Page 531 - The City and Guilds Textbook: Plumbing Book 1 for the Level 3 Apprenticeship (9189), Level 2 Technical Certificate (8202) and Level 2 Diploma (6035)

Chapter 7 Central heating systems

10 What component is shown in the image below?

a Underfloor heating manifold
b Expansion relief valve
c Low loss header
d Boiler cascade system
11 Describe a boiler interlock and its purpose.
12 What are the names of the two types of fully pumped vented system that
can be installed?
13 What is the purpose of inhibitor within a CH system?
14 Explain why a filling loop should be disconnected after initial filling of the
system.
15 Where should drain valves be installed within a central heating system?

Practical activity

As a trainee or apprentice plumber it is important that you are able to
position and fix (hang) a radiator. This may be a typical task an apprentice
is asked to carry out on a regular basis. Develop your confidence by marking
out for the installation of a given radiator.
You will need to ask your supervisor or tutor for a radiator to work from,
and a space to mark and measure. Using the theory you have discussed at
your training centre, measure the radiator/brackets and transfer the relevant
marks onto a surface for fixing your brackets.
Ask your supervisor or tutor to check this work. If possible and convenient,
perhaps you could select suitable fixings and continue to hang the radiator.
Again, ask your supervisor or tutor to check once complete.

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