Term
| what is the strongest evidence that CFCs ae in the stratosphere? |
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Definition
| measurement of CFCs in air samples from the stratosphere |
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Term
| What is a hight pressure refrigerant? |
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Definition
| R 12 is one. and 22 also I think |
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Term
| what are some very high refrigerants |
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Definition
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Term
| recovery of refrigerants is necessary for |
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Definition
supplies for service after bans
preventing venting
preventing ozone depletion |
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Term
| What oils are used with HFC 134 a |
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Definition
ester based
polyol Ester POE with 134 |
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Term
| what oil is used with R 12 |
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Definition
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Term
| what oils are used with ternary blends |
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Definition
| alkybenzene that are hydroscopic |
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Term
| removing and storing is called |
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Definition
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Term
| hermetic compressors must never be operated when |
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Definition
| there is a dehydration vacuum in the system |
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Term
| DOT 49 required what to be recorded (one of the things) |
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Definition
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Term
| sealed system, operating compressor + completely estricted capillary tube then how many access valves are needed to evacuate the refrigerant? |
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Definition
| Only one on the high side. |
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Term
| using a self contained recovery system when needing to draw only vapor Wher do you draw the favor from |
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Definition
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Term
| what can cause excesssive pressure on the high side of a self contained recovery device |
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Definition
recovery tank inlet no opened *
excess air in recovery tank * |
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Term
| Recovery equi;pment must be certified if manufactured after what date |
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Definition
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Term
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Definition
| 15 lbs or less of refrigerant |
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Term
| when using nitrogen the nitrogen tak shoudl always be equiped with |
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Definition
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Term
recover or recycling equipment using hermetic compressors
can overheat when drawing a deep vacuum because |
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Definition
| the motor relies on the flow of refrigerant throught the compressor for cooling |
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Term
| BEFORE USING A RECOVERY UNIT TO REMOVE A CHARGE |
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Definition
chick service valve positions
check recovery unit oil level
evacuate recovefry unit/receiver |
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Term
| you are changing out the compressor of a system with 40 lbs or R 502. recycling equipmen was manufactured after Nov 15, 1993 In addition to isolating ther compressor what do you do |
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Definition
| Evacuate the isolated section to 20 incheces of vacuum and hold. if the pressure does not rise remove the compressor. |
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Term
| reciprical compressors should not be energized when |
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Definition
| the discharge valve is closed |
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Term
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Definition
| required to be on all refrigeration systems |
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Term
| Dry nitrogen should be used to break the first vacuum when dehydrating by the double evacuation methos like when you have a compressor burn out but it is dangerous |
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Definition
| if you don't use a pressure regulagtor |
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Term
| ** The component directly following the EVAPORATOR is what ??? *** |
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Definition
| an accumulator. if it is a bore type metering device system |
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Term
| the component that is located in the suction line directly following the evaporator is used on what kind of equipment |
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Definition
accumulator
capillary tube or fixed bore metering device has an accumulator
evaporator -> -> accumulator
suction line |
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Term
| A system that uses a thermostati expansion valve has what and where is it located |
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Definition
| a receiver..in the liquid line following the condenser holds high pressure, low temperature liquid |
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Term
| refrigerant cannot be recovered without isolating a paallel compressor system because |
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Definition
| of an open equalization connection |
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Term
recovery/ recycling equipment made after Nov 15, 1993 must evacuate thing with More than 200 pounds of
CFC 12 to what level before making major repairs |
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Definition
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Term
| recyclin/ reovery equipment manufactured after Nov 15 1993 |
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Definition
must be tested by and EPA approved third party
Must meet stronger standards than before nov 15, 1993
all have to be equiped with low loss fittings. |
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Term
| Using equipment made before Nov 15, 1993 must evacuate appliance with 10 lbs to what level before disposing of appliance |
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Definition
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Term
| before transferring R to an empty cylinder you must do what |
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Definition
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Term
| with an air colled condenser on the roof and the evaporator on the 1st floor revovery first should be |
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Definition
| from the liquid line of the evaporator |
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Term
| routine maintenance on recycling machines |
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Definition
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Term
| a water box..you removed the water and your wanting to check for gas leaks..so where do you place the leak detector probe? |
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Definition
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Term
| If you're removing oil from a low pressure system what about the temp and the oil? |
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Definition
| The temp should be 130 degrees F because less refrigerant will be in the oil at the higher temperature. |
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Term
| In a low pressure system, when your removing vapor what should be running? |
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Definition
system water pumps
recovery copressor
recovery condenser should all be on |
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Term
| R 11 R 123 system refrigerant removal starts with |
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Definition
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Term
| What is a low pressure type III appliance anyway? |
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Definition
| Low-pressure appliances (Type III) - an appliance that uses a refrigerant with a liquid phase saturation pressure below 45 psia at 104°F. This definition includes but is not limited to appliances using R-11, R-123, and R-113. |
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Term
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Definition
Medium-pressure appliances (Type II) - an appliance that uses a refrigerant with a liquid phase saturation pressure between 45 psia and 170 psia at 104°F. This definition includes but is not limited to appliances using R-114, R-124, R-12, R-401C, R-406A, and R-500.
