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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 customer calls and complains that his air conditioning system is not operating properly. It is noticed that the compressor is not operating. A check on the run capacitor shows that there is 33 uf and the rating on the capacitor is 40 uf. Technician
The superheat will increase and the low-side pressure will decrease
The internal overload is opened
Technician B
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

2. The internal overload of an air conditioning compressor senses winding temperature and...
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Both technicians are correct
Current in the compressor circuit
('Y' and 'C') and ('G' and 'C')

3. What problem or problems can cause low discharge and suction pressure...
An undercharged system+insufficient airflow over the evaporator coil
A restricted metering device
An increase in suction pressure and an increase in discharge pressure
Technician B

4. A hard-start kit for an air conditioning system...
Technician B
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Increases starting torque
Dirty condenser - bent condenser fins - and air recirculating over the condenser

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
The internal overload is opened
Both technicians are incorrect
110-120
A restricted metering device

6. What are the operating pressures of an oil pressure safety switch...
The internal overload is opened
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Technician B
The oil pump pressure and the crankcase pressure

7. Which of the following problems can cause a decrease in a system's pressures and possible icing of the evaporator coil...
Technician B
A missing air filter+improper rotation of the indoor blower+blower too small
'G' to 'C'
The internal overload is opened

8. A hard-start kit consists of...
A start capacitor and a solid-state relay
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
50-65

9. 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
An increase in suction pressure and an increase in discharge pressure
Both technicians are incorrect
High superheat and low discharge pressure
Technician B

10. 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
Increases starting torque
Condenser fans operating during a low ambient condition and a low suction pressure
A bad thermostat
Technician B

11. 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
Technician A
Lack of airflow
Condenser fans operating during a low ambient condition and a low suction pressure
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

12. 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...
A restricted metering device
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Bad compressor valve
A blown fuse

13. Which of the following can cause excessive subcooling...
Whenever necessary
An overcharged system
A vacuum test+oil traces around fittings+soap bubble solution
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

14. 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
High suction pressure and low superheat
An increase in low-side pressure
A defective circuit breaker
Technician B

15. A commercial customer calls on a 90
A start capacitor and a solid-state relay
It is used to control refrigerant pressure in the compressor crankcase
The system has been overcharged+The system has air trapped in the condenser
Condenser fans operating during a low ambient condition and a low suction pressure

16. What component is most often the cause of a start capacitor failure...
A blown fuse
Flooding the condenser - cycling condenser fans - and dampering condenser air
A start relay
A dirty condenser - recirculation of condenser air - and a defective condenser fan

17. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.
The superheat will increase and the low-side pressure will decrease
The discharge pressure increases and the amperage increases
A blown fuse
A low refrigerant charge

18. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
A plugged filter drier
Low voltage and a faulty start relay
The oil pump pressure and the crankcase pressure
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

19. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...
High superheat and low discharge pressure
It would cause the low-side pressure to decrease
The oil pump pressure and the crankcase pressure
A defective circuit breaker

20. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
A low refrigerant charge
An open internal overload protector
'G' to 'C'

21. What are two problems that can cause an air conditioning system to have an excessively high superheat...
Technician B
Technician B
Flooding the condenser - cycling condenser fans - and dampering condenser air
An uninsulated suction line and a restricted metering device

22. The temperature range of the suction line from an air conditioning system should be...
Technician B
Contains a solenoid coil and one or more sets of contacts
The superheat will increase and the low-side pressure will decrease
50-65

23. The best description of a relay would be...
Contains a solenoid coil and one or more sets of contacts
Both technicians are incorrect
Run with high head and high suction pressure
An increase of air leakage from ductwork

24. A system that uses a thermal electric expansion valve...
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
A low refrigerant charge
50-65
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system

25. 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
Technician B
Both technicians are incorrect
Condenser fans operating during a low ambient condition and a low suction pressure
A defective circuit breaker

26. 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 increase of air leakage from ductwork
Both technicians are correct
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
Low voltage and a faulty start relay

27. Which of the following is a possible cause for a compressor to overheat...
A low refrigerant charge
20 to 30
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

28. 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
A low refrigerant charge
Whenever necessary
Broken rings+broken valves+seized bearings
Partially frosted evaporator and high superheat

29. 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
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
A blown fuse
Technician B
'G' to 'C'

30. 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
The superheat increases and the subcooling decreases
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Both technicians are correct
A low refrigerant charge

31. 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...
High superheat and low discharge pressure
Technician B
Low voltage and a faulty start relay
Technician B

32. Insufficient airflow can be caused by...
An increase of air leakage from ductwork
A sensing bulb improperly connected to the suction line
An increase in suction pressure and an increase in discharge pressure
Technician B

33. 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...
Contains a solenoid coil and one or more sets of contacts
The oil pump pressure and the crankcase pressure
High superheat and low discharge pressure
Condenser fans operating during a low ambient condition and a low suction pressure

34. What are two common symptoms of refrigerant leaks in an air conditioning system...
Partially frosted evaporator and high superheat
Bad compressor valve
Short cycling and insufficient dehumidification
Both technicians are correct

35. 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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36. A system that uses a thermal electric expansion valve...
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
Contains a solenoid coil and one or more sets of contacts
A defective circuit breaker

37. What are common methods that are used for leak-testing a system...
Clean the condenser coil
An acid-core suction line drier
It is used to control refrigerant pressure in the compressor crankcase
A vacuum test+oil traces around fittings+soap bubble solution

38. Why is it unsafe to operate an air conditioning system with a low charge...
An overcharged system
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
It would cause the low-side pressure to decrease

39. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...
The superheat increases and the subcooling decreases
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
The superheat increases and the subcooling decreases
Technician B

40. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
Low voltage and a faulty start relay
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
3 psig
A sensing bulb improperly connected to the suction line

41. 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
Technician B
An open internal overload protector
An increase of air leakage from ductwork
The low-side pressure will decrease and the evaporator coil will be partially frosted

42. 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
Technician B
Both technicians are correct
Contains a solenoid coil and one or more sets of contacts
Bad compressor valve

43. Which of the following could be the cause for a system's discharge and suction pressure being low...
The oil pump pressure and the crankcase pressure
A restricted metering device
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Lack of airflow

44. 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 start capacitor and a solid-state relay
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
It is used to control refrigerant pressure in the compressor crankcase
Technician B

45. When using a vapor-charged TXV bulb - it is necessary to have...
The external equalizer could be plugged
Flooding the condenser - cycling condenser fans - and dampering condenser air
The sensing bulb at a lower temperature than the valve body
('Y' and 'C') and ('G' and 'C')

46. Why is it unsafe to operate an air conditioning system with a low charge...
The sight glass is full of liquid+the sight glass is full of gas
The discharge pressure increases and the amperage increases
Technician B
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

47. What is the purpose of an EPR valve...
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
An acid-core suction line drier
A defective circuit breaker

48. 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
Broken rings+broken valves+seized bearings
Technician B
A low refrigerant charge
Both technicians are incorrect

49. 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
20 to 30
An undercharged system+insufficient airflow over the evaporator coil
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor

50. What problem can cause an increase of discharge pressure and an increase of suction pressure...
The low-side pressure will decrease and the evaporator coil will be partially frosted
Technician B
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
An overcharged system

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NATE Air Conditioning Troubleshooting

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