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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 possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
('Y' and 'C') and ('G' and 'C')
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Dirty condenser - bent condenser fins - and air recirculating over the condenser

2. 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...
A missing air filter+improper rotation of the indoor blower+blower too small
Both technicians are incorrect
The low-side pressure will decrease and the evaporator coil will be partially frosted
Low voltage and a faulty start relay

3. Which of the following can cause excessive subcooling...
110-120
An open internal overload protector
An overcharged system
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

4. A hard-start kit consists of...
High superheat and low discharge pressure
Technician A
A start capacitor and a solid-state relay
An increase of air leakage from ductwork

5. Air filters should be replaced...
Whenever necessary
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay

6. 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...
The external equalizer could be plugged
The internal overload is opened
Short cycling and insufficient dehumidification
('Y' and 'C') and ('G' and 'C')

7. A hard-start kit for an air conditioning system...
Dirty condenser - bent condenser fins - and air recirculating over the condenser
Low superheat
The low-side pressure will decrease and the evaporator coil will be partially frosted
Increases starting torque

8. 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...
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
A blown fuse
An uninsulated suction line and a restricted metering device
The discharge pressure increases and the amperage increases

9. What causes the automatic expansion valve to close...
An overcharged system
An increase in low-side pressure
110-120
Low superheat

10. A system that uses a thermal electric expansion valve...
A low refrigerant charge
('Y' and 'C') and ('G' and 'C')
Rise more than normal
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system

11. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
An undercharge and low ambient conditions
High suction pressure and low superheat
Dirty condenser - bent condenser fins - and air recirculating over the condenser

12. Insufficient airflow can be caused by...
An increase of air leakage from ductwork
Dirty condenser - bent condenser fins - and air recirculating over the condenser
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

13. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...
Dirty condenser - bent condenser fins - and air recirculating over the condenser
3 psig
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
It keeps a constant superheat in the evaporator

14. What is a common temperature difference between the condensing temperature on an air-cooled condensing unit and the outdoor ambient temperature...
Contains a solenoid coil and one or more sets of contacts
A low refrigerant charge
20 to 30
Dirty condenser - bent condenser fins - and air recirculating over the condenser

15. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...
Low superheat
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
A vacuum test+oil traces around fittings+soap bubble solution

16. 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 dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Clean the condenser coil
Increases starting torque

17. A system that is operating with a clear sight glass shows...
Both technicians are incorrect
The sight glass is full of liquid+the sight glass is full of gas
It would cause the low-side pressure to decrease
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system

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
An increase in suction pressure and an increase in discharge pressure
Technician B
An undercharge and low ambient conditions
The sensing bulb at a lower temperature than the valve body

19. 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...
Always have some liquid present in the bulb and diaphragm
An increase in low-side pressure
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
High superheat and low discharge pressure

20. What problem can cause an increase of discharge pressure and an increase of suction pressure...
A blown fuse
The oil pump pressure and the crankcase pressure
An overcharged system
It is used to control refrigerant pressure in the compressor crankcase

21. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...
Technician B
A restricted metering device
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
It would cause the low-side pressure to decrease

22. 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
Technician B
A sensing bulb improperly connected to the suction line
A low refrigerant charge
Both technicians are incorrect

23. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
3 psig
An undercharged system+insufficient airflow over the evaporator coil
Lack of airflow
Low superheat

24. What are the operating pressures of an oil pressure safety switch...
The oil pump pressure and the crankcase pressure
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
An uninsulated TXV sensing bulb

25. 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
3 psig
Contains a solenoid coil and one or more sets of contacts
Technician B

26. When using a vapor-charged TXV bulb - it is necessary to have...
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
The sensing bulb at a lower temperature than the valve body
Both technicians are incorrect
Evaporator and compressor

27. Superheat is found in an air conditioning system in the...
High superheat and low discharge pressure
An overcharged system
Evaporator and compressor
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

28. What problem or problems can cause low discharge and suction pressure...
('Y' and 'C') and ('G' and 'C')
A defective circuit breaker
An undercharged system+insufficient airflow over the evaporator coil
A start relay

29. What are possible problems that can cause the discharge-line temperature on an air conditioning system to be cool to the touch...
Rise more than normal
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device
The sight glass is full of liquid+the sight glass is full of gas
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system

30. What is the purpose of an EPR valve...
110-120
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
An overcharged system

31. 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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32. Insufficient airflow can be caused by...
Technician B
Technician B
An increase of air leakage from ductwork
An undercharged system+insufficient airflow over the evaporator coil

33. What are the symptoms of an air conditioning system that has a low charge...
A bad thermostat
The external equalizer could be plugged
Evaporator and compressor
The low-side pressure will decrease and the evaporator coil will be partially frosted

34. What is the purpose of the TXV...
A blown fuse
The internal overload is opened
Low voltage and a faulty start relay
It keeps a constant superheat in the evaporator

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
('Y' and 'C') and ('G' and 'C')
It would cause the low-side pressure to decrease
An increase in low-side pressure
Technician B

36. The internal overload of an air conditioning compressor senses winding temperature and...
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
The discharge pressure increases and the amperage increases
'G' to 'C'
Current in the compressor circuit

37. Which of the following can cause low superheat in a TXV system...
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
An uninsulated suction line and a restricted metering device
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
An uninsulated TXV sensing bulb

38. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
The discharge pressure increases and the amperage increases
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Bad compressor valve
It keeps a constant superheat in the evaporator

39. Superheat is found in an air conditioning system in the...
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Evaporator and compressor
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
Technician B

40. Which of the following is a possible cause for a compressor to overheat...
Short cycling and insufficient dehumidification
A low refrigerant charge
Flooding the condenser - cycling condenser fans - and dampering condenser air
An uninsulated suction line and a restricted metering device

41. 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
Lack of airflow
20 to 30

42. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.
Contains a solenoid coil and one or more sets of contacts
An uninsulated TXV sensing bulb
The discharge pressure increases and the amperage increases
The low-side pressure will decrease and the evaporator coil will be partially frosted

43. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.
Always have some liquid present in the bulb and diaphragm
Contains a solenoid coil and one or more sets of contacts
The discharge pressure increases and the amperage increases
It is used to control refrigerant pressure in the compressor crankcase

44. What are three methods for controlling a system's high-side pressure during low ambient conditions...
Both technicians are incorrect
Flooding the condenser - cycling condenser fans - and dampering condenser air
A blown fuse
Partially frosted evaporator and high superheat

45. 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
Clean the condenser coil
A low refrigerant charge
Technician B
A restricted metering device

46. 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
Clean the condenser coil
The superheat will increase and the low-side pressure will decrease
Bad compressor valve

47. 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
Bad compressor valve
Technician B
Technician A
Dirty condenser - bent condenser fins - and air recirculating over the condenser

48. What are two problems that can cause an air conditioning system to have an excessively high superheat...
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Low discharge pressure - high suction pressure - and low amp draw
An uninsulated suction line and a restricted metering device
Contains a solenoid coil and one or more sets of contacts

49. What is the purpose of an EPR valve...
Technician B
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
A start capacitor and a solid-state relay
An acid-core suction line drier

50. 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
Current in the compressor circuit
Technician A
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Evaporator and compressor

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NATE Air Conditioning Troubleshooting

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