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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. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...
A vacuum test+oil traces around fittings+soap bubble solution
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Technician B
A start capacitor and a solid-state relay

2. 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...
An overcharged system
An increase in suction pressure and an increase in discharge pressure
Low voltage and a faulty start relay
A restricted metering device

3. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
The superheat increases and the subcooling decreases
An increase in low-side pressure
An uninsulated TXV sensing bulb
Both technicians are incorrect

4. The temperature range of the suction line from an air conditioning system should be...
50-65
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
An acid-core suction line drier
Technician B

5. A commercial customer calls on a 90
A bad thermostat
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
An overcharged system
The system has been overcharged+The system has air trapped in the condenser

6. 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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7. 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
Broken rings+broken valves+seized bearings
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
A restricted metering device

8. A customer calls with an insufficient cooling complaint on a 90
A blown fuse
The superheat will increase and the low-side pressure will decrease
Technician B
An undercharged system+insufficient airflow over the evaporator coil

9. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Current in the compressor circuit
High suction pressure and low superheat
A bad thermostat

10. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
The sensing bulb at a lower temperature than the valve body
Bad compressor valve
It would cause the low-side pressure to decrease
It is used to control refrigerant pressure in the compressor crankcase

11. What is the purpose of an EPR valve...
20 to 30
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Always have some liquid present in the bulb and diaphragm

12. Insufficient airflow can be caused by...
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
An increase of air leakage from ductwork
An acid-core suction line drier
An increase in low-side pressure

13. 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 overcharged system
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
Both technicians are incorrect

14. 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
Increases starting torque
The external equalizer could be plugged
An open internal overload protector
Flooding the condenser - cycling condenser fans - and dampering condenser air

15. Which of the following will cause excessive discharge pressures on an air conditioning system...
Low discharge pressure - high suction pressure - and low amp draw
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
High superheat and low discharge pressure
An increase in suction pressure and an increase in discharge pressure

16. 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
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Increases starting torque
Condenser fans operating during a low ambient condition and a low suction pressure

17. The internal overload of an air conditioning compressor senses winding temperature and...
Current in the compressor circuit
110-120
High suction pressure and low superheat
The sight glass is full of liquid+the sight glass is full of gas

18. A compressor having tight bearings would cause the current value to...
Evaporator and compressor
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
The oil pump pressure and the crankcase pressure
Rise more than normal

19. What are common methods that are used for leak-testing a system...
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
A vacuum test+oil traces around fittings+soap bubble solution
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
An uninsulated suction line and a restricted metering device

20. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...
Technician A is correct
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Contains a solenoid coil and one or more sets of contacts
High suction pressure and low superheat

21. 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...
Both technicians are incorrect
An undercharge and low ambient conditions
Low voltage and a faulty start relay
The internal overload is opened

22. What is the purpose of a CPR valve...
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
It is used to control refrigerant pressure in the compressor crankcase
An uninsulated suction line and a restricted metering device
An increase of air leakage from ductwork

23. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
Technician A
High suction pressure and low superheat
Both technicians are incorrect
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

24. 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 system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Increases starting torque
The oil pump pressure and the crankcase pressure
An acid-core suction line drier

25. What are the symptoms of a TXV air conditioning system if it has lost its charge...
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
An undercharge and low ambient conditions
Current in the compressor circuit
The superheat will increase and the low-side pressure will decrease

26. 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 undercharged system+insufficient airflow over the evaporator coil
Always have some liquid present in the bulb and diaphragm
Technician B
The superheat will increase and the low-side pressure will decrease

27. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
An overcharged system
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Technician B
A defective circuit breaker

28. A hard-start kit consists of...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
An overcharged system
An uninsulated suction line and a restricted metering device
A start capacitor and a solid-state relay

29. What component is most often the cause of a start capacitor failure...
Technician B
Technician B
A start relay
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

30. After a compressor motor has been severely burnt - What accessory must be added as an aid to rid the air conditioning system of acid...
Technician B
An acid-core suction line drier
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Both technicians are incorrect

31. 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
Evaporator and compressor
It is used to control refrigerant pressure in the compressor crankcase
Bad compressor valve

32. 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
A vacuum test+oil traces around fittings+soap bubble solution
The low-side pressure will decrease and the evaporator coil will be partially frosted
Technician A
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

33. What type of problems can be caused by an oversized air conditioning system...
Short cycling and insufficient dehumidification
The oil pump pressure and the crankcase pressure
Technician B
Flooding the condenser - cycling condenser fans - and dampering condenser air

34. 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...
Technician B
The external equalizer could be plugged
An increase of air leakage from ductwork
Condenser fans operating during a low ambient condition and a low suction pressure

35. 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
Low discharge pressure - high suction pressure - and low amp draw
An increase in suction pressure and an increase in discharge pressure
The external equalizer could be plugged
A vacuum test+oil traces around fittings+soap bubble solution

36. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.
The internal overload is opened
The discharge pressure increases and the amperage increases
Partially frosted evaporator and high superheat
A low refrigerant charge

37. What causes the automatic expansion valve to close...
3 psig
An increase in low-side pressure
Whenever necessary
Clean the condenser coil

38. What is the purpose of a CPR valve...
Technician B
It is used to control refrigerant pressure in the compressor crankcase
The internal overload is opened
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

39. The best description of a relay would be...
Technician B
Contains a solenoid coil and one or more sets of contacts
Flooding the condenser - cycling condenser fans - and dampering condenser air
A bad thermostat

40. Which of the following could be the cause for a system's discharge and suction pressure being low...
Rise more than normal
Technician B
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
A restricted metering device

41. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...
The discharge pressure increases and the amperage increases
An increase in suction pressure and an increase in discharge pressure
Technician A
The system has been overcharged+The system has air trapped in the condenser

42. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
It is used to control refrigerant pressure in the compressor crankcase
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
20 to 30
It keeps a constant superheat in the evaporator

43. 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
Technician B
Technician A is correct
Both technicians are correct

44. Superheat is found in an air conditioning system in the...
20 to 30
Evaporator and compressor
An overcharged system
A sensing bulb improperly connected to the suction line

45. Which of the following can cause low superheat in a TXV system...
Condenser fans operating during a low ambient condition and a low suction pressure
An uninsulated TXV sensing bulb
A plugged filter drier
An increase of air leakage from ductwork

46. What are the operating pressures of an oil pressure safety switch...
Lack of airflow
The superheat will increase and the low-side pressure will decrease
The oil pump pressure and the crankcase pressure
Current in the compressor circuit

47. 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
Low voltage and a faulty start relay
Flooding the condenser - cycling condenser fans - and dampering condenser air
Technician B
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

48. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Condenser fans operating during a low ambient condition and a low suction pressure
20 to 30
It would cause the low-side pressure to decrease

49. A hard-start kit for an air conditioning system...
The system has been overcharged+The system has air trapped in the condenser
Flooding the condenser - cycling condenser fans - and dampering condenser air
High superheat and low discharge pressure
Increases starting torque

50. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
High suction pressure and low superheat
Always have some liquid present in the bulb and diaphragm
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Broken rings+broken valves+seized bearings

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NATE Air Conditioning Troubleshooting

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