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NATE Air Conditioning Troubleshooting

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What component is most often the cause of a start capacitor failure...
The sensing bulb at a lower temperature than the valve body
Condenser fans operating during a low ambient condition and a low suction pressure
A start relay
An uninsulated TXV sensing bulb

2. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90
110-120
A bad thermostat
A low refrigerant charge
A sensing bulb improperly connected to the suction line

3. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
An increase in low-side pressure
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
The sight glass is full of liquid+the sight glass is full of gas
Lack of airflow

4. The best description of a relay would be...
Contains a solenoid coil and one or more sets of contacts
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
110-120
High suction pressure and low superheat

5. What are two problems that can cause an air conditioning system to have an excessively high superheat...
The sight glass is full of liquid+the sight glass is full of gas
An uninsulated suction line and a restricted metering device
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
An open internal overload protector

6. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
The external equalizer could be plugged
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
A sensing bulb improperly connected to the suction line
Bad compressor valve

7. What is the common cause of a compressor burnout...
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
Rise more than normal
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Both technicians are incorrect

8. Which of the following problems can cause a decrease in a system's pressures and possible icing of the evaporator coil...
Low superheat
50-65
20 to 30
A missing air filter+improper rotation of the indoor blower+blower too small

9. What are the symptoms of a TXV air conditioning system if it has lost its charge...
The superheat will increase and the low-side pressure will decrease
Technician B
Short cycling and insufficient dehumidification
Both technicians are correct

10. What are the operating pressures of an oil pressure safety switch...
The oil pump pressure and the crankcase pressure
Low discharge pressure - high suction pressure - and low amp draw
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system

11. A restricted air filter in an air conditioning system can be identified by...
Low superheat
A restricted metering device
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Flooding the condenser - cycling condenser fans - and dampering condenser air

12. What are three methods for controlling a system's high-side pressure during low ambient conditions...
A vacuum test+oil traces around fittings+soap bubble solution
The sight glass is full of liquid+the sight glass is full of gas
Flooding the condenser - cycling condenser fans - and dampering condenser air
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

13. A customer calls and says that her air conditioning system is not cooling properly. Upon arrival - a technician notices that the suction line and compressor have frost buildup. Technician A says that the problem is probably a low charge. Technician B
Dirty condenser - bent condenser fins - and air recirculating over the condenser
A bad thermostat
Technician B
An increase in suction pressure and an increase in discharge pressure

14. Which of the following can cause excessive subcooling...
Short cycling and insufficient dehumidification
50-65
An overcharged system
Contains a solenoid coil and one or more sets of contacts

15. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
50-65
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Current in the compressor circuit
50-65

16. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
Short cycling and insufficient dehumidification
An increase in suction pressure and an increase in discharge pressure
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Lack of airflow

17. A customer calls with an insufficient cooling complaint. Upon arrival to the service call it is found that the system is using are-22 with the high-side pressure at 290 psig and the low-side pressure at 85 psig. The ambient temperature is 85
Technician A
Technician B
Low discharge pressure - high suction pressure - and low amp draw
Whenever necessary

18. Which of the following is a common cause of an excessively low superheat on a TXV system...
A sensing bulb improperly connected to the suction line
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
3 psig
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

19. A customer calls to complain that his central air conditioning system is not cooling properly. The technician arrives on the job. He or she notices that the indoor blower has adequate airflow and the outdoor condenser fan is operating - but the compr
An open internal overload protector
The internal overload is opened
Both technicians are correct
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

20. What are the symptoms of a TXV air conditioning system if it has lost its charge...
Low voltage and a faulty start relay
Technician B
A start capacitor and a solid-state relay
The superheat will increase and the low-side pressure will decrease

21. Which of the following could be the cause for a system's discharge and suction pressure being low...
The sensing bulb at a lower temperature than the valve body
An undercharge and low ambient conditions
110-120
A restricted metering device

22. What are the symptoms of an air conditioning system that has a low charge...
A blown fuse
Dirty condenser - bent condenser fins - and air recirculating over the condenser
The low-side pressure will decrease and the evaporator coil will be partially frosted
Short cycling and insufficient dehumidification

23. If 24 volts are present to the contactor coil on an air conditioning system and the condenser fan or compressor is inoperative - which of the following could be at fault...
Whenever necessary
An undercharged system+insufficient airflow over the evaporator coil
Low superheat
A blown fuse

24. A customer calls to complain that his central air conditioning system is not cooling properly. The technician arrives on the job. He or she notices that the indoor blower has adequate airflow and the outdoor condenser fan is operating - but the compr
An open internal overload protector
An increase in low-side pressure
An overcharged system
Technician B

