Type II 2018


1. Look for __________________ when trying to find a leak in a system.




2. For a belt-driven non-hermetic compressor system, the _____________________ is most likely to leak if the system has not been operated for several months.





3. What is an acceptable trace gas?





4. ___________________________ indicates low charge in a high-pressure system with a capillary tube.





5. After buttoning up a system, the next step is to ________________.





6. According to the EPA, soap bubbles are best used to _____________________.





7. After installing a new split-system AC unit, the next step is to ________________.





8. When planning on using a refrigerant leak detector, an R-407C system should be leak checked with _______________.





9. After January 1, 2019, any commercial refrigeration systems containing 50 pounds or more of refrigerant must be repaired if the leak rate exceeds _______________.





10. A supermarket rack refrigeration system containing 600 pounds of refrigerant had a significant leak and you have successfully repaired the leak and perform a successful initial leak verification test. When must the follow up leak verification test be performed?





11. After repairing a leak in a rack refrigeration system, the system fails the initial leak repair verification test. What do you do next?





12. When the 30-day repair window has expired and you have to request a time extension from the EPA, what CANNOT be used as a reason to extend the deadline?





13. What must an owner of a commercial refrigeration appliance with a charge of 2000 pounds of R-22 do when the leak rate threshold has been exceeded?





14. If an owner of a system with a charge of 50 or more pounds decides to retire the unit and replace the unit with a new unit that uses an EXEMPT refrigerant, the appliance owner has _________________ to retire the appliance.





15. If an owner of a system with a charge of 50 or more pounds decides to retire the unit and replace the unit with a new unit that uses a NON-EXEMPT refrigerant, the appliance owner has _________________ to retire the appliance.





16. Owners of a cold storage warehouse can't repair their R-22 refrigeration unit, so they are going to retire the unit without replacing the unit. How long can they operate the leaking unit before it must be retired?





17. Owners of a cold storage warehouse can't repair their R-22 refrigeration unit (normal system charge is 80 pounds), so they are going to retire the unit. The owner plans to operate the unit until it is retireHow much refrigerant can the owner add to the leaking system before it is retired?





18. What must owners/operators do if their supermarket system that contains 60 pounds of R-22 leaks more than 125% of its full charge in a calendar year?





19. An owner of a system with 55 pounds of refrigerant is required to keep records of leak inspections, and any initial leak verification and follow-up verification tests for _________.





20. To mothball a system with 60 pounds of refrigerant, you must _________.





21. After repairing a significant leak in a system with 60 pounds of refrigerant, how many successful verification tests are required?





22. After January 1, 2019, any comfort cooling systems containing 50 pounds or more of refrigerant must be repaired if the leak rate exceeds_______________.





23. ___________________ appliances are defined by the EPA as air-conditioning appliances used to provide cooling in order to control heat and/or humidity in occupied facilities.





24. __________________ appliances are defined by the EPA as refrigeration appliances used in the retail food and cold storage warehouse sectors.





25. To determine the system charge for leakage rate calculations, the EPA allows the use of calculations based on ________________________________.





26. A factory has a chiller with 200 pounds of charge that uses 65% of the chiller's cooling capacity to cool a manufacturing line and the remaining 35% of the chiller's cooling capacity is used to air condition the office space in the factory. Which leak rate category would this chiller be in?





27. You have repaired a significant leak in an industrial process refrigeration system that contains 1000 pounds of R-404How often is the owner required to perform a leak inspection to verify the system is no longer leaking?





28. You have repaired a significant leak in an industrial process refrigeration system that contains 200 pounds of R-404How often is the owner required to perform a leak inspection to verify the system is no longer leaking?





29. You must calculate the leak rate ___________________.





30. A comfort-cooling appliance containing 60 pounds of refrigerant has a significant leak (leaking beyond the applicable leak rate threshold). You have _____________ to repair the leak and perform a successful initial leak verification test.





31. EPA-approved recycling and recovery equipment must ____________.





32. You are changing out the compressor of a system containing 40 pounds of R-404A, you must _______.





33. After reaching the required recovery vacuum on a system, _______________.





34. You have to open an R-410A system with a normal charge of 250 pounds. To replace a compressor, you must evacuate the system to ______________.





