other Flashcards

1
Q

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.

A
  • Behind the appliance
  • Vented to outside
  • One above the absorption fins
  • One at low level
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

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.

A

Orifice

To allow a greater flow

Spring

To provide greater resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

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

A
  • 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.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

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.

A

A hole or crack in the heat exchanger.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Give TWO probable situations which would allow this fault to occur

A
  • Burners were incorrectly located heat exchanger was over heated.
  • Movement/expansion stresses.
  • Corrosion of the heat exchanger.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly