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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. The temperature range of the suction line from an air conditioning system should be...
50-65
A bad thermostat
An acid-core suction line drier
An overcharged system

2. What are the operating pressures of an oil pressure safety switch...
The oil pump pressure and the crankcase pressure
A sensing bulb improperly connected to the suction line
A defective circuit breaker
The superheat will increase and the low-side pressure will decrease

3. 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 open internal overload protector
Technician A is correct
An undercharged system+insufficient airflow over the evaporator coil
Clean the condenser coil

4. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
20 to 30
The superheat will increase and the low-side pressure will decrease
3 psig
Both technicians are incorrect

5. Which of the following could be the cause for a system's discharge and suction pressure being low...
A restricted metering device
The oil pump pressure and the crankcase pressure
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
An overcharged system

6. When troubleshooting a split-system air conditioner - it is found that the compressor motor is humming but not starting. Technician A says that it could be an open internal overload protector. Technician B says that it could be a blown fuse. Which te
Technician B
Both technicians are incorrect
Technician B
3 psig

7. A customer calls with an insufficient cooling complaint on a 90
('Y' and 'C') and ('G' and 'C')
A restricted metering device
Technician B
The sight glass is full of liquid+the sight glass is full of gas

8. A party-store owner tried to adjust the water valve on his water-cooled condensing unit - then he called for assistance from an HVAC/are service technician. It was found that when servicing the unit - the outlet water temperature was too low. Technic
A vacuum test+oil traces around fittings+soap bubble solution
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Technician B
Short cycling and insufficient dehumidification

9. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
A start relay
A start capacitor and a solid-state relay
High suction pressure and low superheat
Technician B

10. Insufficient airflow can be caused by...
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
It would cause the low-side pressure to decrease
An increase of air leakage from ductwork
Condenser fans operating during a low ambient condition and a low suction pressure

11. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
'G' to 'C'
Dirty condenser - bent condenser fins - and air recirculating over the condenser
3 psig
Technician B

12. What is the purpose of the TXV...
Technician B
It keeps a constant superheat in the evaporator
Low discharge pressure - high suction pressure - and low amp draw
Low discharge pressure - high suction pressure - and low amp draw

13. What problem can cause an increase of discharge pressure and an increase of suction pressure...
Low discharge pressure - high suction pressure - and low amp draw
An overcharged system
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Flooding the condenser - cycling condenser fans - and dampering condenser air

14. A system that uses a thermal electric expansion valve...
3 psig
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
An open internal overload protector
'G' to 'C'

15. What are two common symptoms of refrigerant leaks in an air conditioning system...
Both technicians are correct
A start capacitor and a solid-state relay
A start capacitor and a solid-state relay
Partially frosted evaporator and high superheat

16. A system that is being serviced has been evacuated down to 500 microns. When the gauges are closed and the vacuum pump is turned off - the pressure starts to increase and stops at 1000 microns. Technician A says that the system has a leak and needs t
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Broken rings+broken valves+seized bearings
Technician B
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

17. Which of the following can cause excessive subcooling...
Bad compressor valve
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
An overcharged system
110-120

18. 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 overcharged system
A start relay
High superheat and low discharge pressure
Flooding the condenser - cycling condenser fans - and dampering condenser air

19. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90
110-120
A sensing bulb improperly connected to the suction line
Rise more than normal
Bad compressor valve

20. What are the symptoms of an air conditioning system that has a bad compressor discharge valve...
Technician B
Low discharge pressure - high suction pressure - and low amp draw
A start relay
A vacuum test+oil traces around fittings+soap bubble solution

21. Superheat is found in an air conditioning system in the...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Evaporator and compressor
Lack of airflow
An acid-core suction line drier

22. What is a possible cause of a sweat or frost pattern downstream from a sight glass and filter dryer...
Evaporator and compressor
A plugged filter drier
Both technicians are incorrect
A bad thermostat

23. 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
Condenser fans operating during a low ambient condition and a low suction pressure
Technician A
A bad thermostat
110-120

