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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 the symptoms of an air conditioning system that has a bad compressor discharge valve...
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
An increase of air leakage from ductwork
Low discharge pressure - high suction pressure - and low amp draw
Partially frosted evaporator and high superheat

2. 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
Technician A
Both technicians are correct
Technician B

3. The temperature range of the suction line from an air conditioning system should be...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
50-65
High suction pressure and low superheat
A plugged filter drier

4. What are two problems that can cause an air conditioning system to have an excessively high superheat...
An uninsulated suction line and a restricted metering device
The internal overload is opened
Both technicians are incorrect
Current in the compressor circuit

5. A restricted air filter in an air conditioning system can be identified by...
50-65
High suction pressure and low superheat
A blown fuse
Low superheat

6. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
Technician B
Technician B
Lack of airflow
Flooding the condenser - cycling condenser fans - and dampering condenser air

7. A customer calls with an insufficient cooling complaint on a 90
The system has been overcharged+The system has air trapped in the condenser
Broken rings+broken valves+seized bearings
Technician B
Technician A is correct

8. What is the common cause of a compressor burnout...
Both technicians are correct
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
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser

9. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...
Clean the condenser coil
A plugged filter drier
It would cause the low-side pressure to decrease
Evaporator and compressor

10. A liquid-charged TXV bulb will...
Technician A is correct
Always have some liquid present in the bulb and diaphragm
110-120
3 psig

11. 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
Low voltage and a faulty start relay
Technician B
A sensing bulb improperly connected to the suction line
Lack of airflow

12. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
3 psig
An undercharge and low ambient conditions
An open internal overload protector
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

13. 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...
An uninsulated suction line and a restricted metering device
The superheat increases and the subcooling decreases
A blown fuse
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system

14. Which of the following is a possible cause for a compressor to overheat...
Technician B
A low refrigerant charge
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
An uninsulated TXV sensing bulb

15. Which of the following will cause excessive discharge pressures on an air conditioning system...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
A start capacitor and a solid-state relay

16. 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
Technician B
An uninsulated suction line and a restricted metering device
An overcharged system
An increase of air leakage from ductwork

17. 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
Technician B
An acid-core suction line drier
A bad thermostat
'G' to 'C'

18. 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
The sight glass is full of liquid+the sight glass is full of gas
Short cycling and insufficient dehumidification
Current in the compressor circuit

19. 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
Dirty condenser - bent condenser fins - and air recirculating over the condenser
An increase in low-side pressure
Bad compressor valve
Technician B

20. 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 dirty evaporator coil+a plugged air filter+a bad indoor blower relay
The sensing bulb at a lower temperature than the valve body
An overcharged system
Technician B

21. A commercial customer calls on a 90
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Technician A
Bad compressor valve
The system has been overcharged+The system has air trapped in the condenser

22. 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
Increases starting torque
Increases starting torque

23. 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
Whenever necessary
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Both technicians are incorrect

24. 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
Partially frosted evaporator and high superheat
Low discharge pressure - high suction pressure - and low amp draw
A plugged filter drier

25. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
The low-side pressure will decrease and the evaporator coil will be partially frosted
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
High suction pressure and low superheat
Clean the condenser coil

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

27. What is the purpose of an EPR valve...
110-120
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system

28. When an air conditioning system has an undercharge - what happens to the superheat and the subcooling of the system...
The superheat increases and the subcooling decreases
An increase in suction pressure and an increase in discharge pressure
A start capacitor and a solid-state relay
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

29. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
Both technicians are incorrect
A plugged filter drier
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor

30. What problem can cause an increase of discharge pressure and an increase of suction pressure...
'G' to 'C'
Condenser fans operating during a low ambient condition and a low suction pressure
An overcharged system
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device

31. 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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32. A system that is operating with a clear sight glass shows...
A low refrigerant charge
Low superheat
It is used to control refrigerant pressure in the compressor crankcase
The sight glass is full of liquid+the sight glass is full of gas

33. What are the symptoms of an air conditioning system that has a low charge...
A vacuum test+oil traces around fittings+soap bubble solution
Rise more than normal
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
The low-side pressure will decrease and the evaporator coil will be partially frosted

34. What type of problems can be caused by an oversized air conditioning system...
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Short cycling and insufficient dehumidification
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
50-65

35. What is a possible cause of a sweat or frost pattern downstream from a sight glass and filter dryer...
An uninsulated TXV sensing bulb
A plugged filter drier
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device

36. 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
110-120
Both technicians are incorrect
Whenever necessary
Technician B

37. Which of the following could be the cause for a system's discharge and suction pressure being low...
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
A missing air filter+improper rotation of the indoor blower+blower too small
A restricted metering device
Technician B

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
An open internal overload protector
Clean the condenser coil
An overcharged system
An overcharged system

39. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
The low-side pressure will decrease and the evaporator coil will be partially frosted
A start capacitor and a solid-state relay
Bad compressor valve
50-65

40. Which of the following can cause excessive subcooling...
Low superheat
Flooding the condenser - cycling condenser fans - and dampering condenser air
Technician B
An overcharged system

41. What are common methods that are used for leak-testing a system...
Whenever necessary
A vacuum test+oil traces around fittings+soap bubble solution
Technician B
Both technicians are incorrect

42. What are two common symptoms of refrigerant leaks in an air conditioning system...
A plugged filter drier
Increases starting torque
Partially frosted evaporator and high superheat
It is used to control refrigerant pressure in the compressor crankcase

43. What are the symptoms of an air conditioning system that has a low charge...
20 to 30
A bad thermostat
110-120
The low-side pressure will decrease and the evaporator coil will be partially frosted

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
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
The discharge pressure increases and the amperage increases
Bad compressor valve
Both technicians are correct

45. A hard-start kit consists of...
Technician A is correct
A start capacitor and a solid-state relay
An open internal overload protector
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser

46. 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
Technician B
A missing air filter+improper rotation of the indoor blower+blower too small
Rise more than normal
A bad thermostat

47. 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
Both technicians are incorrect
Technician A
Lack of airflow
An overcharged system

48. 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
A plugged filter drier
A bad thermostat
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

49. Which of the following will cause excessive discharge pressures on an air conditioning system...
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
A restricted metering device
A sensing bulb improperly connected to the suction line

50. 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 increase in low-side pressure
High superheat and low discharge pressure
A dirty condenser - recirculation of condenser air - and a defective condenser fan
An acid-core suction line drier

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NATE Air Conditioning Troubleshooting

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