Page 445 - 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 6 Hot water systems

12 Explain the purpose of a secondary return circuit.
13 Name two types of shower pump.

14 A cylinder measures 1050 mm in height and has a diameter of 350 mm.
What is its capacity?
15 What is the purpose of the sacrificial anode within a hot water system?

Practical activity
With permission, in your training centre or on-site, locate a thermostatic
mixing valve. Locate any relevant maintenance documentation (often this
information can be downloaded from manufacturers’ websites) and safely
decommission the valve ready for routine maintenance.
Follow the maintenance instructions to adequately clean the filters,
check for operation and adjust to a suitable temperature. Ensure that the
supervising person checks your work before leaving in operation.

433

9781510416482.indb 433 29/03/19 9:02 PM