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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 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...
Low voltage and a faulty start relay
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
It keeps a constant superheat in the evaporator
A blown fuse

2. What causes the automatic expansion valve to close...
The internal overload is opened
An increase in low-side pressure
The oil pump pressure and the crankcase pressure
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

3. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
The superheat increases and the subcooling decreases
The oil pump pressure and the crankcase pressure
An increase in suction pressure and an increase in discharge pressure

4. 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...
'G' to 'C'
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Technician B
Low voltage and a faulty start relay

5. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
An uninsulated TXV sensing bulb
Dirty condenser - bent condenser fins - and air recirculating over the condenser
A missing air filter+improper rotation of the indoor blower+blower too small
3 psig

6. 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
Technician B
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
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

7. What problem or problems can cause low discharge and suction pressure...
A blown fuse
A restricted metering device
A missing air filter+improper rotation of the indoor blower+blower too small
An undercharged system+insufficient airflow over the evaporator coil

8. Which of the following will cause excessive discharge pressures on an air conditioning system...
An undercharged system+insufficient airflow over the evaporator coil
3 psig
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Partially frosted evaporator and high superheat

9. 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 low-side pressure will decrease and the evaporator coil will be partially frosted
Broken rings+broken valves+seized bearings
A start capacitor and a solid-state relay

10. What are common methods that are used for leak-testing a system...
Flooding the condenser - cycling condenser fans - and dampering condenser air
Technician B
A vacuum test+oil traces around fittings+soap bubble solution
A missing air filter+improper rotation of the indoor blower+blower too small

11. A system that uses a thermal electric expansion valve...
The oil pump pressure and the crankcase pressure
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
An overcharged system
A plugged filter drier

12. 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
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
An overcharged system
It would cause the low-side pressure to decrease

13. Insufficient airflow can be caused by...
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
An increase of air leakage from ductwork
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
An open internal overload protector

14. What is the purpose of an EPR valve...
Technician B
('Y' and 'C') and ('G' and 'C')
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
It is used to control refrigerant pressure in the compressor crankcase

15. A liquid-charged TXV bulb will...
Always have some liquid present in the bulb and diaphragm
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
110-120

16. What is the common cause of a compressor burnout...
110-120
Both technicians are incorrect
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
A sensing bulb improperly connected to the suction line

17. A customer calls with an insufficient cooling complaint on a 90
Increases starting torque
Technician B
A missing air filter+improper rotation of the indoor blower+blower too small
A start capacitor and a solid-state relay

18. 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
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
High suction pressure and low superheat
An overcharged system

19. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
The sensing bulb at a lower temperature than the valve body
Partially frosted evaporator and high superheat
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
A defective circuit breaker

20. Why is it unsafe to operate an air conditioning system with a low charge...
Broken rings+broken valves+seized bearings
It keeps a constant superheat in the evaporator
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

21. 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
3 psig
Low discharge pressure - high suction pressure - and low amp draw
Increases starting torque

22. The internal overload of an air conditioning compressor senses winding temperature and...
20 to 30
It would cause the low-side pressure to decrease
Current in the compressor circuit
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system

23. 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
'G' to 'C'
Both technicians are correct
The discharge pressure increases and the amperage increases
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

24. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
The sensing bulb at a lower temperature than the valve body
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Current in the compressor circuit
The superheat will increase and the low-side pressure will decrease

25. 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...
A missing air filter+improper rotation of the indoor blower+blower too small
Rise more than normal
3 psig
High superheat and low discharge pressure

26. A commercial customer calls on a 90
The system has been overcharged+The system has air trapped in the condenser
The internal overload is opened
Evaporator and compressor
The superheat increases and the subcooling decreases

27. Which of the following will cause excessive discharge pressures on an 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
The external equalizer could be plugged
110-120
An increase in low-side pressure

28. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Current in the compressor circuit
Both technicians are incorrect
Lack of airflow

29. Why is it unsafe to operate an air conditioning system with a low charge...
Bad compressor valve
Contains a solenoid coil and one or more sets of contacts
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Flooding the condenser - cycling condenser fans - and dampering condenser air

30. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
High suction pressure and low superheat
Bad compressor valve
Evaporator and compressor
High superheat and low discharge pressure

31. 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
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
An acid-core suction line drier
Technician B

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 start capacitor and a solid-state relay
Technician A is correct
Technician A
Low voltage and a faulty start relay

33. 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...
Technician B
Technician A is correct
The oil pump pressure and the crankcase pressure
A blown fuse

34. What component is most often the cause of a start capacitor failure...
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
A start relay
High superheat and low discharge pressure
Both technicians are incorrect

35. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
Low superheat
Lack of airflow
Broken rings+broken valves+seized bearings
An overcharged system

36. What are common methods that are used for leak-testing a system...
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Low voltage and a faulty start relay
Technician B
A vacuum test+oil traces around fittings+soap bubble solution

37. A liquid-charged TXV bulb will...
Always have some liquid present in the bulb and diaphragm
Increases starting torque
3 psig
Technician A

38. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
110-120
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
An open internal overload protector
An increase of air leakage from ductwork

39. A restricted air filter in an air conditioning system can be identified by...
A missing air filter+improper rotation of the indoor blower+blower too small
Low superheat
The sensing bulb at a lower temperature than the valve body
A start capacitor and a solid-state relay

40. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...
3 psig
Low voltage and a faulty start relay
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
110-120

41. A restricted air filter in an air conditioning system can be identified by...
Low superheat
A start capacitor and a solid-state relay
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Short cycling and insufficient dehumidification

42. Which of the following is a common cause of an excessively low superheat on a TXV system...
An uninsulated suction line and a restricted metering device
Low discharge pressure - high suction pressure - and low amp draw
Lack of airflow
A sensing bulb improperly connected to the suction line

43. 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...
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
A dirty condenser - recirculation of condenser air - and a defective condenser fan
A bad thermostat

44. 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
3 psig
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
Short cycling and insufficient dehumidification

45. What are the symptoms of a TXV air conditioning system if it has lost its charge...
The superheat will increase and the low-side pressure will decrease
('Y' and 'C') and ('G' and 'C')
Both technicians are correct
An undercharged system+insufficient airflow over the evaporator coil

46. 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
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
Technician A is correct
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Whenever necessary

47. 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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48. 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
Increases starting torque
An open internal overload protector
Both technicians are incorrect
It would cause the low-side pressure to decrease

49. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...
Technician B
An increase in suction pressure and an increase in discharge pressure
High suction pressure and low superheat
Clean the condenser coil

50. What are the symptoms of a TXV air conditioning system if it has lost its charge...
Both technicians are correct
An open internal overload protector
50-65
The superheat will increase and the low-side pressure will decrease

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NATE Air Conditioning Troubleshooting

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