Plumbers NZ is New Zealand's largest online plumbing, gas and drainage resource. Plumbing exam help, plumbing news, directory and free quotes.
-
QUESTION 2
(a) Name and describe TWO tests used to determine how well a natural draught flue
is working.
Name
Description
Name
Description
(4 marks)
(b) State FOUR factors to be considered in selecting the position for an open flue terminal.
1
2
3
4
(2 marks)
(c) State TWO possible dangers if the heat exchanger of a domestic warm air heating unit has
a hole in it.
1
2
(2 marks)
Total 8 marks
-
Question 2
(a)
(have also added procedure of testing)
Smoke Test
-Close all doors and windows in the room containing the flue.
-Introduce some heat into the flue (blow torch)
-Check that the flue is pulling, using a smoke match. If it is, proceed with a smoke pellet. (If it was not pulling and you used a smoke pellet the room would now be full of smoke.)
-Walk the route of the flue, checking for any signs of leakage (don't forget the roof space)
Spillage test
-Light the appliance, set to high and allow it to heat up
-Close all doors and windows in the room
-Apply the spillage test in accordance with the appliance manufacturers instructions
-If there is an y spillage, leave the appliance running for a further 10 minutes and repeat the test.
-If, after a further test, there are still doubts about the appliances ability to clear the combustion products, disconnect the appliance and seek further advice.
Generally a mirror can be used to find spillage around a flue, showing condensation. This can also be seen on windows or even doors.
(b)