for comparison with heat pump manufacturers data
m3/h 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25
l/min 8.33 12.50 16.67 20.83 25.00 29.17 33.33 37.50 41.67 45.83 50.00 54.17 58.33 62.50 66.67 70.83
l/sec or kg/s 0.14 0.21 0.28 0.35 0.42 0.49 0.56 0.63 0.69 0.76 0.83 0.90 0.97 1.04 1.11 1.18
2 - Velocity in pipe (limited to 1 m/s maximum) for pipe sizing
m/s in 22mm 0.37 0.55 0.73 0.91 - - - - - - - - - - - -
m/s in 28mm 0.23 0.34 0.45 0.56 0.68 0.79 0.90 - - - - - - - - -
m/s in 35mm 0.14 0.22 0.29 0.36 0.43 0.51 0.58 0.65 0.72 0.79 0.87 0.94 - - - -
m/s in 42mm 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85
3 - Operating power of heat exchanger suitable for cylinder based on a 5 degree temperature dierence
kW @ 5K dt 3-4 4-6 5.5-8 7-10 8-12 10-14 11-16 13-18 14-20 16-22 17-24 18-26 20-28 21-30 23-32 24-34
200HP ---------
300HP - - - - -
4 - Pressure loss (bar) for each ow rate above in the available coil combinations
200HP 0.017 0.040 0.074 0.118 0.173 0.239 0.316 0.405 0.505 0.617 0.741 0.877 1.025 1.184 1.356 1.540
300HP 0.008 0.019 0.036 0.058 0.086 0.120 0.160 0.206 0.259 0.318 0.384 0.457 0.536 0.623 0.716 0.816
INSTALLATION
Section 3 shows the maximum operating power
of the coils in the cylinder. Shaded squares show
the range of operating powers suitable for a
cylinder in either of its set ups.
Section 4 shows the pressure loss across the
coils at this ow rate for all cylinders in both
congurations.

Page 11
INSTALLATION
INSTALLATION
INCOMING COLD SUPPLY
M
DC
DC
DC
TO
EXTERNAL
TAP
SINK
WATER SOFTENER (IF NECESSARY)
WM or DWM
WHB W.C.
DC
DC
SH
DHW
WHB
WC BATH
SCV SCV
P&T
ERV/NRV
PRV
DCV
Note:
Cold supplies to single taps must be
taken from the mains cold water
system.
Cold supplies to mixer taps must be
taken from the balanced cold water
connection on the combination
valve.
General Restrictions
a. The highest hot or cold water draw o point should not exceed 10 metres above
the Pressure Reducing Valve.
b. An ascending spray type bidet or any other appliance with a Class 1 back-syphonage
risk requiring a type A air gap should not be used.
c. Aquarea should not be used where steam is the primary heating medium, or in a
situation where maintenance is likely to be neglected.
d. Unvented cylinders are not suitable for use with solid fuel boilers.
e. If the supply to the mixer ttings (other than a dual outlet type) is not taken
from the balanced supply the system will become over pressurized and cause
the pressure relief valve to discharge. Over time this could also cause the
premature failure of the appliance itself which will not be covered by the
warranty.
f. In larger properties with a number of bathrooms/en-suites and long pipe runs
we would recommend that the balance cold supply is provided with its own
pressure reducing valve and is not taken from the balanced cold connection on
the combination valve. In this case it will also be necessary to t a small expansion
vessel on the balanced cold water system to accommodate the pressure rise caused
by the increase in temperature of the balanced cold water.
g. Check the performance requirements of the terminal ttings with regard to ow/
pressure are suitable.
Shower Fittings
Aerated taps are recommended to prevent splashing. Any type of shower mixing valve
can be used as long as both the hot and cold supplies are mains fed. However, all
mains pressure systems are subject to dynamic changes particularly when other hot
and cold taps/showers are opened and closed, which will cause changes in the water
temperature at mixed water outlets such as showers. For this reason and because
these are now no more expensive than a manual shower we strongly recommend
the use of thermostatic showers with this appliance. These must be used in 3 storey
properties where the impact on pressure/temperature of opening another tap in the
system is greater than normal. The shower head provided must also be suitable for
mains pressure supplies.