· High-pressure appliances (Type II) - an appliance that uses a refrigerant with a liquid phase saturation pressure between 170 psia and 355 psia at 104°F. This definition includes but is not limited to appliances using R-12, R-22, R-134a, R-401A/B, R-408A, R-409A, R-410A, R-411A/B, R-416A, R-500, R-502, R-404A, and R-507.
· Very high-pressure appliances (Type II) - an appliance that uses a refrigerant with a critical temperature below 104°F or with a liquid phase saturation pressure above 355 psia at 104°F. This definition includes but is not limited to appliances using R-13, R-23, and R-503. |
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Term
| WHAT is the most widely used method for air-conditioning of large public buildings, offices, private residences, hotels, hospitals, theaters, restaurants and automobiles. It is also used in domestic and commercial refrigerators, large-scale warehouses for chilled or frozen storage of foods and meats, refrigerated trucks and railroad cars, and a host of other commercial and industrial services. Oil refineries, petrochemical and chemical processing plants, and natural gas processing plants are among the many types of industrial plants that often utilize large vapor-compression refrigeration systems. |
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Definition
| Vapor-compression refrigeration...which I think are chillers . but not at all sure |
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Term
| Questions and EPA inspector might ask |
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Definition
what are the vacuum levels for the refrigerant used in this location?
can you demonstrate the use of the recovery system
can you validate you leak checked the recovery units?
can you demonstrate how to calculate a leak rate?
what are the acceptable follow up leak check methods? |
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Term
| Low pressure appliances R 11, R 113, R 123 must be evacuated to what leves before and afer Nove 15, 1993 |
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Definition
before is 25 inches of HG
After is 25 mm Hg absolute which is the same as 29 " Hg I think |
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Term
Very high appliances w
ith less than 200 lbs
of R12, 114, 134, 401, 500, 502 |
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Definition
| must be evacuated to 0 both before and after. |
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Term
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Definition
High pressure appliances with more than 200 of $ 12, R 114, R 134a, R 401, R 500 R 502
it is 4 before and 15 after
with LESS than 200 lbsis 4 before and 10 after. |
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Term
| WHAT can be used to pressurize and R-11 or R-123 system for the purpose of opening the system for non-major repair (I think they are talking about a chiller or low pressure system) |
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Definition
| Warming the refrigerant like with hot water under controlled pressure or a hot blanket???? |
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Term
| what thing do chillers have to remove nondondensables? |
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Definition
| purge unit that takes soction from the top of the condenser and returns to evaporator |
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Term
| low pressure refrigerant is added |
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Definition
| through thel owest access point the evaporator charging valve...but your introducing liquid into a deep vacuum and it wil boil and freeze water intubes. so you have to initially charge in vapor ....Before charging with liquid an R-11 refrigeration system requires a vapor pressure of 16.9 hg vacumm or a saturation temperature of 36 degrees F |
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Term
| Before charging with liquid an R-11 refrigeration |
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Definition
| vapor pressure of 16.9 hg vacumm or a saturation temperature of 36 degrees F |
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