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Author Question: Explain why furnace efficiencies jump from 80 to 90 What will be an ideal ... (Read 22 times)

lbcchick

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on: Jul 26, 2018
Explain why furnace efficiencies jump from 80 to 90
 
  What will be an ideal response?

Question 2

Why are tubing brushes used?
 
  What will be an ideal response?


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carlsona147

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Reply #1 on: Jul 26, 2018
Answer to Question 1

Efficiencies above 80 cause condensation either in the furnace or in the vent. The flue gas for efficiencies below 90 is too hot for PVC vent. So the vent on a furnace between 80 and 90 must withstand high temperature and water, making it impractical.

Answer to Question 2

To clean oxides, oil, or dirt off of copper tubing so it can be soldered or brazed.


lbcchick

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Reply 2 on: Jul 26, 2018
Gracias!

diana chang

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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