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Alpha CD25X User Manual

Alpha CD25X
40 pages
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Installation and Servicing
Instructions
Alpha CD25X/28X
Range of Wall Mounted, Fan Assisted, Room Sealed,
Gas Fired, High Efficiency Condensing Combination Boilers
Alpha CD25X G.C. No. 47 532 39
Alpha CD28X G.C. No. 47 532 37
British Gas
Service Listed
For use with Natural Gas only
Leave these instructions with the User
Nepicar House, London Road,
Wrotham Heath, Sevenoaks,
Kent TN15 7RS
For Technical help or for Service call ...
ALPHA HELPLINE
Tel: 0870 3001964
0051
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Alpha CD25X Specifications

General IconGeneral
BrandAlpha
ModelCD25X
CategoryBoiler
LanguageEnglish

Summary

2 Technical Data

2.1 Natural Gas Performance

Details performance specifications for natural gas operation.

2.5 Installation Clearances and Dimensions

Covers clearances, dimensions, and mounting requirements for installation.

2.7 Performance Data

Presents key performance data including efficiency and NOx class.

2.8 Flue System Lengths

Specifies flue lengths, bends, and extensions for safe installation.

2.9 Available Pump Head for Central Heating

Provides data on pump head availability for central heating outputs.

2.10 Electrical Connections

Details wiring requirements, including earthing and clock connections.

2.11 Boiler Component Schematic

Diagram illustrating the boiler's internal components and their connections.

3 General Boiler Information

3.4 Flue System Installation Guide

Guidance on flue system installation, types, and lengths.

3.5 Flue Terminal Location

Specifies regulations for flue terminal positioning to ensure safety and prevent nuisance.

3.7 Central Heating System Design

Details the design and components of the central heating system.

3.8 Filling the Central Heating System

Instructions for filling and pressurizing the central heating system.

3.9 Flushing the Heating System

Procedures for cleaning and flushing the heating system before and after installation.

3.11 Domestic Hot Water System

Details requirements for the domestic hot water system, including flow rates and pressure.

4 Installation

4.4 Fit the Boiler

Procedure for fitting the boiler onto the mounting bracket.

4.5 Pipework Connections

Instructions for connecting the central heating and hot water pipework.

4.6 Fitting the Flue Assembly

Procedure for fitting the CD Easy-Flue, including length calculations.

4.7 Extending the Flue

Guidance on extending the flue length beyond standard limits.

4.8 Connect the Mains Supply

Instructions for connecting the boiler to the mains electrical supply.

5 Commissioning

5.1 Fill the System

Steps for filling and venting the central heating system.

5.3 Gas Tightness and Purge Test

Procedures for testing gas supply tightness and purging the system.

5.4 Initial Boiler Lighting Procedure

Steps for the initial lighting of the boiler.

7 Routine Servicing

8 Component Replacement

9 Wiring Diagrams

9.1 Boiler Wiring Diagram

Diagram showing the electrical connections and layout of the boiler.

9.2 Functional Flow Wiring Diagram

Illustrates the functional flow of electrical signals within the boiler.

10 Fault Finding

10.1 Initial Fault Finding Checks

Initial checks to perform before diagnosing specific faults.

10.2 Central Heating Fault Finding

Troubleshooting guide for central heating mode operation.

10.3 Domestic Hot Water Fault Finding

Troubleshooting guide for domestic hot water mode operation.

10.4 Fault Finding Solutions A-D

Detailed solutions for faults A through D, with diagnostic steps.

10.5 Fault Finding Solutions E-K

Detailed solutions for faults E through K, with diagnostic steps.

12 Benchmark Installation Checklist

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