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Type II
This section will enable you to service or dispose of medium- to very high-pressure appliances, except in applications such as small appliances or air conditioners within motor vehicles.
- 1. Which of the following always falls under the EPA definition for "major maintenance, service, or repair?"
- 2. Recovering refrigerant from a system in the vapor phase will minimize the loss of which of the following?
- 3. After system servicing, and recharging, why is refrigerant vapor reintroduced to the chiller before refrigerant liquid?
- 4. In the event of a large release of CFC, HCFC, or HFC refrigerant in a contained area which of the following is true?
- 5. A comfort-cooling appliance containing 50 pounds or more of R-22 is found to be leaking beyond the applicable leak rate threshold. Unless granted additional time, how many days do you have to repair the leak and conduct the initial leak verification test?
- 6. What are refrigeration and air-conditioning compressor heaters used for?
- 7. What is a characteristic of a refrigerant oil that is hygroscopic?
- 8. An appliance normally containing more than 50 pounds of R-22 refrigerant was found to have a 35% annual leak rate. After the repair, how many successful verification tests are required?
- 9. Which of the following should be replaced if a system is opened for servicing?
- 10. What must a system owner do, once the threshold leak rate has been exceeded on any low-pressure system using an ozone depleting refrigerant?
- 11. When could a reciprocating compressor be damaged if energized?
- 12. Why could a recycling or recovery machine that uses a hermetic compressor overheat when drawing deep vacuums?
- 13. Recovered refrigerant may contain which of the following impurities?
- 14. After installation of a field piped split system, the unit should first be pressurized with:
- 15. Which of the following is an indicator of a leak in a high-pressure system with a capillary tube?
- 16. Your recovery/recycling machine has R-22 refrigerant in it. You now have to recover refrigerant from an R-410A unit. What must be done before recovery?
- 17. Which condition can cause excessive pressure on the high side of a self-contained (active) recovery device?
- 18. After refrigerant liquid has been recovered from the appliance, any remaining vapor is.
- 19. What gas should be used to leak check a system designed for use with R-410A that has been opened for a major system repair?
- 20. A customer has an industrial process refrigeration system that contains 1000 lbs. of R-22 that has exceeded the applicable leak rate threshold. How often is the customer required to perform a leak inspection?
- 21. When first inspecting a hermetic system known to be leaking, you should look for:
- 22. A crankcase heater is often used to prevent refrigerant from mixing with compressor oil during periods of:
- 23. Refrigerant should be recovered from the condenser outlet if the condenser is;
- 24. A new split system should be checked for leaks by;
- 25. When using a recovery unit on a system containing 100 lbs. of R-410A it must be evacuated to;
- 26. What can be done with a refrigerant trace gas and nitrogen mixture after a system leak is found?
- 27. If a leaking appliance with a regulated refrigerant is not going to be repaired, it must be;
- 28. Non-condensables will cause;
- 29. A comfort cooling system that contains 50 pounds or more of R-410A is leaking. What will be the new maximum allowable annual leak rate starting in 2019?
- 30. Refrigerants CFC-12, HCFC-22, and HFC-134a are all classified as Type _______ substances.
- 31. What must the equipment owners/operators include in recovered refrigerant records for equipment with refrigerant charges that range from 5 to 50 pounds?
- 32. When recovering refrigerant from a medium-pressure system with more than 200 lbs. of refrigerant, recover to a level of;
- 33. A high-pressure appliance containing less than 200 lbs. of an HCFC or HFC refrigerant must be evacuated (recovered) to a level of;
- 34. A high-pressure appliance containing 210 lbs. of R-407C refrigerant must be evacuated (recovered) to a level of;
- 35. Proper recovery techniques begin with the use of appropriate recovery equipment that has been certified by;
- 36. EPA regulations require that all Industrial Process Refrigeration (IPR) systems containing more than 50 pounds of refrigerant MUST be repaired when the annual leak rate exceeds;
- 37. Leaks must be repaired on industrial process and refrigeration units with a 50-pound charge or greater when the annualized leak rate reaches _____ or more.
