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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).
