Type III 2018


1. A hydrostatic tube test kit is used to ___________.




2. The _____________ is a common leak spot in systems with open-drive-type compressors.





3. Excessive operation of a purge system means _______________.





4. ASHRAE Guideline 3 states the chiller should be checked for leaks if during a standard vacuum test the pressure in a system rises from 1 mm Hg to a level above ___________.





5. The maximum test pressure for leak testing a low-pressure centrifugal chiller is _________________.





6. To raise the pressure of a low-pressure refrigeration system for leak checking, you can ________.





7. What should be done to reduce refrigerant loss from a purge unit on a R-123 chiller?





8. To check for leaks in the water box (with water removed), place the probe __________.





9. Leak testing a low-pressure refrigeration system at pressures above 10 psig could damage the __________.





10. Moisture can enter a low-pressure chiller from _______________.





11. If a chiller is suspected of having evaporator tube leaks, what should be done before recovering refrigerant?





12. Excessive moisture collection in the purge unit indicates ____________.





13. After January 1, 2019, a leaking comfort cooling system with a charge of 60 pounds must be repaired if the leak rate exceeds________ of the charge per year.





14. The best method to determine a chiller's normal charge for leak rate calculations is to __________.





15. A company has a chiller that uses 60% of the chiller cooling capacity for cooling an industrial process and 40% to cool the office spaces in the factory. Which leak rate category is this chiller in?





16. When must the leak rate be calculated?





17. For a commercial refrigeration system with a charge of 50 pounds or more of refrigerant, a substantial (or threshold) leak rate will be reduced to ________________after January 1, 2019.





18. For an industrial process refrigeration system with a charge of 50 pounds or more of refrigerant, a substantial (or threshold) leak rate will be reduced to ________________after January 1, 2019.





19. For a comfort cooling system with a charge of 50 pounds or more of refrigerant, a substantial (or threshold) leak rate will be reduced to ________________after January 1, 2019.





20. An industrial process refrigerant system containing 600 pounds has a substantial leak that is leaking at a rate above the leak rate thresholUnless granted additional time, what must be completed within 30 days?





21. The owners and operators of any system that has 50 or more pounds of refrigerant charge must keep records of refrigerant added, leak inspections, initial verification tests, and follow-up verification tests for at least _______.





22. ___________________________________ is responsible for keeping records of all leak inspections and any completed leak repair verification tests.





23. After January 1, 2019, a leaking industrial process refrigeration system with a charge of 70 pounds must be repaired if the leak rate exceeds________ of the charge per year.





24. The EPA's mandatory leak repair requirements apply to systems with a charge of ______ pounds or greater.





25. If the threshold leak rate has been exceeded, the owner must ____________.





26. If an appliance with a significant leak system is to be mothballed, the system must be _________.





27. If an owner of a system (with 101 pounds of refrigerant charge that has a significant leak) is going to retire the system, and the replacement appliance uses refrigerant that is exempt from the venting prohibition, how much time does the owner have to retire the system?





28. What is a valid reason to request an extension from the EPA on the appliance leak repair deadline?





29. After a leaking system that has been repaired has passed the initial verification leak test, when must the follow-up verification test be conducted?





30. The EPA definition for the type of cooling that chillers usually provide is ___________.





31. When recharging a chiller, refrigerant is first added as a vapor followed by liquid refrigerant to avoid ________________.





32. When charging a low-pressure chiller with R-245ca, first introduce the refrigerant as a vapor until the pressure is greater than 18 inches Hg vacuum to prevent __________________.





33. When charging a low-pressure chiller, first introduce the refrigerant as a vapor until__________.





34. The lowest access point on a low-pressure centrifugal is the _____________.





35. To prevent freezing, when recharging an evacuated water-cooled chiller system with R-123, first charge with vapor to a pressure of at least _______________.





36. After reaching the required recovery vacuum, ___________.





37. Replacement of ______________________ is always considered "major" under EPA's regulations?





38. When does the EPA allow you to NOT evacuated to the prescribed level?





39. Every recovery and recycling unit must be _____________.





40. How can you pressurize a low-pressure chiller to make a non-major repair?





41. When disposing a system with a normal charge of more than 5 pounds and less than 50 pounds, the disposal record must be kept by the technician for _________.





42. Low-pressure systems must be evacuated to ______________ before being discarded.





43. Replacing _____________________ is ALWAYS considered a "major maintenance, service, or repair?"





44. When working with low-pressure systems, the high-pressure cut off should be set to no more than _____ to avoid damaging the system or activating the pressure blow off device (rupture disk).





45. A water-cooled recovery unit typically has a _________________.





46. Water must be circulated through a chiller during refrigerant evacuation to avoid _________.





47. For a low-pressure chiller, it is best to begin refrigerant recovery with ___________ removal to avoid freezing of the water in the chiller barrels.





48. After recovering the liquid refrigerant from a low-pressure chiller, you must __________.





49. According to the EPA, when all the R-123 liquid has been removed from an average 350-ton R-123 chiller and the system vapor pressure is 0 psig, the system contains ________________.





50. The use of a severely oversized vacuum pump can cause ___________________.





51. When possible, the oil in the chiller should be heated because ______________.





52. The rupture discs on the low-pressure chiller and on the recovery tank should relieve at ________ to prevent damage to the system during refrigerant transfer into or out of the system.





53. During vapor recovery from a low-pressure chiller, ________________.





54. If possible, the temperature of the equipment room where the chiller is located ______.





55. A purge unit is used to ____________________.





56. According to the EPA, you should take an oil sample if ________________.





57. When evacuating a system and the freezing of moisture in the system is preventing you from achieving a deep vacuum, it may be necessary to prevent freezing by __________.





58. What can you do to prevent air from entering an evacuated system?





59. ________________ indicates air in a low-pressure system.





60. The refrigerant that is drawn off by the purge unit is separated from the non-condensable vapors, and returned to the system at the ____________.





61. A purge unit is connected to the _________________.





62. A "high efficiency purge unit" is a___________.





63. On a centrifugal chiller, the rupture disk is located ____________________.





64. The best place to add refrigerant to a centrifugal chiller is at the _____________.





65. R-123 at a pressure of 13 inches Hg vacuum has a saturation temperature of _____.





66. Purge units are required on low-pressure chillers because _______________.





67. The saturation pressure corresponding to 32 °F for R-123 is ________________.





68. At 23.8 in Hg, R-123 boils at approximately:





69. ASHRAE Standard 15 requires the use of room sensors and alarms to detect ________________.





70. Which of the following statements about R-1233zd is TRUE?





71. ASHRAE Standard 15 requires the use of room sensors and alarms to detect ____.





72. ASHRAE Standard 15 calls for the activation of an alarm and mechanical ventilation when the ______.





73. Which safety precautions should be adhered to for low-pressure systems?





74. What is the Safety classification of R-123?





75. Pressure relief valves must NEVER be installed _________.





76. The EPA suggests using _____________ to remove ice from a sight glass.





77. The discharge from a rupture disc should be plumbed __________ for venting?





78. The typical design burst pressure for a rupture disk on a low-pressure centrifugal air-conditioning system is ______________ .




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