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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...
Dirty condenser - bent condenser fins - and air recirculating over the condenser
The external equalizer could be plugged
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

2. 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
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Technician B
A plugged filter drier
Evaporator and compressor

3. What type of problems can be caused by an oversized air conditioning system...
An undercharged system+insufficient airflow over the evaporator coil
An overcharged system
Short cycling and insufficient dehumidification
Evaporator and compressor

4. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
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
Technician B

5. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
The discharge pressure increases and the amperage increases
A vacuum test+oil traces around fittings+soap bubble solution
('Y' and 'C') and ('G' and 'C')

6. 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
It keeps a constant superheat in the evaporator
Technician B
A low refrigerant charge
The external equalizer could be plugged

7. 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
Technician B
Both technicians are incorrect
Flooding the condenser - cycling condenser fans - and dampering condenser air
The external equalizer could be plugged

8. 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
It is used to control refrigerant pressure in the compressor crankcase
The discharge pressure increases and the amperage increases
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

9. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
An overcharged system
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
20 to 30

10. An air conditioning system that uses a fan center has an inoperable indoor blower. When the thermostat is set for cooling and dialed below room temperature - a test with the voltmeter shows that there is 24 volts across terminals 'are' and 'G' at the
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
A bad thermostat
An uninsulated suction line and a restricted metering device
High superheat and low discharge pressure

11. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
The oil pump pressure and the crankcase pressure
Lack of airflow
Technician A is correct
Technician B

12. A commercial customer calls on a 90
The system has been overcharged+The system has air trapped in the condenser
A low refrigerant charge
An overcharged system
An open internal overload protector

13. A hard-start kit for an air conditioning system...
A vacuum test+oil traces around fittings+soap bubble solution
The superheat will increase and the low-side pressure will decrease
A plugged filter drier
Increases starting torque

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
Partially frosted evaporator and high superheat
It keeps a constant superheat in the evaporator
Both technicians are incorrect
The external equalizer could be plugged

15. Which of the following could be the cause for a system's discharge and suction pressure being low...
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Clean the condenser coil
An acid-core suction line drier
A restricted metering device

16. 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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17. 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...
50-65
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
The internal overload is opened
The superheat will increase and the low-side pressure will decrease

18. What is a possible cause of a sweat or frost pattern downstream from a sight glass and filter dryer...
Low discharge pressure - high suction pressure - and low amp draw
A start capacitor and a solid-state relay
An undercharge and low ambient conditions
A plugged filter drier

19. What are two common symptoms of refrigerant leaks in an air conditioning system...
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
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
Partially frosted evaporator and high superheat

20. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
Always have some liquid present in the bulb and diaphragm
An undercharged system+insufficient airflow over the evaporator coil
The external equalizer could be plugged
20 to 30

21. Superheat is found in an air conditioning system in the...
Both technicians are correct
Evaporator and compressor
Whenever necessary
Both technicians are correct

22. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
Rise more than normal
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Lack of airflow
Both technicians are incorrect

23. A compressor having tight bearings would cause the current value to...
Low discharge pressure - high suction pressure - and low amp draw
The system has been overcharged+The system has air trapped in the condenser
Lack of airflow
Rise more than normal

24. 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
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Technician B
High suction pressure and low superheat

25. A customer calls with an insufficient cooling complaint on a 90
Technician B
Contains a solenoid coil and one or more sets of contacts
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
An increase in suction pressure and an increase in discharge pressure

26. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90
A vacuum test+oil traces around fittings+soap bubble solution
110-120
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
Low discharge pressure - high suction pressure - and low amp draw

27. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
Both technicians are correct
High suction pressure and low superheat
A restricted metering device
It is used to control refrigerant pressure in the compressor crankcase

28. 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
The low-side pressure will decrease and the evaporator coil will be partially frosted
Technician A
It would cause the low-side pressure to decrease
An undercharge and low ambient conditions

29. What are three methods for controlling a system's high-side pressure during low ambient conditions...
Bad compressor valve
A dirty condenser - recirculation of condenser air - and a defective condenser fan
A low refrigerant charge
Flooding the condenser - cycling condenser fans - and dampering condenser air

30. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...
A sensing bulb improperly connected to the suction line
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
It would cause the low-side pressure to decrease
An overcharged system

31. Which of the following is a common cause of an excessively low superheat on a TXV system...
Broken rings+broken valves+seized bearings
A sensing bulb improperly connected to the suction line
An uninsulated TXV sensing bulb
Evaporator and compressor

32. An air conditioning system that uses a fan center has an inoperable indoor blower. When the thermostat is set for cooling and dialed below room temperature - a test with the voltmeter shows that there is 24 volts across terminals 'are' and 'G' at the
A bad thermostat
Technician B
Technician B
Contains a solenoid coil and one or more sets of contacts

33. What problem or problems can cause low discharge and suction pressure...
A low refrigerant charge
An undercharged system+insufficient airflow over the evaporator coil
'G' to 'C'
Rise more than normal

34. What are common methods that are used for leak-testing a system...
Increases starting torque
An open internal overload protector
A vacuum test+oil traces around fittings+soap bubble solution
Technician B

35. Superheat is found in an air conditioning system in the...
Evaporator and compressor
An overcharged system
50-65
Both technicians are incorrect

36. What are the symptoms of an air conditioning system that has a bad compressor discharge valve...
A missing air filter+improper rotation of the indoor blower+blower too small
Current in the compressor circuit
Technician A
Low discharge pressure - high suction pressure - and low amp draw

37. 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
A dirty condenser - recirculation of condenser air - and a defective condenser fan
An increase in suction pressure and an increase in discharge pressure
An overcharged system

38. What causes the automatic expansion valve to close...
An increase in low-side pressure
Both technicians are incorrect
High superheat and low discharge pressure
('Y' and 'C') and ('G' and 'C')

39. 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
Technician B
A defective circuit breaker
3 psig
Contains a solenoid coil and one or more sets of contacts

40. A restricted air filter in an air conditioning system can be identified by...
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
A vacuum test+oil traces around fittings+soap bubble solution
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Low superheat

41. 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
A sensing bulb improperly connected to the suction line
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Dirty condenser - bent condenser fins - and air recirculating over the condenser

42. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
An undercharge and low ambient conditions
Whenever necessary
The external equalizer could be plugged
It would cause the low-side pressure to decrease

43. A system that uses a thermal electric expansion valve...
A plugged filter drier
Always have some liquid present in the bulb and diaphragm
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
The system has been overcharged+The system has air trapped in the condenser

44. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Bad compressor valve
Run with high head and high suction pressure
An overcharged system

45. 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...
The internal overload is opened
A blown fuse
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
High suction pressure and low superheat

46. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...
An undercharged system+insufficient airflow over the evaporator coil
Low discharge pressure - high suction pressure - and low amp draw
It would cause the low-side pressure to decrease
Current in the compressor circuit

47. Insufficient airflow can be caused by...
Bad compressor valve
An increase of air leakage from ductwork
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

48. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90
3 psig
Low voltage and a faulty start relay
A start capacitor and a solid-state relay
110-120

49. What is the common cause of a compressor burnout...
A vacuum test+oil traces around fittings+soap bubble solution
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
A start relay
20 to 30

50. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
The superheat increases and the subcooling decreases
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
A low refrigerant charge

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NATE Air Conditioning Troubleshooting

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