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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. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
A sensing bulb improperly connected to the suction line
An undercharge and low ambient conditions
Technician B
A bad thermostat

2. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
Technician B
Low superheat
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Always have some liquid present in the bulb and diaphragm

3. What are three methods for controlling a system's high-side pressure during low ambient conditions...
Broken rings+broken valves+seized bearings
It would cause the low-side pressure to decrease
Flooding the condenser - cycling condenser fans - and dampering condenser air
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

4. The best description of a relay would be...
Low superheat
Contains a solenoid coil and one or more sets of contacts
Whenever necessary
Run with high head and high suction pressure

5. 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
Both technicians are incorrect
The superheat increases and the subcooling decreases
Technician B
Flooding the condenser - cycling condenser fans - and dampering condenser air

6. 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
Run with high head and high suction pressure
It keeps a constant superheat in the evaporator
Clean the condenser coil
Evaporator and compressor

7. What is the purpose of a CPR valve...
Current in the compressor circuit
It is used to control refrigerant pressure in the compressor crankcase
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Technician B

8. 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
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Current in the compressor circuit
Increases starting torque

9. 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
Dirty condenser - bent condenser fins - and air recirculating over the condenser
The low-side pressure will decrease and the evaporator coil will be partially frosted
A start capacitor and a solid-state relay

10. A system that uses a thermal electric expansion valve...
The superheat will increase and the low-side pressure will decrease
A dirty condenser - recirculation of condenser air - and a defective condenser fan
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

11. What are two problems that can cause an air conditioning system to have an excessively high superheat...
An acid-core suction line drier
An increase of air leakage from ductwork
An uninsulated suction line and a restricted metering device
Technician B

12. 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
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Lack of airflow
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor

13. 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
The external equalizer could be plugged
A missing air filter+improper rotation of the indoor blower+blower too small
Technician B

14. What is the purpose of a CPR valve...
A low refrigerant charge
The external equalizer could be plugged
It is used to control refrigerant pressure in the compressor crankcase
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

15. A hard-start kit consists of...
Contains a solenoid coil and one or more sets of contacts
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
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system

16. What are the symptoms of an air conditioning system that has a bad compressor discharge valve...
A plugged filter drier
Whenever necessary
110-120
Low discharge pressure - high suction pressure - and low amp draw

17. 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
It is used to control refrigerant pressure in the compressor crankcase
Technician B
Technician B
Both technicians are incorrect

18. A customer calls with an insufficient cooling complaint on a 90
Both technicians are incorrect
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Always have some liquid present in the bulb and diaphragm
Technician B

19. The internal overload of an air conditioning compressor senses winding temperature and...
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
An open internal overload protector
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Current in the compressor circuit

20. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
Technician B
The low-side pressure will decrease and the evaporator coil will be partially frosted
Lack of airflow
Clean the condenser coil

21. What type of problems can be caused by an oversized air conditioning system...
Technician B
'G' to 'C'
Both technicians are incorrect
Short cycling and insufficient dehumidification

22. 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
Both technicians are correct
An increase in low-side pressure
Short cycling and insufficient dehumidification
Low voltage and a faulty start relay

23. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Lack of airflow
An uninsulated suction line and a restricted metering device
A missing air filter+improper rotation of the indoor blower+blower too small

24. When using a vapor-charged TXV bulb - it is necessary to have...
The sensing bulb at a lower temperature than the valve body
50-65
Rise more than normal
'G' to 'C'

25. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
20 to 30
A defective circuit breaker
Bad compressor valve
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor

26. A hard-start kit for an air conditioning system...
Increases starting torque
3 psig
Both technicians are incorrect
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...
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Technician B
Low voltage and a faulty start relay
A low refrigerant charge

28. 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
Bad compressor valve
Technician B
Whenever necessary

29. Insufficient airflow can be caused by...
Technician B
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Both technicians are incorrect
An increase of air leakage from ductwork

30. Technician A says that if you connect 208 volts to the primary side of a 240-volt/ 24-volt transformer - the transformer will burn out. Technician B says that if you connect 208 volts to the primary side of a 240-volt/24-volt transformer - the contro
A dirty condenser - recirculation of condenser air - and a defective condenser fan
High suction pressure and low superheat
Technician B
An increase in suction pressure and an increase in discharge pressure

31. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...
('Y' and 'C') and ('G' and 'C')
Dirty condenser - bent condenser fins - and air recirculating over the condenser
A defective circuit breaker
Technician B

32. 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
An overcharged system
20 to 30
A low refrigerant charge
A defective circuit breaker

33. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
Run with high head and high suction pressure
A blown fuse
An undercharge and low ambient conditions
('Y' and 'C') and ('G' and 'C')

34. A restricted air filter in an air conditioning system can be identified by...
Low superheat
The superheat will increase and the low-side pressure will decrease
A bad thermostat
20 to 30

35. What are two problems that can cause an air conditioning system to have an excessively high superheat...
An uninsulated suction line and a restricted metering device
50-65
Flooding the condenser - cycling condenser fans - and dampering condenser air
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser

36. What are two common symptoms of refrigerant leaks in an air conditioning system...
Rise more than normal
It would cause the low-side pressure to decrease
Partially frosted evaporator and high superheat
A missing air filter+improper rotation of the indoor blower+blower too small

37. Insufficient airflow can be caused by...
Technician A
The low-side pressure will decrease and the evaporator coil will be partially frosted
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
An increase of air leakage from ductwork

38. 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 defective circuit breaker
An undercharged system+insufficient airflow over the evaporator coil
Increases starting torque
The external equalizer could be plugged

39. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
A low refrigerant charge
Low discharge pressure - high suction pressure - and low amp draw
3 psig
It is used to control refrigerant pressure in the compressor crankcase

40. Which of the following could be the cause for a system's discharge and suction pressure being low...
The low-side pressure will decrease and the evaporator coil will be partially frosted
Low superheat
A plugged filter drier
A restricted metering device

41. 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
Condenser fans operating during a low ambient condition and a low suction pressure
A defective circuit breaker
Whenever necessary
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

42. A compressor having tight bearings would cause the current value to...
The sensing bulb at a lower temperature than the valve body
Rise more than normal
110-120
Technician B

43. A system that is operating with a clear sight glass shows...
An uninsulated suction line and a restricted metering device
The sight glass is full of liquid+the sight glass is full of gas
Both technicians are incorrect
Technician B

44. Why is it unsafe to operate an air conditioning system with a low charge...
Whenever necessary
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
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

45. The internal overload of an air conditioning compressor senses winding temperature and...
Technician A is correct
Technician B
Technician B
Current in the compressor circuit

46. Why is it unsafe to operate an air conditioning system with a low charge...
Rise more than normal
An open internal overload protector
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Both technicians are incorrect

47. 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 increase of air leakage from ductwork
A sensing bulb improperly connected to the suction line
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
Technician B

48. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
An increase of air leakage from ductwork
High suction pressure and low superheat
110-120
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

49. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
3 psig
The low-side pressure will decrease and the evaporator coil will be partially frosted
An undercharged system+insufficient airflow over the evaporator coil
The superheat will increase and the low-side pressure will decrease

50. Technician A says that if you connect 208 volts to the primary side of a 240-volt/ 24-volt transformer - the transformer will burn out. Technician B says that if you connect 208 volts to the primary side of a 240-volt/24-volt transformer - the contro
Bad compressor valve
A missing air filter+improper rotation of the indoor blower+blower too small
Technician B
The discharge pressure increases and the amperage increases

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NATE Air Conditioning Troubleshooting

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