35. If leaks in a system make the recovery to a required evacuation level unattainable or if reaching this level of evacuation would draw air into the recovered refrigerant, you are only required to recover down to a pressure of _______________.





36. Which repair is ALWAYS considered "major system repair" under EPA's regulations?





37. It is against EPA regulations to use system-dependent recovery unit when the ____________.





38. When beginning recovery, it is fastest to remove the refrigerant as a _______________.





39. Why do manifold gauge set hoses have self-sealing connectors or hand valves on the ends of the hoses?





40. During a TXV repair, refrigerant was recovered from the system. The refrigerant ___________.





41. Before recovering refrigerant into an empty recovery tank, you must ___________.





42. Before using a recovery unit, you should _____________.





43. Refrigerant should be removed from the condenser outlet when the ___________.





44. A system with a large liquid receiver needs a major system repair to replace a faulty TXV. When servicing the unit ___________________.





45. An HVAC company must keep records for each disposed appliance with a charge between 5 and 50 pounds for _________.





46. To recover liquid refrigerant, it is best to connect to the __________.





47. Recovering refrigerant as a vapor minimizes the removal of _______ from the system.





48. After all the liquid refrigerant has been recovered from a system, the remaining vapor ______.





49. _______________ will speed up recovery.





50. A hermetic compressor overheats if operated in a vacuum because _________.





51. You have a recovery machine certified for both R-407C and R-410A with R-410A refrigerant in it. You now have to recover refrigerant from a R-407C unit. What must be done before beginning the R-407C recovery?





52. Recovered refrigerant can contain ________________.





53. The condensing coil in a water-cooled recovery unit is usually cooled by _______.





54. Refrigerant leaves the receiver as a _______________.





55. If you back-seat a compressor discharge shutoff valve, you _________________________.





56. The indicating strip in a sight glass indicates if ___________ is present in the refrigerant by changing color.





57. Before recovering refrigerant from a compressor in a parallel compressor system, you must ___________ as well as close both the compressor inlet and outlet connections.





58. The _______________ is located downstream of the evaporator.





59. If a hermetic compressor is activated while under a deep vacuum, the __________.





60. To avoid freezing the water in a water-cooled heat exchanger of an R-134a system, the unit should be initially charged with R-134a vapor to a pressure of at least about __________.





61. When charging a system that uses a water-cooled heat exchanger, the unit should be initially charged with refrigerant vapor to a pressure that corresponds to a saturation temperature above _______.





62. Non-condensable gasses trapped in a system cause a _______________.





63. What is the evaporation temperature of R-134a at 30 psig?





64. According to the EPA, it is a good idea to take an oil sample when ____________.





65. An oversized vacuum pump can cause _____________during evacuation.





66. To charge a system that has both an air-cooled condenser and evaporator with a charge of 80 pounds, it is fastest to _____________.





67. When performing a dehydration evacuation on a system with lots of water in the system, it might be necessary to introduce _____________________ and counteract the freezing of the moisture in the system.





68. Compressor crankcase heaters are used to warm the compressor and ___________.





69. ________________ is one method of removing moisture from refrigerant in a system.





70. ____________ is a potential refrigerant for a low-pressure chiller.





71. When charging an R-410A refrigeration system with a water-cooled evaporator, to avoid freezing the water in the evaporator, operate the water pump and charge the system with vapor first until a pressure of about ____________ is achieved.





72. To determine the type of refrigerant used in a 90 ton packaged rooftop unit, ______________.





73. Always replace the ____________________ if the system is opened for servicing.





74. Always evacuate to at least ________________ to assure all moisture has been removed from the system.





75. Oil foaming usually occurs in the ___________________.





76. The _______________________ is plumbed just downstream of the condenser.





77. If an R-410A system is in a room where the temperature is 80 °F, the pressure in the system is about _______.





78. A deep vacuum used for dehydration is usually measured in __________.





79. An equipment room refrigerant detector is NOT required under ASHRAE Standard 15 to detect _________, but the ventilation system must operate continuously.





80. If the ___________________, a reciprocating compressor could be damaged if energized.





81. Whenever you are using nitrogen to flush a system or break a vacuum, always use ________.





82. Every refrigerating system must be protected by ______________________.





83. Pressure relief valves should NEVER be installed in ________.





84. The EPA recommends that ________________ should be used to remove ice from a sight glass.




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