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NATE Air Conditioning Troubleshooting

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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 types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
High suction pressure and low superheat
Short cycling and insufficient dehumidification
Condenser fans operating during a low ambient condition and a low suction pressure

2. 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...
Both technicians are correct
A restricted metering device
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Condenser fans operating during a low ambient condition and a low suction pressure

3. 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 blown fuse
High suction pressure and low superheat
An uninsulated TXV sensing bulb
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system

4. 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
Whenever necessary
It keeps a constant superheat in the evaporator
A dirty condenser - recirculation of condenser air - and a defective condenser fan

5. A commercial customer calls on a 90
The system has been overcharged+The system has air trapped in the condenser
A low refrigerant charge
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Low voltage and a faulty start relay

6. Why is it unsafe to operate an air conditioning system with a low charge...
An uninsulated suction line and a restricted metering device
A dirty condenser - recirculation of condenser air - and a defective condenser fan
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Rise more than normal

7. 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
Broken rings+broken valves+seized bearings
Both technicians are correct
Dirty condenser - bent condenser fins - and air recirculating over the condenser
An open internal overload protector

8. A commercial customer calls on a 90
The system has been overcharged+The system has air trapped in the condenser
Partially frosted evaporator and high superheat
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
An increase in low-side pressure

9. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
Short cycling and insufficient dehumidification
('Y' and 'C') and ('G' and 'C')
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
The oil pump pressure and the crankcase pressure

10. A hard-start kit consists of...
Both technicians are incorrect
Technician B
The sight glass is full of liquid+the sight glass is full of gas
A start capacitor and a solid-state relay

11. Insufficient airflow can be caused by...
A plugged filter drier
An increase of air leakage from ductwork
An undercharge and low ambient conditions
A start capacitor and a solid-state relay

12. Which of the following could be the cause for a system's discharge and suction pressure being low...
Short cycling and insufficient dehumidification
A restricted metering device
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

13. Which of the following is a possible cause for a compressor to overheat...
The sensing bulb at a lower temperature than the valve body
A low refrigerant charge
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
The sensing bulb at a lower temperature than the valve body

14. 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
Both technicians are incorrect
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Technician A is correct
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

15. 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 missing air filter+improper rotation of the indoor blower+blower too small
Technician B
110-120
An overcharged system

16. Why is it unsafe to operate an air conditioning system with a low charge...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Both technicians are incorrect
Partially frosted evaporator and high superheat

17. Which of the following will cause excessive discharge pressures on an air conditioning system...
50-65
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
The superheat will increase and the low-side pressure will decrease

18. 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...
Both technicians are incorrect
Condenser fans operating during a low ambient condition and a low suction pressure
20 to 30
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

19. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
Contains a solenoid coil and one or more sets of contacts
20 to 30
An uninsulated suction line and a restricted metering device
The low-side pressure will decrease and the evaporator coil will be partially frosted

20. A compressor motor starts and operates for a short period of time and cycles on the external overload protector. What are two possible problems that could cause this...
('Y' and 'C') and ('G' and 'C')
Low voltage and a faulty start relay
The sensing bulb at a lower temperature than the valve body
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

21. A system that uses a thermal electric expansion valve...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Low discharge pressure - high suction pressure - and low amp draw
A dirty condenser - recirculation of condenser air - and a defective condenser fan

22. A technician receives an air conditioning service call stating that the system is operating but isn't cooling properly. When the technician arrives - she notices that the compressor has recently been changed and it is an are-22 system. She checks the
Dirty condenser - bent condenser fins - and air recirculating over the condenser
An overcharged system
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
Technician A

23. When using a vapor-charged TXV bulb - it is necessary to have...
The sensing bulb at a lower temperature than the valve body
Evaporator and compressor
Short cycling and insufficient dehumidification
The external equalizer could be plugged

24. 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
Technician B
Evaporator and compressor
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
('Y' and 'C') and ('G' and 'C')

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
The external equalizer could be plugged
An undercharged system+insufficient airflow over the evaporator coil
The low-side pressure will decrease and the evaporator coil will be partially frosted

26. After a compressor motor has been severely burnt - What accessory must be added as an aid to rid the air conditioning system of acid...
The superheat will increase and the low-side pressure will decrease
Technician B
An acid-core suction line drier
A restricted metering device

