RECOUP Tray+ DSS-S2 User manual

Installation instructions
RECOUP Tray+ DSS-S2 (1200mm)
Shower Waste Water Heat Recover unit
These instructions are to be left with the user for the homes user pack

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Contents
SECTION PAGE
1. Introduction 3.
2. Product technical data 4 - 5.
a. General Information
b. Performance & Efficiency
c. Pressure Drop
d. Dimensions & Connections
3. Pre-installation requirements 6 -7.
a. Basic Principle
b. Installation configurations
c. Locating the WWHRU
d. Design/Installation Checklist
4. Installation 8 – 9.
a. Contents of Packaging
b. Installation instructions
5. Maintenance 10.
6. Warranty
7. Recoup Energy Solutions 10.
company details

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1. Introduction
The RECOUP Tray+ DSS-S2 (1200mm) is a Waste Water Heat Recovery Unit (WWHRU) for shower
water, meaning it recovers heat from the warm waste water as it passes through before going to the
drainage system for the property.
The heat recovery is possible, due to the copper heat exchanger within the Tray+ DSS-S2 (1200mm)
which is a very effective material for transferring heat. This preheated water then supplies the mains
cold feed to the shower and either a combination boiler or a hot water storage cylinder.
The reason for doing this is to save money and energy. In an average shower the water will come out
of the shower head at 40°C, and the water going down the drain will only be a few degrees cooler
than this. This energy has been paid for once, and we believe at Recoup Energy Solutions, that the
home owner should get as much benefit from this energy before paying to reheat more water and at
the same time reduce the energy consumption and CO2 emissions of the home.
The RECOUP Tray+ DSS-S2 (1200mm) should be installed by a suitably qualified plumber who gives
consideration and attention to the system design as well as a correct installation.
The RECOUP Tray+ DSS-S2 (1200mm) is a horizontal heat exchanger and it is very important to
follow all the instructions for installation of the RECOUP Tray+ DSS-S2 (1200mm) for the product to
perform successfully.
IMPORTANT – For recognition of the RECOUP Tray+ DSS-S2 (1200mm) energy saving performance
within the National Calculation Method (NCM) for the energy rating of a new build dwelling within
the UK, using the Standard Assessment Procedure (SAP) it is vital that the following are complied
with: -
a) This Instruction Manual
b) A system design checklist
c) Installation checklist
d) Certificate of installation
b, c & d are supplied as a single document and are attached with this document and also available
at: www.sap-appendixq.org.uk – A signed copy of each should: -
1. Be left with the home user pack (for the home owner)
2. Retained by the installer
3. A copy sent to RECOUP Energy Solutions Ltd (See company details on Page 10).
(Note: Building control officers may also request a copy)
A NCM (SAP) identifier label should be permanently fixed to the RECOUP Tray+ DSS-S2 (1200mm)
unit and a second label attached to a nearby boiler or service cupboard. The ‘model qualifier’ section
of the first label denotes the system installation configuration (A, B or C) and will state ‘Refer to
Installation certificate otherwise System B will be assumed. The actual system configuration will be
recorded on the system design checklist, installation checklist/certificate of installation and the
second NCM (SAP) identifier label.

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2. Product technical data
2. a. General Information – RECOUP Tray+ DSS-S2 (1200mm)
Description Value Unit
Minimum depth required for installation 150 mm
Overall Width/Length required for installation 900 x 1200 mm
Material – Heat exchanger Copper
Shower flow rate range 5 – 12.5 L/m
Max. Mains water inlet pressure 10 bar
Min. Mains water inlet pressure 1 bar
Max. Waste water working temp. 85 °C
Mains water connection 1/2 Inch
Waste water connection 40 mm
Weight of Exchanger 2.7 kg
Water volume – mains water 0.67 Litres
2. b. Performance & Efficiency
Shower Flow Rate
@ 40°C (Litres/min)
Tray+ DSS-S2 (1200mm) efficiency (Recovered energy kWh)
System A System B System C
9.0 46.3 % (8.7) 36.5 % (6.9) 41.9 % (7.9)
9.2 45.8 % (8.8)
11.0 45.4 % (10.4) 36.5 % (8.4) 40.6 % (9.3)
12.5 45.2 % (11.8)
2. c. Pressure drop on main water circuit
Shower Flow Rate @
40°C (Litres/min)
Tray+ DSS-S2 (1200mm) Pressure drop (bar)
System A System B System C
9.2 0.31 <0.19
12.5 0.50 <0.30

