Alpha Eco-X Instructions for Installation

Instructions for Installation

Alpha Plus DH Units for Domestic Hot

Water and Direct Central Heating

Alpha Therm Ltd
Nepicar House
London Rd
Wrotham Heath
Kent
TN15 7RS

Leave these instructions with the User

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 Forced circulation hot water system
BS 5546: 2000 Installation of hot water supplied for domestic purposes
BS 6700: 1997 Design, installation, testing and maintenance of services supplying water
BS 7983: 1992 Code of Practice for treatment of water in heating systems
BS 7671: 2001 Requirements for electrical installations, IEE Wiring Regulations

Note: Manufacturer’s instructions must NOT be taken in any way as over-riding statutory obligations

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2/

TECHNICAL DATA

2.1

District Heating Circuit and Direct Central Heating
Max Working Pressure 8 bar

Min Working Pressure 1 bar
Max Flow Temperature 95°C
Max Differential Pressure 4 bar
Flow connection 22mm
Return connection 22mm

2.2

Secondary Circuit (Domestic Hot Water)
Max Working Pressure 8 bar

Min Working Pressure 0.2 bar
Heat Output to water (approx) 20 to 28kW
DH circuit flow rate reqd for max output 15 to 20 l/min
Max Flow Rate at 35°C rise (approx) 12 l/min
Min required Flow Rate 2.5 l/min
Adjustable Outlet temperature up to 60°C
Max Outlet Temperature (approx) 62°C
Mains inlet connection 15mm
DHW outlet connection 15mm

2.3

Components
Heat Exchanger Stainless Steel 23 plates

Hot Water Thermostatic Valve Brass body with removable t/sensor
CH/DHW on/off 2-way Valve Brass body with removable actuator
DHW Flow Switch with Strainer Nylon with ½” Brass connection

Strainer for DH and CH Brass 22mm comp with S/S filter
DH/CH Isolation Valves Brass 22mm comp.
Cold Water Inlet Valve Brass 15mm comp

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2.4 Electrical

Supply – 230/240V – 50 Hz

External fuse - 3 A

Power Consumption – 6W

2.5

Installation

Dimensions of assembled Unit Height 500mm

(Including Cover) Width 300mm

Depth 220mm

Min clearances required Top 5mm

Bottom 200mm

Sides 5mm

Front 450mm

Assembled weight of Units DHW1 7.4kg
DCH1 1.4kg

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2.6 Schematic Diagram

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