- 38. EPA regulations state that removal of which component constitutes a "major repair"?
- 39. When an appliance containing 50 pounds or more of a regulated refrigerant leaks refrigerant at an annual rate of 125% or more, what must be included on the leak inspections records?
- 40. A refrigerant sensor which will sound an alarm and automatically start a ventilation system in occupied equipment rooms falls under ASHRAE Standard;
- 41. Unless plans are made to replace a system with a leak rate that exceeds the maximum leak rate, repairs must be made within;
- 42. Which of the following refrigerants is classified as a very high-pressure refrigerant?
- 43. When dehydrating a system, it should be evacuated to a minimum level of;
- 44. What happens to a refrigerant that is heated above the saturation temperature?
- 45. All HVAC/R systems must be protected by a;
- 46. What conditions allow for a system to be opened and repaired without recovering the refrigerant to the required vacuum level?
- 47. Heat Pumps that use R-410A should be leak checked with:
- 48. Heat Pumps that have been retrofitted from R-22 to R-407C should be leak checked with:
- 49. To change the compressor on a system containing R-410A, you must isolate the compressor then:
- 50. The method to charge a system that has a normal charge of 80 pounds is to charge with:
- 51. After installation of a field-piped R-410A split heat pump, the unit should first be:
- 52. Pressure relief valves must not be:
- 53. When charging an R-12 refrigeration system that uses a water-cooled condenser, you must first charge with vapor to a pressure of at least _______, before switching to Liquid charging.
- 54. Your recovery/recycling machine has R-22 refrigerant in it. You now have to recover refrigerant from a unit with R-410A. What must be done before your recovery unit can be used to recovery R-410A?
- 55. After reaching the required recovery vacuum on a system you must:
- 56. In a refrigeration system, the component directly following the evaporator is the:
- 57. A reciprocating compressor should not be energized when
- 58. R-410A requires a high-pressure manifold gauge and hose set. They must have a:
- 59. The refrigerant pressure inside an R-410A unit which is at room temperature (72F) and not operating is:
- 60. Every air conditioning or refrigerating system should be protected by a:
- 61. To change the compressor on a system containing 40 pounds R-500, using a recycling machine that was manufactured AFTER November 15, 1993, you must isolate the compressor then:
- 62. When inspecting a system for leaks, you should look for:
- 63. When a new system has been assembled, the first thing to do is:
- 64. R-410A is different from other ASHRAE 400 series non- azeotropic blends because:
- 65. Manifold gauge set hoses should have self-sealing connectors or hand valves to:
- 66. When using recovery or recycling equipment that was manufactured AFTER November 15, 1993: you must evacuate a system containing MORE than 200 pounds of CFC-12 to _________ before making a major repair:
- 67. With an air-cooled condenser on the roof of a building and the evaporator on the first floor, recovery should first occur:
- 68. Never use oxygen or compressed air to leak-check hardware because R-410A can:
- 69. Dry nitrogen should be used to break the first vacuum when dehydrating by the double evacuation method. However, it:
- 70. A Recovery machine that uses a hermetic compressor will overheat when drawing a deep vacuum because:
- 71. The proper charging method for blended (non-azeotropic) refrigerants (400 Series) is to use a remove the charge from the cylinder as a:
- 72. When a refrigerant trace gas becomes absolutely necessary, which of the available refrigerants should be used to identify a leak?
- 73. After refrigerant liquid has been recovered from a system, any remaining vapor is:
- 74. An oil sample should be taken when ___________________
- 75. In a refrigeration system with a TXV (or other type of throttling device), the component directly following the condenser is the:
- 76. Recovered refrigerant may contain which of the following?