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V1.02
2. d. Dimensions & connections – RECOUP Tray+ DSS-S2 (1200mm)
1 Waste Water Connection
2 Cold Water In
3 Pre-heated water Out
Fig. 1. Dimensions & Connections
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 
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144

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V1.02
3. Pre-installation requirement
3. a. Basic system principle
The RECOUP Tray+ DSS-S2 (1200mm) is a Waste Water Heat Recovery Unit (WWHRU) for shower
water, meaning it recovers heat from the warm waste water from a shower as it passes through
before going to the drainage system for the property.
This preheated water then supplies the mains cold feed to the shower and the Domestic Hot Water
(DHW) heater or in the case of system configurations System B and System C, the shower or the
DHW heater respectively. The DHW heater could be: -
a) Unvented hot water cylinder
b) a combination boiler
c) a thermal store (Mains pressure DHW delivery)
d) A Heat Interface Unit (HIU) on a district heating scheme (Mains pressure DHW delivery)
Note: The DHW heater must be a mains pressure system and able to accept preheated cold water.
3. b. Installation configuration
The inlet for the Recoup Tray+ DSS-S2 (1200mm) is connected to the mains water supply, and the
outlet (pre-warmed water) can be connected in one of three ways: -
A B C
Fig. 2. System A,B & C Configuration
SYSTEM A – Preheated water supplied to shower mixer (Cold inlet) and DHW heater.
SYSTEM B – Preheated water supplied to shower mixer (Cold inlet) on the shower only
SYSTEM C – Preheated water supplied to DHW heater only
The performance of Systems A, B & C are all recognised within the SAP Products Characteristics
Database (PCDB) for energy saving calculations, but remember that System A will produce the
highest efficiencies (see section 2.b. for different system efficiencies).

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V1.02
3. c. Locating the RECOUP TRAY+ DSS-S2 (1200mm)
The RECOUP Tray+ DSS-S2 (1200mm) needs to be installed horizontal. Installation should
take place on a flat base capable of supporting the WWHRU using the fixings provided, and
should allow for access to all parts and routine maintenance (E.g. Cleaning) to be carried out
with relative ease.
The RECOUP Tray+ DSS-S2 (1200mm) must be located within the heating envelope of the building.
The Tray+ DSS-S2 (1200mm) must be installed with consideration to the most recent ‘Approved
document – Part H of the Building Regulations’ for preventing the ingress of foul sewer gases.
3. d. Design Checklist
For recognition within the SAP calculations, the following must be complied with:-
 Consideration given to DHW delivery performance (Pressure & Flow rate)
 DHW system must be a mains pressure system
 DHW system must accept preheated water
 The RECOUP Tray+ DSS-S2 (1200mm) must be located within the heating envelope of the
building.
 The shower must be fitted with a Thermostatic Mixing Valve
 Keep the distance from the shower waste outlet to the WWHRS to within 3m to maintain a
high level of efficiency (With the Recoup Tray+ DSS-S2 (1200mm), the exchanger is built into
the tray, so distance is not an issue) by minimising heat losses in the drainage system prior
to the WWHRS.
 The Preheated water supply from the RECOUP Tray+ DSS-S2 (1200mm) to the shower cold
water inlet and water heater must be: -
o Insulated in accordance with the ‘Building Services Compliance Guide’.
DO NOT INSULATE THE ACTUAL RECOUP TRAY+ DSS-S2 (1200mm)
o Labelled to prevent any future connection of hot water take-off points (E.g. Taps).
 Prevent the RECOUP Tray+ DSS-S2 (1200mm) being heated above 25°C by both external
sources and from ambient temperature.
 If shut-off valves are specified they should be ‘full-flow (non-restricting) shut-off valves.
 Approved document – Part H of the Building Regulations has been consulted and an
appropriate method for preventing the ingress of foul sewer smells chosen.
 Consideration must be given to point 6. In section 4.b, with regards to ventilation of the
trap.

