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Alpha HE25 and HE33 - Contents/Introduction
CONTENTS
1 Introduction ....................................... 2
2 Technical data................................... 3
3 General boiler information.................. 6
4 Installation ......................................... 12
5 Commissioning ................................. 18
6 Boiler operation ................................. 23
7 Routine servicing ............................... 22
8 Component replacement ................... 26
9 Wiring diagrams ................................ 31
10 Fault finding ...................................... 33
11 Short parts list ................................... 38
12 Benchmark Checklist ........................ 39
13 Service record ................................... 40
The Alpha HE range of high efficiency condensing boilers are wall mounted, fan assisted room-sealed boilers. The burner is lit
electronically and the heat output is controlled by a modulating gas valve.
The HE25 and HE33 are combination boilers providing both central heating and domestic hot water at mains pressure.
The boilers are supplied with a pump, pressure relief valve, expansion vessel and pressure gauge fully assembled and tested.
They are designed for use with a fully pumped, sealed and pressurised central heating system using only Natural gas.
The HE25 boiler is suitable for central heating loads of between 14.5 and 25.0 kW (49 500 and 85 300 Btu/h).
The HE33 boiler is suitable for central heating loads of between 19.7 and 33.2 kW (67 200 and 113 300 Btu/h).
The maximum output available for domestic hot water is 25.0 kW (85 300 Btu/h), capable of providing 9.9 litres/min with a
temperature rise of 35°C for the Alpha HE25 boiler and for the Alpha HE33 boiler - 33.2 kW (113 300 Btu/h), providing 13.2
litres/min with a temperature rise of 35°C.
IMPORTANT
It is the law that all gas appliances are installed by a competent person, i.e. CORGI registered personnel, in accordance with
the following recommendations:-
Current Gas Safety (Installation and Use) Regulations
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)
The installation should also be in accordance with the following British Standard Codes of Practice:-
BS 5440:1:2000 Flues
BS 5449:1990 Forced circulation hot water systems
BS 5546:2000 Installation of hot water supplies for domestic purposes
BS 6700:1997 Design, installation, testing and maintenance of services supplying water
BS 6798:2000 Installation of gas fired hot water boilers
BS 6891:1998 Gas installation
BS 7593:1992 Code of Practice for treatment of water in heating systems
BS 7671:2001 Requirements for electrical installations, IEE Wiring Regulations
Reference should also be made to the DEFRA document 'Guide to condensing boiler installation assessment procedure for
dwellings'
If installation is in a timber framed building, refer to the Institute of Gas Engineers document IGE/UP/7.
This appliance meets the requirements of IPX4D, i.e. degree of protection against moisture.
Failure to install this appliance correctly could lead to prosecution. It is in your own interest and that of safety to ensure that the
law is complied with.
Manufacturer's instructions must NOT be taken in anyway as over-riding statutory obligations.
Notes: 1. Ensure that the Benchmark Checklist has been completed after the boiler has been installed and commissioned.
2. The boilers MUST only be used with Alpha CD condensing flue components.
1 INTRODUCTION
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