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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. Which of the following can cause low superheat in a TXV system...
20 to 30
An uninsulated TXV sensing bulb
The discharge pressure increases and the amperage increases
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

2. Technician A says that to manually pump down an air conditioning system with a two-position service valve - the liquid line must be front-seated and the high- and low-side pressure will decrease to 0 psig when the pump-down is complete. Technician B
Technician B
Evaporator and compressor
Technician A
Technician A is correct

3. 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 vacuum test+oil traces around fittings+soap bubble solution
Bad compressor valve
The external equalizer could be plugged
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

4. A system that uses a thermal electric expansion valve...
Both technicians are correct
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
It keeps a constant superheat in the evaporator
50-65

5. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Condenser fans operating during a low ambient condition and a low suction pressure
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

6. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
It keeps a constant superheat in the evaporator
The superheat will increase and the low-side pressure will decrease
Bad compressor valve
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system

7. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
A vacuum test+oil traces around fittings+soap bubble solution
Technician B
3 psig
The superheat will increase and the low-side pressure will decrease

8. What are three methods for controlling a system's high-side pressure during low ambient conditions...
Flooding the condenser - cycling condenser fans - and dampering condenser air
The low-side pressure will decrease and the evaporator coil will be partially frosted
Current in the compressor circuit
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

9. 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 start relay
Technician B
The discharge pressure increases and the amperage increases
A vacuum test+oil traces around fittings+soap bubble solution

10. 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...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
The internal overload is opened
Evaporator and compressor
Rise more than normal

11. What is the common cause of a compressor burnout...
Technician A is correct
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
The external equalizer could be plugged
Broken rings+broken valves+seized bearings

12. Why is it unsafe to operate an air conditioning system with a low charge...
Whenever necessary
A restricted metering device
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

13. A restricted air filter in an air conditioning system can be identified by...
An uninsulated suction line and a restricted metering device
Low superheat
An undercharge and low ambient conditions
A plugged filter drier

14. Superheat is found in an air conditioning system in the...
Dirty condenser - bent condenser fins - and air recirculating over the condenser
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Evaporator and compressor
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system

15. The internal overload of an air conditioning compressor senses winding temperature and...
3 psig
Current in the compressor circuit
('Y' and 'C') and ('G' and 'C')
Technician B

16. Insufficient airflow can be caused by...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
An increase of air leakage from ductwork
Both technicians are correct
It keeps a constant superheat in the evaporator

17. What are the symptoms of an air conditioning system that has a bad compressor discharge valve...
Contains a solenoid coil and one or more sets of contacts
The system has been overcharged+The system has air trapped in the condenser
It keeps a constant superheat in the evaporator
Low discharge pressure - high suction pressure - and low amp draw

18. A hard-start kit for an air conditioning system...
Increases starting torque
Flooding the condenser - cycling condenser fans - and dampering condenser air
110-120
The discharge pressure increases and the amperage increases

19. 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
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
Broken rings+broken valves+seized bearings
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

20. 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
Flooding the condenser - cycling condenser fans - and dampering condenser air
Technician B
An open internal overload protector
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor

21. What problem can cause an increase of discharge pressure and an increase of suction pressure...
Condenser fans operating during a low ambient condition and a low suction pressure
An undercharged system+insufficient airflow over the evaporator coil
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
An overcharged system

22. A hard-start kit consists of...
An acid-core suction line drier
Evaporator and compressor
Whenever necessary
A start capacitor and a solid-state relay

23. What is the purpose of the TXV...
The oil pump pressure and the crankcase pressure
The superheat will increase and the low-side pressure will decrease
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
It keeps a constant superheat in the evaporator

24. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
A dirty condenser - recirculation of condenser air - and a defective condenser fan
The superheat increases and the subcooling decreases
Lack of airflow

25. Which of the following can cause excessive subcooling...
An overcharged system
Low discharge pressure - high suction pressure - and low amp draw
20 to 30
A plugged filter drier

