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Central Heating Part 1


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Central Heating Part 1 plumbing revision to be done with exams at

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Central Heating Part 1

  2. 2. • Having a Level 2 Certificate limits you to install pipework systems ( the wet side) and you should not work on gas appliances or gas pipework. • Therefore in the central heating subject we will look at the regulations, systems and components. PRACTICE PLUMBING EXAMS © WWW.PRACTICEPLUMBINGEXAMS.COM
  3. 3.  These are no longer installed but you may have to decommission these systems from time to time.  They were referred to as background heating in domestic properties : A radiator, for example in the bathroom, which would have been fed from the primary flow and return pipe from the boiler.  The Flow and-return to the radiator was usually 22 mm on solid fuel boilers it had to be a 28mm, the pipe work had to be put on the correct fall & rises to allow for circulation (hot water rises / cold water falls).  This system worked on the principles of large diameter pipe work with the correct falls & rises as no pump was installed in the system. PRACTICE PLUMBING EXAMS © WWW.PRACTICEPLUMBINGEXAMS.COM
  4. 4. •This system works with a one pipe making a circuit from the flow outlet and retuning to the boiler return point. •This system is not economical and no longer installed. PRACTICE PLUMBING EXAMS © WWW.PRACTICEPLUMBINGEXAMS.COM
  5. 5. Advantages Lower installation Quick to install Low maintenance costs Disadvantages As the water passes through the system the water gets cooler after each radiator. Therefore the last radiator in the circuit was the coolest You would have to select low frictional resistance radiators and selected fittings as the pump would only circulate the water around the circuit and not directly through the radiators. To improve circulation the flow side would enter the radiator at high level, leaving exposed pipework which was unsightly. PRACTICE PLUMBING EXAMS © WWW.PRACTICEPLUMBINGEXAMS.COM
  6. 6. • Careful balancing of the radiators is a must. • The radiators at the end of the circuit would have to be bigger than those at the beginning. • To radiators needed to be placed near the main circuit to allow correct operation. PRACTICE PLUMBING EXAMS © WWW.PRACTICEPLUMBINGEXAMS.COM
  8. 8.  This was a popular system to install.  Under part L regulations this is longer permitted to be installed in new properties.  In a two-pipe system, there is two pipes that run around the circuit a flow and a return. This increases the heat up time on in the radiators.  You balance the system by adjusting the lock shield valve on each radiator. First radiator closed the most the last radiator closed the least. PRACTICE PLUMBING EXAMS © WWW.PRACTICEPLUMBINGEXAMS.COM