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QUESTION 9
(a) State THREE reasons for providing ventilation for a gas fired water heater installed in a cupboard.
1
2
3
(3 marks)
(b) List, in the correct order, SEVEN steps that are required to safely purge air from a new domestic
gas installation with an open burner.
1
2
3
4
5
6
7
(7 marks)
(c) Sketch, label and describe the appearance of a correctly adjusted pre-aerated natural gas flame.
(4 marks)
(d) State TWO characteristics of a pre-aerated gas burner flame if the primary air inlet becomes
blocked.
1
2
(2 marks)
(e) Define what is meant by 'LOCK-UP' pressure in relation to a gas installation.
(1 mark)
Total 17 marks