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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.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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 is the purpose of a CPR valve...
A blown fuse
It is used to control refrigerant pressure in the compressor crankcase
The internal overload is opened
The low-side pressure will decrease and the evaporator coil will be partially frosted

2. 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...
It would cause the low-side pressure to decrease
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
A blown fuse
Current in the compressor circuit

3. What are three methods for controlling a system's high-side pressure during low ambient conditions...
The internal overload is opened
Flooding the condenser - cycling condenser fans - and dampering condenser air
An increase in suction pressure and an increase in discharge pressure
Partially frosted evaporator and high superheat

4. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
Partially frosted evaporator and high superheat
Both technicians are correct
High suction pressure and low superheat
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system

5. Superheat is found in an air conditioning system in the...
'G' to 'C'
The external equalizer could be plugged
Evaporator and compressor
High suction pressure and low superheat

6. What problem or problems can cause low discharge and suction pressure...
An undercharge and low ambient conditions
An uninsulated TXV sensing bulb
An undercharged system+insufficient airflow over the evaporator coil
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device

7. What are two common symptoms of refrigerant leaks in an air conditioning system...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Technician B
The oil pump pressure and the crankcase pressure
Partially frosted evaporator and high superheat

8. What is the purpose of the TXV...
A missing air filter+improper rotation of the indoor blower+blower too small
It keeps a constant superheat in the evaporator
An acid-core suction line drier
An overcharged system

9. 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
Technician B
A restricted metering device
High superheat and low discharge pressure
('Y' and 'C') and ('G' and 'C')

10. 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
Low superheat
A sensing bulb improperly connected to the suction line
Low voltage and a faulty start relay

11. Which of the following can cause low superheat in a TXV system...
An uninsulated TXV sensing bulb
The oil pump pressure and the crankcase pressure
Bad compressor valve
Both technicians are incorrect

12. 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 low refrigerant charge
Lack of airflow
Condenser fans operating during a low ambient condition and a low suction pressure
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device

13. What causes the automatic expansion valve to close...
Technician B
Both technicians are correct
An increase in low-side pressure
Condenser fans operating during a low ambient condition and a low suction pressure

14. 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
Both technicians are correct
Technician B
The external equalizer could be plugged
A plugged filter drier

15. 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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16. Which of the following problems can cause a decrease in a system's pressures and possible icing of the evaporator coil...
It is used to control refrigerant pressure in the compressor crankcase
The discharge pressure increases and the amperage increases
The sensing bulb at a lower temperature than the valve body
A missing air filter+improper rotation of the indoor blower+blower too small

17. A hard-start kit for an air conditioning system...
Evaporator and compressor
Short cycling and insufficient dehumidification
Increases starting torque
An uninsulated suction line and a restricted metering device

18. The temperature range of the suction line from an air conditioning system should be...
50-65
110-120
An undercharge and low ambient conditions
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor

19. 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
Technician A is correct
Both technicians are incorrect
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
The low-side pressure will decrease and the evaporator coil will be partially frosted

20. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...
Technician B
It would cause the low-side pressure to decrease
20 to 30
An increase in low-side pressure

21. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...
An increase in suction pressure and an increase in discharge pressure
The discharge pressure increases and the amperage increases
A dirty condenser - recirculation of condenser air - and a defective condenser fan
20 to 30

22. Which of the following is a possible cause for a compressor to overheat...
An increase of air leakage from ductwork
It is used to control refrigerant pressure in the compressor crankcase
A low refrigerant charge
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

23. A hard-start kit consists of...
A restricted metering device
An increase in low-side pressure
A start capacitor and a solid-state relay
The discharge pressure increases and the amperage increases

24. Why is it unsafe to operate an air conditioning system with a low charge...
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Evaporator and compressor
An open internal overload protector
An undercharge and low ambient conditions

25. 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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26. Which of the following can cause low superheat in a TXV system...
50-65
An uninsulated TXV sensing bulb
Technician B
The oil pump pressure and the crankcase pressure

27. 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
An acid-core suction line drier
('Y' and 'C') and ('G' and 'C')
It is used to control refrigerant pressure in the compressor crankcase

28. 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
'G' to 'C'
Technician A
An increase of air leakage from ductwork
A bad thermostat

29. What are two problems that can cause an air conditioning system to have an excessively high superheat...
Technician B
An uninsulated suction line and a restricted metering device
Clean the condenser coil
20 to 30

30. 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
Both technicians are incorrect
Whenever necessary
Increases starting torque

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...
An acid-core suction line drier
High superheat and low discharge pressure
Broken rings+broken valves+seized bearings
An undercharge and low ambient conditions

32. A system that uses a thermal electric expansion valve...
An increase in suction pressure and an increase in discharge pressure
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Partially frosted evaporator and high superheat
The discharge pressure increases and the amperage increases

33. 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
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
A defective circuit breaker
Contains a solenoid coil and one or more sets of contacts
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device

34. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
High suction pressure and low superheat
Technician B
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser

35. What are three methods for controlling a system's high-side pressure during low ambient conditions...
Both technicians are incorrect
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
Flooding the condenser - cycling condenser fans - and dampering condenser air

36. Superheat is found in an air conditioning system in the...
Bad compressor valve
Technician B
Evaporator and compressor
Contains a solenoid coil and one or more sets of contacts

37. A restricted air filter in an air conditioning system can be identified by...
It would cause the low-side pressure to decrease
Broken rings+broken valves+seized bearings
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Low superheat

38. The internal overload of an air conditioning compressor senses winding temperature and...
Current in the compressor circuit
A bad thermostat
The low-side pressure will decrease and the evaporator coil will be partially frosted
The low-side pressure will decrease and the evaporator coil will be partially frosted

39. Which of the following is a possible cause for a compressor to overheat...
It keeps a constant superheat in the evaporator
A low refrigerant charge
The discharge pressure increases and the amperage increases
110-120

40. 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...
The oil pump pressure and the crankcase pressure
Flooding the condenser - cycling condenser fans - and dampering condenser air
High superheat and low discharge pressure
Low voltage and a faulty start relay

41. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
Both technicians are correct
Increases starting torque
Clean the condenser coil
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor

42. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...
110-120
110-120
A restricted metering device
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

43. What are the operating pressures of an oil pressure safety switch...
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
A bad thermostat
A low refrigerant charge

44. 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
A plugged filter drier
A defective circuit breaker
High superheat and low discharge pressure

45. A customer calls with an insufficient cooling complaint on a 90
110-120
An increase in low-side pressure
Technician B
A low refrigerant charge

46. 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 restricted metering device
('Y' and 'C') and ('G' and 'C')
Technician B
A low refrigerant charge

47. After a compressor motor has been severely burnt - What accessory must be added as an aid to rid the air conditioning system of acid...
An acid-core suction line drier
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Both technicians are incorrect
A blown fuse

48. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
Evaporator and compressor
A sensing bulb improperly connected to the suction line
An undercharge and low ambient conditions
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

49. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
An increase in suction pressure and an increase in discharge pressure
The superheat increases and the subcooling decreases
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
An undercharge and low ambient conditions

50. What are common methods that are used for leak-testing a system...
Technician B
Technician B
A dirty condenser - recirculation of condenser air - and a defective condenser fan
A vacuum test+oil traces around fittings+soap bubble solution

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NATE Air Conditioning Troubleshooting

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