24. Which of the following can cause low superheat in a TXV system...
An increase in suction pressure and an increase in discharge pressure
20 to 30
An uninsulated TXV sensing bulb
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser

25. 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
Short cycling and insufficient dehumidification
20 to 30
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

26. What are the symptoms of an air conditioning system that has a low charge...
The external equalizer could be plugged
Technician B
The low-side pressure will decrease and the evaporator coil will be partially frosted
A defective circuit breaker

27. Which of the following problems can cause a decrease in a system's pressures and possible icing of the evaporator coil...
Technician B
Lack of airflow
Broken rings+broken valves+seized bearings
A missing air filter+improper rotation of the indoor blower+blower too small

28. 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
Technician B
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Technician B
A defective circuit breaker

29. Which of the following can cause low superheat in a TXV system...
An uninsulated TXV sensing bulb
An increase of air leakage from ductwork
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Clean the condenser coil

30. A compressor having tight bearings would cause the current value to...
Partially frosted evaporator and high superheat
An overcharged system
Rise more than normal
Current in the compressor circuit

31. 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...
The internal overload is opened
An open internal overload protector
A sensing bulb improperly connected to the suction line
Low discharge pressure - high suction pressure - and low amp draw

32. What are two problems that can cause an air conditioning system to have an excessively high superheat...
Dirty condenser - bent condenser fins - and air recirculating over the condenser
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
An uninsulated suction line and a restricted metering device

33. When using a vapor-charged TXV bulb - it is necessary to have...
A low refrigerant charge
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
The sensing bulb at a lower temperature than the valve body
110-120

34. 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 overcharged system
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Bad compressor valve
An open internal overload protector

35. What are common methods that are used for leak-testing a system...
A start capacitor and a solid-state relay
Broken rings+broken valves+seized bearings
A vacuum test+oil traces around fittings+soap bubble solution
Technician B

36. The best description of a relay would be...
It is used to control refrigerant pressure in the compressor crankcase
Technician B
Contains a solenoid coil and one or more sets of contacts
A plugged filter drier

37. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
Contains a solenoid coil and one or more sets of contacts
Evaporator and compressor
The superheat increases and the subcooling decreases
An undercharged system+insufficient airflow over the evaporator coil

38. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
The low-side pressure will decrease and the evaporator coil will be partially frosted
An overcharged system
The sensing bulb at a lower temperature than the valve body
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

39. A customer who owns a split air conditioning system complains that his system has been running but his house doesn't seem to be cooling properly. When the service technician arrives on the job - he or she finds that the indoor blower is operating and
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Clean the condenser coil
Both technicians are incorrect

40. What are common methods that are used for leak-testing a system...
Low voltage and a faulty start relay
A blown fuse
A vacuum test+oil traces around fittings+soap bubble solution
High superheat and low discharge pressure

41. A party-store owner tried to adjust the water valve on his water-cooled condensing unit - then he called for assistance from an HVAC/are service technician. It was found that when servicing the unit - the outlet water temperature was too low. Technic
A restricted metering device
Technician B
'G' to 'C'
An increase of air leakage from ductwork

42. 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
The sensing bulb at a lower temperature than the valve body
Technician B
The superheat increases and the subcooling decreases

43. A liquid-charged TXV bulb will...
Increases starting torque
Short cycling and insufficient dehumidification
High superheat and low discharge pressure
Always have some liquid present in the bulb and diaphragm

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

45. What component is most often the cause of a start capacitor failure...
Bad compressor valve
An undercharge and low ambient conditions
Short cycling and insufficient dehumidification
A start relay

46. Why is it unsafe to operate an air conditioning system with a low charge...
An undercharged system+insufficient airflow over the evaporator coil
An undercharged system+insufficient airflow over the evaporator coil
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
3 psig

47. 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
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
An overcharged system
Technician B

48. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
Lack of airflow
Both technicians are correct
A blown fuse
'G' to 'C'

49. 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...
The internal overload is opened
An overcharged system
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
50-65

50. 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
Both technicians are correct
Both technicians are incorrect
Evaporator and compressor
Technician B

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NATE Air Conditioning Troubleshooting

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