Pipe Layout
In all mains pressure installations it is important
to remember that the incoming cold supply
must be shared between all terminal ttings. It
is important that a 22mm supply is brought to
the appliance and a 22mm take-o is continued
at least to the bath. If there are two baths, 28mm
pipework should be considered. One metre of
smaller diameter pipework, or ow restrictors,
should be provided on the nal connection to
all outlets so as to balance the water available.
In any event the distribution pipework should
generally be in accordance with BS EN 806-1 to 5.
Plastic Pipework
This appliance is suitable for use with
plastic pipework as long as the material
is recommended for the purpose by the
manufacturer and is installed fully in accordance
with their recommendations.
Secondary Hot Water Circulation
Some models are fitted with a secondary
return tapping as standard (see table 1 for
details). If tted, an extra expansion vessel
may be necessary. A non-return valve MUST
be FITTED near the return connection. No valve
or terminal tting should be installed between
the non return valve and the cylinder. All pipes
kept hot by the secondary circulation should
be insulated.

Page 12
15 mm
discharge
pipe
Expansion
relief valve
Typical Discharge Pipe Arrangement
Dotted line showing
alternative route with
single tundish being used
600 mm max.
P & T
Relief
Valve
300 mm
min.
22 mm metal pipe with continuous
fall up to 9m equivalent length (D2).
NOTES:
The discharge will consist of scalding
waterand steam. Asphalt, roong felt
and non-metallic rainwater goods may
be damaged by such discharges.
It is not acceptable to discharge straight
into a soil pipe.
Discharge below
xed grating
Fixed Grating
Trapped gully
Pressure & Temperature/expansion Relief
Valve Pipework
The relief valve should be installed to discharge
in accordance with G3 of the Approved
Document of the Building Regulations and
should be piped to where it is visible, but will
not cause danger to persons or damage to
materials.
The following information is taken from
Approved Document G3 of the Building
Regulations and is provided to assist with
the design and installation of the discharge
pipework. However, the information is not
exhaustive and reference should always be
made to Approved Document G3 of the Building
Regulations. The nal decision regarding any
arrangements rests with Building Control and
it is recommended that their advice is sought
if you have any concerns regarding this aspect
of the installation.
The two safety valves will only discharge
water under fault conditions. When operating
normally water will not be discharged.
The tundish should be vertical, located in the
same space as the unvented hot water storage
system and be tted as close as possible and
within 600mm of the safety device e.g. the
temperature relief valve.
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, be
of metal and:
a) 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. discharge pipes between 9m and 18m
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 ow resistance. Refer to the table and
the worked example.
An alternative approach for sizing discharge
pipes would be to follow BS EN 806-2:2005
Specication for design installation, testing
and maintenance of services supplying water
for domestic use within buildings and their
curtilages.
b) Have a vertical section of pipe at least
300mm long, below the tundish before any
elbows or bends in the pipe work.
c) Be installed with a continuous fall.
Worked Example
The example below is for G1/2 temperature relief valve with a discharge pipe (D2)
having 4 elbows and length of 7m from the tundish to the point of discharge.
From Table 1:
Maximum resistance allowed for a straight length of 22mm copper discharge
pipe (D2) from a G1/2 temperature relief valve is: 9m subtract the resistance for
4 x 22mm elbows at 0.8m each = 3.2m.
Therefore the maximum permitted length equates to: 5.8m.
5.8m is less than the actual length of 7m therefore calculate the next largest size.
Maximum resistance allowed for a straight length of 28mm pipe (D2) from a G1/2
temperature relief valve equates to: 14m.
As the actual length is 7m, a 28mm (D2) copper pipe will be satisfactory.
Table 1: Sizing of copper discharge pipe‘D2’ for a temperature relief
valve with a G1/2 outlet size (as supplied)
Size of discharge
pipework
Maximum length of
straight pipe
(no bends or elbows)
Deduct the gure
below from the
maximum length for
each bend or elbow in
the discharge pipe
22mm Up to 9m 0.8m
28mm Up to 18m 1m
35mm Up to 27m 1.4m
INSTALLATION
INSTALLATION

Page 13
INSTALLATION
INSTALLATION
d) It is preferable for the discharge to be visible at both the tundish and the nal point
of discharge but where this is not possible or practically dicult there should be
clear visibility at one or other of these locations. Examples of acceptable discharge
arrangements are:
1. Ideally below the xed grating and above the water seal in a trapped gulley.
2. Downward discharges at a low level; i.e. up to 100mm above external surfaces
such as car parks, hard standings, grassed areas etc are acceptable providing
that where children play or otherwise come into contact with discharges, a
wire cage or similar guard is positioned to prevent contact whilst maintaining
visibility.
