Plumbing Inspection Section#2 Water Heaters Quiz#3

You should have finished Study Session 2 before starting this study session. This study session deals with gas burners and venting systems.

The estimated completion time is one to one and a half hours.

Objectives
At the end of this study session, you should be able to:

• List eight problems commonly found with gas burners.
• List eleven problems commonly found with venting systems for gas burners.

• Question 1

  Needs Grading

  	Briefly describe how you would check for spillage at the draft hood when testing the water heater.
  	Selected Answer: Make sure that exhaust products are not spilling out of the draft hood for more than a minute or so on initial start up. Once the unit has been running for about two minutes, air flow should be into, not out of, the draft hood.  Correct Answer:   Once the water heater has been running for 2 minutes, place your hand at the draft hood opening. Spillage is wet heat that passes across your hand. Response Feedback: [None Given]

• Question 2

  Needs Grading

  	Describe a B Vent type vent connector.
  	Selected Answer: B vent is a double-wall vent. It has air space between walls, a 1 inch clearance if all that is required Correct Answer:   B Vent are double-wall vents with an space between the walls. Response Feedback: [None Given]

• Question 3

  Needs Grading

  	List five common gas venting system problems.
  	Selected Answer: 1. Rust 2. Poor slope 3. Poor support 4. Poor connections 5. Spillage at the draft hood 6. Vent connector too small or too big for water heater 7. Vent connector too long Correct Answer: 1. Rust 2. Poor slope 3.Vent connector too long 4. Poor support 5. Poor connections 6. Inadequate clearance from combustibles 7. Vent connector too big or small 8. Improper material 9. Poor manifolding 10. Vent connector extends too far into chimney 11. Spillage at the draft hood Response Feedback: [None Given]

• Question 4

  Needs Grading

  	List five problems found with gas burners.
  	Selected Answer: 1. Inoperative 2. Scorching 3. Poor flame color pattern 4. Rust 5. Dirt or soot 6. Gas odor or leak Correct Answer:   1. Inoperative 2. Scorching 3. Poor flame color pattern 4. Rust 5. Dirt or soot 6. Gas odor or leak Response Feedback: [None Given]

• Question 5

  Needs Grading

  	List three causes of poor combustion.
  	Selected Answer: 1. The room the water heater is in can't provide adequate combustion and dilution air 2. The house is too tight 3. There are too many appliances that consumes combustion and dilution air Correct Answer: 1. Burners that are dirty, damaged or rusted 2. A poor fuel/air mixture 3. An inappropriate firing rate 4. An improper draft condition in the venting system Response Feedback: [None Given]

• Question 6

  Needs Grading

  	List three reasons for the problem of flame roll out or flashback.
  	Selected Answer: 1. Overfiring of the burner 2. Lack of combustion air supply 3. A chimney obstruction or downdraft 4. Underfiring of the burner Correct Answer:   1. Over firing of the burner 2. Lack of combustion air supply 3. A chimney obstruction or down draft 4. Underfiring of the burner Response Feedback: [None Given]

• Question 7

  Needs Grading

  	List three things that indicate poor flame colour or pattern.
  	Selected Answer: 1. A burner that is dirty, damaged or rusted 2. A poor fuel or air mixture 3. An inappropriate firing rate 4. Improper draft condition in the venting system (chimney) Correct Answer:   1. Yellow flame 2. Flame is lifting off the burner 3. Flame is not vertical 4. Flame is lazy or floating 5. Flame wanders around burner Response Feedback: [None Given]

• Question 8

  Needs Grading

  	Rusting above the flame roll out shield cover plate is a common sign of:
  	Selected Answer: Spillage Correct Answer:   Flame roll out or flashback Response Feedback: [None Given]

• Question 9

  Needs Grading

  	What are the two functions of the draft hood?
  	Selected Answer: 1. Add air to maintain chimney draft 2. Deflect downdrafts Correct Answer: 1. Draft hoods control the draft from the burner to maintain a constant (not excessive) airflow through the burner. 2. Draft hoods deflect down drafts coming down the chimney. Response Feedback: [None Given]

• Question 10

  Needs Grading

  	What is the implication of poor slope?
  	Selected Answer: Exhaust spillage into the house Correct Answer:   Exhaust spillage into the house. Response Feedback: [None Given]

• Question 11

  Needs Grading

  	What is the maximum horizontal length of vent connectors for gas appliances? (rough rule of thumb)
  	Selected Answer: 5 feet. 1 1/2 foot maximum horizontal run for every one inch of vent connector diameter Correct Answer:   Use 1.5 foot maximum horizontal run for every 1 inch of vent connector diameter. Response Feedback: [None Given]

• Question 12

  Needs Grading

  	What is the most common and serious implication of vent connector problems?
  	Selected Answer: Condensation or spillage of combustion products Correct Answer:   Exhaust products entering the house. Response Feedback: [None Given]

• Question 13

  Needs Grading

  	What is the proper slope for a vent connector?
  	Selected Answer: minimum 1/4 inch per foot Correct Answer:   The vent connector should upward going from the water heater at a minimum of 1/4 inch per foot. Response Feedback: [None Given]

• Question 14

  0 out of 0 points

  	How many screws should you find at connections in the vent connector?
  	Selected Answer:   3 screws Answers: 2 screws   3 screws 4 screws 5 screws no screws, this is a slip fitting Response Feedback: Good work

• Question 15

  0 out of 0 points

  	Is it possible to manifold a vent from a natural draft gas burner and an induced draft burner?
  	Selected Answer:   Yes Answers:   Yes No Response Feedback: Good work

• Question 16

  0 out of 0 points

  	Rust caused by condensation in a gas fired appliance vent system is usually found:
  	Selected Answer:   on the lower part of the vent connector Answers: on the upper part of the vent connector   on the lower part of the vent connector around the entire circumference of the vent connector at the thimble where the vent connector joins the chimney on the outside of the water heater cabinet Response Feedback: Good work

• Question 17

  0 out of 0 points

  	A 40,000 BTU per hour input water heater should connect to a chimney flue shared by a 100,000 BTU per hour furnace above (after) the furnace vent connector.
  	Selected Answer:  False Answers:  True False Response Feedback: That's not correct

• Question 18

  0 out of 0 points

  	B Vent type vent connectors require a 1 inch combustible clearance.
  	Selected Answer:  True Answers:  True False Response Feedback: Good work

• Question 19

  0 out of 0 points

  	Gas water heater vent connectors which are single wall require a 9 inch combustible clearance.
  	Selected Answer:  False Answers: True  False Response Feedback: Good work

• Question 20

  0 out of 0 points

  	Steel is an acceptable vent connector material but aluminum is not.
  	Selected Answer:  False Answers: True  False Response Feedback: Good work

• Question 21

  0 out of 0 points

  	The manifolding in the previous question should be as close as possible to the appliances.
  	Selected Answer:  False Answers: True  False Response Feedback: Good work