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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. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
It is used to control refrigerant pressure in the compressor crankcase
The discharge pressure increases and the amperage increases
A missing air filter+improper rotation of the indoor blower+blower too small

2. What are two common symptoms of a rooftop air conditioning system that operates with a reverse-acting high-pressure control stuck in the closed position...
('Y' and 'C') and ('G' and 'C')
A start capacitor and a solid-state relay
Condenser fans operating during a low ambient condition and a low suction pressure
An uninsulated suction line and a restricted metering device

3. What three things can prevent an air conditioning system from absorbing heat at the proper rate...
Technician B
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
Bad compressor valve

4. When using a vapor-charged TXV bulb - it is necessary to have...
Short cycling and insufficient dehumidification
An acid-core suction line drier
The sensing bulb at a lower temperature than the valve body
Lack of airflow

5. 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 keeps a constant superheat in the evaporator
An uninsulated TXV sensing bulb
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
A blown fuse

6. Superheat is found in an air conditioning system in the...
110-120
Technician A is correct
Evaporator and compressor
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

7. 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...
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Rise more than normal
High superheat and low discharge pressure
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device

8. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
A plugged filter drier
Increases starting torque
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Bad compressor valve

9. If a TXV sensing bulb had lost its charge - what effect would this have on the air conditioning system...
A vacuum test+oil traces around fittings+soap bubble solution
A missing air filter+improper rotation of the indoor blower+blower too small
Technician B
It would cause the low-side pressure to decrease

10. What are two common symptoms of refrigerant leaks in an air conditioning system...
Partially frosted evaporator and high superheat
High superheat and low discharge pressure
Technician B
A start capacitor and a solid-state relay

11. A restricted air filter in an air conditioning system can be identified by...
An overcharged system
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
A missing air filter+improper rotation of the indoor blower+blower too small
Low superheat

12. After a compressor motor has been severely burnt - What accessory must be added as an aid to rid the air conditioning system of acid...
Broken rings+broken valves+seized bearings
Short cycling and insufficient dehumidification
An acid-core suction line drier
Technician B

13. What component is most often the cause of a start capacitor failure...
('Y' and 'C') and ('G' and 'C')
Technician B
The sight glass is full of liquid+the sight glass is full of gas
A start relay

14. 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
Broken rings+broken valves+seized bearings
Technician B
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
An overcharged system

15. What problem can cause an increase of discharge pressure and an increase of suction pressure...
High suction pressure and low superheat
Technician B
High superheat and low discharge pressure
An overcharged system

16. 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
A bad thermostat
Low superheat
The external equalizer could be plugged
The system could be undercharged+The compressor could have bad valves+The system could have a restricted metering device

17. Superheat is found in an air conditioning system in the...
An increase in suction pressure and an increase in discharge pressure
Evaporator and compressor
It is used to control refrigerant pressure in the compressor crankcase
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system

18. What are two common problems that can cause a sight glass in an air conditioning to have bubbles...
Low voltage and a faulty start relay
An undercharge and low ambient conditions
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Technician A is correct

19. 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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20. 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
The internal overload is opened
Increases starting torque
The low-side pressure will decrease and the evaporator coil will be partially frosted

21. What are the symptoms of an air conditioning system that has a low charge...
An increase in suction pressure and an increase in discharge pressure
Low voltage and a faulty start relay
The low-side pressure will decrease and the evaporator coil will be partially frosted
('Y' and 'C') and ('G' and 'C')

22. What are the symptoms of a TXV air conditioning system if it has lost its charge...
The sensing bulb at a lower temperature than the valve body
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
Run with high head and high suction pressure
The superheat will increase and the low-side pressure will decrease

23. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...
Run with high head and high suction pressure
Technician B
An increase in suction pressure and an increase in discharge pressure
An overcharged system

24. 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
It would cause the low-side pressure to decrease
A dirty condenser - recirculation of condenser air - and a defective condenser fan
A vacuum test+oil traces around fittings+soap bubble solution