3. Discharges at a high level; e.g. into metal hopper and metal down pipe with the
end of the discharge pipe clearly visible (tundish visible or not) or onto a roof
capable of withstanding high temperature discharges of water and 3m from
any plastic guttering systems that would collect such discharges.
4. Where a single pipe serves a number of discharges, such as in blocks of ats,
the number served should be limited to not more than 6 systems so that any
installation can be traced reasonably easily. The single common discharge pipe
should be at least one pipe size larger than the largest individual discharge pipe
to be connected. If unvented hot water storage systems are installed where
discharges form safety devices may not be apparent i.e. in dwellings occupied by
blind, inrm or disabled people, consideration should be given to the installation
of an electronically operated device to warn when discharge takes place.
Safety
The safety devices supplied or tted on an Aquarea are selected for their suitability
for the temperatures and pressures involved. They must not be changed, removed or
by-passed and it is essential that only genuine replacement parts supplied or approved
by Aquarea are used.This includes the immersion heaters, which must incorporate an
energy cut-out. All parts are available to approved installers from Aquarea.
Combination Inlet Group
Combines elements 1, 2 and 3 below.
1. Pressure Reducing Valve - This must be xed near the cylinder. The cold water supply
to any mixer taps/showers must be taken from the cold water tapping of this valve
to ensure balanced hot and cold pressures. This valve is factory set to ensure the
correct operating pressure for the Aquarea.
2. Non Return Valve - This is integral with the pressure reducing valve to prevent
backow of hot water towards cold water draw o points.
3. Cold Water Expansion Relief Valve - This safety device is preset at the factory and
will relieve excess cold water pressure resulting from a fault condition.
Line Strainer
This is integral within the combination inlet group to reduce the likelihood of
contaminants fouling the valve seat. Following installation this line strainer must be
cleaned and replaced. This needs to be carried out on a regular basis. as part of the
annual maintenance/service check.
Tundish
This is to allow the discharge from any Relief Valve to be seen. It must be tted away
from any electrical devices. See page 15 for discharge pipework details.

Page 14
Temperature/pressure Relief Valve
This safety device is also pre-set at the factory and relieves before the temperature
reaches 100°C. It is also a Pressure Relief Valve, and is pre-set to 6 bar.
Immersion Heater
The immersion heaters tted to our units are 3kW 240V ~AC. Check that the mains
supply conforms to this, and all external wiring conforms to the most recent
revision of the IEE wiring regulations. An Incoloy element is used on this product for
standard domestic use and water conditions, use our Titanium elements in all other
circumstances.
The immersion heater is tted into the hot water cylinder using an O-ring. After the
unit is lled with water check for leaks to determine if the O-ring has sealed and
tighten carefully using the appropriate tool. To prevent damage to the O ring do not
use excessive force to tighten the immersion heater.
The immersion heater is supplied with a thermostat which has been tested
for operation in the cylinder and complies with the European directives for
Electromagnetic compatibility and radio interference. It is Rated at 16 Amp 250V ~AC.
The immersion thermostat has two terminals A and B. The Live (brown) wire should
be connected to terminal A and the Neutral (blue) wire should be connected to
terminal B. It has been our experience that Crimp terminals make better connections.
The immersion heater must be fully earthed (earth post) and connected via a double
pole isolator switch having a contact separation at least 3mm, see diagram above.
Danger of electrocution: before making any adjustments to the thermostat
isolate the immersion heater from the mains electricity supply at the fuse spur
unit.
The immersion heater thermostats incorporate a manual reset safety/overheat cut
out thermostat. Should this operate, investigate the cause for the operation cut out
before pressing the red reset button labelled safety. If there is no apparent fault adjust
the control setting down slightly to prevent nuisance tripping.
If another heat source is used to heat the cylinder and this is allowed to raise the
water temperature excessively then the overheat thermostat will trip. This is likely
on solar thermal products when the solar thermostats are set at high temperatures.
