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Type III
The proper servicing and disposal of low-pressure appliances requires Type III certification, but it is important to know that this near-identical exam is different from Type II in that low-pressure systems work in a vacuum. Leak-tests and proper pressurization are an essential component of low-pressure HVAC services.
- 1. Where would you place a leak detector probe to check gas leaks into the water box with water removed?
- 2. Which of the following indicates air in a low-pressure system?
- 3. A hydrostatic tube test kit will:
- 4. When leak testing a low-pressure centrifugal chiller with nitrogen, what is the maximum test pressure?
- 5. A rupture disc on a recovery vessel for low-pressure refrigerants relieves at:
- 6. On low-pressure chillers, moisture most frequently enters the refrigerant system through:
- 7. Excessive running of a purge system on a low-pressure chiller generally indicates what condition?
- 8. Pressure relief valves can only be installed:
- 9. Where should the discharge from a rupture disc be piped for venting?
- 10. What is the primary purpose of a purge unit on a low-pressure chiller?
- 11. A company uses a chiller that diverts 55% of its cooling capacity to one of its manufacturing lines and 45% of its cooling capacity to air condition the office spaces. Which leak rate category would this chiller be in?
- 12. Starting in 2019, what is the leak rate threshold for commercial refrigeration equipment with a full charge of 50 or more pounds of an HCFC refrigerant?
- 13. Where does refrigerant go after it leaves the purge unit of a low-pressure centrifugal system?
- 14. To determine if the system is leaking more than the allowable rate, the EPA allows the use of which one of the following methods to determine the full charge?
- 15. ASHRAE Standard 15-2013 requires the use of room sensors and alarms to detect:
- 16. Why do chillers using low-pressure refrigerants require purge units?
- 17. Why should the oil be removed from a low-pressure system at 130°F?
- 18. The EPA's leak repair requirements apply to appliances with a charge size of
- 19. What is meant by the term "high efficiency purge unit?"
- 20. During evacuation with large amounts of moisture it may be necessary to increase pressure to counteract freezing with gas such as:
- 21. A typical setting for the high pressure cut-out control on a recovery unit used for evacuating the refrigerant from a low-pressure chiller is:
- 22. A chiller with a charge of 200 pounds of an ozone-depleting refrigerant has passed the initial verification leak test. When must a follow-up verification test be conducted?
- 23. Where is the rupture disc located on a centrifugal chiller?
- 24. Where is refrigerant added to a centrifugal machine?
- 25. After all the liquid has been removed from an average 350-ton, low-pressure appliance, approximately how much vapor refrigerant remains in the system?
- 26. A low-pressure chiller used for comfort cooling must be repaired if it has an annual leak rate of ____ of the total charge.
- 27. If a strong odor is detected during the recovery process,
- 28. Where is refrigerant added to a low-pressure system during the charging process?
- 29. When charging a low-pressure system, refrigerant should be introduced to the system as a vapor to raise the system's saturation temperature to a minimum of;
- 30. During evacuation of systems with large amounts of water, it may be necessary to;
- 31. Because a low-pressure system operates below atmospheric pressure (in a vacuum),
- 32. In a low-pressure chiller, air and other non-condensables collect at the;
- 33. The most efficient method of leak checking a charged low-pressure refrigeration unit is to;
- 34. The Standard for machine room safety is;
- 35. When installing more than one, pressure relief valves must be installed;
- 36. The EPA-required evacuation level for recovery or recycling equipment used on low-pressure systems is
- 37. When pressurizing a low-pressure system for leak-detection purposes, do not exceed
- 38. What type of equipment can be worked on with Type III certification?
- 39. How long would an equipment owner or operator have to retrofit or retire an appliance that has exceeded the threshold leak rate if the replacement appliance uses 50 pounds or more of an exempt refrigerant?
- 40. Which of the following best describes the refrigerant recovery process from an R-123 system?
- 41. What can be used to pressurize a chiller system before opening the system for a non-major repair?
- 42. The rupture disk on a low-pressure chiller has a burst pressure of;
- 43. Where is the purge unit located in a low-pressure system?
- 44. To repair a chiller operating with R-22, the technician;
- 45. Which of the following refrigerants has a safety classification of B-1
- 46. Which organization establishes the refrigerant safety group standard?
- 47. When leak testing a low-pressure chiller, the maximum pressure to use is;
- 48. The owner must keep records of refrigerant added to a low-pressure system during service and maintenance if the system charge is;
- 49. Under ASHRAE Standard 34, R-134a is classified as;
- 50. A typical setting for the high pressure cut-out control on a recovery unit used for evacuating the refrigerant from a low pressure chiller is:
- 51. A charged low pressure refrigeration system can be efficiently leak checked by:
- 52. The existence of air in a low pressure system, causes __________.
- 53. Which safety precaution should be adhered to for low pressure systems?
- 54. Refrigerant-11 at 14.7 PSIA will boil at about:
- 55. When there is excessive moisture collecting in the purge unit of a low pressure refrigeration system, this indicates that the __________.
- 56. ASHRAE Standard 15 - 1994 requires equipment room refrigerant sensors for what safety group classification?