- 77. The backseating of a suction shutoff valve will close the:
- 78. Which repair would ALWAYS be considered "major" under EPA's regulations?
- 79. R-410A requires certified recovery and recycling machines rated for at least:
- 80. A compressor heater is used to:
- 81. Your recovery/recycling machine has R-502 refrigerant in it. You now have to recover refrigerant from a unit with R-22. What must be done before the R-22 refrigerant can be recovered/recycled?
- 82. The fastest way to recover refrigerant from a system is to remove it in the __________ phase?
- 83. Before using a recovery unit to remove a charge, what steps should be taken?
- 84. A deep vacuum is usually measured in:
- 85. Before transferring refrigerant to an empty cylinder?
- 86. To recover liquid refrigerant, you must connect one hose to the:
- 87. A system can be evacuated to only atmospheric pressure when:
- 88. The vacuum pump used to evacuate a system should be capable of pulling a vacuum of:
- 89. While R-410A is a high-pressure refrigerant, it can be stored in the back of your service van as long as:
- 90. When under a deep vacuum, the motor winding of a hermetic refrigeration compressor:
- 91. Which statement is NOT true about recycling and recovery equipment manufactured after November 15, 1993?
- 92. When a unit is opened for servicing, the ____________should always be replaced.
- 93. When servicing an operating unit that has a receiver/storage tank, the:
- 94. Use __________ to remove ice from a sight glass.
- 95. The refrigerant pressure inside an R-12 unit which is at room temperature (72F) and not operating is:
- 96. You are going to service a newer residential split system air conditioner. You would expect to find the system charged with which refrigerant?
- 97. A routine maintenance task which must be performed on refrigerant recycling machines is to _________.
- 98. Refrigerant should be removed from the condenser outlet if the:
- 99. When evacuating a system, the use of a large vacuum pump could:
- 100. On refrigeration units that use an open compressor; the ________________ is most likely to leak if the unit is not used for several months.
- 101. The primary water source for cooling the condenser of a water-cooled recovery unit is:
- 102. When using recovery and recycling equipment manufactured BEFORE November 15, 1993, technicians must evacuate a unit that has a normal charge of 10 pounds of CFC-500 to ___________ before disposing of the system.
- 103. The evaporation temperature of R- 410A at 100 psig is about:
- 104. Non-condensables in a system cause a:
- 105. When charging an R-410A system that uses a water-cooled condenser, you must first charge with vapor to a pressure of at least _______, before switching to liquid charging.
- 106. R-410A requires recovery tanks rated for at least:
- 107. The recovery rate can be increased by:
- 108. Oil foaming usually occurs in the ________.
- 109. During the evacuation of a system that contains large amounts of moisture it may be necessary to increase pressure in the system with ________, to counteract the freezing of the moisture.
- 110. Prior to replacing the condenser coil in a high pressure system, the refrigerant was recovered and stored in a refillable cylinder. The refrigerant:
- 111. The evaporation temperature of R-134a at 0 psig is:
- 112. When servicing a 60-ton packaged rooftop unit. The easiest way to check the type of refrigerant it uses is to:
- 113. The 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.
- 114. The EPA regulations require that leaking commercial or industrial process refrigeration equipment must be repaired when the leak rate exceeds ______ of the charge per year.
- 115. You are going to service an older residential split system air conditioner. You would expect to find the system charged with which refrigerant?
- 116. For what refrigerant(s) is an equipment room refrigerant monitor required under ASHRAE Standard 15?
- 117. Heat Pumps that use R-134a should be leak checked with:
- 118. On a high-pressure system _________ is an indicator of a possible leak.
- 119. System-dependent recovery equipment CANNOT be used when:
- 120. Moisture is removed from a system by:
- 121. Which component is NOT part of the low side of the system?
- 122. Soap bubble testing is used:
- 123. Refrigerant leaves the receiver of a system as a:
- 124. The recovery of refrigerant from a system as a vapor only will minimize the loss of: