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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 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
High superheat and low discharge pressure
Whenever necessary
An overcharged system
Clean the condenser coil

2. What problem can cause an increase of discharge pressure and an increase of suction pressure...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
An overcharged system
An undercharge and low ambient conditions
Low discharge pressure - high suction pressure - and low amp draw

3. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
Bad compressor valve
A plugged filter drier
Technician B
Technician B

4. Insufficient airflow can be caused by...
An overcharged system
Flooding the condenser - cycling condenser fans - and dampering condenser air
An increase of air leakage from ductwork
A plugged filter drier

5. 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 external equalizer could be plugged
Both technicians are incorrect
A start relay
A defective circuit breaker

6. What problem or problems can cause low discharge and suction pressure...
A plugged filter drier
An undercharged system+insufficient airflow over the evaporator coil
High suction pressure and low superheat
Technician B

7. 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...
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
The internal overload is opened
High superheat and low discharge pressure
20 to 30

8. What are three methods for controlling a system's high-side pressure during low ambient conditions...
Rise more than normal
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
The superheat will increase and the low-side pressure will decrease
Flooding the condenser - cycling condenser fans - and dampering condenser air

9. 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
High suction pressure and low superheat
Evaporator and compressor
Technician B
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser

10. 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
High suction pressure and low superheat
Both technicians are incorrect
Both technicians are correct
Clean the condenser coil

11. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
An increase of air leakage from ductwork
Technician B
High superheat and low discharge pressure
3 psig

12. 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
Both technicians are incorrect
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
Lack of airflow

13. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
A plugged filter drier
Technician B
High suction pressure and low superheat
A start relay

14. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
The external equalizer could be plugged
It is used to control refrigerant pressure in the compressor crankcase
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
A bad thermostat

15. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
Both technicians are incorrect
An undercharge and low ambient conditions
A restricted metering device
High suction pressure and low superheat

16. A commercial customer calls on a 90
An acid-core suction line drier
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
The system has been overcharged+The system has air trapped in the condenser
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system

17. Why is it unsafe to operate an air conditioning system with a low charge...
Technician B
The internal overload is opened
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Increases starting torque

18. 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
Low voltage and a faulty start relay
Technician B
The external equalizer could be plugged
A plugged filter drier

19. A liquid-charged TXV bulb will...
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
The sight glass is full of liquid+the sight glass is full of gas
Technician B

20. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
Condenser fans operating during a low ambient condition and a low suction pressure
Short cycling and insufficient dehumidification
An overcharged system
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

21. 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 relay
Technician B
Short cycling and insufficient dehumidification
A dirty condenser - recirculation of condenser air - and a defective condenser fan

22. 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
A restricted metering device
The external equalizer could be plugged
Both technicians are incorrect

23. A system that uses a thermal electric expansion valve...
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Whenever necessary
Always have some liquid present in the bulb and diaphragm
Technician B

24. What is the purpose of the TXV...
It keeps a constant superheat in the evaporator
Low discharge pressure - high suction pressure - and low amp draw
An uninsulated suction line and a restricted metering device
The sensing bulb at a lower temperature than the valve body

25. 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 uninsulated suction line and a restricted metering device
Technician B
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

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...
The sensing bulb at a lower temperature than the valve body
A start relay
Low voltage and a faulty start relay
Always have some liquid present in the bulb and diaphragm

27. What causes the automatic expansion valve to close...
The superheat increases and the subcooling decreases
An undercharged system+insufficient airflow over the evaporator coil
An increase in low-side pressure
The superheat will increase and the low-side pressure will decrease

28. 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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29. 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
An overcharged system
Both technicians are correct
An open internal overload protector
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

30. Which of the following can cause low superheat in a TXV system...
The external equalizer could be plugged
An undercharged system+insufficient airflow over the evaporator coil
An uninsulated TXV sensing bulb
It is used to control refrigerant pressure in the compressor crankcase

31. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
110-120
Low discharge pressure - high suction pressure - and low amp draw
Technician B
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device

32. 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
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Technician B
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Both technicians are incorrect

33. 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
A sensing bulb improperly connected to the suction line
The system has been overcharged+The system has air trapped in the condenser
Technician B
An acid-core suction line drier

34. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
Rise more than normal
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Partially frosted evaporator and high superheat
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

35. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
Clean the condenser coil
Lack of airflow
Run with high head and high suction pressure
A defective circuit breaker

36. 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
The superheat increases and the subcooling decreases
A start relay
Partially frosted evaporator and high superheat

37. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
Contains a solenoid coil and one or more sets of contacts
The external equalizer could be plugged
A vacuum test+oil traces around fittings+soap bubble solution
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor

38. 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
Rise more than normal
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Clean the condenser coil
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

39. 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 defective circuit breaker
A plugged filter drier
Technician B

40. The best description of a relay would be...
A defective circuit breaker
Low superheat
Contains a solenoid coil and one or more sets of contacts
Rise more than normal

41. 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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42. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
An overcharged system
A low refrigerant charge

43. A system that is operating with a clear sight glass shows...
The sight glass is full of liquid+the sight glass is full of gas
Short cycling and insufficient dehumidification
An increase in low-side pressure
Evaporator and compressor

44. When using a vapor-charged TXV bulb - it is necessary to have...
The sensing bulb at a lower temperature than the valve body
A sensing bulb improperly connected to the suction line
Partially frosted evaporator and high superheat
20 to 30

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
A bad thermostat
The sensing bulb at a lower temperature than the valve body
Rise more than normal
An overcharged system

46. After a compressor motor has been severely burnt - What accessory must be added as an aid to rid the air conditioning system of acid...
The superheat will increase and the low-side pressure will decrease
High superheat and low discharge pressure
Technician B
An acid-core suction line drier

47. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90
110-120
The oil pump pressure and the crankcase pressure
An increase of air leakage from ductwork
An undercharged system+insufficient airflow over the evaporator coil

48. What are the symptoms of an air conditioning system that has a low charge...
A start relay
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
An undercharged system+insufficient airflow over the evaporator coil
The low-side pressure will decrease and the evaporator coil will be partially frosted

49. A system that is operating with a clear sight glass shows...
It keeps a constant superheat in the evaporator
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
The sight glass is full of liquid+the sight glass is full of gas
Short cycling and insufficient dehumidification

50. What is the purpose of a CPR valve...
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
It is used to control refrigerant pressure in the compressor crankcase
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

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NATE Air Conditioning Troubleshooting

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