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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 system that is operating with a clear sight glass shows...
Short cycling and insufficient dehumidification
The sight glass is full of liquid+the sight glass is full of gas
Both technicians are correct
Always have some liquid present in the bulb and diaphragm

2. What is the purpose of the TXV...
An uninsulated suction line and a restricted metering device
A dirty condenser - recirculation of condenser air - and a defective condenser fan
It keeps a constant superheat in the evaporator
An increase of air leakage from ductwork

3. What are common methods that are used for leak-testing a system...
Contains a solenoid coil and one or more sets of contacts
Technician B
A vacuum test+oil traces around fittings+soap bubble solution
A sensing bulb improperly connected to the suction line

4. An air conditioning system using a fixed-orifice metering device and with noncondensables in the system will cause...
Run with high head and high suction pressure
Technician B
Low voltage and a faulty start relay
Whenever necessary

5. 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
The internal overload is opened
The external equalizer could be plugged
An uninsulated TXV sensing bulb
A defective circuit breaker

6. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
The oil pump pressure and the crankcase pressure
Run with high head and high suction pressure
An uninsulated suction line and a restricted metering device
An undercharge and low ambient conditions

7. Technician A says that to manually pump down an air conditioning system with a two-position service valve - the liquid line must be front-seated and the high- and low-side pressure will decrease to 0 psig when the pump-down is complete. Technician B
The system has been overcharged+The system has air trapped in the condenser
Technician A is correct
Always have some liquid present in the bulb and diaphragm
A vacuum test+oil traces around fittings+soap bubble solution

8. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
A start capacitor and a solid-state relay
Both technicians are correct
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
An uninsulated TXV sensing bulb

9. What is the common cause of a compressor burnout...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
A defective circuit breaker
Technician B
A low refrigerant charge

10. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.
('Y' and 'C') and ('G' and 'C')
The discharge pressure increases and the amperage increases
It keeps a constant superheat in the evaporator
Technician B

11. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...
Evaporator and compressor
It would cause the low-side pressure to decrease
Technician A
The discharge pressure increases and the amperage increases

12. A commercial customer calls on a 90
Partially frosted evaporator and high superheat
('Y' and 'C') and ('G' and 'C')
The discharge pressure increases and the amperage increases
The system has been overcharged+The system has air trapped in the condenser

13. When using a vapor-charged TXV bulb - it is necessary to have...
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
High superheat and low discharge pressure
Clean the condenser coil

14. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
The external equalizer could be plugged
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Technician B
Run with high head and high suction pressure

15. Technician A says that to manually pump down an air conditioning system with a two-position service valve - the liquid line must be front-seated and the high- and low-side pressure will decrease to 0 psig when the pump-down is complete. Technician B
Technician A is correct
Both technicians are incorrect
An undercharge and low ambient conditions
An undercharged system+insufficient airflow over the evaporator coil

16. The internal overload of an air conditioning compressor senses winding temperature and...
Current in the compressor circuit
Flooding the condenser - cycling condenser fans - and dampering condenser air
Low voltage and a faulty start relay
Clean the condenser coil

17. 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 sensing bulb improperly connected to the suction line
A sensing bulb improperly connected to the suction line
Technician B
Low discharge pressure - high suction pressure - and low amp draw

18. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
Evaporator and compressor
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Condenser fans operating during a low ambient condition and a low suction pressure
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

19. What are the symptoms of a TXV air conditioning system if it has lost its charge...
Current in the compressor circuit
The superheat will increase and the low-side pressure will decrease
Evaporator and compressor
High superheat and low discharge pressure

20. Why is it unsafe to operate an air conditioning system with a low charge...
Both technicians are incorrect
Technician B
Technician B
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

21. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90
Dirty condenser - bent condenser fins - and air recirculating over the condenser
20 to 30
110-120
Flooding the condenser - cycling condenser fans - and dampering condenser air

22. What are the symptoms of an air conditioning system that has a bad compressor discharge valve...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
50-65
Low discharge pressure - high suction pressure - and low amp draw
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device

23. A hard-start kit for an air conditioning system...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Increases starting torque
The external equalizer could be plugged
Low voltage and a faulty start relay

24. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...
Partially frosted evaporator and high superheat
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
It would cause the low-side pressure to decrease

25. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...
Technician A
Low superheat
An overcharged system
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

26. What are the operating pressures of an oil pressure safety switch...
Partially frosted evaporator and high superheat
Technician B
The discharge pressure increases and the amperage increases
The oil pump pressure and the crankcase pressure

27. 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
('Y' and 'C') and ('G' and 'C')
It would cause the low-side pressure to decrease
A vacuum test+oil traces around fittings+soap bubble solution

28. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
An increase of air leakage from ductwork
A bad thermostat
A blown fuse
Lack of airflow

29. 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 internal overload is opened
An undercharge and low ambient conditions
An acid-core suction line drier
Technician B

30. Superheat is found in an air conditioning system in the...
Low superheat
Evaporator and compressor
Flooding the condenser - cycling condenser fans - and dampering condenser air
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

31. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
The low-side pressure will decrease and the evaporator coil will be partially frosted
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Technician B
Both technicians are incorrect

32. What is the purpose of the TXV...
An acid-core suction line drier
50-65
Technician A
It keeps a constant superheat in the evaporator

33. Which of the following problems can cause a decrease in a system's pressures and possible icing of the evaporator coil...
An increase in low-side pressure
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
A missing air filter+improper rotation of the indoor blower+blower too small
A low refrigerant charge

34. 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 start relay
Lack of airflow
Dirty condenser - bent condenser fins - and air recirculating over the condenser

35. 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 sight glass is full of liquid+the sight glass is full of gas
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Technician B
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser

36. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
A start capacitor and a solid-state relay
The oil pump pressure and the crankcase pressure
The superheat increases and the subcooling decreases
A dirty condenser - recirculation of condenser air - and a defective condenser fan

37. What problem can cause an increase of discharge pressure and an increase of suction pressure...
Technician A
An acid-core suction line drier
Technician A
An overcharged system

38. 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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39. A liquid-charged TXV bulb will...
Technician B
Bad compressor valve
An overcharged system
Always have some liquid present in the bulb and diaphragm

40. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
Bad compressor valve
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Flooding the condenser - cycling condenser fans - and dampering condenser air
The sight glass is full of liquid+the sight glass is full of gas

41. 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
Current in the compressor circuit
An increase of air leakage from ductwork
An undercharge and low ambient conditions
A bad thermostat

42. The temperature range of the suction line from an air conditioning system should be...
A start relay
An increase of air leakage from ductwork
50-65
An uninsulated TXV sensing bulb

43. What problem or problems can cause low discharge and suction pressure...
An undercharged system+insufficient airflow over the evaporator coil
Technician B
Technician B
Partially frosted evaporator and high superheat

44. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
An open internal overload protector
A bad thermostat
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
A vacuum test+oil traces around fittings+soap bubble solution

45. The best description of a relay would be...
An undercharge and low ambient conditions
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
3 psig
Contains a solenoid coil and one or more sets of contacts

46. 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
('Y' and 'C') and ('G' and 'C')
Both technicians are incorrect
Current in the compressor circuit
50-65

47. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
3 psig
It is used to control refrigerant pressure in the compressor crankcase
Always have some liquid present in the bulb and diaphragm
The superheat will increase and the low-side pressure will decrease

48. 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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49. Insufficient airflow can be caused by...
A defective circuit breaker
Rise more than normal
Whenever necessary
An increase of air leakage from ductwork

50. 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
A start relay
Technician A is correct
A restricted metering device

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NATE Air Conditioning Troubleshooting

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