Alpha Plus DH Units Instructions For Installation Manual page 2

1/ INTRODUCTION
The Alpha Plus district heating units are hydraulic units designed for various
heating applications within individual domestic dwellings served by a district heating
scheme. The units are:-
(i) Domestic Hot Water Unit – Model DHW (Part No 6.3000100)
This unit provides instantaneous hot water indirectly from a district heating
circuit via a plate heat exchanger. The main components are pre-assembled
mounted on a back panel. Isolation valves and strainer are supplied with wall
fixings and thermostat sensor.
(ii) Direct Central Heating Unit – Model DCH (Part No 6.3000200)
This unit must be used in conjunction with the DHW Unit and will provide
central heating to the dwelling directly from the district heating circuit. The
central heating radiators used must be suitable for at least 8 bar working
pressure.
Note: Differential pressure control valves and an automatic by-pass valve for
fitting to the district heating circuit are not provided in the above units and
need to be supplied by the installer.
An optional outer cover (Part no 6.3000400) enclosing the main components of the DHW
unit is available, if required.
The above district heating units comply with the following requirements:
Electrical requirements of BS EN60335 – 1
EMC requirements of BS EN55014 – 2, BS EN50081 – 1, BS EN61000 - 3 - 2 / 3
UK Water Regulations / Byelaws (Scotland)
Northern Ireland Water Regulations
IMPORTANT
The installation should be in accordance with the following British Standards and requirements:
All current Building Regulations issued by the Department of the Environment, i.e. Approved
Document L1
Building Standards (Scotland) (Consolidation) Regulations issued by the Scottish Development
Department
UK Water Regulations/Byelaws (Scotland)
Health & Safety Document No. 635 (The Electricity At Work Regulations 1989)
BS 5449: 1990
BS 5546: 2000
BS 6700: 1997
BS 7983: 1992
BS 7671: 2001
Note: Manufacturer's instructions must NOT be taken in any way as over-riding statutory
obligations
Forced circulation hot water system
Installation of hot water supplied for domestic purposes
Design, installation, testing and maintenance of services supplying water
Code of Practice for treatment of water in heating systems
Requirements for electrical installations, IEE Wiring Regulations
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