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QUESTION 12
The following six items relate to a mains pressure valve vented electric hot water system.
Explain the purpose of each item and how it functions.
(a) Pressure limiting or pressure reducing valve.
Purpose:
How it functions:
(2 marks)
(b) Filter.
Purpose:
How it functions:
(2 marks)
(c) Thermostat.
Purpose:
How it functions:
(2 marks)
(d) Energy cut out device.
Purpose:
How it functions:
(2 marks)
(e) Cold water expansion valve.
Purpose:
How it functions:
(2 marks)
(f) Temperature and pressure relief valve.
Purpose:
How it functions:
(2 marks)
Total 12 marks