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EPA FlashCards > EPA 100 Flashcard Core > Flashcards

EPA 100 Flashcard Core

1
Q

What helps form the Earth’s protective shield?

A

Stratospheric Ozone

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2
Q

What measures the ability of a substance to destroy the ozone in the stratosphere?

A

Ozone Depletion Potential

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3
Q

What is a threat to the stratosphere and the whole world?

A

Ozone Depletion

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4
Q

What harms/damages does the depletion of the ozone layer bring?

A

Skin cancer, Cataracts, Reduced Crop Yields and or damage to marine life

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5
Q

What is the cause for the most chlorine pollution?

A

Chlorine containing Refrigerants / Refrigerants

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6
Q

How many oxygen atoms does each ozone molecule have?

A

3 Oxygen atoms

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7
Q

How many oxygen atoms does a chlorine atom steal from the ozone molecule?

A

One oxygen

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8
Q

How long does a single chlorine atom last?

A

120 Years

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9
Q

What are HFCs made up of?

A

Hydrogen, Fluorine, and Carbon

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10
Q

What does GWP stand for?

A

Global Warming Potential

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11
Q

How is refrigerant toxicity classified?

A

They are classified using class A (least toxic) and B ( most toxic)

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12
Q

How is refrigerant flammability classified

A

It is classified using 1 (no flammability), 2, 3, 4 (high flammability

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13
Q

What are Chlorofluorocarbons/CFCs?

A

Refrigerant with the highest ozone depletion potential

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14
Q

What are hydrochlorofluorocarbons/HCFCs?

A

Less harmful to the stratospheric compared to CFCs but still harmful nonetheless

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15
Q

What are hydrofluorocarbons/HFCs?

A

Has the lowest ozone depletion potential

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16
Q

What are hydrofluoroolefins/HFOs?

A

Have zero ozone depletion potential but still presents a small risk on global warming

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17
Q

What are hydrocarbons/HCs?

A

Pose the least amount of threat to the environment with zero ozone and low global warming potential

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18
Q

What are Azeotropic refrigerants?

A

Mixture of 2 or more refrigerants which condense and evaporate at same temperatures

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19
Q

What are Zeotropic/non-azeotropic refrigerants?

A

A blend of refrigerants which can be either two or three part whith different pressures at similar saturation temperatures

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20
Q

What is bubble point?

A

Values used when charging by condenser subcooling (liquid side)

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21
Q

What is dew point?

A

Values used when charging through suction or evaporator superheat

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22
Q

How much pressure is low pressure?

A

At least 30 PSIG or lower

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23
Q

How much pressure is medium pressure?

A

From 30 to 155 PSIG

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24
Q

How much pressure is high pressure?

A

From 155 to 340 PSIG

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25
Q

How much pressure is very high pressure?

A

Anything above 340 PSIG

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26
Q

What is the Montreal Protocol?

A

An international treaty that addresses ozone-depleting substances

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27
Q

What is the clean air act?

A

Clean Air act set regulations for refrigerant handling in the HVACR field

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28
Q

What is illegal to do with refrigerants?

A

Releasing them on purpose

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29
Q

What does the SNAP program do?

A

It identifies refrigerants with lower overall risk to the environment and people

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30
Q

Are desiccant dehumidifiers covered by the EPA Section 608?

A

No

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31
Q

Does the EPA require employees or companies to record any disposed appliances with 5-50 lbs of refrigerant?

A

No

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32
Q

Do you need to be EPA certified to buy carbon dioxide?

A

No

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33
Q

Is it illegal to top off a system using a refrigerant that isn’t the same as the one in the system?

A

Yes

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34
Q

What must be done before discarding any cylinders?

A

Any refrigerant must be taken out, rendered useless and recycled

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35
Q

Can recovered refrigerants be released?

A

Nope,never ever

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36
Q

How big of quantities can isobutane be released from household freezers? If release-able at all?

A

Small quantites only

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37
Q

The three R’s stand for?

A

Recovery, Reclaim, Recycle

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38
Q

What does Recover mean?

A

The process of retrieving a refrigerant in any condition from a system

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39
Q

What does Reclaim mean?

A

The process of turning old refrigerant into new (virgin) refrigerant

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40
Q

What does Recycle mean?

A

The process of retrieving refrigerant with purpose of using it in another system owned by the same owner

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41
Q

What are recovery devices?

A

Devices certified with a label by the EPA that can be used to retrieve refrigerant

42
Q

What is a passive recovery system?

A

Retrieves refrigerant with assistance from the system

43
Q

What type of hoses are to be avoid when retrieving refrigerant?

A

Long hoses with small diameters

44
Q

What is an active recovery system?

A

Retrieves refrigerant using help from itself or another appliance

45
Q

What has to be done for each time you recover a refrigerant?

A

Use a different cylinder to collect said refrigerant, even if its known to mix

46
Q

What must be done before using an electronic leak detector?

A

Check for flammability and if an electronic detector is prohibited on the system

47
Q

Whats the best way to find the general area of a leak?

