QUESTION 6
(a) State the function of each of the following systems fitted to a package burner:
1 Gas control system
2 Air control system
3 Ignition control system
4 Flame control system
(4 marks)

(b)  State the THREE steps in the operating sequence of a two-stage automatic safety shut off valve
fitted to an industrial furnace.
1
2
3
(3 marks)

(c) Some appliances contain an overheat switch and a thermostat.  Explain their relationship.
(1 mark)
Total 8 marks

Linkback: https://forum.plumbers.nz/gas-exam-2006/20/question-6/148/