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Central Heating Part 2

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Central Heating Part 2 plumbing revision to be done with exams at www.prcaticeplumbingexams.com

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Central Heating Part 2

  1. 1. Building Regulations and central-heating PRACTICE PLUMBING EXAMS © WWW.PRACTICEPLUMBINGEXAMS.COM
  2. 2. By the end of this section you should understand: • Why there are Regulations for domestic heating systems • How systems can be installed to comply with the Regulations • How to upgrade existing installations. PRACTICE PLUMBING EXAMS © WWW.PRACTICEPLUMBINGEXAMS.COM
  3. 3. • The Building Regulations 2000 deals with the conservation of fuel and power in an approved document. • This is Appro ve d Do cum e nt L1 : Co nse rvatio n o f fue land po we r. PRACTICE PLUMBING EXAMS © WWW.PRACTICEPLUMBINGEXAMS.COM
  4. 4. This document sets out requirements for: • zone control • Boilercontrol interlocks • Timing controls • Alternative approaches forspace heating and hot-watersystems hot-water systems • Operating and maintenance instructions forheating and hot-watersystem controls • Space-heating systems controls • commissioning of heating and hot-watersystems PRACTICE PLUMBING EXAMS © WWW.PRACTICEPLUMBINGEXAMS.COM
  5. 5. • The legislation sets out ways for improving energy conservation in dwellings by improving the control of a system. • Using temperature control to individual rooms. • Only permitting the most energy efficient boilers to be installed. • Prohibiting the installation of gravity circulation systems in new properties. PRACTICE PLUMBING EXAMS © WWW.PRACTICEPLUMBINGEXAMS.COM
  6. 6. • The next system we will look at is designed to bring controls up to Building Regulation specifications for work on existing systems such as boiler replacements. PRACTICE PLUMBING EXAMS © WWW.PRACTICEPLUMBINGEXAMS.COM
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  8. 8. • The hot water and the heating circuits are fully pumped. • Therefore, no gravity circulation • The boiler can be sited higher than the cylinder, giving more installation design options. • The system is controlled by motorised valves known as 2 port valve and 3 port valve • You can use 2 x 2 port valves known as the S plan or use 1, 3 port valve known as the Y plan • Any new system in a domestic property, other than one using a continuous-burning appliance, should be fully pumped PRACTICE PLUMBING EXAMS © WWW.PRACTICEPLUMBINGEXAMS.COM
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  10. 10. • There are two types of 3 port valves. • 3 port valve 2-position. • 3 port valve mid position. PRACTICE PLUMBING EXAMS © WWW.PRACTICEPLUMBINGEXAMS.COM
  11. 11. • This was one of the first fully pumped systems to be installed. • However it is no longer widely used. • This system is designed to provide independent temperature control of the heating and hot-water circuits • When used with a programmer, satisfies the Building Regulations. PRACTICE PLUMBING EXAMS © WWW.PRACTICEPLUMBINGEXAMS.COM
  12. 12.  The 2-position 3 port valve can only supply the central heating or hot water circuit at one given time, it is installed to give priority to the hot water.  This valve should not be installed were there is a high demand of hot water in the colder times of the year when the heating is required. As the valve gives priority to the hot water.  The heating temperature would drop and may become below the comfort level when the demand for hot water is high for long periods of time. PRACTICE PLUMBING EXAMS © WWW.PRACTICEPLUMBINGEXAMS.COM
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  14. 14. • This type of system can be installed in new domestic properties. • The system allows separate temperature and time control of the heating and domestic hot-water circuits. • To meet the building regulations part L the system must have Thermostatic Radiator Valves (TVR), an automatic bypass and the time control must be through a programmer to allow more control. • The mid-position valve will permit both hot water and heating circuits to operate together. PRACTICE PLUMBING EXAMS © WWW.PRACTICEPLUMBINGEXAMS.COM
  15. 15. • This type of system is installed in large new domestic properties. • This system is recommended for use in houses (dwelling) with a floor area greater than 150m2. • The use of the 2 × 2 port valves will allow for the house central heating system to be “zoned” with additional valves, giving more flexibility. • • The system Has separate temperature control for both heating & hot water circuits. PRACTICE PLUMBING EXAMS © WWW.PRACTICEPLUMBINGEXAMS.COM
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