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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 220-volt 30-amp motor circuit keeps tripping the breaker after the motor is started. The starting amperage is 60 amps. When measuring the amperage of the circuit - This is drawn for a brief moment. After startup - the amperage drops to 22 amps and
A blown fuse
A defective circuit breaker
110-120
Clean the condenser coil

2. 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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3. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
Bad compressor valve
Technician A is correct
A bad thermostat
20 to 30

4. Which of the following will cause excessive discharge pressures on an air conditioning system...
An increase of air leakage from ductwork
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Both technicians are incorrect
Condenser fans operating during a low ambient condition and a low suction pressure

5. What are two common symptoms of refrigerant leaks in an air conditioning system...
The sensing bulb at a lower temperature than the valve body
Current in the compressor circuit
Partially frosted evaporator and high superheat
It would cause the low-side pressure to decrease

6. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...
Broken rings+broken valves+seized bearings
The sight glass is full of liquid+the sight glass is full of gas
A missing air filter+improper rotation of the indoor blower+blower too small
Bad compressor valve

7. What are common methods that are used for leak-testing a system...
A vacuum test+oil traces around fittings+soap bubble solution
Flooding the condenser - cycling condenser fans - and dampering condenser air
The sensing bulb at a lower temperature than the valve body
An uninsulated suction line and a restricted metering device

8. 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 restricted metering device
The external equalizer could be plugged
Low discharge pressure - high suction pressure - and low amp draw
50-65

9. The temperature range of the suction line from an air conditioning system should be...
A start relay
50-65
Partially frosted evaporator and high superheat
The sensing bulb at a lower temperature than the valve body

10. What are the symptoms of an air conditioning system that has a low charge...
The low-side pressure will decrease and the evaporator coil will be partially frosted
A low refrigerant charge
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
The superheat increases and the subcooling decreases

11. What is the purpose of the TXV...
An uninsulated suction line and a restricted metering device
An acid-core suction line drier
It keeps a constant superheat in the evaporator
The external equalizer could be plugged

12. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Low discharge pressure - high suction pressure - and low amp draw
High suction pressure and low superheat
The internal overload is opened

13. A liquid-charged TXV bulb will...
Dirty condenser - bent condenser fins - and air recirculating over the condenser
3 psig
Lack of airflow
Always have some liquid present in the bulb and diaphragm

14. 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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15. The technician observes a pressure drop of 25 degrees across an air conditioning evaporator coil at start-up. This drop would indicate...
Lack of airflow
A vacuum test+oil traces around fittings+soap bubble solution
Whenever necessary
A start capacitor and a solid-state relay

16. 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 start relay
The system was improperly serviced and it has air trapped in the condenser or the unit has been overcharged
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Both technicians are incorrect

17. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...
An increase in suction pressure and an increase in discharge pressure
An acid-core suction line drier
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser
A blown fuse

18. What causes the automatic expansion valve to close...
Broken rings+broken valves+seized bearings
The sight glass is full of liquid+the sight glass is full of gas
An overcharged system
An increase in low-side pressure

19. Which of the following is a possible cause for a compressor to overheat...
An overcharged system
A start capacitor and a solid-state relay
A start capacitor and a solid-state relay
A low refrigerant charge

20. A system that uses a thermal electric expansion valve...
A sensing bulb improperly connected to the suction line
'G' to 'C'
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Rise more than normal

21. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90
110-120
Whenever necessary
Current in the compressor circuit
A defective circuit breaker

22. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.
Dirty condenser - bent condenser fins - and air recirculating over the condenser
The discharge pressure increases and the amperage increases
The superheat will increase and the low-side pressure will decrease
Low discharge pressure - high suction pressure - and low amp draw

23. 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
The oil pump pressure and the crankcase pressure
50-65
An undercharged system+insufficient airflow over the evaporator coil
Both technicians are incorrect

24. 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
Low voltage and a faulty start relay
110-120
An increase of air leakage from ductwork
Technician B

25. What problem can cause an increase of discharge pressure and an increase of suction pressure...
A defective circuit breaker
An overcharged system
'G' to 'C'
A dirty condenser - recirculation of condenser air - and a defective condenser fan

