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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. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
A start relay
An undercharge and low ambient conditions
The superheat will increase and the low-side pressure will decrease
Technician B

2. A hard-start kit consists of...
A start capacitor and a solid-state relay
An increase of air leakage from ductwork
A start relay
Both technicians are incorrect

3. 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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4. What problem can cause an increase of discharge pressure and an increase of suction pressure...
An overcharged system
50-65
Low superheat
An undercharged system+insufficient airflow over the evaporator coil

5. What three things can prevent an air conditioning system from releasing heat at the proper rate...
Low voltage and a faulty start relay
Technician B
Contains a solenoid coil and one or more sets of contacts
A dirty condenser - recirculation of condenser air - and a defective condenser fan

6. 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
110-120
A plugged filter drier
Technician B
Both technicians are correct

7. 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
A sensing bulb improperly connected to the suction line
Technician A is correct
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
Bad compressor valve

8. 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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9. What is the purpose of a CPR valve...
The system has been overcharged+The system has air trapped in the condenser
The superheat increases and the subcooling decreases
It is used to control refrigerant pressure in the compressor crankcase
An open internal overload protector

10. Air filters should be replaced...
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
The internal overload is opened
Whenever necessary

11. Which of the following is a possible cause for a compressor to overheat...
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
A low refrigerant charge
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication

12. 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
Bad compressor valve
An open internal overload protector
An acid-core suction line drier
A defective circuit breaker

13. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
An undercharged system+insufficient airflow over the evaporator coil
A low refrigerant charge
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Contains a solenoid coil and one or more sets of contacts

14. Superheat is found in an air conditioning system in the...
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
Low voltage and a faulty start relay
High superheat and low discharge pressure
Evaporator and compressor

15. 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
Rise more than normal
A restricted metering device
A sensing bulb improperly connected to the suction line

16. 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
Low voltage and a faulty start relay
Both technicians are correct
Bad compressor valve

17. 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
An increase of air leakage from ductwork
Current in the compressor circuit
Evaporator and compressor

18. 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
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Flooding the condenser - cycling condenser fans - and dampering condenser air
Low voltage and a faulty start relay
Both technicians are incorrect

19. What are common methods that are used for leak-testing a system...
Low voltage and a faulty start relay
A missing air filter+improper rotation of the indoor blower+blower too small
A vacuum test+oil traces around fittings+soap bubble solution
110-120

20. 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
Technician A
Increases starting torque
An open internal overload protector

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
An increase in suction pressure and an increase in discharge pressure
Technician B
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Clean the condenser coil

22. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
20 to 30
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Current in the compressor circuit
The superheat increases and the subcooling decreases

23. 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
Both technicians are correct
Evaporator and compressor
Technician A
Technician B

24. The internal overload of an air conditioning compressor senses winding temperature and...
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
An increase of air leakage from ductwork
A start relay
Current in the compressor circuit

25. 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 blown fuse
A bad thermostat
The internal overload is opened
Low discharge pressure - high suction pressure - and low amp draw

26. A customer calls with an insufficient cooling complaint on a 90
Technician B
Short cycling and insufficient dehumidification
An undercharged system+insufficient airflow over the evaporator coil
An open internal overload protector

27. Superheat is found in an air conditioning system in the...
Low superheat
Condenser fans operating during a low ambient condition and a low suction pressure
Evaporator and compressor
An open internal overload protector

28. What type of problems can be caused by an oversized air conditioning system...
A plugged filter drier
Technician B
50-65
Short cycling and insufficient dehumidification

29. What are two problems that can cause an air conditioning system to have an excessively high superheat...
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
An uninsulated suction line and a restricted metering device
The discharge pressure increases and the amperage increases
Technician B

30. What problem or problems can cause low discharge and suction pressure...
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
An undercharged system+insufficient airflow over the evaporator coil
A sensing bulb improperly connected to the suction line

31. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
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
Always have some liquid present in the bulb and diaphragm
The discharge pressure increases and the amperage increases

32. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
Both technicians are correct
A restricted metering device
Short cycling and insufficient dehumidification
3 psig

33. 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
Contains a solenoid coil and one or more sets of contacts
An increase of air leakage from ductwork
Technician B
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged

34. Which of the following can cause excessive subcooling...
An overcharged system
Current in the compressor circuit
An increase in low-side pressure
High suction pressure and low superheat

35. A commercial customer calls on a 90
The system has been overcharged+The system has air trapped in the condenser
It would cause the low-side pressure to decrease
A blown fuse
A start capacitor and a solid-state relay

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
'G' to 'C'
Technician B
Increases starting torque
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system

37. What problem or problems can cause low discharge and suction pressure...
An undercharged system+insufficient airflow over the evaporator coil
The low-side pressure will decrease and the evaporator coil will be partially frosted
Clean the condenser coil
Rise more than normal

38. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
An increase in suction pressure and an increase in discharge pressure
A missing air filter+improper rotation of the indoor blower+blower too small
3 psig
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

39. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...
An uninsulated TXV sensing bulb
An increase in suction pressure and an increase in discharge pressure
Technician B
Technician B

40. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
The external equalizer could be plugged
Clean the condenser coil
Bad compressor valve
Technician B

41. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...
It would cause the low-side pressure to decrease
The sight glass is full of liquid+the sight glass is full of gas
A bad thermostat
A vacuum test+oil traces around fittings+soap bubble solution

42. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
An uninsulated TXV sensing bulb
Partially frosted evaporator and high superheat
Flooding the condenser - cycling condenser fans - and dampering condenser air
High suction pressure and low superheat

43. 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
Clean the condenser coil
An increase in low-side pressure
Technician B
Broken rings+broken valves+seized bearings

44. 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 B
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
A defective circuit breaker
Technician A is correct

45. 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
Low superheat
110-120
The low-side pressure will decrease and the evaporator coil will be partially frosted

46. The best description of a relay would be...
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
An overcharged system
'G' to 'C'
Contains a solenoid coil and one or more sets of contacts

47. 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
Technician B
Flooding the condenser - cycling condenser fans - and dampering condenser air
High suction pressure and low superheat

48. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
High suction pressure and low superheat
Technician B
It would cause the low-side pressure to decrease
('Y' and 'C') and ('G' and 'C')

49. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
The external equalizer could be plugged
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
50-65
A start capacitor and a solid-state relay

50. 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
A start capacitor and a solid-state relay
The sensing bulb at a lower temperature than the valve body
The internal overload is opened
Technician B

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NATE Air Conditioning Troubleshooting

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