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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. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...
An overcharged system
Flooding the condenser - cycling condenser fans - and dampering condenser air
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Run with high head and high suction pressure

2. What component is most often the cause of a start capacitor failure...
A start relay
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
The sensing bulb at a lower temperature than the valve body
50-65

3. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
3 psig
The sensing bulb at a lower temperature than the valve body
Technician A is correct

4. A restricted air filter in an air conditioning system can be identified by...
Always have some liquid present in the bulb and diaphragm
An increase in low-side pressure
Low superheat
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

5. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
3 psig
Short cycling and insufficient dehumidification
The external equalizer could be plugged
An increase in suction pressure and an increase in discharge pressure

6. Which of the following can cause excessive subcooling...
An overcharged system
It is used to control refrigerant pressure in the compressor crankcase
The superheat will increase and the low-side pressure will decrease
Short cycling and insufficient dehumidification

7. A system that is operating with a clear sight glass shows...
The sight glass is full of liquid+the sight glass is full of gas
A blown fuse
A low refrigerant charge
An uninsulated suction line and a restricted metering device

8. A split-system air conditioner that uses a piston-type metering device is to be charged with are-22. Technician A says that the outdoor dry-bulb temperature is needed to determine the proper superheat. Technician B says that the indoor wet-bulb tempe
The discharge pressure increases and the amperage increases
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
The discharge pressure increases and the amperage increases
Both technicians are correct

9. Superheat is found in an air conditioning system in the...
Evaporator and compressor
Flooding the condenser - cycling condenser fans - and dampering condenser air
A sensing bulb improperly connected to the suction line
A restricted metering device

10. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
3 psig
The superheat increases and the subcooling decreases
Increases starting torque

11. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90
Contains a solenoid coil and one or more sets of contacts
110-120
'G' to 'C'
The superheat increases and the subcooling decreases

12. What are two problems that can cause an air conditioning system to have an excessively high superheat...
An uninsulated suction line and a restricted metering device
A start capacitor and a solid-state relay
Increases starting torque
A bad thermostat

13. What are common methods that are used for leak-testing a system...
Whenever necessary
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
A vacuum test+oil traces around fittings+soap bubble solution
The superheat increases and the subcooling decreases

14. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
110-120
A dirty condenser - recirculation of condenser air - and a defective condenser fan
An open internal overload protector
Bad compressor valve

15. Air filters should be replaced...
The internal overload is opened
Whenever necessary
Always have some liquid present in the bulb and diaphragm
It would cause the low-side pressure to decrease

16. What are the symptoms of an air conditioning system that has a low charge...
Technician A is correct
The superheat will increase and the low-side pressure will decrease
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
The low-side pressure will decrease and the evaporator coil will be partially frosted

17. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...
A start relay
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Technician B
Condenser fans operating during a low ambient condition and a low suction pressure

18. When using a vapor-charged TXV bulb - it is necessary to have...
Short cycling and insufficient dehumidification
The sensing bulb at a lower temperature than the valve body
Technician B
An undercharge and low ambient conditions

19. Which of the following is a common cause of an excessively low superheat on a TXV system...
An increase in low-side pressure
A sensing bulb improperly connected to the suction line
Technician B
Run with high head and high suction pressure

20. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
Technician B
Increases starting torque
3 psig
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

21. Which of the following can cause excessive subcooling...
The sight glass is full of liquid+the sight glass is full of gas
An overcharged system
A sensing bulb improperly connected to the suction line
'G' to 'C'

22. What are the operating pressures of an oil pressure safety switch...
The oil pump pressure and the crankcase pressure
An uninsulated TXV sensing bulb
Short cycling and insufficient dehumidification
50-65

23. Insufficient airflow can be caused by...
The external equalizer could be plugged
An increase of air leakage from ductwork
Broken rings+broken valves+seized bearings
Low superheat

24. What is a possible cause of a sweat or frost pattern downstream from a sight glass and filter dryer...
('Y' and 'C') and ('G' and 'C')
Low voltage and a faulty start relay
The superheat increases and the subcooling decreases
A plugged filter drier

25. What component is most often the cause of a start capacitor failure...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
A start relay
The sight glass is full of liquid+the sight glass is full of gas

