Air Conditioning and Heat Pumps Inspection Section#1 Air Conditioning Quiz#3

• Question 1

  Needs Grading

  	Do condensate drain lines ever have a trap? If so, what is its purpose?
  	Selected Answer: If the condensate drain line is under negative pressure (upstream of blower), a trap is required. If the line is negative pressure, air may be sucked up the drain and the water may not be able to flow down the drain line. In some cases, the drain pan may fill up and overflow.  Correct Answer: 1. The trap may be required if the condensate pan is upstream of the house air fan, because the water is under negative pressure. 2. If the condensate is allowed directly into waste plumbing, a trap is required. Response Feedback: [None Given]

• Question 2

  Needs Grading

  	Explain in two sentences the differences between a conventional air-to-air condenser and a water-cooled condenser coil.
  	Selected Answer: In water-cooled air conditioner, the heat in the refrigerant is discharged into water. In air-to-air conditioner, the heat in the refrigerant is discharged into air. Water-cooled condenser coils don't employ fins. It is typically a jacketed system with the refrigerant lines inside the water tubing.  Correct Answer:   An air-to-air condenser transfers its heat to the outside air with the help of a fan. A water-cooled condenser transfers the heat to water. Response Feedback: [None Given]

• Question 3

  Needs Grading

  	How would you normally identify a leak in a refrigerant line visually?
  	Selected Answer: Watch for oil stains on and below coils or pipes. This oil is carried with refrigerant and it indicates refrigerant leakage Correct Answer:   This may be identified by an oil residue below the line set, typically at valves or coil connections. Response Feedback: [None Given]

• Question 4

  Needs Grading

  	In one sentence describe the function of a capillary tube.
  	Selected Answer: Capillary tube is one type of expansion device. It is old type. It located just upstream of the evaporator coil that changes the refrigerant from a high pressure, high temperature liquid to a low pressure, low temperature liquid. It simply created a bottleneck in the liquid line.  Correct Answer:   The capillary tube acts as an obstruction in the line, reducing the pressure and temperature of the liquid Freon. Response Feedback: [None Given]

• Question 5

  Needs Grading

  	In one sentence describe the function of a thermostatic valve.
  	Selected Answer: The TXV controls the refrigerant flow into the evaporator coil by sensing the heat from the refrigerant flowing out of the coil.  Correct Answer:   A TXV, or TEV acts as a more precise expansion device on larger air conditioners, or heat pumps. Response Feedback: [None Given]

• Question 6

  Needs Grading

  	List five common refrigerant line problems.
  	Selected Answer: 1. Leaking 2. Damage 3. Missing insulation 4. Lines too warm or cold 5. Lines touching each other Correct Answer:   1. Leaking 2. Damage 3. Missing insulation 4. Lines too warm or cold 5. Lines touching each other Response Feedback: [None Given]

• Question 7

  Needs Grading

  	List five possible causes of leaking condensate drain pipes.
  	Selected Answer: 1. Disconnected from the condensate tray 2. Split 3. Disconnected at the trap 4. Crimped, clogged 5. Mechanically damaged anywhere along its length Correct Answer: 1. The pan may be cracked, or have an open seam in it. 2. The opening to the drain line may be obstructed. 3. The drain line may be missing or disconnected. 4. The pan may not be sloped properly, allowing water to overflow rather than run to the drain. 5. The pan may be rusted through. 6. The pan may not be properly located below the coil. 7. The pan may be filled with debris, restricting the amount of water it can hold. Response Feedback: [None Given]

• Question 8

  Needs Grading

  	List four common expansion device problems.
  	Selected Answer: 1. Capillary tube defects 2. Thermostatic expansion valve connections loose 3. Clogged orifice 4. Expansion valve sticking Correct Answer:   1. Capillary tube defects 2. Thermostatic expansion valve connections loose 3. Clogged orifice 4. Expansion valve sticking Response Feedback: [None Given]

• Question 9

  Needs Grading

  	List four condenser problems.
  	Selected Answer: 1. Dirty 2. Damaged or leaking 3. Corrosion 4. Clothes dryer or water heater exhaust too close to condenser Correct Answer:   1. Dirty 2. Damaged or Leaking 3. Corrosion 4. Dryer or water heater exhaust too close Response Feedback: [None Given]

• Question 10

  Needs Grading

  	List six common evaporator problems.
  	Selected Answer: 1. No access to coil 2. Dirty 3. Frost 4. Top of evaporator dry 5. Corrosion 6. Damage Correct Answer:   1. No access to coil 2. Dirty 3. Frost 4. Top of evaporator dry 5. Corrosion 6. Damage Response Feedback: [None Given]

