Deck 9: Gas Piping, Venting, and Appliance Efficiency

Question 1

If there is too much primary air, the gas flame can ____.

A) get blown out
B) "lift" off the burner rack
C) make noise
D) both b and c

Answer 1

D

Question 2

What is the difference between a yellow gas flame and an orange gas flame?

Answer 2

A yellow flame represents an air-starved flame-carbon monoxide is being produced! An orange flame represents the burning of dust-not dangerous.

Question 3

When a gas furnace ignites and is under "full-fire," why does the fan not come on immediately?

Answer 3

The chamber must warm up first or the blower will circulate cold air.

Question 4

In a conventional gas furnace, the hot flue gases are ____.

A) forced out a PVC vent with a blower
B) recycled through a secondary heat exchanger and then vented through a draft diverter
C) forced through a type B vent by a blower
D) vented by natural convection

Question 5

Why do propane and butane gas furnaces require 100% shut off in the event of pilot outage?

Question 6

The flame in a gas fired furnace is burning with heavy yellow tips. What is the problem?