26. What is a possible cause of a sweat or frost pattern downstream from a sight glass and filter dryer...
A plugged filter drier
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Flooding the condenser - cycling condenser fans - and dampering condenser air
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser

27. What is the purpose of a CPR valve...
An undercharge and low ambient conditions
It is used to control refrigerant pressure in the compressor crankcase
It would cause the low-side pressure to decrease
Clean the condenser coil

28. Which of the following is a possible cause for a compressor to overheat...
The sight glass is full of liquid+the sight glass is full of gas
A low refrigerant charge
Evaporator and compressor
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser

29. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
The superheat increases and the subcooling decreases
A restricted metering device
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
It keeps a constant superheat in the evaporator

30. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
Broken rings+broken valves+seized bearings
A low refrigerant charge
The sight glass is full of liquid+the sight glass is full of gas
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

31. 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
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Broken rings+broken valves+seized bearings
The external equalizer could be plugged
The sight glass is full of liquid+the sight glass is full of gas

32. What three things can prevent an air conditioning system from releasing heat at the proper rate...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
'G' to 'C'
Bad compressor valve
Technician B

33. A hard-start kit consists of...
Both technicians are incorrect
A start capacitor and a solid-state relay
The low-side pressure will decrease and the evaporator coil will be partially frosted
('Y' and 'C') and ('G' and 'C')

34. What causes the automatic expansion valve to close...
The low-side pressure will decrease and the evaporator coil will be partially frosted
An increase in low-side pressure
('Y' and 'C') and ('G' and 'C')
20 to 30

35. The internal overload of an air conditioning compressor senses winding temperature and...
Whenever necessary
('Y' and 'C') and ('G' and 'C')
Current in the compressor circuit
An uninsulated suction line and a restricted metering device

36. 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
Rise more than normal
Technician B
The internal overload is opened

37. 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...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
A blown fuse
Bad compressor valve
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

38. A customer calls and complains that his air conditioning system is not operating properly. It is noticed that the compressor is not operating. A check on the run capacitor shows that there is 33 uf and the rating on the capacitor is 40 uf. Technician
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Technician B
A defective circuit breaker
A vacuum test+oil traces around fittings+soap bubble solution

39. 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...
50-65
Condenser fans operating during a low ambient condition and a low suction pressure
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

40. What causes the automatic expansion valve to close...
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
It is used to control refrigerant pressure in the compressor crankcase
An increase in low-side pressure
An increase in suction pressure and an increase in discharge pressure

41. What is the common cause of a compressor burnout...
Always have some liquid present in the bulb and diaphragm
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
An acid-core suction line drier
A defective circuit breaker

42. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
The external equalizer could be plugged
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Condenser fans operating during a low ambient condition and a low suction pressure
The low-side pressure will decrease and the evaporator coil will be partially frosted

43. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
Technician B
High suction pressure and low superheat
The superheat increases and the subcooling decreases
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

44. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
Whenever necessary
Technician B
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

45. Air filters should be replaced...
An open internal overload protector
Whenever necessary
Contains a solenoid coil and one or more sets of contacts
The discharge pressure increases and the amperage increases

46. 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
Current in the compressor circuit
An open internal overload protector
An increase in low-side pressure

47. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
Technician A is correct
An uninsulated TXV sensing bulb
Run with high head and high suction pressure
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device

48. A technician arrives on the job and the customer complains that there is no cooling on his rooftop unit. Troubleshooting the system - the technician finds that the compressor is faulty. He notices that there is another faulty compressor laying next t
Broken rings+broken valves+seized bearings
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Always have some liquid present in the bulb and diaphragm
Condenser fans operating during a low ambient condition and a low suction pressure

49. A technician arrives on the job and the customer complains that there is no cooling on his rooftop unit. Troubleshooting the system - the technician finds that the compressor is faulty. He notices that there is another faulty compressor laying next t
A restricted metering device
110-120
Broken rings+broken valves+seized bearings
Always have some liquid present in the bulb and diaphragm

50. A system that uses a thermal electric expansion valve...
The external equalizer could be plugged
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Low voltage and a faulty start relay
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system

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NATE Air Conditioning Troubleshooting

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