PLUMBING

Presentation on

Central Heating

Forced circulation through loop pipework only

Central Heating – Types of systems (Part 1) - One pipe system

Circulation through radiator is forced

Central Heating – Types of systems (Part 1) – Two pipe system

No independent temp control of HW on gravity system

Central Heating - Semi gravity system

Open ventCold FeedCold Feed to Cylinder

Gravity primary pipework

Pumped Heating pipework

Anti gravity valve (page 6)

Building regulations Approved Document L

Approved Document L covers central heating•

Why do we need legislation for central heating ?

To help combat global warming .. but what is the cause of global warming?

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It is CO² being released in to the atmosphere•

The Government is committed to reducing the amount of CO² we release in to the atmosphere each year.

Share of CO² Emissions for 2000

Central Heating

Transport 28%

Domestic 26%

Agriculture 1%

Public 15%

Other 4%

Business 26%

Building regulations Approved Document L

What does this document set out to then ? … it makes many changes to the way buildings are built but the ones that concern us as plumbers the most are :

Replacement of heating systems (including boilers and hot water storage cylinders).

Heating and hot water controls

Commission of heating systems and the provision of instructions for users.

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Central Heating

Building regulations Approved Document L

SEDBUK rating of boilers Seasonal Efficiency Domestic Boilers in UK

1st April 2002 minimum rating was band D

1st April 2005 minimum rating is now band A or B

SEDBRUK rating has been specifically designed for the SAP energy rating Standard Assessment Procedure

Central Heating – Types of systems (Part 1)

Zone valve controlled by stat fitted in return to keep open vent clear

Injector tee fitted here for pumped heating return connecting into gravity return for alternative return connection.

No temp control of HW on gravity system

Central Heating - Semi gravity system