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EPA 100 Flashcard Core COPY

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
How much pressure is very high pressure?
Anything above 340 PSIG
26
What is the Montreal Protocol?
An international treaty that addresses ozone-depleting substances
27
What is the clean air act?
Clean Air act set regulations for refrigerant handling in the HVACR field
28
What is illegal to do with refrigerants?
Releasing them on purpose
29
What does the SNAP program do?
It identifies refrigerants with lower overall risk to the environment and people
30
Are desiccant dehumidifiers covered by the EPA Section 608?
No
31
Does the EPA require employees or companies to record any disposed appliances with 5-50 lbs of refrigerant?
No
32
Do you need to be EPA certified to buy carbon dioxide?
No
33
Is it illegal to top off a system using a refrigerant that isn't the same as the one in the system?
Yes
34
What must be done before discarding any cylinders?
Any refrigerant must be taken out, rendered useless and recycled
35
Can recovered refrigerants be released?
Nope,never ever
36
How big of quantities can isobutane be released from household freezers? If release-able at all?
Small quantites only
37
The three R's stand for?
Recovery, Reclaim, Recycle
38
What does Recover mean?
The process of retrieving a refrigerant in any condition from a system
39
What does Reclaim mean?
The process of turning old refrigerant into new (virgin) refrigerant
40
What does Recycle mean?
The process of retrieving refrigerant with purpose of using it in another system owned by the same owner
41
What are recovery devices?
Devices certified with a label by the EPA that can be used to retrieve refrigerant
42
What is a passive recovery system?
Retrieves refrigerant with assistance from the system
43
What type of hoses are to be avoid when retrieving refrigerant?
Long hoses with small diameters
44
What is an active recovery system?
Retrieves refrigerant using help from itself or another appliance
45
What has to be done for each time you recover a refrigerant?
Use a different cylinder to collect said refrigerant, even if its known to mix
46
What must be done before using an electronic leak detector?
Check for flammability and if an electronic detector is prohibited on the system
47
Whats the best way to find the general area of a leak?
Ultrasonic and electronic leak detectors
48
What helps when using an electronic leak detector?
Charging the system with a tracer
49
What must be done after leak repairing?
Install a new filter dryer before charging the system
50
Whats the reason for dehydrating a system?
To remove water and water vapour
51
What affects evacuation efficiency?
Size of equipment , ambient temperature, and amount of moisture in a system
52
What type of gauge must be used when vacuuming a system?
Micron gauge
53
How many microns to reach required vacuum
500 microns or lower
54
How long should a micron gauge be for accurate readings?
It should be as short as possible
55
What helps during dehydration time?
Heating up a system
56
What does it mean if your system can't hold a vacuum?
Probably has a leak
57
What must be worn at all times while handling refrigerant?
Safety glasses and gloves and any other required equipment recommended by manufacturer
58
Where must one pressurize a system with nitrogen?
At a single pressure regulator or relief valve down stream from it?
59
What must never ever be done when leak checking?
Pressurizing a system with oxygen
60
What must refrigerants never be exposed to?
Anything hot or open flames
61
What must be check when dealing with solvents, chemicals or refrigerants?
Safety data sheets
62
Is it okay to inhale refrigerant vapors?
No, unless you want to die
63
What should always be checked when dealing with flammable refrigerants?
That the system is grounded
64
What color marking should all tubes and pipes that have been used for flammable refrigerant be?
Red
65
What must be done if a large amount of refrigerant is released?
Leave the area or wear protective masking
66
What should be used to remove ice from sight glasses or viewing glasses?
Alcohol spray
67
What must a refrigerant recovery cylinder be free of?
Rust, damage and filed below 80 percent of it's weight
68
Can recovery cylinders explode? and why?
Yes they can due to fire or hot areas
69
What must a recovery system be tested for every 5 years
It must be hydro-statically
70
Can disposable refrigerant be used to recover refrigerant?
No
71
What must be attached when shipping cylinders with refrigerant inside?
A Department Of Transportation classification tag and label (DOT tag)
72
What position should refrigerant tanks always be?
They should always be upright
73
What is the definition of a small appliance?
Any appliance with 5 lbs or less of refrigerant full charged and hermetically sealed
74
What is a type 1 technician?
A technician that can repair small small appliances
75
What must everything be labeled when repairing or performing maintenance on a system?
EPA laboratory label
76
What type of recovery systems can Type 1 technicians use?
Passive and active recovery systems
77
What are ways to measure a system is at 80 percent or lower capacity?
Using a scale or internal float device
78
What type of hoses must be used when pressure checking a system?
Self sealing or manual sealing valves
79
Is it recommended to fix a small appliance with a leak?
It is not mandatory but if possible then do so
80
What must be used to check if a cylinder is contaminated?
A temperature pressure chart should be used
81
What must be done when compressor does not run?
The high and low side of the system must be assessed for refrigerant recovery
82
Where should access valves be placed?
On the high and low side of the system
83
Can you proceed with recovery if an appliance reads 0 PSIG after installing a piercing access valve?
No
84
What does a pungent order mean when system recovering?
The compressor has burned out
85
What can large refrigerants leaks cause?
Suffocation
86
What are Type 2 technicians?
Technicians servicing medium, high and very high pressured applicances
87
How do you determine system charge?
Use the name plate where the serial number is located
88
What is the maximum leak rates for a year of comfort cooling?
10 percent
89
What is the maximum leak rates for a year of commercial cooling?
20 percent
90
What is the maximum leak rates for a year of industrial cooling?
30 percent
91
What is the time rate to fix an appliance of 50 lbs or more leaking over the leak rate?
30 days
92
Can having a not certified technician be used as an excuse for not fixing an appliance?
No
93
Who keeps a record of leaks previously on a system?
The owner
94
How many years should records be kept for a leak?
3 years
95
What must be done after installing a split system?
It must be leak checked using an inert gas
96
What is another step that must be done before recovering a system?
The systems total charge must be determined
97
What must be done to cylinder before using it?
It must be evacuated to reduce pressure and remove noncondensables
98
Where should you connect a hose to reduce recovery time?
It should be connected to the low side
99
Who keeps record of any discarded appliance after recovering refrigerant?
The company that recovered the refrigerant
100
For how long are records kept of any disposed appliances after they're recovered?
3 years

EPA FlashCards (2 decks)

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