• Question 11

  Needs Grading

  	List three common condensate pump problems.
  	Selected Answer: 1. Inoperative 2. Leaking 3. Poor wiring Correct Answer:   1. Inoperative 2. Leaking 3. Poor wiring Response Feedback: [None Given]

• Question 12

  Needs Grading

  	List three common configurations of evaporator coils.
  	Selected Answer: 1. A-coil 2. N-coil 3. Slab coil Correct Answer:   A-coil, slab coil, vertical coil Response Feedback: [None Given]

• Question 13

  Needs Grading

  	List three common water-cooled coil problems.
  	Selected Answer: 1. Coil cooled by pool water 2. No backflow preventer 3. Low plumbing water pressure Correct Answer:   1. Leakage 2. Coil cooled by pool water 3. No backflow preventer 4. Low plumbing water pressure Response Feedback: [None Given]

• Question 14

  Needs Grading

  	List two acceptable discharge points for condensate drain lines and one generally unacceptable discharge point.
  	Selected Answer: 1. Laundry tub 2. Bathtub 3. Basin 4. Washer standpipe 1. Granular materials below slab 2. Plumbing stack 3. Outside wall Correct Answer: Acceptable: 1. Outside the building directly into the ground 2. Near the basement floor drain (must be an air gap) Unacceptable: 1. Into the granular fill beneath the basement floor slab 2. Into the waste plumbing stack Response Feedback: [None Given]

• Question 15

  Needs Grading

  	What are condensate drain lines usually made of?
  	Selected Answer: plastic or copper of 3/4 inch diameter Correct Answer:   Plastic or copper Response Feedback: [None Given]

• Question 16

  Needs Grading

  	What is the function of a receiver in a condenser?
  	Selected Answer: Collect condensed refrigerant Correct Answer:   Receivers collect condensed refrigerant from the condenser coil. Response Feedback: [None Given]

• Question 17

  Needs Grading

  	When is an auxiliary condensate drain pan needed?
  	Selected Answer: Auxiliary condensate drain pans are typically provided where an evaporator coil is located in an attic or anywhere above finished living space.  Correct Answer:   An auxiliary pan is needed when the evaporator coil is located in an attic, or anywhere over a finished living space. Response Feedback: [None Given]

• Question 18

  Needs Grading

  	Which line should be cold when the system is operating?
  	Selected Answer: suction line Correct Answer:   Suction line (large insulated one) Response Feedback: [None Given]

• Question 19

  Needs Grading

  	Which line should be insulated?
  	Selected Answer: suction line Correct Answer:   Suction line Response Feedback: [None Given]

• Question 20

  Needs Grading

  	Which line should be warm when the system is operating?
  	Selected Answer: liquid line Correct Answer:   Liquid line (small uninsulated one) Response Feedback: [None Given]

• Question 21

  0 out of 0 points

  	Refrigerant lines are usually made of?
  	Selected Answer:   Copper Answers: Lead Zinc   Copper Response Feedback: Well done!!

• Question 22

  0 out of 0 points

  	The condenser coil in a split system is typically located...
  	Selected Answer:   Outdoors Answers:   Outdoors Indoors Both outdoors and indoors Response Feedback: Well done!!

• Question 23

  0 out of 0 points

  	The condenser fan in a split system is located...
  	Selected Answer:   Outdoors Answers:   Outdoors Indoors Both outdoors and indoors Response Feedback: Well done!!

• Question 24

  0 out of 0 points

  	The evaporator coil in a split system is typically located...
  	Selected Answer:   Indoors (above the furnace) Answers:   Indoors (above the furnace) Indoors (below the furnace) Outdoors Response Feedback: Well done!!

• Question 25

  0 out of 0 points

  	Evaporator coils should be upstream of furnace heat exchangers.
  	Selected Answer:  False Answers: True  False Response Feedback: Well done!!

• Question 26

  0 out of 0 points

  	The larger line contains a liquid.
  	Selected Answer:  False Answers: True  False Response Feedback: Well done!!

• Question 27

  0 out of 0 points

  	The larger line is called the return line.
  	Selected Answer:  True Answers:  True False Response Feedback: Well done!!

• Question 28

  0 out of 0 points

  	The smaller line is called the suction line.
  	Selected Answer:  False Answers: True  False Response Feedback: Well done!