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NATE Air Conditioning Troubleshooting

Subjects : engineering, nate
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • 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. 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






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...






4. Which of the following will cause excessive discharge pressures on an air conditioning system...






5. What are two common symptoms of refrigerant leaks in an air conditioning system...






6. What problem or problems can cause the discharge pressure to be low and the suction pressure to be high...






7. What are common methods that are used for leak-testing a system...






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






9. The temperature range of the suction line from an air conditioning system should be...






10. What are the symptoms of an air conditioning system that has a low charge...






11. What is the purpose of the TXV...






12. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...






13. A liquid-charged TXV bulb will...






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...






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






17. What are two common symptoms of an overcharged air conditioning system that uses a capillary-tube-type metering device...






18. What causes the automatic expansion valve to close...






19. Which of the following is a possible cause for a compressor to overheat...






20. A system that uses a thermal electric expansion valve...






21. What is a common discharge temperature of an air-cooled air conditioning system that is used on a 90






22. Name two symptoms that are common to an over-charged air conditioning system and a system that has a dirty condenser.






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






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






25. What problem can cause an increase of discharge pressure and an increase of suction pressure...






26. What is the common cause of a compressor burnout...






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






28. What type of problems can be caused by an oversized air conditioning system...






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...






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...






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






33. A hard-start kit for an air conditioning system...






34. Which of the following is a common cause of an excessively low superheat on a TXV system...






35. What problem or problems can cause low discharge and suction pressure...






36. When a high-efficiency split air conditioning system has a plugged metering device - what symptoms might occur...






37. What types of symptoms will be present if the sensing bulb of a TXV is not properly connected...






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






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...






41. When using a vapor-charged TXV bulb - it is necessary to have...






42. A compressor having tight bearings would cause the current value to...






43. What are two problems that can cause an air conditioning system to have an excessively high superheat...






44. What are the symptoms of an air conditioning system that has a low charge...






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






46. When using a vapor-charged TXV bulb - it is necessary to have...






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






48. Why is it unsafe to operate an air conditioning system with a low charge...






49. An air conditioning unit has a suction line that is frosted up to the compressor. What faults could cause this to occur...






50. On an are-22 air conditioning system - the suction-line filter drier should be changed when the pressure drop dictates...







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