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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. Which of the following could be the cause for a system's discharge and suction pressure being low...
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
A restricted metering device
The superheat increases and the subcooling decreases
The low-side pressure will decrease and the evaporator coil will be partially frosted

2. What three things can prevent an air conditioning system from releasing heat at the proper rate...
110-120
A dirty condenser - recirculation of condenser air - and a defective condenser fan
An increase of air leakage from ductwork
Both technicians are incorrect

3. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...
Contains a solenoid coil and one or more sets of contacts
An increase in suction pressure and an increase in discharge pressure
A start capacitor and a solid-state relay
A bad thermostat

4. The temperature range of the suction line from an air conditioning system should be...
Whenever necessary
20 to 30
110-120
50-65

5. A hard-start kit for an air conditioning system...
An uninsulated suction line and a restricted metering device
Technician B
50-65
Increases starting torque

6. 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
50-65
Low discharge pressure - high suction pressure - and low amp draw
Technician A
Both technicians are incorrect

7. 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
A missing air filter+improper rotation of the indoor blower+blower too small
An undercharged system+insufficient airflow over the evaporator coil
The discharge pressure increases and the amperage increases

8. 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
High suction pressure and low superheat
Technician A
Technician B

9. Which of the following can cause excessive subcooling...
The external equalizer could be plugged
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
An overcharged system
Evaporator and compressor

10. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
An increase in low-side pressure
Technician B
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Bad compressor valve

11. A hard-start kit consists of...
Partially frosted evaporator and high superheat
A start capacitor and a solid-state relay
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
A plugged filter drier

12. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
An increase in suction pressure and an increase in discharge pressure
Partially frosted evaporator and high superheat
The superheat increases and the subcooling decreases
A low refrigerant charge

13. A commercial customer calls on a 90
Low discharge pressure - high suction pressure - and low amp draw
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
The system has been overcharged+The system has air trapped in the condenser
110-120

14. 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
Clean the condenser coil
A vacuum test+oil traces around fittings+soap bubble solution
Condenser fans operating during a low ambient condition and a low suction pressure

15. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
Technician B
The system has been overcharged+The system has air trapped in the condenser
The superheat increases and the subcooling decreases
High suction pressure and low superheat

16. A hard-start kit for an air conditioning system...
20 to 30
A bad thermostat
Increases starting torque
Technician B

17. Which of the following is a common cause of an excessively low superheat on a TXV system...
An open internal overload protector
Whenever necessary
A sensing bulb improperly connected to the suction line
It is used to control refrigerant pressure in the compressor crankcase

18. Which of the following is a common cause of an excessively low superheat on a TXV system...
A start capacitor and a solid-state relay
Technician B
A sensing bulb improperly connected to the suction line
The discharge pressure increases and the amperage increases

19. 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
Technician B
A blown fuse
An uninsulated TXV sensing bulb

20. 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
A plugged filter drier
An uninsulated suction line and a restricted metering device
A defective circuit breaker
Technician B

21. What are common methods that are used for leak-testing a system...
A vacuum test+oil traces around fittings+soap bubble solution
Flooding the condenser - cycling condenser fans - and dampering condenser air
Evaporator and compressor
('Y' and 'C') and ('G' and 'C')

22. A commercial customer calls complaining that her rooftop air conditioning system is not operating. The technician arrives on the job and sets the thermostat to cooling - then notices that the indoor fan is not operating. The technician then sets the

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23. What type of problems can be caused by an oversized air conditioning system...
Short cycling and insufficient dehumidification
Dirty condenser - bent condenser fins - and air recirculating over the condenser
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
20 to 30

24. Which of the following will cause excessive discharge pressures on an air conditioning system...
An increase in low-side pressure
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
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

25. A customer calls with an insufficient cooling complaint. Upon arrival to the service call it is found that the outdoor condensing unit is operating - but the indoor blower is not in operation. Technician A says that it is possible that it is a bad fu
An uninsulated TXV sensing bulb
20 to 30
50-65
Both technicians are incorrect

26. Which of the following can cause low superheat in a TXV system...
An uninsulated TXV sensing bulb
A bad thermostat
High suction pressure and low superheat
Current in the compressor circuit

27. 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...
A sensing bulb improperly connected to the suction line
Low voltage and a faulty start relay
Clean the condenser coil
An acid-core suction line drier

28. 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
Both technicians are incorrect
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Bad compressor valve
Technician A is correct

29. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
The superheat increases and the subcooling decreases
3 psig
Both technicians are incorrect
The superheat will increase and the low-side pressure will decrease

30. What are three methods for controlling a system's high-side pressure during low ambient conditions...
A restricted metering device
Flooding the condenser - cycling condenser fans - and dampering condenser air
An uninsulated TXV sensing bulb
A start capacitor and a solid-state relay

31. What component is most often the cause of a start capacitor failure...
It would cause the low-side pressure to decrease
A start relay
Current in the compressor circuit
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

32. A liquid-charged TXV bulb will...
Technician B
Always have some liquid present in the bulb and diaphragm
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

33. An air conditioning system using a fixed-orifice metering device and with noncondensables in the system will cause...
An undercharge and low ambient conditions
High superheat and low discharge pressure
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Run with high head and high suction pressure

34. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.
A start relay
An increase in low-side pressure
The discharge pressure increases and the amperage increases
A start capacitor and a solid-state relay

35. After a compressor motor has been severely burnt - What accessory must be added as an aid to rid the air conditioning system of acid...
An uninsulated suction line and a restricted metering device
An acid-core suction line drier
A dirty condenser - recirculation of condenser air - and a defective condenser fan
It keeps a constant superheat in the evaporator

36. What causes the automatic expansion valve to close...
An open internal overload protector
An increase in low-side pressure
The oil pump pressure and the crankcase pressure
Broken rings+broken valves+seized bearings

37. A system that uses a thermal electric expansion valve...
Technician A is correct
Technician B
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
An overcharged system

38. What type of problems can be caused by an oversized air conditioning system...
Short cycling and insufficient dehumidification
An acid-core suction line drier
110-120
Lack of airflow

39. 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
An uninsulated suction line and a restricted metering device
The system has been overcharged+The system has air trapped in the condenser
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
Technician B

40. 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
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
A start capacitor and a solid-state relay
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

41. 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
An open internal overload protector
Both technicians are correct
Technician A is correct
Condenser fans operating during a low ambient condition and a low suction pressure

42. What is the purpose of an EPR valve...
Technician A
The internal overload is opened
A start relay
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system

43. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
A defective circuit breaker
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
A start capacitor and a solid-state relay
It keeps a constant superheat in the evaporator

44. 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
High superheat and low discharge pressure
It is used to control refrigerant pressure in the compressor crankcase
Contains a solenoid coil and one or more sets of contacts
Technician B

45. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
High superheat and low discharge pressure
The discharge pressure increases and the amperage increases
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Technician B

46. A customer calls with an insufficient cooling complaint on a 90
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Always have some liquid present in the bulb and diaphragm
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Technician B

47. 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
Low superheat
('Y' and 'C') and ('G' and 'C')
Technician A
A blown fuse

48. 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
Technician A
Both technicians are incorrect
Technician B
A start capacitor and a solid-state relay

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
The sight glass is full of liquid+the sight glass is full of gas
Broken rings+broken valves+seized bearings
Short cycling and insufficient dehumidification
A plugged filter drier

50. 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 open internal overload protector
The sight glass is full of liquid+the sight glass is full of gas
The oil pump pressure and the crankcase pressure
Low voltage and a faulty start relay

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NATE Air Conditioning Troubleshooting

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