26. What is the common cause of a compressor burnout...
High suction pressure and low superheat
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
An acid-core suction line drier
Improper system evacuation during installation+short cycling of the system+excessively dirty condenser

27. A 220-volt 30-amp motor circuit keeps tripping the breaker after the motor is started. The starting amperage is 60 amps. When measuring the amperage of the circuit - This is drawn for a brief moment. After startup - the amperage drops to 22 amps and
A defective circuit breaker
It keeps a constant superheat in the evaporator
Current in the compressor circuit
Both technicians are incorrect

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

29. 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 low refrigerant charge
A blown fuse
Technician A is correct
Technician B

30. 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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31. What controls are used on air conditioning or refrigeration systems that incorporate an automatic pump-down system...
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure
A thermostat cycles the liquid-line solenoid - and a low-pressure switch controls the compressor
An increase in suction pressure and an increase in discharge pressure
The internal overload is opened

32. 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 low refrigerant charge
Technician B
A start relay
Technician A

33. A hard-start kit for an air conditioning system...
An undercharged system+insufficient airflow over the evaporator coil
Increases starting torque
Rise more than normal
A plugged filter drier

34. Which of the following is a common cause of an excessively low superheat on a TXV system...
Increases starting torque
Can use the thermal electric expansion valve instead of a liquid-line solenoid as part of the pump-down system
Partially frosted evaporator and high superheat
A sensing bulb improperly connected to the suction line

35. What problem or problems can cause low discharge and suction pressure...
An open internal overload protector
An undercharged system+insufficient airflow over the evaporator coil
Technician A is correct
The low-side pressure will decrease and the evaporator coil will be partially frosted

36. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...
('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
A plugged filter drier
A low amp draw - a decrease in high-side pressure - and a decrease in low-side pressure

37. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...
Clean the condenser coil
High suction pressure and low superheat
An increase of air leakage from ductwork
A restricted metering device

38. 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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39. 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
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
20 to 30
Short cycling and insufficient dehumidification
An open internal overload protector

40. 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...
It is used to control refrigerant pressure in the compressor crankcase
Low voltage and a faulty start relay
A restricted metering device
It is used to control refrigerant pressure in the compressor crankcase

41. When using a vapor-charged TXV bulb - it is necessary to have...
A start relay
A dirty evaporator coil - a defective evaporator fan - and an iced-up evaporator coil
Low discharge pressure - high suction pressure - and low amp draw
The sensing bulb at a lower temperature than the valve body

42. A compressor having tight bearings would cause the current value to...
Rise more than normal
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
A low refrigerant charge
A missing air filter+improper rotation of the indoor blower+blower too small

43. What are two problems that can cause an air conditioning system to have an excessively high superheat...
Low superheat
Clean the condenser coil
The sight glass is full of liquid+the sight glass is full of gas
An uninsulated suction line and a restricted metering device

44. What are the symptoms of an air conditioning system that has a low charge...
A restricted metering device
The low-side pressure will decrease and the evaporator coil will be partially frosted
Contains a solenoid coil and one or more sets of contacts
The discharge pressure increases and the amperage increases

45. 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
('Y' and 'C') and ('G' and 'C')
Technician A is correct
Low discharge pressure - high suction pressure - and low amp draw
It is used to control refrigerant pressure in the compressor crankcase

46. When using a vapor-charged TXV bulb - it is necessary to have...
The sensing bulb at a lower temperature than the valve body
It keeps a constant superheat in the evaporator
A defective circuit breaker
Broken rings+broken valves+seized bearings

47. 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
Rise more than normal
A defective circuit breaker
Technician B
An increase of air leakage from ductwork

48. Why is it unsafe to operate an air conditioning system with a low charge...
Technician B
It can seize the compressor because of excessive heat+It can seize the compressor because of lack of lubrication
A start relay
It would cause the low-side pressure to decrease

49. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...
A dirty evaporator coil+a plugged air filter+a bad indoor blower relay
Rise more than normal
Technician B
A plugged filter drier

50. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...
Condenser air being recirculated over the condenser+air trapped in the condenser due to poor service procedures+an overcharged air conditioning system
Technician B
3 psig
Both technicians are incorrect

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NATE Air Conditioning Troubleshooting

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