26. Which of the following is a common cause of an excessively low superheat on a TXV system...
An increase in low-side pressure
('Y' and 'C') and ('G' and 'C')
An acid-core suction line drier
A sensing bulb improperly connected to the suction line

27. 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
Broken rings+broken valves+seized bearings
The superheat will increase and the low-side pressure will decrease
An uninsulated suction line and a restricted metering device

28. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90
An undercharge and low ambient conditions
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
110-120

29. 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
Technician B
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Both technicians are correct
A start capacitor and a solid-state relay

30. What is the purpose of an EPR valve...
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
Always have some liquid present in the bulb and diaphragm
An overcharged system
20 to 30

31. 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...
50-65
110-120
Whenever necessary
A blown fuse

32. What are three methods for controlling a system's high-side pressure during low ambient conditions...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
An overcharged system
('Y' and 'C') and ('G' and 'C')
Flooding the condenser - cycling condenser fans - and dampering condenser air

33. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...
Technician B
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Low discharge pressure - high suction pressure - and low amp draw
Bad compressor valve

34. What are two problems that can cause an air conditioning system to have an excessively high superheat...
An open internal overload protector
An uninsulated suction line and a restricted metering device
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

35. What are two problems that can cause an air conditioning system to have an excessively high superheat...
Always have some liquid present in the bulb and diaphragm
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
An uninsulated suction line and a restricted metering device
An open internal overload protector

36. What is the purpose of an EPR valve...
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Both technicians are correct
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

37. A 220-volt 30-amp motor circuit keeps tripping the breaker after the motor is started. The starting amperage is 60 amps. When measuring the amperage of the circuit - This is drawn for a brief moment. After startup - the amperage drops to 22 amps and
Both technicians are incorrect
A low refrigerant charge
A defective circuit breaker
Increases starting torque

38. The best description of a relay would be...
Contains a solenoid coil and one or more sets of contacts
The superheat will increase and the low-side pressure will decrease
High superheat and low discharge pressure
Technician B

39. Which of the following is a possible cause for a compressor to overheat...
Rise more than normal
A low refrigerant charge
An increase in low-side pressure
Run with high head and high suction pressure

40. A compressor having tight bearings would cause the current value to...
Rise more than normal
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Low discharge pressure - high suction pressure - and low amp draw
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser

41. What are the operating pressures of an oil pressure safety switch...
The oil pump pressure and the crankcase pressure
Technician B
An overcharged system
The external equalizer could be plugged

42. If a rooftop air conditioning system does not have any means of low ambient protection - what will be two symptoms of the system when operating under a low ambient condition...
An increase in suction pressure and an increase in discharge pressure
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
High superheat and low discharge pressure
A start relay

43. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Technician B
High suction pressure and low superheat
An uninsulated suction line and a restricted metering device

44. A system that is operating with a clear sight glass shows...
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
The sight glass is full of liquid+the sight glass is full of gas
The external equalizer could be plugged
('Y' and 'C') and ('G' and 'C')

45. What are the symptoms of an air conditioning system that has a bad compressor discharge valve...
Low discharge pressure - high suction pressure - and low amp draw
Both technicians are incorrect
Always have some liquid present in the bulb and diaphragm
Broken rings+broken valves+seized bearings

46. What is the common cause of a compressor burnout...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
50-65
The oil pump pressure and the crankcase pressure
Contains a solenoid coil and one or more sets of contacts

47. 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
Technician A is correct
An overcharged system
An acid-core suction line drier
An open internal overload protector

48. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
An overcharged system
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
'G' to 'C'
Bad compressor valve

49. Which of the following could be the cause for a system's discharge and suction pressure being low...
The external equalizer could be plugged
An acid-core suction line drier
A restricted metering device
Both technicians are incorrect

50. What are the symptoms of an air conditioning system that has a low charge...
The low-side pressure will decrease and the evaporator coil will be partially frosted
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
50-65
An increase in suction pressure and an increase in discharge pressure

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NATE Air Conditioning Troubleshooting

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