other

Question 1

AS/NZS 5601 Part 2 gives ventilation requirements that are specific to a 90 litre gas
refrigerator installed in a caravan.
(i) Give TWO conditions regarding the ventilation that must be met.

Answer 1

• Behind the appliance
• Vented to outside
• One above the absorption fins
• One at low level

Question 2

Identify the TWO components of the regulator that may need to be changed and give a reason for each. Assume all other equipment is suitable for the increased throughput.

Answer 2

Orifice

To allow a greater flow

Spring

To provide greater resistance

Question 3

Give THREE reasons why an appliance would require combustion air to be ducted from outside.

Answer 3

• Flammable vapours present.
• Appliance is installed in a confined space where alternative ventilation is not possible.
• Ventilation or fans interfering with the combustion air.
• Manufacturer’s requirement.

Question 4

A gas-fired ducted central heating furnace has developed a fault. The customer is complaining of headaches and a strange smell when the furnace is operating.
(i) Give the most likely explanation for the fault.

Answer 4

A hole or crack in the heat exchanger.

Question 5

Give TWO probable situations which would allow this fault to occur

Answer 5

• Burners were incorrectly located heat exchanger was over heated.
• Movement/expansion stresses.
• Corrosion of the heat exchanger.