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epa Flashcards

1
Q

What is ODP and what does it do.

A

Ozone depletion potential measures the ability of a substance to destroy ozone in the stratosphere

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2
Q

how many ozone molecules can a single cholrine molecule destroy

A

100,000

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3
Q

what are HFCs

A

they are compounds made up of hydrogens fluoride and carbons

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4
Q

what is GWP

A

global warming potential

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5
Q

what GWP is used as a baseline measurement and what is its value

A

Carbon dioxide with a value of 1

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6
Q

what compounds have low GWP

A

Hydrocarbons and hydrofluoroolefin

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7
Q

true or false,Because Hydrofluoroolefin refrigerants are non depleting and have very low GWP this makes it a good fit for HVACR equipment

A

true

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8
Q

true or false, HFCs have very low GWP and are also good for the enviroment

A

false

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9
Q

true or false, when talking about safety identification for refrigerants Class B is the safe non toxic group.

A

false

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10
Q

true or false, when talking about flammability for refrigerants 1 indicates no flammability, 2 low flammability, 3 high flammability

A

true

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11
Q

What refrigerants have the highest ODP and are the most harmful to the environment

A

CFC refrigerants

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12
Q

What refrigerants have a ODP that ranges between 0 and 1

A

HCFC refrigerants

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13
Q

What refrigerants have little to no ODP but have a very small effect on global warming

A

HFC refrigerants

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14
Q

What refrigerants have no ODP and are mildly flammable

A

HFO refrigerants

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15
Q

What refrigerants are an elementary compound and pose the least danger to the environment.

A

HC refrigerants

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16
Q

What are azeotropic refrigerant

A

Mixtures that contain two or more refrigerants,

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17
Q

What are zeotropic refrigerants

A

Mixtures of components that have different boiling points Also called non-azeotropic

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18
Q

When charging by suction or evaporator superheat what values are used

A

dew point(vapor)

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19
Q

When charging by condenser sub cooling what values are used

A

bubble point(liquid)

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20
Q

What is the proper charging method for R400 series blended refrigerants

A

Weigh the refrigerant into the high side of the system as a liquid

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21
Q

true or false, The EPA does not approve any substitute refrigerants as direct drop-in replacements to serve an r-22 or any other system

A

true

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22
Q

Low pressure refrigerants have what pressure at 104degrees Fahrenheit

A

30 psig or lower

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23
Q

Medium pressure refrigerants have what pressure at 104degrees Fahrenheit

A

A pressure between 30psig-155 psig

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24
Q

high pressure temperature refrigerants have what pressure at 104degrees Fahrenheit

A

A pressure between 155psig- 340psig

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25
Q

very high pressure temperature refrigerants have what pressure at 104degrees Fahrenheit

A

A pressure above 340psig

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26
Q

what is the Montreal protocol

A

international treaty that addresses ozone-depleting substances and their alternatives

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27
Q

what refrigerants are starting to be phased out or have been phased out completely

A

CFCs and HCFCs

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28
Q

It is ____ to knowingly release CFC, HCFC or HFC refrigerants during the service, maintenance, repair, or disposal of appliances

A

illegal

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29
Q

true or false, A person is required to be a 608 certified technician when servicing an external electric circuit or sections of the system that do not involve the refrigerant components of an HVACR appliance

A

false

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30
Q

What does the clean air act allow to be used for leak detection

A

a small amount of refrigerant with mitrogen

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31
Q

By what year will all HCFC be phased out

A

2030

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32
Q

true or false, It is a violation of the refrigerant management regulations under the Clean Air Act after to service a system that uses phased out refrigerants

A

false

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33
Q

reclaimed refrigerant must meet what condition in order to be resold

A

It must meet the AHRI standard 700

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34
Q

_____- recovery devices remove refrigerant from an appliance without the assistance of components in the appliance

A

self contained

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35
Q

_____- recovery devices remove refrigerant from an appliance with the assistance of components in the appliance

A

system dependent

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36
Q

The EPA requires appliances that do not have service valves to contain a _____

A

service aperture or process stub

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37
Q

When disposing appliances with ______ pounds of refrigerants technicians are not required to record the model and serial number of the appliance

A

5-50

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38
Q

Record that need to be kept when recovering refrigerant are?