The Direct cylinder is intended to be heated from an o peak supply using the lowest
immersion heater(s) and boosted via the upper immersion heater from an on peak
supply. Suitable controllers are available to control this operation eectively.
INSTALLATION
INSTALLATION
All Aquarea Duo cylinders are tted with a 3kW
immersion heater so that the store temperature
can be raised above that which the heat pump
provides, to boost the hot water performance
if necessary and to protect against legionella
eg. following the time parameters set on the
Aquarea remote control.
Control/overheat Dual Thermostats
Care must be taken to ensure that the solar
probes are fully inserted into the pockets
provided.
Immersion Heater Wiring
E
L
N
Thermostat Type TSR tted in the
Direct cylinders; is supplied set at
62°C ± 3°C. Position 4 is 55°C ± 3°C
and position 5 is 68°C ± 3°C.

Page 15
INSTALLATION
INSTALLATION
Heating And Primary Systems
Although the heat pump and the primary heating system should be sized and installed
in accordance with BS EN 12828:2003, BS EN 12831:2003 & BS EN 14336:2004 the
following should also be taken into account during the design and installation phase.
The heat pumps normally operate at lower ow temperatures; typically 45 – 55°C
compared with 75 – 80°C for the boilers. Therefore if traditional radiators are used
then, these should be oversized in accordance with the heat pump manufacturers
recommendations. For optimum eciency (i.e. COP of a heat pump), low temperature
under oor heating system should be considered.
The heat pumps normally operate at lower temperature dierence between ow and
return compared with the traditional boilers and therefore when sizing the pipework
heat pump manufacturers recommendations should be taken into account.
Safety
Aquarea Duo cylinder is tted with a combined temperature and pressure relief valve
to cope with any increase in temperature and pressure in the cylinder above the design
limits, when used with heat sources up to 45kW total output.
The 3 port spring return motorised valve supplied tted on the ow from the heat
pump unit. The heat pump remote control unit sets the position of the valve to either
cylinder charging (port A) or central heating (port B). Power is supplied to the 3 port
valve when in cylinder charging mode. Therefore the cylinder cannot be heated if
there is no power to the valve.
The cylinder (tank) sensor sends accurate temperature information to the remote
control unit, this information coupled with the program times, controls the cylinder
charging. If the cylinder is not heated quickly enough the Boost immersion heater
will function automatically. Once the tank temperature has exceeded the tank set
temperature by 2° the valve will be closed.
The Boost immersion heater has its own controls to prevent it overheating the cylinder.
• Sealed heating system
A heat pump selected must be suitable for use in a sealed heating system which
may have working pressure of up to 3.0bar and it must be tted with an overheat
temperature cut-out device.
Unvented (i.e. sealed primary circuits may
be filled or replenished by means of a
temporary connection between the circuit
and a water supply pipe provided a WRC
‘Listed’ double check valve and lling loop
or some other no less eective backow
prevention device is permanently connected
at the inlet to the circuit and the temporary
connection is removed after use. This is
supplied tted with the pre-plumbed unit.
Alternatively, a CA device can be used which
will allow the system to be permanently
connected to the cold mains supply. The
primary system can then be topped up,
when required, in the same way as an open
vented system tted with an F&E cistern.
Schematic Sealed Primary System
Heat Pump
Expansion
Vessel
Gauge
Safety Valve

Page 16
INSTALLATION
INSTALLATION
Typical schematic wiring diagram for Aquarea Duo heating system.
Please refer to the heat pump manufacturers installation instructions.
Three-way Valve
Cable
Terminals on the Mono bloc unit 1
CLOSE OPEN N L N COOL HEAT N CLOSE OPEN
23456
Lead wire cord
7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Booster Heater
Cord
Solar Three-way
Valve Cable
Tank OLP
Cable
Tank
Sensor
Cable
External
Controller
Cable
Solar Pump
Station
Cable
Room
Thermostat
Tank
temperature
sensor
AB –B
To the heating system
AB –A
To the tank
SpannungslosValve de-
energized
Valve
energized
3 way valve
C1C
12
Dual Aqau Stat
Overheat Stat Control Stat
E
L
N

Page 17
INSTALLATION
COMMISSIONING
Connections can come loose in transit, and all should be checked before installation.
