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Alpha CD12S/20S/28S - Contents/Introduction
CONTENTS
1 Introduction ........................................2
2 Technical data ...................................3
3 General boiler information .................7
4 Installation .........................................14
5 Commissioning ..................................22
6 Boiler operation .................................25
7 Routine servicing ...............................26
8 Component replacement ...................29
9 Wiring diagrams ................................35
10 Fault finding .......................................37
11 Short parts list ...................................40
12 Benchmark Checklist .........................41
13 Service record ...................................42
The Alpha CD range of high efficiency condensing boilers are wall mounted, fan assisted room-sealed system boilers. The
burner is lit electronically and the heat output is controlled by a modulating fan and gas valve.
These are system boilers providing heating only for sealed central heating systems.
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 CD12S boiler is suitable for central heating loads of between 2.4 and 12.8 kW (8 200 and 43 650 Btu/h).
The CD20S boiler is suitable for central heating loads of between 3.3 and 19.5 kw (11 260 and 66 500 Btu/h).
The CD28S boiler is suitable for central heating loads of between 5.4 and 30.1 kw (18 420 and 102 700 Btu/h).
IMPORTANT
It is the law that all gas appliances are installed by a competent person, ie Gas Safe 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 Flues
BS 5449: Forced circulation hot water systems
BS 5546: Installation of hot water supplies for domestic purposes
BS 6700: Design, installation, testing and maintenance of services supplying water
BS 6798: Installation of gas fired hot water boilers
BS 6891: Gas installation
BS 7593: Code of Practice for treatment of water in heating systems
BS 7671: Requirements for electrical installations, IEE Wiring Regulations
Reference should be made to DEFRA document 'Guide to condensing boiler installation assessment procedures 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, ie degree of protection against moisture.
This appliance contains no asbestos and no substances have been used in the construction process that contravene the
COSHH Regulations (Control of Substances Hazardous to Health).
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. It is the law that all boiler installations are registered by the installer through the Gas Safe Gas Work Notification
Scheme.
3. The boiler must only be used with Alpha CD condensing flue components.
1 INTRODUCTION
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