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EPA 608 more questions
studying for EPA 608
47
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Not Applicable
10/03/2011

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Term
what is the strongest evidence that CFCs ae in the stratosphere?
Definition
measurement of CFCs in air samples from the stratosphere
Term
What is a hight pressure refrigerant?
Definition
R 12 is one. and 22 also I think
Term
what are some very high refrigerants
Definition
13, 23 503
Term
recovery of refrigerants is necessary for
Definition
supplies for service after bans
preventing venting
preventing ozone depletion
Term
What oils are used with HFC 134 a
Definition
ester based
polyol Ester POE with 134
Term
what oil is used with R 12
Definition
mineral oil
Term
what oils are used with ternary blends
Definition
alkybenzene that are hydroscopic
Term
removing and storing is called
Definition
recovering
Term
hermetic compressors must never be operated when
Definition
there is a dehydration vacuum in the system
Term
DOT 49 required what to be recorded (one of the things)
Definition
weight of each cylinder
Term
sealed system, operating compressor + completely estricted capillary tube then how many access valves are needed to evacuate the refrigerant?
Definition
Only one on the high side.
Term
using a self contained recovery system when needing to draw only vapor Wher do you draw the favor from
Definition
the low side
Term
what can cause excesssive pressure on the high side of a self contained recovery device
Definition
recovery tank inlet no opened *
excess air in recovery tank *
Term
Recovery equi;pment must be certified if manufactured after what date
Definition
after Nov 15 1993
Term
passive recovery devices
Definition
15 lbs or less of refrigerant
Term
when using nitrogen the nitrogen tak shoudl always be equiped with
Definition
a REGULATOR !
Term
recover or recycling equipment using hermetic compressors
can overheat when drawing a deep vacuum because
Definition
the motor relies on the flow of refrigerant throught the compressor for cooling
Term
BEFORE USING A RECOVERY UNIT TO REMOVE A CHARGE
Definition
chick service valve positions
check recovery unit oil level
evacuate recovefry unit/receiver
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
Definition
Evacuate the isolated section to 20 incheces of vacuum and hold. if the pressure does not rise remove the compressor.
Term
reciprical compressors should not be energized when
Definition
the discharge valve is closed
Term
a pressure relief device
Definition
required to be on all refrigeration systems
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
Definition
if you don't use a pressure regulagtor
Term
** The component directly following the EVAPORATOR is what ??? ***
Definition
an accumulator. if it is a bore type metering device system
Term
the component that is located in the suction line directly following the evaporator is used on what kind of equipment
Definition
accumulator
capillary tube or fixed bore metering device has an accumulator
evaporator -> -> accumulator
suction line
Term
A system that uses a thermostati expansion valve has what and where is it located
Definition
a receiver..in the liquid line following the condenser holds high pressure, low temperature liquid
Term
refrigerant cannot be recovered without isolating a paallel compressor system because
Definition
of an open equalization connection
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
Definition
15 inches of Hg vacuum
Term
recyclin/ reovery equipment manufactured after Nov 15 1993
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.
Term
Using equipment made before Nov 15, 1993 must evacuate appliance with 10 lbs to what level before disposing of appliance
Definition
4 inches of Hg vacuum
Term
before transferring R to an empty cylinder you must do what
Definition
EVACUATE the cylinder
Term
with an air colled condenser on the roof and the evaporator on the 1st floor revovery first should be
Definition
from the liquid line of the evaporator
Term
routine maintenance on recycling machines
Definition
change oil and filter
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?
Definition
through a drain valve
Term
If you're removing oil from a low pressure system what about the temp and the oil?
Definition
The temp should be 130 degrees F because less refrigerant will be in the oil at the higher temperature.
Term
In a low pressure system, when your removing vapor what should be running?
Definition
system water pumps
recovery copressor
recovery condenser should all be on
Term
R 11 R 123 system refrigerant removal starts with
Definition
liquid
Term
What is a low pressure type III appliance anyway?
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.
Term
What is a type II ?????
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.
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.
Definition
Vapor-compression refrigeration...which I think are chillers . but not at all sure
Term
Questions and EPA inspector might ask
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?
Term
Low pressure appliances R 11, R 113, R 123 must be evacuated to what leves before and afer Nove 15, 1993
Definition
before is 25 inches of HG
After is 25 mm Hg absolute which is the same as 29 " Hg I think
Term
Very high appliances w
ith less than 200 lbs
of R12, 114, 134, 401, 500, 502
Definition
must be evacuated to 0 both before and after.
Term
High pressure appliances
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.
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)
Definition
Warming the refrigerant like with hot water under controlled pressure or a hot blanket????
Term
what thing do chillers have to remove nondondensables?
Definition
purge unit that takes soction from the top of the condenser and returns to evaporator
Term
low pressure refrigerant is added
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
Term
Before charging with liquid an R-11 refrigeration
Definition
vapor pressure of 16.9 hg vacumm or a saturation temperature of 36 degrees F
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