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EPA Certification Exam > Review > Flashcards

Review Flashcards

1
Q

Ozone Depletion Potential

A

A measure of refrigerants ability to destroy the ozone

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2
Q

Global warming potential

A

The measure of refrigerants ability to add to global warming

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3
Q

CFCs ODP and GWP

A

ODP one GWP 10,900

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4
Q

How many ozone molecules can one chlorine Atom kill

A

100,000

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5
Q

What is a blend

A

Two or more refrigerants used together

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6
Q

Azeotropic

A

Blend of refrigerant that acts as one (has no temperature glide)

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7
Q

Azeotropic

A

Blend of refrigerant that acts as one

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8
Q

zeotropic

A

Blend of refrigerants that boil at different temperatures (individually)

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9
Q

Temperature glide

A

the range of boiling points or condensing points throughout the evaporator and condenser

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10
Q

Temperature glide

A

The difference between vapor and liquid State during evaporation and condensing

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11
Q

Type of oil in HFC

A

Poe (HYGROSCOPIC)

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12
Q

HCFC and CFC oil

A

AB or MO

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13
Q

What is hygroscopic

A

Holds and absorbs water

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14
Q

Type I

A

Small appliances 5 pounds of refrigerant or less

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15
Q

Type II

A

High & very high pressure refrigerant

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16
Q

Type II

A

High & very high pressure refrigerant

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17
Q

Type III

A

Low pressure systems (chillers)

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18
Q

What is Ozone made of

A

Three oxygen Atoms

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19
Q

Depletion of ozone causes

A

Skin cancer, crop lost, I disease, reduce marine life, increase ground-level zone

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20
Q

What else causes chlorine in the ozone

A

Volcanoes

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21
Q

What does CFC stand for

A

Chlorine fluorine carbon

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22
Q

What does HCFC stand for

A

Hydrogen chlorine fluorine carbon

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23
Q

What does HFC stand for

A

Hydrogen fluorine carbon

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24
Q

What is the cost per day for violating the EPA

A

$27,500

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25
Q

How much you get for snitching to the EPA

A

10 G’s niggah

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26
Q

Do you have to keep a log of refrigerant use

A

Yes

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27
Q

How should refrigeration systems be charged

A

As liquid into the high side

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28
Q

How should refrigeration systems be charged

A

As liquid

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29
Q

What is hygroscopic oil

A

Oil that easily absorbs water

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30
Q

How much of the vacuum should you pull for proper dehydration

A

500 µ

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31
Q

what is the purpose of the metering device

A

reduce pressure and saturation temp

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32
Q

what happens in the evaporator

A

heat is absorbed causing refrigerant to boil from liquid to vapor. the refrigerant vapor then travels to the inlet of the compressor

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33
Q

what happens in the compressor

A

refrigerant is compressed and moves to the inlet of the condenser

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34
Q

what happens in the condenser

A

high temperature high pressure vapor refrigerant expels its heat and the refrigerant condenses to a liquid. this high pressure liquid is then delivered to the metering device

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35
Q

you must be certified to service, maintain, and dispose appliances as of

A

Nov, 14, 1994

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36
Q

violation to vent CFC and HCFC as of

A

July 1, 1992

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37
Q

violation to vent HFC as of

A

Nov, 15, 1995

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38
Q

can you add nitrogen to a fully charged system

A

NO

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39
Q

CFC phased out as of

A

Dec 31, 1995

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40
Q

what is the montreal protocol

A

an international treaty regulating use of CFC HCFC etc

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41
Q

RECOVER

A

to remove refrigerant and store it in an external container

42
Q

RECYCLE

A

to CLEAN refrigerant for reuse by separating iol and removing the moisture by passing it thru a filter drier

43
Q

RECLAIM

A

restore refrigerant to VIRGIN by EPA standard to be resold

44
Q

system dependent recovery device

A

assistance of appliance components to recover

45
Q

self contained recovery device

A

own means of recovering

46
Q

sale of refrigerants is restricted to licensed technicians as of

A

Nov 14 1994

47
Q

can ester oils be mixed with other refrigerants

A

refrigerant oils can never be mixed together

48
Q

ternary blend

A

3 part refrigerant blend

49
Q

when there is a refrigerant leak from a blended refrigerant how will the leak happen

A

the different refrigerants will leak at uneven rates

50
Q

systems that use class I and class II refrigerant require what

A

a service stub for easy recovery

51
Q

what must be done if you discover a system has been charged with multiple refrigerants

A

they must be recovered into a separate tank

52
Q

what must be done if you discover a system has been charged with multiple refrigerants

