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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