25. 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 relay
Evaporator and compressor
Contains a solenoid coil and one or more sets of contacts
Technician B

26. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.
Condenser fans operating during a low ambient condition and a low suction pressure
The discharge pressure increases and the amperage increases
Bad compressor valve
A restricted metering device

27. 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...
Low voltage and a faulty start relay
A dirty condenser - recirculation of condenser air - and a defective condenser fan
Technician A is correct
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system

28. What are two common symptoms of refrigerant leaks in an air conditioning system...
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
Technician A
Current in the compressor circuit
Partially frosted evaporator and high superheat

29. 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
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
A bad thermostat
Technician B
Rise more than normal

30. A restricted air filter in an air conditioning system can be identified by...
An open internal overload protector
Low superheat
An uninsulated suction line and a restricted metering device
Bad compressor valve

31. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...
A dirty condenser - recirculation of condenser air - and a defective condenser fan
The external equalizer could be plugged
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
An increase in suction pressure and an increase in discharge pressure

32. Air filters should be replaced...
It increases pressure in a high-temperature evaporator coil when it is used on a dual-evaporator system
An increase in low-side pressure
An increase in low-side pressure
Whenever necessary

33. 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 discharge pressure increases and the amperage increases
An acid-core suction line drier
Technician B
An overcharged system

34. 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
Evaporator and compressor
Both technicians are correct
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
Rise more than normal

35. A rooftop package system keeps tripping out on the high-pressure switch. What are three possible causes for this problem...
Short cycling and insufficient dehumidification
A blown fuse
Dirty condenser - bent condenser fins - and air recirculating over the condenser
An increase of air leakage from ductwork

36. A customer calls with an insufficient cooling complaint on a 90
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
Technician B
An uninsulated suction line and a restricted metering device
Evaporator and compressor

37. 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
3 psig
Technician A is correct
Both technicians are incorrect

38. A compressor having tight bearings would cause the current value to...
Rise more than normal
Technician A
Technician B
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil

39. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
An increase in suction pressure and an increase in discharge pressure
High suction pressure and low superheat
The oil pump pressure and the crankcase pressure
An open internal overload protector

40. 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
A blown fuse
The oil pump pressure and the crankcase pressure
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
Technician A

41. 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
Flooding the condenser - cycling condenser fans - and dampering condenser air
Contains a solenoid coil and one or more sets of contacts
The sight glass is full of liquid+the sight glass is full of gas

42. 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
Both technicians are correct
Both technicians are incorrect
Technician B
Both technicians are incorrect

43. What is the purpose of a CPR valve...
It is used to control refrigerant pressure in the compressor crankcase
Bad compressor valve
Both technicians are correct
An uninsulated suction line and a restricted metering device

44. The temperature range of the suction line from an air conditioning system should be...
A blown fuse
The superheat will increase and the low-side pressure will decrease
Both technicians are incorrect
50-65

45. 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
The low-side pressure will decrease and the evaporator coil will be partially frosted
Both technicians are incorrect
A plugged filter drier
A low refrigerant charge

46. Which of the following will cause excessive discharge pressures on an air conditioning system...
Low superheat
A missing air filter+improper rotation of the indoor blower+blower too small
Increases starting torque
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system

47. A customer calls with an insufficient cooling complaint on a 90
Technician B
An increase in low-side pressure
An increase in low-side pressure
The low-side pressure will decrease and the evaporator coil will be partially frosted

48. 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...
110-120
An overcharged system
Low voltage and a faulty start relay
Both technicians are correct

49. What are common methods that are used for leak-testing a system...
An undercharge and low ambient conditions
Broken rings+broken valves+seized bearings
A vacuum test+oil traces around fittings+soap bubble solution
An increase in low-side pressure

50. Which of the following is a possible cause for a compressor to overheat...
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
A restricted metering device
An overcharged system
A low refrigerant charge

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NATE Air Conditioning Troubleshooting

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