Air Conditioning and Heat Pumps Inspection Section#2 Heat Pumps Quiz#2

• Question 1

  Needs Grading

  	What are the typical cooling loads in square feet cooled per ton (in your area)?
  	Selected Answer: 1000sqft Correct Answer:   1) 450 to 700 square feet - southern U.S.A. 2) 700 to 1000 square feet - moderate climates Response Feedback: [None Given]

• Question 2

  0 out of 0 points

  	You should not operate the heat pump in the heating mode when the outdoor temperature is above?
  	Selected Answer:  65F Correct Answer: Evaluation Method Correct Answer Case Sensitivity Exact Match 65°F Response Feedback: That's incorrect.

• Question 3

  Needs Grading

  	List seven common heat pump problems that are in addition to the air conditioning problems discussed earlier.
  	Selected Answer: 1. Over-sized for cooling and/or undersized for heating 2. Heat pump inoperative in heating or cooling mode  3. Poor outdoor coil location 4. Outdoor coil is iced up 5. Airflow problems  6. No back-up heat, or back-up heat does not work 7. Old  Correct Answer:     Response Feedback: [None Given]

• Question 4

  Needs Grading

  	List 12 components that are common to heat pumps and air conditioners.
  	Selected Answer: 1. Compressor  2. Indoor coil  3. Metering (expansion) device 4. Outdoor coil 5. Outdoor fan (condenser fan) 6. Condensate tray and condensate lines  7. Refrigerant lines  8. Indoor fan (evaporator fan) 9. Duct system 10. Duct insulation  11. Air filter  12. Thermostat  Correct Answer: 1. Compressor 2. Indoor coil 3. Expansion device 4. Outdoor coil 5. Outdoor fan 6. Condensate tray and lines 7. Refrigerant lines 8. Indoor fan 9. Duct system 10. Duct insulation 11. Air filter 12. Thermostat Response Feedback: [None Given]

• Question 5

  Needs Grading

  	An ideal heat pump arrangement typically moves more or less air across the heat transfer medium than a conventional gas furnace?
  	Selected Answer: yes Correct Answer:   More air is moved for a heat pump than a furnace. Response Feedback: [None Given]

• Question 6

  Needs Grading

  	List six components of heat pumps that are different than those that are found on central air conditioning systems.
  	Selected Answer: 1. Reversing valve 2. The indoor and outdoor coil reverse function summer and winter 3. Both of refrigerant lines may be insulated 4. outdoor air temperature sensor  5. emergency heat 6. two-stage thermostat 7. triple-split system Correct Answer: 1. Reversing valve 2. Both refrigerant lines may be insulated 3. May have an outdoor air temperature sensor 4. Emergency heat setting on the thermostat 5. Two-stage thermostat 6. Compressor may be indoors 7. The heat pump may be a triple split system Response Feedback: [None Given]

• Question 7

  Needs Grading

  	Explain in one sentence each, the two common ways of melting the frost.
  	Selected Answer: 1. electric heaters 2. reversal of a cycle Correct Answer: 1. Electric heaters can melt the ice. 2. The heat pump reverses, operating in cooling mode with the outdoor fan off. This heats the outdoor coil, melting the ice. Response Feedback: [None Given]

• Question 8

  Needs Grading

  	List eight clues that would suggest that you are looking at a heat pump rather than a central air conditioning system.
  	Selected Answer: 1. Look at date plate 2. If the thermostat has a emergency heat setting 3. two-stage thermostat 4. Both refrigerant line is insulated  5. reversing valve 6. two expansion device  7. compressor is indoor and air-to-air system 8. outdoor thermostat connected to control wiring  9. in winter and unit is operating  Correct Answer: 1. Data plate may say "HP" or "Heat Pump" 2. Thermostat has an emergency heat setting 3. Both Freon lines are insulated 4. Presence of a reversing valve 5. Compressor is indoors and it's an air-to-air system 6. Presence of an outdoor thermostat connected to control wiring 7. If it is winter and the unit is operating, it's a heat pump. 8. You find a two-stage thermostat. 9. You find two expansion devices. Response Feedback: [None Given]

• Question 9

  Needs Grading

  	Explain in one sentence each, the two common methods heat pumps use to detect frost on the heat pump.
  	Selected Answer: 1. Electric heaters 2. Activate the reversing valve to go into the cooling mode.  In either mode, when the system is in the defrost cycle, the outdoor fan shuts down.  Correct Answer: 1. Time and temperature defrost mode - the system checks the temperature near the outdoor coil every 30 to 90 minutes. If it is below 32°F, it goes into defrost. 2. Demand defrost - the system measures the air pressure drop across the coil, coil temperature, or Freon pressures every minute. Response Feedback: [None Given]

• Question 10

  Needs Grading

  	Is the discharge house air temperature from a heat pump higher or lower than from a gas furnace?
  	Selected Answer: higher Correct Answer:   Lower for a heat pump than a furnace. Response Feedback: [None Given]

• Question 11

  Needs Grading

  	Heat pumps are normally designed for the cooling load. What would allow an exception to this?
  	Selected Answer: Two-stage compressor  Correct Answer:   We could use a two-stage compressor, which could have a lower output in the summer than in the winter. Response Feedback: [None Given]

• Question 12

  0 out of 0 points

  	You should not operate the heat pump in the cooling mode when the outdoor temperature is below?
  	Selected Answer:  65F Correct Answer: Evaluation Method Correct Answer Case Sensitivity Exact Match 65°F Response Feedback: That's incorrect.

• Question 13

  Needs Grading

  	What are the typical heating loads in BTUs per square foot (given in general terms in the text)?
  	Selected Answer: 25 to 40 BTU per sqft Correct Answer:   1) 40 to 60 BTUs per square foot in older homes 2) 25 to 40 BTUs per square foot in newer homes Response Feedback: [None Given]

• Question 14

  Needs Grading

  	Explain in two sentences why defrosting is necessary.
  	Selected Answer: The frost would clog the airflow Correct Answer: When the heat pump is operating in cold weather, the temperature of the coil is cooler than the air around it. The air becomes saturated, and frost develops on the coils, reducing the efficiency of the unit. Response Feedback: [None Given]