A

they must be recovered into a separate tank do not mix refrigerants

53
Q

if nitrogen is used to flush debris out of a system can it be vented

A

yes

54
Q

what will happen if a long hose is used to recover

A

large pressure drop, increased recovery time, potential for increased emissions

55
Q

what is pressure temperature relationship have to do with recovery

A

lower ambient temp means slower recovery

56
Q

how do you determine the general area of a leak

A

electronic or ultra sonic leak detector

57
Q

how to find a leak when the general area is already known

A

bubble test

58
Q

why do we pull vacuum or “dehydrate”

A

to remove water and moisture from the system

59
Q

what can form if a system is not dehydrated

A

hydrochloric and hydrofloric acid

60
Q

how to dehydrate a system

A

evacuate

61
Q

can disposable cylinders be used to recover

A

NO

62
Q

what is the fill limit of a recovery cylinder

A

80% of its capacity weight

63
Q

recovery cylinders must be tested every

A

5 years

64
Q

refillable cylinders must be ___ approved

A

DOT

65
Q

if recovery cylinder has rust

A

reduce to 0 psi and discard

66
Q

when charging with nitrogen always charge thru

A

pressure regulator

67
Q

relief valves

A

must not be installed in series and must be replaced if there is signs of corrosion

68
Q

scba is required if

A

large leak in confined area

69
Q

scba is required if

A

large leak in confined area if not available vacate and ventilate the area

70
Q

r22 and r12 turn into ____ if exposed to open flame or red hot metal

A

hydrochloric and hydrofluoric acid and phosphorus gas

71
Q

cylinders must be ____ when shipped

A

in upright position and DOT tagged

72
Q

recovery equipment used for small appliances manufactured before nov 15 1993 must be capable of removing __%

A

80% whether or not compressor is operating or achieve a 4” vacuum (ARI 740)

73
Q

recovery equipment used for small appliances manufactured before nov 15 1993 must be capable of removing __%

A

80% whether or not compressor is operating or achieve a 4” vacuum (ARI 740)

74
Q

recovery equipment used for small appliances manufactured after nov 15 1993 must be capable of

A

recovering 90% if compressor is operating 80% if not

or 4” vacuum (ARI 740)

75
Q

small appliance leaks should be repaired when

A

whenever possible

76
Q

small appliance leaks should be repaired when

A

not required butwhenever possible

77
Q

small appliance leaks should be repaired when

A

not required but whenever possible

78
Q

before recovering it is important to know

A

type of refrigerant in the system

79
Q

air in a refrigeration system will cause what

A

higher discharge pressure

80
Q

system dependent equipment captures refrigerant with

A

assistance of the appliance compressor, external heat source,or vacuum pump

81
Q

when using a system dependent recovery device you should if the compressor works

A

run the compressor and recover from the high side

82
Q

when recovering small appliances if the compressor does not run you should

A

access not high and low side of system, heat and tap compressor to release trapped refrigerant

83
Q

make sure tanks do not have what in them

A

air

84
Q

shops must have what to recover from systems with non working compressors

A

atlas one self contained recovery device

85
Q

shops must have what to recover from systems with non working compressors

A

atleast one self contained recovery device

86
Q

system dependent recovery devices can only be used on what type of appliances

A

appliances with 15lbs or refrigerant or less

87
Q

what must be done to access fitting before recovering

A

leak check

88
Q

what is an indication of a compressor burn out

A

strong odor during recovery

89
Q

access fitting should not be _____

A

perminant

90
Q

access fitting should not be _____

A

permanent

91
Q

refrigerators built before 1950s may have

A

methyl formate, methyl chloride, or sulfur dioxide and should not be recovered with current devices

92
Q

appliances used in RVs contain

A

water, ammonia, hydrogen, water and should not be recovered with current equipment

93
Q

excessive super heat indication of (high pressure)

A

low charge and or leak

94
Q

over 50 lbs charge (comfort cooling) must be repaired if over ___% annual leak

A

15%

95
Q

over 50 lbs charge (commercial or industrial) must be repaired if over ___% annual leak

A

35%

96
Q

what should be checked before using a recovery unit (II)

A

valve positions, oil level, evacuate and recover remaining refrigerant from receiver

97
Q

using 134a requires what

A

its own set of gauges

98
Q

what can be done to speed up recovery

A

pack cylinder in ice and apply heat to appliance

99
Q

roof top units should be recovered by

A

liquid line entering the evaporator

100
Q

evacuate empty cylinders before recovering

A

quick couplers self sealing hoses and hand valves should be used to minimize release of refrigerant

101
Q

recovery equipment must be EPA certified as of

A

nov 15 1993

EPA Certification Exam (6 decks)

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