Ensure that the immersion heater achieves a temperature of at least 60°C in the store
and that the wiring is in accordance with the diagram.
Check the pressure on the air side of the expansion vessel = 3 bar. This must be done
when the water in the cylinder is free to expand in atmospheric pressure or the cylinder
and relevant pipe work is empty.
Check that the drain cock is closed, and open all the cold and hot water taps and other
terminal ttings. Allow the system to ll with water, and to run until there is no air left
in the system. Close the taps and inspect the system closely for leaks.
Manually open the Relief Valves one by one and check that water is discharged and
run freely through the tundish and out at the discharge point. The pipework should
accept full bore discharge without overowing at the tundish, and the valve should
seat satisfactorily.
In line with good plumbing practice, use of excessive ux should be avoided.
When soldering above the cylinder, ensure ux/solder does not contaminate the
cylinder below, since this can cause corrosion, Flushing should be done performed
as per BS EN 806:4 2010 section 6.2
Allow the cylinder to heat to normal working temperature, then thoroughly ush the
domestic hot and cold water pipework through each tap.
NOTE: If this appliance is to be installed in other than a single domestic dwelling ie. in
an apartment block or student ats etc., the hot and cold water system will need to be
disinfected in accordance with BS EN 806:4 2010 section 6.3 and theWater Regulations.
Because the Aquarea appliance is stainless steel, the use of chlorine as the disinfection
agent can cause damage unless the appliance is adequately ushed and relled with
the mains water immediately on completion of the disinfection procedure. Damage
caused through a failure to do this adequately will not be covered by the warranty.
For the above reasons we recommend the use of a non chlorine dased disinfectant
such as Fernox LP Sterox as manufactured by Cookson Electronics when carrying out
disinfection of systems incorporating these appliances.
Remove the lter from the combination inlet group clean and replace. Rell the
system and open all hot taps until there is no air in the pipe work. ENSURE CYLINDER
IS DRAINED PRIOR TO CHECKING OR
REMOVING FILTER FROMTHE COMBINATION
INLET GROUP.
Allow the cylinder to heat to normal working
temperature with whatever heat source is to be
used, and check again for leaks. The Pressure
Relief Valve should not operate during the
heating cycle.
The heat pump/heating systems should be
lled and commissioned in accordance with
good practice following the guidance in BS
7593:2006/the heat pump manufacturers
instructions. This includes adequately ushing
the system to remove any debris that may
have been introduced during installation/
maintenance.
NOTE
At the time of commissioning, complete all
relevant sections of the Benchmark Checklist
located on the inside back pages of this
document.
This must be completed during commissioning
and left with the product to meet the Warranty
conditions oered by Aquarea.
IMPORTANT - DRAIN DOWN PROCEDURE
1 Switch o both the heat pump and the immersion heater
2 Open the nearest hot tap and run all hot water until cold
3 Close the incoming cold main at the stop tap
4 Hold open the pressure and temperature relief valve until water stops
discharging into the tundish
5 Open all the taps in the property
6 Open the drain cock and immediately hold open the pressure and
temperature relief valve again until the cylinder is empty

Page 18
Your Aquarea unvented cylinder is automatic in normal use, but requires routine
maintenance which is normally carried out at least annually along with the heat pump
service. The maintenance must be carried out by a suitably competent tradesperson
who is qualied to work on unvented cylinders. The checks/work needed are listed
in the maintenance part of these Instructions.
The heat pump control thermostat should turn o the switch live to the three port
valve before the heat pump starts to cycle on its internal thermostats. For example if
the maximum primary ow temperature available from the heat pump is 55°C, then
the control thermostat should be set to 48°C. (This setting should not be changed
by the occupant.)
When initially opening the taps, a small surge in ow may be experienced, which
disappears as the pressure in the system stabilises. This is quite normal with these
types of systems and does not indicate a fault.
In some areas the water will initially appear cloudy, but will quickly clear when left
to stand. This is nothing to be concerned about and is due to aeration of the water.
WARNING - If water is seen owing through the tundish, this indicates a fault condition
which needs action.
If the discharge is hot and continuous, turn the heat pump and/or the immersion
heaters o, but do not turn o the cold water to the appliance until the discharge
is cold.