27. What problem or problems can cause low discharge and suction pressure...
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
An undercharged system+insufficient airflow over the evaporator coil
Lack of airflow
An uninsulated TXV sensing bulb

28. What is the purpose of the TXV...
A missing air filter+improper rotation of the indoor blower+blower too small
Condenser fans operating during a low ambient condition and a low suction pressure
Partially frosted evaporator and high superheat
It keeps a constant superheat in the evaporator

29. What are three methods for controlling a system's high-side pressure during low ambient conditions...
The oil pump pressure and the crankcase pressure
The internal overload is opened
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Flooding the condenser - cycling condenser fans - and dampering condenser air

30. A hard-start kit consists of...
3 psig
A plugged filter drier
A start capacitor and a solid-state relay
Technician B

31. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
It is used to control refrigerant pressure in the compressor crankcase
Bad compressor valve
Flooding the condenser - cycling condenser fans - and dampering condenser air
Technician B

32. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
Clean the condenser coil
Lack of airflow
A low refrigerant charge
The superheat will increase and the low-side pressure will decrease

33. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
A low refrigerant charge
An undercharged system+insufficient airflow over the evaporator coil
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser

34. A compressor having tight bearings would cause the current value to...
A plugged filter drier
Rise more than normal
Contains a solenoid coil and one or more sets of contacts
Technician B

35. Technician A says that if you connect 208 volts to the primary side of a 240-volt/ 24-volt transformer - the transformer will burn out. Technician B says that if you connect 208 volts to the primary side of a 240-volt/24-volt transformer - the contro
Bad compressor valve
Technician B
Low superheat
Dirty condenser - bent condenser fins - and air recirculating over the condenser

36. What three things can prevent an air conditioning system from releasing heat at the proper rate...
An increase of air leakage from ductwork
A dirty condenser - recirculation of condenser air - and a defective condenser fan
The sensing bulb at a lower temperature than the valve body
Low voltage and a faulty start relay

37. What are the operating pressures of an oil pressure safety switch...
An increase in suction pressure and an increase in discharge pressure
The oil pump pressure and the crankcase pressure
Flooding the condenser - cycling condenser fans - and dampering condenser air
Technician B

38. Which of the following is a common cause of an excessively low superheat on a TXV system...
Both technicians are correct
Technician B
Always have some liquid present in the bulb and diaphragm
A sensing bulb improperly connected to the suction line

39. What are three methods for controlling a system's high-side pressure during low ambient conditions...
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Flooding the condenser - cycling condenser fans - and dampering condenser air
Contains a solenoid coil and one or more sets of contacts
It is used to control refrigerant pressure in the compressor crankcase

40. A system that is operating with a clear sight glass shows...
An open internal overload protector
The sight glass is full of liquid+the sight glass is full of gas
The system has been overcharged+The system has air trapped in the condenser
Contains a solenoid coil and one or more sets of contacts

41. 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
Technician B
An increase in low-side pressure
Condenser fans operating during a low ambient condition and a low suction pressure
An uninsulated TXV sensing bulb

42. What are the symptoms of an air conditioning system that has a bad compressor discharge valve...
Evaporator and compressor
Low discharge pressure - high suction pressure - and low amp draw
An increase in suction pressure and an increase in discharge pressure
An overcharged system

43. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...
Technician B
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
An overcharged system
An increase in suction pressure and an increase in discharge pressure

44. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90
An increase in low-side pressure
110-120
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
A restricted metering device

45. 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...
Technician B
The internal overload is opened
110-120
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

46. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
An undercharge and low ambient conditions
The superheat will increase and the low-side pressure will decrease
50-65
Technician B

47. What are the symptoms of an air conditioning system that has a bad compressor discharge valve...
Technician B
('Y' and 'C') and ('G' and 'C')
Low discharge pressure - high suction pressure - and low amp draw
A bad thermostat

48. 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
Clean the condenser coil
Lack of airflow
Technician B
An increase in suction pressure and an increase in discharge pressure

49. What are common methods that are used for leak-testing a system...
A vacuum test+oil traces around fittings+soap bubble solution
Low voltage and a faulty start relay
An increase of air leakage from ductwork
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

50. What component is most often the cause of a start capacitor failure...
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
A start relay
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

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NATE Air Conditioning Troubleshooting

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