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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 are two common symptoms of refrigerant leaks in an air conditioning system...
Low superheat
Partially frosted evaporator and high superheat
Low discharge pressure - high suction pressure - and low amp draw
A dirty condenser - recirculation of condenser air - and a defective condenser fan

2. 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
A start capacitor and a solid-state relay
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Technician B
Both technicians are incorrect

3. 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
'G' to 'C'
Both technicians are incorrect
An increase in low-side pressure
Low voltage and a faulty start relay

4. 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
The discharge pressure increases and the amperage increases
The sensing bulb at a lower temperature than the valve body
A defective circuit breaker
High superheat and low discharge pressure

5. What is the common cause of a compressor burnout...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Technician A
Technician B
Technician B

6. What are the symptoms of an air conditioning system that has a low charge...
Low discharge pressure - high suction pressure - and low amp draw
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
The low-side pressure will decrease and the evaporator coil will be partially frosted
It would cause the low-side pressure to decrease

7. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Flooding the condenser - cycling condenser fans - and dampering condenser air
Bad compressor valve
A low refrigerant charge

8. 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
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
'G' to 'C'
Contains a solenoid coil and one or more sets of contacts

9. 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
Technician B
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
The internal overload is opened
3 psig

10. 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
50-65
It is used to control refrigerant pressure in the compressor crankcase
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 correct

11. The temperature range of the suction line from an air conditioning system should be...
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
Technician B
50-65
Always have some liquid present in the bulb and diaphragm

12. What are three methods for controlling a system's high-side pressure during low ambient conditions...
Short cycling and insufficient dehumidification
Technician B
It would cause the low-side pressure to decrease
Flooding the condenser - cycling condenser fans - and dampering condenser air

13. A commercial customer calls on a 90
The system has been overcharged+The system has air trapped in the condenser
A sensing bulb improperly connected to the suction line
Technician A is correct
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

14. Which of the following problems can cause a decrease in a system's pressures and possible icing of the evaporator coil...
Both technicians are incorrect
An overcharged system
The oil pump pressure and the crankcase pressure
A missing air filter+improper rotation of the indoor blower+blower too small

15. 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 missing air filter+improper rotation of the indoor blower+blower too small
Technician A is correct
The external equalizer could be plugged
Current in the compressor circuit

16. 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
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Low voltage and a faulty start relay
Run with high head and high suction pressure

17. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...
Technician B
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Low discharge pressure - high suction pressure - and low amp draw
Evaporator and compressor

18. What is the purpose of a CPR valve...
It is used to control refrigerant pressure in the compressor crankcase
Both technicians are incorrect
A bad thermostat
High superheat and low discharge pressure

19. 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
An undercharge and low ambient conditions
The internal overload is opened
Technician A
The low-side pressure will decrease and the evaporator coil will be partially frosted

20. Superheat is found in an air conditioning system in the...
Evaporator and compressor
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
It keeps a constant superheat in the evaporator
An increase of air leakage from ductwork

21. 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
An undercharged system+insufficient airflow over the evaporator coil
The external equalizer could be plugged
A start relay
3 psig

22. What are three methods for controlling a system's high-side pressure during low ambient conditions...
An uninsulated TXV sensing bulb
An uninsulated suction line and a restricted metering device
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

23. The internal overload of an air conditioning compressor senses winding temperature and...
Current in the compressor circuit
Low superheat
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
A plugged filter drier

24. Which of the following can cause low superheat in a TXV system...
Low voltage and a faulty start relay
An uninsulated TXV sensing bulb
A start capacitor and a solid-state relay
A vacuum test+oil traces around fittings+soap bubble solution

25. 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
Condenser fans operating during a low ambient condition and a low suction pressure
The external equalizer could be plugged

26. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
The internal overload is opened
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
It is used to control refrigerant pressure in the compressor crankcase

27. A hard-start kit for an air conditioning system...
110-120
Whenever necessary
Increases starting torque
20 to 30

28. What component is most often the cause of a start capacitor failure...
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
A start relay
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
An open internal overload protector

29. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
High suction pressure and low superheat
The discharge pressure increases and the amperage increases
An overcharged system

30. What causes the automatic expansion valve to close...
Rise more than normal
Both technicians are incorrect
An increase in low-side pressure
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

31. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...
An increase of air leakage from ductwork
A dirty condenser - recirculation of condenser air - and a defective condenser fan
A restricted metering device
Dirty condenser - bent condenser fins - and air recirculating over the condenser

32. 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
The superheat increases and the subcooling decreases
An open internal overload protector
The sensing bulb at a lower temperature than the valve body
('Y' and 'C') and ('G' and 'C')

33. What type of problems can be caused by an oversized air conditioning system...
Short cycling and insufficient dehumidification
Both technicians are incorrect
A missing air filter+improper rotation of the indoor blower+blower too small
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

34. The best description of a relay would be...
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
A bad thermostat
Contains a solenoid coil and one or more sets of contacts
Flooding the condenser - cycling condenser fans - and dampering condenser air

35. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
20 to 30
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
110-120
It would cause the low-side pressure to decrease

36. Which of the following will cause excessive discharge pressures on an air conditioning system...
A restricted metering device
An undercharged system+insufficient airflow over the evaporator coil
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

37. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
Technician B
Short cycling and insufficient dehumidification
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
3 psig

38. 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 blown fuse
110-120
20 to 30
Whenever necessary

39. A liquid-charged TXV bulb will...
A start relay
The superheat increases and the subcooling decreases
Always have some liquid present in the bulb and diaphragm
Technician B

40. 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
A low refrigerant charge
'G' to 'C'
An acid-core suction line drier

41. What three things can prevent an air conditioning system from releasing heat at the proper rate...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Rise more than normal
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
An overcharged system

42. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
Condenser fans operating during a low ambient condition and a low suction pressure
Both technicians are correct
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
High superheat and low discharge pressure

43. 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
The low-side pressure will decrease and the evaporator coil will be partially frosted
Technician B
An uninsulated suction line and a restricted metering device
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system

44. Insufficient airflow can be caused by...
A blown fuse
An increase of air leakage from ductwork
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Low discharge pressure - high suction pressure - and low amp draw

45. 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
The sensing bulb at a lower temperature than the valve body
The external equalizer could be plugged
A bad thermostat
A restricted metering device

46. What is the purpose of a CPR valve...
Contains a solenoid coil and one or more sets of contacts
A blown fuse
The low-side pressure will decrease and the evaporator coil will be partially frosted
It is used to control refrigerant pressure in the compressor crankcase

47. 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
Short cycling and insufficient dehumidification
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
An undercharge and low ambient conditions
Technician B

48. 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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49. Which of the following will cause excessive discharge pressures on an air conditioning system...
High superheat and low discharge pressure
Technician B
Rise more than normal
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

50. What type of problems can be caused by an oversized air conditioning system...
Short cycling and insufficient dehumidification
Broken rings+broken valves+seized bearings
The superheat increases and the subcooling decreases
Technician B

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NATE Air Conditioning Troubleshooting

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