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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.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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 commercial customer calls on a 90
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
A defective circuit breaker
The system has been overcharged+The system has air trapped in the condenser
An uninsulated TXV sensing bulb

2. What are the symptoms of an air conditioning system that has a low charge...
High superheat and low discharge pressure
The low-side pressure will decrease and the evaporator coil will be partially frosted
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Low discharge pressure - high suction pressure - and low amp draw

3. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
'G' to 'C'
High superheat and low discharge pressure
A bad thermostat
3 psig

4. What type of problems can be caused by an oversized air conditioning system...
Short cycling and insufficient dehumidification
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
A missing air filter+improper rotation of the indoor blower+blower too small

5. 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
'G' to 'C'
The sensing bulb at a lower temperature than the valve body
A defective circuit breaker
An increase in low-side pressure

6. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
Broken rings+broken valves+seized bearings
Broken rings+broken valves+seized bearings
Technician A
20 to 30

7. What problem can cause an increase of discharge pressure and an increase of suction pressure...
Technician B
Technician B
An overcharged system
Low superheat

8. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Technician B
An increase in suction pressure and an increase in discharge pressure
An increase in low-side pressure

9. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
The external equalizer could be plugged
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
An increase of air leakage from ductwork
The superheat increases and the subcooling decreases

10. When using a vapor-charged TXV bulb - it is necessary to have...
An increase in low-side pressure
Increases starting torque
The sensing bulb at a lower temperature than the valve body
Technician B

11. What are two common symptoms of refrigerant leaks in an air conditioning system...
Partially frosted evaporator and high superheat
A low refrigerant charge
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
Low voltage and a faulty start relay

12. Which of the following problems can cause a decrease in a system's pressures and possible icing of the evaporator coil...
A missing air filter+improper rotation of the indoor blower+blower too small
Low discharge pressure - high suction pressure - and low amp draw
Low voltage and a faulty start relay
The superheat will increase and the low-side pressure will decrease

13. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
High superheat and low discharge pressure
'G' to 'C'
('Y' and 'C') and ('G' and 'C')
Lack of airflow

14. What are two common symptoms of refrigerant leaks in an air conditioning system...
Partially frosted evaporator and high superheat
Technician B
The internal overload is opened
A sensing bulb improperly connected to the suction line

15. Which of the following could be the cause for a system's discharge and suction pressure being low...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Technician B
A restricted metering device
The superheat increases and the subcooling decreases

16. 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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17. 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
A start capacitor and a solid-state relay
Both technicians are incorrect
Contains a solenoid coil and one or more sets of contacts

18. A liquid-charged TXV bulb will...
('Y' and 'C') and ('G' and 'C')
Technician B
3 psig
Always have some liquid present in the bulb and diaphragm

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
Broken rings+broken valves+seized bearings
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
A dirty condenser - recirculation of condenser air - and a defective condenser fan
An overcharged system

20. Superheat is found in an air conditioning system in the...
A defective circuit breaker
Evaporator and compressor
Both technicians are incorrect
Both technicians are incorrect

21. 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
An increase in low-side pressure
Technician B
The sight glass is full of liquid+the sight glass is full of gas
Lack of airflow

22. What are two problems that can cause an air conditioning system to have an excessively high superheat...
A bad thermostat
An increase in suction pressure and an increase in discharge pressure
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

23. Which of the following can cause excessive subcooling...
Both technicians are incorrect
An overcharged system
It keeps a constant superheat in the evaporator
A blown fuse

24. What type of problems can be caused by an oversized air conditioning system...
Short cycling and insufficient dehumidification
Run with high head and high suction pressure
The sight glass is full of liquid+the sight glass is full of gas
The superheat increases and the subcooling decreases

25. The internal overload of an air conditioning compressor senses winding temperature and...
Low voltage and a faulty start relay
Current in the compressor circuit
Partially frosted evaporator and high superheat
20 to 30

26. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...
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
The superheat will increase and the low-side pressure will decrease
A missing air filter+improper rotation of the indoor blower+blower too small

27. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
An increase of air leakage from ductwork
('Y' and 'C') and ('G' and 'C')
An undercharged system+insufficient airflow over the evaporator coil

28. An air conditioning system using a fixed-orifice metering device and with noncondensables in the system will cause...
Run with high head and high suction pressure
50-65
A bad thermostat
Technician B

29. An air conditioning system using a fixed-orifice metering device and with noncondensables in the system will cause...
Run with high head and high suction pressure
High suction pressure and low superheat
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor

30. 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
An increase of air leakage from ductwork
The sensing bulb at a lower temperature than the valve body
Technician A is correct
An overcharged system

31. Which of the following can cause low superheat in a TXV system...
An uninsulated TXV sensing bulb
Rise more than normal
The sight glass is full of liquid+the sight glass is full of gas
Technician A is correct

32. What is the common cause of a compressor burnout...
Increases starting torque
Both technicians are correct
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Both technicians are correct

33. 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
Current in the compressor circuit
Broken rings+broken valves+seized bearings
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
A sensing bulb improperly connected to the suction line

34. A system that uses a thermal electric expansion valve...
A start capacitor and a solid-state relay
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
A start relay
A sensing bulb improperly connected to the suction line

35. 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
20 to 30
An open internal overload protector
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Condenser fans operating during a low ambient condition and a low suction pressure

36. The internal overload of an air conditioning compressor senses winding temperature and...
Current in the compressor circuit
An overcharged system
A bad thermostat
An uninsulated suction line and a restricted metering device

37. What is the purpose of the TXV...
High suction pressure and low superheat
High suction pressure and low superheat
It keeps a constant superheat in the evaporator
A vacuum test+oil traces around fittings+soap bubble solution

38. 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 B
The external equalizer could be plugged
Technician A
An undercharged system+insufficient airflow over the evaporator coil

39. A system that uses a thermal electric expansion valve...
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Contains a solenoid coil and one or more sets of contacts
The discharge pressure increases and the amperage increases
50-65

40. A restricted air filter in an air conditioning system can be identified by...
Short cycling and insufficient dehumidification
A sensing bulb improperly connected to the suction line
Low superheat
It is used to control refrigerant pressure in the compressor crankcase

41. 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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42. A customer calls with an insufficient cooling complaint on a 90
3 psig
The superheat increases and the subcooling decreases
A start relay
Technician B

43. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90
An uninsulated suction line and a restricted metering device
Clean the condenser coil
110-120
A blown fuse

44. 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
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Technician A is correct
A dirty condenser - recirculation of condenser air - and a defective condenser fan
An acid-core suction line drier

45. 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
Low voltage and a faulty start relay
The oil pump pressure and the crankcase pressure
('Y' and 'C') and ('G' and 'C')

46. 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
Evaporator and compressor
Lack of airflow
Technician B
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

47. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...
Technician B
Condenser fans operating during a low ambient condition and a low suction pressure
A plugged filter drier
Dirty condenser - bent condenser fins - and air recirculating over the condenser

48. What is the purpose of an EPR valve...
('Y' and 'C') and ('G' and 'C')
110-120
Both technicians are incorrect
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system

49. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.
3 psig
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
The discharge pressure increases and the amperage increases
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser

50. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Contains a solenoid coil and one or more sets of contacts
The sight glass is full of liquid+the sight glass is full of gas
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

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NATE Air Conditioning Troubleshooting

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