A

type of refrigerant, quantity of refrigerant, quantity recovered from disposed appliances in each calendar month, and quantity of refrigerant sent for reclamation or destruction

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39
Q

true or false, Natural refrigerants such as carbon dioxide need to be purchased by someone who is section 608 certified

A

false

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40
Q

true or false, it is unlawful to service R22 systems and use existing supplies of R22

A

false

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41
Q

true or false, it is not legal to top off an R22 charge with another refrigerant such as R410a

A

true

42
Q

What is the proper way to discard disposable cylinders of CFCs, HCFC, HFCs. or HFO

A

recover all remaining refrigerant, render the cylinder useless, and recycle the metal

43
Q

what needs to be done before disposing any appliance containing a CFC, HCFC, or HFC refrigerant

A

Refrigerant must be recovered to the EPA recovery or evacuation levels

44
Q

According to the safe disposal requirements the final person in the disposal chain is responsible for what

A

Ensuring that any CFC,HCFC, or HFC refrigerant has been removed from household refrigerators or other appliances before they are disposed of

45
Q

Knowingly releasing ____________ refrigerant during service, maintenance, repair, etc is illegal

A

CFC, HCFC, HFC, HFO

46
Q

true or false, venting refrigerant from a recovery machine or recovery cylinder after use is legal

A

false

47
Q

true or false, records of recovered refrigerant must be kept to ensure venting does not take place after recovery from an appliance

A

true

48
Q

Small quantities of _____ used in household freezers can be vented

A

isobutane

49
Q

true or false, releasing mixtures of nitrogen and refrigerant that result from adding nitrogen to a full charged system to leak check it is considered a violation of the prohibition on venting

A

true

50
Q

How much refrigerant has to be added to nitrogen in order for it to be considered a leak trace gas

A

Only a few ounces

51
Q

What does it mean to recover?

A

To remove refrigerant in any condition from a system and store it in an approved recovery cylinder or container.

52
Q

True or false, Recovered refrigerant may not be charged into the same system, or into another system with the same ownership

A

false

53
Q

What does it mean to recycle

A

means to extract refrigerant from an appliance and clean the refrigerant for reuse in equipment of the same owner without meeting all of the requirements for reclamation

54
Q

when recycling refrigerant from an appliance, does it apply to motor vehicle air conditioner or MVACs as well.

A

no they are exempt from this

55
Q

How is refrigerant cleaned

A

It is cleaned by using oil separation and single or multiple passes through devices such as core filter driers to remove particulate matter

56
Q

Recycling equipment must meet this requirement in order to be used

A

They must meet the AHRI 740 performance ratio standard

57
Q

what does it mean to reclaim

A

to process refrigerant o a level equal to new product specifications as determined by chemical analysis

58
Q

true or false reclaiming is usually preformed at a chemical processing company

A

true

59
Q

Refrigerant recovery and/or recycling equipment manufactured after ______ must be certified and labeled by an EPA approved equipment testing organization to meet EPA standards

A

November 15,1993

60
Q

What is required on all new recovery equipment

A

EPA approved certification label

61
Q

What are the two types of recovery devices

A

System dependent, and self contained

62
Q

The recovery time will be ____ if the appliance is located in low ambient temperature or long hoses are used between the unit and the recovery machine

A

increased

63
Q

What should be type of hoses should be avoided when connecting the unit to the recovering machine

A

long and small diameter hoses

64
Q

why do long and small diameters need to be avoided

A

They cause excessive pressure drop and increase recovery time

65
Q

What needs to be done upon the completion of refrigerant liquid transfer between the recovery unit and the refrigerant system