25. What are three methods for controlling a system's high-side pressure during low ambient conditions...
Both technicians are incorrect
A blown fuse
Flooding the condenser - cycling condenser fans - and dampering condenser air
Low superheat

26. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...
A restricted metering device
110-120
Low discharge pressure - high suction pressure - and low amp draw
Dirty condenser - bent condenser fins - and air recirculating over the condenser

27. Why is it unsafe to operate an air conditioning system with a low charge...
Technician B
An increase in suction pressure and an increase in discharge pressure
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
The system has been overcharged+The system has air trapped in the condenser

28. After a compressor motor has been severely burnt - What accessory must be added as an aid to rid the air conditioning system of acid...
Short cycling and insufficient dehumidification
('Y' and 'C') and ('G' and 'C')
An acid-core suction line drier
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

29. When testing an indoor blower control circuit and the cooling circuit on a fan center - what terminals should read 24 volts if the air conditioning system is in operation...

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30. What are two common symptoms of a rooftop air conditioning system that operates with a reverse-acting high-pressure control stuck in the closed position...
Technician B
Whenever necessary
Condenser fans operating during a low ambient condition and a low suction pressure
An acid-core suction line drier

31. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...
It would cause the low-side pressure to decrease
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Technician B
Lack of airflow

32. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
High superheat and low discharge pressure
High suction pressure and low superheat
An undercharge and low ambient conditions
The superheat will increase and the low-side pressure will decrease

33. A customer calls with an insufficient cooling complaint on a 90
An overcharged system
Technician B
Lack of airflow
An uninsulated TXV sensing bulb

34. Which of the following will cause excessive discharge pressures on an air conditioning system...
An undercharged system+insufficient airflow over the evaporator coil
Low discharge pressure - high suction pressure - and low amp draw
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

35. A customer calls and complains that her high-efficiency air conditioning system is operating - but is not cooling properly. Further investigation shows that the system is using a TXV type of metering device. A subcooling check shows that the system a
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Both technicians are incorrect
Technician B
The external equalizer could be plugged

36. Why is it unsafe to operate an air conditioning system with a low charge...
A sensing bulb improperly connected to the suction line
An open internal overload protector
An overcharged system
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

37. What are two problems that can cause an air conditioning system to have an excessively high superheat...
Technician A
An uninsulated suction line and a restricted metering device
The low-side pressure will decrease and the evaporator coil will be partially frosted
Whenever necessary

38. Which of the following will cause excessive discharge pressures on an air conditioning system...
An uninsulated TXV sensing bulb
An undercharge and low ambient conditions
Technician A is correct
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

39. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.
The discharge pressure increases and the amperage increases
Technician B
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
The oil pump pressure and the crankcase pressure

40. The temperature range of the suction line from an air conditioning system should be...
Lack of airflow
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Bad compressor valve
50-65

41. The technician observes that the compressor is not operating. The compressor windings read 5 ohms start to run - run to common is opened - and start to common is opened. The technician concludes that...
An increase in low-side pressure
A start relay
An increase in suction pressure and an increase in discharge pressure
The internal overload is opened

42. A system that is operating with a clear sight glass shows...
'G' to 'C'
The sight glass is full of liquid+the sight glass is full of gas
High suction pressure and low superheat
3 psig

43. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
The superheat increases and the subcooling decreases
An increase of air leakage from ductwork
A low refrigerant charge
The external equalizer could be plugged

44. Which of the following can cause low superheat in a TXV system...
'G' to 'C'
An undercharge and low ambient conditions
An uninsulated TXV sensing bulb
A dirty condenser - recirculation of condenser air - and a defective condenser fan

45. When testing an indoor blower control circuit and the cooling circuit on a fan center - what terminals should read 24 volts if the air conditioning system is in operation...

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46. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
Rise more than normal
Condenser fans operating during a low ambient condition and a low suction pressure
20 to 30
Low superheat

47. Which of the following can cause excessive subcooling...
Low superheat
3 psig
The superheat will increase and the low-side pressure will decrease
An overcharged system

48. A commercial customer calls on a 90
The system has been overcharged+The system has air trapped in the condenser
Lack of airflow
An open internal overload protector
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor

49. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
Whenever necessary
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
It keeps a constant superheat in the evaporator
An overcharged system

50. Technician A says ' When charging a system using the superheat method - adding refrigerant to the system will increase the superheat.' Technician B says 'When charging a system using the superheat method - adding refrigerant will decrease the superhe
A bad thermostat
'G' to 'C'
Technician B
The oil pump pressure and the crankcase pressure

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NATE Air Conditioning Troubleshooting

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