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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...
Technician B
An increase in low-side pressure
Low voltage and a faulty start relay
Technician B

2. What are two common symptoms of refrigerant leaks in an air conditioning system...
Partially frosted evaporator and high superheat
Technician B
High suction pressure and low superheat
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser

3. 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
Contains a solenoid coil and one or more sets of contacts
Technician B
A vacuum test+oil traces around fittings+soap bubble solution
Technician A is correct

4. A liquid-charged TXV bulb will...
Flooding the condenser - cycling condenser fans - and dampering condenser air
The oil pump pressure and the crankcase pressure
Always have some liquid present in the bulb and diaphragm
The superheat will increase and the low-side pressure will decrease

5. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
Lack of airflow
20 to 30
High superheat and low discharge pressure
Low superheat

6. What component is most often the cause of a start capacitor failure...
An increase in low-side pressure
A start relay
Low superheat
High superheat and low discharge pressure

7. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
Condenser fans operating during a low ambient condition and a low suction pressure
The discharge pressure increases and the amperage increases
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Evaporator and compressor

8. Insufficient airflow can be caused by...
An increase of air leakage from ductwork
Evaporator and compressor
3 psig
Increases starting torque

9. 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
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
The external equalizer could be plugged
An increase of air leakage from ductwork
The sensing bulb at a lower temperature than the valve body

10. 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
Both technicians are incorrect
A missing air filter+improper rotation of the indoor blower+blower too small
The low-side pressure will decrease and the evaporator coil will be partially frosted

11. What are the symptoms of a TXV air conditioning system if it has lost its charge...
Condenser fans operating during a low ambient condition and a low suction pressure
Lack of airflow
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
The superheat will increase and the low-side pressure will decrease

12. Which of the following is a common cause of an excessively low superheat on a TXV system...
An uninsulated TXV sensing bulb
A low refrigerant charge
A sensing bulb improperly connected to the suction line
Technician B

13. 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
A missing air filter+improper rotation of the indoor blower+blower too small
The system has been overcharged+The system has air trapped in the condenser
Both technicians are incorrect
('Y' and 'C') and ('G' and 'C')

14. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
An uninsulated suction line and a restricted metering device
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Low discharge pressure - high suction pressure - and low amp draw
High suction pressure and low superheat

15. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
Evaporator and compressor
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
It would cause the low-side pressure to decrease

16. What are the symptoms of a TXV air conditioning system if it has lost its charge...
The discharge pressure increases and the amperage increases
The superheat will increase and the low-side pressure will decrease
Both technicians are correct
Condenser fans operating during a low ambient condition and a low suction pressure

17. 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...
Technician B
A missing air filter+improper rotation of the indoor blower+blower too small
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
High superheat and low discharge pressure

18. 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
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Technician B
A start relay
A missing air filter+improper rotation of the indoor blower+blower too small

19. A system that uses a thermal electric expansion valve...
Low discharge pressure - high suction pressure - and low amp draw
A defective circuit breaker
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Always have some liquid present in the bulb and diaphragm

20. 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
The sensing bulb at a lower temperature than the valve body
An uninsulated TXV sensing bulb
A low refrigerant charge

21. What problem can cause an increase of discharge pressure and an increase of suction pressure...
The oil pump pressure and the crankcase pressure
The discharge pressure increases and the amperage increases
An overcharged system
Evaporator and compressor

22. The best description of a relay would be...
3 psig
An acid-core suction line drier
An undercharged system+insufficient airflow over the evaporator coil
Contains a solenoid coil and one or more sets of contacts

23. 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
'G' to 'C'
'G' to 'C'
A blown fuse
An open internal overload protector

24. 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
20 to 30
Technician B
A bad thermostat
The superheat will increase and the low-side pressure will decrease

25. 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
Broken rings+broken valves+seized bearings
An increase in low-side pressure
Rise more than normal
It is used to control refrigerant pressure in the compressor crankcase

