Table Of Contents; Installation Regulations; Introduction - Worcester 24ijunior Installation And Servicing Instructions

Contents
1. Installation Regulations . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 2
3. Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 5
4. Siting the Appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8
5. Flue Terminal Positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 8
6. Air Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9
7. Sealed System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9
8. Open Vent System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 9
9. Domestic Hot Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10
10. Gas Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10
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1. Installation Regulations

The appliance is suitable for installation in GB and IE only and
should be installed in accordance with the rules in force.
1.1 Gas Safety (Installation & Use) Regulations 1998:
It is the law in GB that a competent person in accordance with
the above regulations installs all gas appliances.
Failure to install appliances correctly could lead to prosecution.
It is in your interest, and that of safety, to ensure compliance
with the law.
1.2 The manufacturers notes must not be taken, in any way, as
overriding statutory obligations.
1.3 The compliance with a British Standard or European Norm
does not, in itself, confer immunity from legal obligations.
1.4.1 The installation of the appliance must be in accordance
with the relevant requirements of the Gas Safety Regulations,
current IEE Regulations, Building Regulations, Building Standards
(Scotland) and local water by-laws.
1.4.2 In Eire, the installation must be carried out by a competent
person and installed in accordance with IS813, Domestic Gas
Installations (Edition 2), the current Building Regulations and the
electrical installation must follow the ETCI rules.
1.5 The installation should follow the recommendations of the
following British Standards unless otherwise indicated.
BS5440:1 - Flues and ventilation for gas appliances: Flues
BS5440:2 - Flues and ventilation for gas appliances: Air supply.
BS5449 - Central heating for domestic premises.
BS5482 - Domestic propane gas burning installations.
BS5546:1 - Installation of gas hot water supplies.
BS6700 - Domestic water supply in buildings.
BS6798 - Installation of gas fired hot water boilers.
BS6891 - Low pressure gas pipework installations upto 28mm
(R1).
BS7593 - Water treatment.
BS7671 - Requirements for electrical installations (16th Edition).
British Standards and Regulations are not in force in Ireland,
however useful information relating to the hydraulic aspects of
heating systems may be found in IS 813: Annex M and in
BS5546, BS5449, BS7074 and BS7593.
1.6 The appliance and components must conform, where
applicable, to all relevant Directives.
1.7 The appliance does not contain any substances which are
harmful to health.
1.8 In certain circumstances, the installer can be held
responsible, not only for mistakes on his part but also for
damage resulting from the use of faulty materials. We advise
that, to avoid any risk, only quality approved branded fittings
and the specified replacement parts are used.
11. Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 10
12. Installing the Appliance . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13
13. Commissioning the Appliance . . . . . . . . . . . . . . . . . . . . Page 20
14. Handover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 22
15. Inspection and Service. . . . . . . . . . . . . . . . . . . . . . . . . . . Page 22
16. Replacement of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 25
17. Short Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 31
18. Operational Flow Diagrams. . . . . . . . . . . . . . . . . . . . . . . Page 33
19. Fault Finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 35
20. Conversion Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . Page 43
1.9 LPG Installation:
The appliance shall not be installed in a room or internal space
below ground level when it is intended for use with LPG. This
does not preclude the installation into rooms, which are
basements with respect to one side of the building but open to
the ground on the opposite side.
1.9.1 CARAVAN AND HOLIDAY HOMES
The installation must meet the following standards.
BS5482:2 LPG and EN721 ventilation.
1.9.2 PARK HOMES AND RESIDENTIAL
The installation must meet the following standards.
BS5482:1 LPG and BS3632 ventilation.
1.10 These instructions cover, as far as possible, the foreseeable
situations, which may arise.
Contact Worcester Heat Systems Technical Department,
Telephone: 08705 266241, for advice on specific installations.
In Eire call 01 494 0099.

2. Introduction

2.1 The Benchmark initiative is the new code of
practice to encourage the correct installation, commissioning and
servicing of domestic central heating boilers and system equipment.
The 'Log-book' is a vital document that must be completed
by the installer at the time of installation. It confirms that the
boiler has been installed and commissioned according to the
manufacturers instructions.
A Declaration of Conformity (refer to IS813 Annex D 1) must
be completed by the installer and a copy supplied to the
appliance operator for boilers installed in Eire.
Without the completion of the Log-book and/or Declaration,
manufacturers may refuse to respond to a call-out from a
householder, who will be advised that he or she must call back the
installer, who has not fulfilled his obligations to record the
information required by the initiative.
Service:
To ensure the continued efficient operation of the appliance it must
be checked at regular intervals. The frequency of servicing will
depend upon the particular installation conditions and usage, but
once per year should generally be adequate. The extent of the
service required by the appliance is determined by the operating
condition of the appliance when tested by fully qualified engineers.
Any service work must be carried out by competent registered
(by CORGI in GB) engineers.
2.2 General Information
The appliance is set to give the maximum output of 27.5 kW [28i] or
23.5kW [24i] to the domestic hot water and to the heating system.
The hot water flow rate is limited to a nominal 10 l/min [28i] or 8
l/min [24i] at a maximum temperature rise of 40°C.
The sanitary water section of the appliance is suitable for a mains
water pressure of up to 10bar.
An internal filling loop assembly approved by the WRAS is an
optional extra.
The 28i is only manufactured for use with Natural Gas.
Kits are available for the 24i and 28i appliances to convert from
Natural Gas to LPG operation and vice versa.
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