Note: The discharge may stop by itself as the discharge cools.
If the discharge is cold and intermittent, no immediate action is needed but this
indicates a problem with the expansion vessel.
However, in both cases you must call the registered installer / a suitably qualied,
competent tradesperson, advise them that you have an unvented cylinder and
request a maintenance visit.
DO NOT, at any time, tamper in any way with the safety valves or overheat thermostats/
wiring.
USER INSTRUCTIONS
USER INSTRUCTIONS

Page 19
SERVICING AND MAINTENANCE
SERVICING AND MAINTENANCE
The Registered Installer is responsible for the safe installation and operation of the
system. The installer must also make his customer aware that periodic maintenance
of the equipment is essential for safety.
Maintenance periods will vary for many reasons. Aquarea recommend a maximum
of 12 months to coincide with heat pump maintenance. Experience of local water
conditions may indicate that more frequent maintenance is desirable, eg, when water is
particularly hard, scale-forming or where the water supply contains a high proportion
of solids, eg, sand. Maintenance must include the following:
1. Check and clean lter
2. Manually check the operation of the temperature relief valve.
3. Manually check the operation of the expansion relief valve.
4. Check discharge pipes from temperature and expansion relief valves are free from
obstruction and blockage and are not passing any water.
5. Check the condition and if necessary descale the heat exchangers in hard water
areas.
6. Check that water pressure downstream of pressure reducing valve is within the
manufacturers limits.
7. Check operation of motorised valve.
8. Check the pressure on the air side of the expansion vessel. This must be done
when the volume in the cylinders is cold.
9. Check and advise the householder not to place any clothing or other combustible
materials against or on top of this appliance.
10.On completion of the work, ll in the Benchmark Service Record at towards the
back of this manual.
IMPORTANT NOTE
When draining down the appliance for any reason, the instructions
provided in the Commissioning Section MUST be followed to prevent
potential damage to the cylinder.
After servicing, complete the relevant Service Interval Record section of the Benchmark
Checklist located on the inside back pages of this document.

Page 20
Scale
In hard water areas it is recommended that an in-line scale inhibitor is tted. Reducing
the temperature of the stored water will reduce the rate at which scale forms. If the
recovery rate is badly aected, this is an indication that scaling may have occurred.
In this event, follow the procedures as recommended by a reputable WaterTreatment
Company.
General
No water at the tap. Check that the mains water supply is turned ON. Check the line
strainer is not blocked. Check that the combination valve has been tted so that water
is owing in the correct direction.
If the water at the tap is cold, ensure that the boiler has been switched ON and is
working correctly. Check that there are no air locks in the primary system. ISOLATE
THE UNIT AT THE MAINS ELECTRIC SUPPLY AND THEN CHECK THE FOLLOWING:
i. The cylinder thermostat
ii. The thermal cut-out, which can be re-set by pushing the red button
iii. The motorised valve
iv. The heat pump thermostat
v. The heat pump thermostat cut-out (if tted)
ANY ENERGY CUT-OUT MUST NEVER BE BY-PASSED UNDER ANY CIRCUMSTANCES.
If the units are not getting hot and the heat source is electrical, ensure that the
immersion heaters are isolated from the mains before re-setting the energy cut-out.
If the immersion heater(s) need replacing this should be done with the units supplied
from Aquarea. See page 14 for more details.
Discharge From Relief Valves
If cold water is discharging from the expansion relief valve into the tundish check the
pressure on the expansion vessel when cold and recharge if necessary.
If the fault continues and the problem cannot be stopped by operating the easing
control a few times then either the Pressure Reducing Valve or the Relief Valve may
be at fault. If the cold water pressure is too high, this would suggest that the Pressure
Reducing Valve is at fault and the Aquarea approved replacement should be tted.
If the pressure is correct then the Relief Valve will require replacing with a Aquarea
approved component.
See Commissioning for drain down procedure.
If there is an overheat fault and very hot water is being discharged, turn o the heat
source, but not the water supply.
When the supply is cool, check thermostats and energy cut-outs in the heat pump
and immersion heaters and replace the faulty component with a unit supplied by
Aquarea and check that it works correctly before returning the system to full operation.
SERVICING AND MAINTENANCE
SERVICING AND MAINTENANCE