26. Air filters should be replaced...
'G' to 'C'
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Whenever necessary
Technician B

27. 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...
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
High superheat and low discharge pressure
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
A defective circuit breaker

28. What is the purpose of the TXV...
Partially frosted evaporator and high superheat
It keeps a constant superheat in the evaporator
20 to 30
Current in the compressor circuit

29. What three things can prevent an air conditioning system from releasing heat at the proper rate...
Contains a solenoid coil and one or more sets of contacts
The low-side pressure will decrease and the evaporator coil will be partially frosted
An increase of air leakage from ductwork
A dirty condenser - recirculation of condenser air - and a defective condenser fan

30. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
Bad compressor valve
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Low superheat
Both technicians are incorrect

31. What is the purpose of the TXV...
The system has been overcharged+The system has air trapped in the condenser
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
It keeps a constant superheat in the evaporator

32. 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
Technician A is correct
Both technicians are incorrect
'G' to 'C'

33. What are the symptoms of an air conditioning system that has a bad compressor discharge valve...
High superheat and low discharge pressure
Evaporator and compressor
Low discharge pressure - high suction pressure - and low amp draw
'G' to 'C'

34. What type of problems can be caused by an oversized air conditioning system...
Technician B
An increase in suction pressure and an increase in discharge pressure
An increase of air leakage from ductwork
Short cycling and insufficient dehumidification

35. An air conditioning system using a fixed-orifice metering device and with noncondensables in the system will cause...
Run with high head and high suction pressure
The system has been overcharged+The system has air trapped in the condenser
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

36. 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
It would cause the low-side pressure to decrease
Broken rings+broken valves+seized bearings
A start relay
Increases starting torque

37. What are common methods that are used for leak-testing a system...
A vacuum test+oil traces around fittings+soap bubble solution
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
The oil pump pressure and the crankcase pressure
An open internal overload protector

38. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
Current in the compressor circuit
Run with high head and high suction pressure
3 psig
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

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
Technician A is correct
Clean the condenser coil
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser

40. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
An increase in suction pressure and an increase in discharge pressure
20 to 30
An uninsulated suction line and a restricted metering device
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

41. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90
The system has been overcharged+The system has air trapped in the condenser
110-120
An acid-core suction line drier
A vacuum test+oil traces around fittings+soap bubble solution

42. A restricted air filter in an air conditioning system can be identified by...
The superheat increases and the subcooling decreases
A plugged filter drier
A plugged filter drier
Low superheat

43. Which of the following problems can cause a decrease in a system's pressures and possible icing of the evaporator coil...
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
A missing air filter+improper rotation of the indoor blower+blower too small
The low-side pressure will decrease and the evaporator coil will be partially frosted
It would cause the low-side pressure to decrease

44. What is the purpose of a CPR valve...
It is used to control refrigerant pressure in the compressor crankcase
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
A start relay
It would cause the low-side pressure to decrease

45. What is the common cause of a compressor burnout...
A missing air filter+improper rotation of the indoor blower+blower too small
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Short cycling and insufficient dehumidification

46. What is a possible cause of a sweat or frost pattern downstream from a sight glass and filter dryer...
Technician A
An overcharged system
High superheat and low discharge pressure
A plugged filter drier

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
A low refrigerant charge
Technician B
It is used to control refrigerant pressure in the compressor crankcase
Low superheat

48. 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
Condenser fans operating during a low ambient condition and a low suction pressure
An increase of air leakage from ductwork
Both technicians are correct
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser

49. What is a possible cause of a sweat or frost pattern downstream from a sight glass and filter dryer...
It would cause the low-side pressure to decrease
Short cycling and insufficient dehumidification
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
A plugged filter drier

50. What is the purpose of an EPR valve...
A low refrigerant charge
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
An overcharged system
The sensing bulb at a lower temperature than the valve body

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NATE Air Conditioning Troubleshooting

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