- 57. When recharging a refrigeration system with R-11, what vapor pressure is necessary in the shells before charging with liquid?
- 58. After reaching the required recovery vacuum on a chiller, you should:
- 59. A hydrostatic tube test kit is used to:
- 60. When charging a chiller, refrigerant vapor is introduced into the system before charging with liquid. This is because:
- 61. When evacuating a system, the use of too large a vacuum pump can cause:
- 62. On a low-pressure chiller with an open-type compressor, the ________________ is very susceptible to leaks.
- 63. What steps may be taken to prevent air accumulation into an idle low pressure refrigeration system?
- 64. Commercial and industrial process refrigeration systems must be repaired when the leak rate exceeds ______ percent of the charge per year.
- 65. When recovering vapor from a low pressure refrigeration system the:
- 66. Where does refrigerant go after it leaves the purge unit of a low pressure centrifugal system?
- 67. The purge unit takes its suction from the:
- 68. Which of the following repairs would ALWAYS be considered "major" under EPA's regulations?
- 69. Charging refrigerant liquid into a refrigeration system when it is under a 29 inch Hg vacuum can cause the:
- 70. According to the EPA, there is approximately _______ refrigerant vapor left in an average 350 ton R- 11 chiller at 0 psig pressure once all the R-11 liquid has been removed?
- 71. An oil sample should be taken when __________________.
- 72. Both CFC-11 and HCFC-123 chillers require purge units because:
- 73. Refrigerant recovery typically starts with_______ because it is faster.
- 74. Under EPA's regulations, __________________ is used to pressurize a low-pressure chiller for the purpose of opening the system for a non-major repair?
- 75. The primary water source for a recovery unit condensing coil is ______.
- 76. Which statement is NOT true of recycling and recovery equipment manufactured after November 15, 1993?
- 77. A system does not have to be evacuated all the way to the required level when:
- 78. Which action listed below is the proper method to reduce refrigerant loss from a purge unit on a CFC-11 chiller?
- 79. Identify the pressure corresponding to 32F for R-123:
- 80. What precaution should be taken prior to recovering refrigerant from a chiller suspected of having tube leaks
- 81. Pressure relief valves must never be:
- 82. If you are going to removing oil from a low pressure system, you should heat the oil because:
- 83. After recovering the liquid refrigerant you must:
- 84. EPA regulations require that any appliances containing more than 50 pounds of refrigerant (except for commercial and industrial process refrigeration) must be repaired when the leak rate exceeds ______ of the charge per year.
- 85. If you are using a recovery machine manufactured BEFORE November 15, 1993, you must evacuate any low-pressure appliance to ________ before making a major repair:
- 86. On low pressure chillers, moisture typically enters the refrigerant system through:
- 87. Refrigerant-11 at a pressure of 17 inches Hg vacuum has a saturation temperature of:
- 88. The lowest access point on a low pressure centrifugal air-conditioning unit is the:
- 89. A rupture disc on a recovery vessel for low pressure refrigerants relieves at:
- 90. According to ASHRAE Guideline 3-1996, if the pressure in a system rises from 1 mm Hg to a level above ______ during a standing vacuum test, the system should be checked for leaks.
- 91. During chiller evacuation, water is circulated to:
- 92. When charging an R-410A water chiller, you must first charge with vapor to a pressure of at least _______, before switching to liquid charging.
- 93. If you leak test a low pressure chiller with nitrogen in excess of 10 psig you could cause the _____________ to fail.
- 94. ASHRAE Standard 15 - 1994 requires that each machinery room must activate an alarm and mechanical ventilation before refrigerant concentrations exceed:
- 95. Which repair WOULD NOT fall under the EPA definition for "MAJOR MAINTENANCE, SERVICE, OR REPAIR"?>
- 96. Refrigerant is added to a centrifugal machine through the:
- 97. What is meant by the term "high efficiency purge unit?"
- 98. The PRIMARY purpose of a purge unit on a CFC-11 chiller is to:
- 99. If you are using a recovery machine manufactured AFTER November 15, 1993, you must evacuate any low- pressure appliance to ________ before making a major repair:
- 100. If you suspect a leak in the water box of a chiller, you should place the leak detector probe ________________________, and sniff for refrigerants.
- 101. To determine how much vapor to charge into an evacuated chiller, you should charge with vapor until ____________________.
- 102. ASHRAE Standard 15 - 1994 requires the use of room sensors and alarms to detect:
- 103. The discharge from a rupture disc should be piped ____________ for venting?
- 104. A centrifugal chiller's rupture disk is connected to the chiller's
- 105. To remove ice from sight glasses or viewing glasses, use:
- 106. The maximum test pressure for leak testing a low pressure centrifugal is:
- 107. According to ASHRAE Standard 34, what is the safety classification of R-123?
- 108. Excessive running of a purge system on a low pressure chiller generally indicates that the:
- 109. The typical design burst pressure for a rupture disk on a low pressure centrifugal air-conditioning system is set at ________,
- 110. During the evacuation of a system containing large amounts of moisture, you can prevent freezing of this moisture by increasing the pressure with _______ gas,