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28 Cards in this Set
- Front
- Back
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refrigerant that enters the compressor under normal operating conditions is a: |
low pressure vapor |
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if you are recovering refrigerant from a frost-free refrigerator you should:
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turn on the defrost heater to vaporize the trapped liquid |
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the recovery of refrigerant from a system as a vapor only will minimize the loss of:
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oil |
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the recovery rate can be increased by:
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packing the recovery vessel in ice
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to change the compressor on a system containing 40 lbs of R-500 using a recycling machine that was manufactured after Nov 15, 1993, you must isolate the compressor then:
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evacuate the isolated section to 10 in of vacuum and hold is system pressure does not rise, remove compressor |
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when using recycling or recovery equipment manufactured after Nov 15,1993 you must evacuate system containing more than 200 lbs of cfc to_____ before making a major repair: |
15 inches of vacuum |
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when using recovery or recycling equipment manufactured before Nov15,1993 technicians must evacuate a in it that has a normal charge of 10 lbs of cfc-500 to______ before disposing of the system
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4 inches of vacuum |
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when charging an R-410 system that uses a water-cooled condenser, you must first charge with vapor to a pressure of at least______ before switching yo a liquid charge
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120 psig
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when under a deep vacuum, the motor of a hermetic refrigeration compressor:
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will be damaged if energized |
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when charging an R-12 system that uses water-cooled condenser, you must first charge with vapor to a pressure of at least_____ before switching to a liquid charging:
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35 psig |
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in a refrigeration system with a TXV, the component directly following the condenser is the: |
receiver |
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a rupture disc on a recovery vessel for low pressure refrigerants relieves at: |
15 psig |
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the lowest access point on a low pressure centrifugal air-conditioning unit is the |
evaporator charging valve |
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if you are using a recovery machine manufactured after Nov 15, 1993 you must evacuate any low-pressure appliance to_________ before making a major repair: |
25mm of Hg absolute |
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if you are using a recovery machine manufactured before Nov 15, 1993 you must evacuate any low-pressure appliance to_________ before making a major repair:
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25 inches of vacuum
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R-11 at 14.7 psia will boil at at about
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74.5F |
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a centrifugal chiller's rupture disc is connected to the chiller's : |
evaporator |
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low pressure refrigerants: |
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HFC Refrigerants: |
R-410A, R134a, 407 |
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refrigerant that enters a system under normal operating conditions, is a : |
low pressure vapor |
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it is illegal to vent substitutions for CFC and HCFC refrigerants since:
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Nov,1995 |
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refrigerant that enters the expansion device is a :
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liquid |
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what standard must reclaimed refrigerant meet before it can be resold:
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ARI 700 |
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HCFC Refrigerants:
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R-402A & B |
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CFC Refrigerants:
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R-11, R-12, R-13, R-500, R-502, R-503 |
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Very high pressure refrigerants: |
R-13, R-23, R-503, |
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refrigerant leaves the condenser of an operating system as a: |
high pressure liquid |
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High pressure refrigerants:
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R-22, R-502, R-400(all)
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