General Installation Requirements - Baxi 748 Installer's Manual

The efficiency of this appliance has been measured as specified in BS 7977 - 1 and the
result is 63 % (Gross). The gross calorific value of the fuel has been used for this
efficiency calculation. The test data from which it has been calculated has been certified
by Advantica Certification services (0087). The efficiency value may be used in the UK
Government's Standard Assessment Procedure (SAP) for energy rating of dwellings.
The conversion of net efficiency to gross was achieved by multiplying the net
efficiency by the following conversion factor from Table E3 of SAP 2005, rounding
down to the nearest whole number.
Gas
Natural Gas
LPG

3. GENERAL INSTALLATION REQUIREMENTS

3.1 The installation must be in accordance with this guide.
For the user's protection, in the United Kingdom it is the law that all gas appliances are
installed by competent persons in accordance with the current edition of the Gas Safety
(Installation and Use) Regulations. Failure to install the appliance correctly could lead
to prosecution. The Council for the Registration of Gas Installers (CORGI) requires its
members to work to recognised standards.
In the United Kingdom the installation must also be in accordance with:
All the relevant parts of local regulations.
All relevant codes of practice.
The relevant parts of the current editions of the following British Standards: -
BS 715
BS EN 1856 Part 1
BS EN 1858 which replaces BS 1289 Part 1
BS EN 1806 which replaces BS 1289 Part 2
BS EN 1856 Part 1 which replaces BS 4543 Part 2
BS 5440 Part 1
BS 5440 Part 2
BS 6461 Part 1
BS 1251
BS EN 1806
BS 5871 Part 2
BS 6891
©
Baxi Heating U.K. Limited 2006.
INSTALLER GUIDE
Conversion factor from net to gross efficiency
Page 7
0.901
0.921