A

Ultrasonic and electronic leak detectors

48
Q

What helps when using an electronic leak detector?

A

Charging the system with a tracer

49
Q

What must be done after leak repairing?

A

Install a new filter dryer before charging the system

50
Q

Whats the reason for dehydrating a system?

A

To remove water and water vapour

51
Q

What affects evacuation efficiency?

A

Size of equipment , ambient temperature, and amount of moisture in a system

52
Q

What type of gauge must be used when vacuuming a system?

A

Micron gauge

53
Q

How many microns to reach required vacuum

A

500 microns or lower

54
Q

How long should a micron gauge be for accurate readings?

A

It should be as short as possible

55
Q

What helps during dehydration time?

A

Heating up a system

56
Q

What does it mean if your system can’t hold a vacuum?

A

Probably has a leak

57
Q

What must be worn at all times while handling refrigerant?

A

Safety glasses and gloves and any other required equipment recommended by manufacturer

58
Q

Where must one pressurize a system with nitrogen?

A

At a single pressure regulator or relief valve down stream from it?

59
Q

What must never ever be done when leak checking?

A

Pressurizing a system with oxygen

60
Q

What must refrigerants never be exposed to?

A

Anything hot or open flames

61
Q

What must be check when dealing with solvents, chemicals or refrigerants?

A

Safety data sheets

62
Q

Is it okay to inhale refrigerant vapors?

A

No, unless you want to die

63
Q

What should always be checked when dealing with flammable refrigerants?

A

That the system is grounded

64
Q

What color marking should all tubes and pipes that have been used for flammable refrigerant be?

A

Red

65
Q

What must be done if a large amount of refrigerant is released?

A

Leave the area or wear protective masking

66
Q

What should be used to remove ice from sight glasses or viewing glasses?

A

Alcohol spray

67
Q

What must a refrigerant recovery cylinder be free of?

A

Rust, damage and filed below 80 percent of it’s weight

68
Q

Can recovery cylinders explode? and why?

A

Yes they can due to fire or hot areas

69
Q

What must a recovery system be tested for every 5 years

A

It must be hydro-statically

70
Q

Can disposable refrigerant be used to recover refrigerant?

A

No

71
Q

What must be attached when shipping cylinders with refrigerant inside?

A

A Department Of Transportation classification tag and label (DOT tag)

72
Q

What position should refrigerant tanks always be?

A

They should always be upright

73
Q

What is the definition of a small appliance?

A

Any appliance with 5 lbs or less of refrigerant full charged and hermetically sealed

74
Q

What is a type 1 technician?

A

A technician that can repair small small appliances

75
Q

What must everything be labeled when repairing or performing maintenance on a system?

A

EPA laboratory label

76
Q

What type of recovery systems can Type 1 technicians use?

A

Passive and active recovery systems

77
Q

What are ways to measure a system is at 80 percent or lower capacity?

A

Using a scale or internal float device

78
Q

What type of hoses must be used when pressure checking a system?

A

Self sealing or manual sealing valves

79
Q

Is it recommended to fix a small appliance with a leak?

A

It is not mandatory but if possible then do so

80
Q

What must be used to check if a cylinder is contaminated?

A

A temperature pressure chart should be used

81
Q

What must be done when compressor does not run?

A

The high and low side of the system must be assessed for refrigerant recovery

82
Q

Where should access valves be placed?

A

On the high and low side of the system

83
Q

Can you proceed with recovery if an appliance reads 0 PSIG after installing a piercing access valve?

A

No

84
Q

What does a pungent order mean when system recovering?

A

The compressor has burned out

85
Q

What can large refrigerants leaks cause?

A

Suffocation

86
Q

What are Type 2 technicians?

A

Technicians servicing medium, high and very high pressured applicances

87
Q

How do you determine system charge?

A

Use the name plate where the serial number is located

88
Q

What is the maximum leak rates for a year of comfort cooling?

A

10 percent

89
Q

What is the maximum leak rates for a year of commercial cooling?

A

20 percent

90
Q

What is the maximum leak rates for a year of industrial cooling?

A

30 percent

91
Q

What is the time rate to fix an appliance of 50 lbs or more leaking over the leak rate?

A

30 days

92
Q

Can having a not certified technician be used as an excuse for not fixing an appliance?

A

No

93
Q

Who keeps a record of leaks previously on a system?

A

The owner

94
Q

How many years should records be kept for a leak?

A

3 years

95
Q

What must be done after installing a split system?

A

It must be leak checked using an inert gas

96
Q

What is another step that must be done before recovering a system?

A

The systems total charge must be determined

97
Q

What must be done to cylinder before using it?

A

It must be evacuated to reduce pressure and remove noncondensables

98
Q

Where should you connect a hose to reduce recovery time?

A

It should be connected to the low side

99
Q

Who keeps record of any discarded appliance after recovering refrigerant?

A

The company that recovered the refrigerant

100
Q

For how long are records kept of any disposed appliances after they’re recovered?

A

3 years

EPA FlashCards (2 decks)

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