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4. INSTALLATION
4. a. Contents of Packages
Table 1 – Contents of packaging
]
Box Part No. Qty. Name
1
1 1 RECOUP Tray+ DSS-S2 (1200mm)
WWHRS unit – 900 x 1200 mm
1 2 1 50mm reducer to 40mm (Solvent)
1 3 1 Installation instructions
1 4 1 NCM (SAP) Identifier label for nearby
boiler or service cupboard.
1 5 1 Design checklist
1
6 1 Installation checklist

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V1.02
4. b. Installation of the RECOUP Tray+ DSS-S2 (1200mm)
Check section 3. c. for guidance on locating a suitable area for installation.
The unit must be installed horizontally on a suitable flat surface which is capable of holding the
weight of the unit. If the mounting is not horizontal the efficiency of the unit could be reduced, and
installation should always be within a tolerance of +/- 2mm.
To mount the unit: -
1. Use the adjustable feet on the Recoup Tray+ DSS-S2 (1200mm) to ensure the unit is in a level
horizontal position in all directions, providing an even distribution of weight across all legs.
2. Use the lock nuts on the legs to fix the Tray+ DSS-S2 (1200mm) position.
3. Connect to the water supply; ensure a 1/2” Female BSP x 15mm connection is used (Not
supplied). Remember the lowest connection is the cold water inlet, and the highest
connection is the preheated water to be connected to the shower’s cold water inlet and/or
water heater (Depending on installation configuration).
The Recoup Tray+ DSS-S2 (1200mm) is supplied with flexible PEX hoses to aid with
installation. If these hoses are removed/replaced ONLY copper pipe or PEX hose should be
used and NEVER EPDM hose
4. A non-return valve with full flow shut off valve (Not supplied) should be installed on the
mains water supply prior to the WWHR unit in an accessible location. It is also
recommended that an additional full flow shut-off valve (Not supplied) is installed close to
the connection for the pre-heated water leaving the WWHRU to facilitate in any
replacement of parts.
5. Connect the shower waste outlet (50mm Ø) to the sewer, using the 50mm reducer (to
40mm) socket.
6. The Recoup Tray+ DSS-S2 (1200mm) is a single walled exchanger, and therefore a shower
trap should be installed after the unit to form an air break, or alternatively a HepV0 valve
can be installed to minimise the depth required. IMPORTANT – THE TRAP MUST BE VENTED
UPSTREAM.
7. Check that the unit is in a horizontal position.
8. Check and complete the following: -
a. Ensure the preheated water supply is only feeding the DHW water heater and the
cold water inlet of the shower’s thermostatic mixing valve (System A), the cold inlet
of the shower’s thermostatic mixing valve only (System B) or the water heater only
(System C).
b. The preheated water supply from the Tray+ DSS-S2 (1200mm) is clearly labelled to
avoid future connections of other services.
c. Pipework between the Tray+ DSS-S2 (1200mm) and the water heater and/or cold
water inlet of the thermostatic mixing valve is insulated.
9. Waterproof the shower tray as normal with a suitable waterproof sealant.

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5. Maintenance
The maintenance required for the RECOUP Tray+ DSS-S2 (1200mm) is very minimal, however, it is
recommended to clean the unit periodically to avoid any reduction in efficiency. This cleaning will
remove any build-up of soap and dirt residue on the inside of the copper pipe where the waste
water passes. To clean, lift the lid and clean with soup and warm.
Once cleaned, replace the lid and rinse through with warm water from the shower.
6. Warranty
The Recoup Tray+ DSS-S2 (1200mm) comes with a 2 year warranty, which starts from the date of
invoice from Recoup Energy Solutions Ltd.
This warranty is conditional on the product being installed in accordance with these
instructions (Installation and ALL requirements for SAP, if product is to be recognised for
Energy efficiency calculations), correct plumbing practices and Building Regulations.