A

A technician must guard against the trapping of liquid refrigerant in the service hose between closed service valves

66
Q

The technician must have a ____ refrigerant recovery cylinder for each type of refrigerant recovered

A

separate

67
Q

true or false it is okay to have a single cylinder for refrigerants that are known to be mixed

A

false

68
Q

How many cylinders are required if you are servicing a system that uses HFC-134a, HFC410a, and HCFC-22

A

3

69
Q

true or false it is fine for someone to mix refrigerants in the same containers when recovering refrigerants

A

false

70
Q

what happens when refrigerants are mixed

A

They maybe impossible to reclaim and there maybe an additional cost to have them destroyed

71
Q

In order for used refrigerant to change ownership what needs to be done

A

They need to be reclaim and pass the AHRI standard for virgin refrigerant

72
Q

true or false, it is okay for you to use any leak detector with flammable refrigerant

A

False

73
Q

What is the most effective way to determine the general area of a leak

A

Using an electronic or ultrasonic leak detector

74
Q

Newly installed systems should be pressurized with______ for leak detection purposes

A

dry-nitrogen

75
Q

true or False, the trace gas can be different than the refrigerant the appliance is going to be charged with

A

false

76
Q

true or false, a leak trace gas is considered a refrigerant

A

false

77
Q

what should a technician do upon the completion of a leak repair

A

install a new filter drier and complete a standing pressure leak check at the maximum system pressure

78
Q

Any system designed t0 contain a flammable HC or HFO refrigerant has to have a ____ before evacuating to 500 microns or less

A

leak test

79
Q

true or false, Odarants need to be added to a system containing flammable refrigerants

A

false

80
Q

What does it mean to dehydrate a refrigeration system

A

To remove water and water vapor from the system

81
Q

What occurs if water and water vapors are allowed to remain in a system

A

Hydrochloric and hydrofluoric acids may form

82
Q

true or false, it is possible to over evacuate a system

A

false

83
Q

What do most manufacturers require a system evacuation to be

A

500 microns or less

84
Q

true or false, never evacuate a system to the ambient air without first following props recovery procedures and attaining the mandated recovery level required by the EPA regulations

A

true

85
Q

What are the factors that affect the speed and efficiency of evacuation

A

ambient temperature, amount of moisture n the system, size of the vacuum pump and vacuum lines

86
Q

Vacuum lines should be ______ than the pump intake connections

A

equal to or greater than

87
Q

true or false, the way a micron gauge is connected may affect the speed of evacuation

A

true

88
Q

the piping connection to the vacuum pump should be as ____ in length as possible and as ___ in diameter as possible

A

short;long

89
Q

How do you get accurate readings during an evacuation

A

The system vacuum gauge should be as far away from the vacuum pump as possible

90
Q

a system that can not hold a vacuum most likely has what

A

a leak

91
Q

What may a technician do to speed up dehydration time

A

They may heat up the system

92
Q

What may a technician do to release refrigerant trapped in oil

A

tap the compressor with a mallet

93
Q

what is an indicator that moisture is still stuck in the system

A

if the pressure rises, stops, and then continues to rise

94
Q

A refrigerant recovery cylinder should not be filled more than __ of its capacity by weight

A

80%

95
Q

How do you identify refrigerant recovery cylinders

A

they have gray bodies with a yellow colored top

96
Q

true or false the pitch of the recovery device controls the fill level of the recovery cylinder

A

false

97
Q

true or false a disposable refrigerant cylinder may be used to recover refrigerant

A

false

98
Q

when shipping used refrigerants what needs to be placed on the cylinders

A

A refrigerant label to identify the type of refrigerant to avoid accidental mixing

99
Q

What do DOT Regulations require

A

the number of cylinders be recorded on the shipping papers for hazard class 2.2 nonflammable compressed gases

100
Q

What position do refrigerant cylinders need to be in when they are shipped

A

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epa exam (1 decks)

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