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608 Certification > Core > Flashcards

Core Flashcards

1
Q

Stratospheric ozone

A

Protective shield, ozone protects from ultraviolet radiation from the sun

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2
Q

ODP

A

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

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3
Q

What negative effects result from ozone depletion?

A

Increased rates of skin cancer, cataracts and negative effects on the environment, resulting in decreased crop yields and damage to marine organisms 

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4
Q

What is ozone made up of?

A

Three oxygen atoms

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5
Q

How is an ozone molecule affected by chlorine?

A

The chlorine takes one of the ozone’s three atoms forming a compound, called chlorine monoxide (CIO). CIO collides with another ozone molecule, releasing its oxygen atom.

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6
Q

A single chlorine atom can last in the stratosphere for _____ years and destroy up to ______ozone molecules

A

120 years destroying 100,000 ozone molecules

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7
Q

Does the chlorine in CFCs and HCFCs breakdown into compounds that dissolve in water or rain out of the atmosphere?

A

NO

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8
Q

GWP

A

Global warming potential. Established to provide comparisons of the global warming impacts of different gases over a span of time.

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9
Q

What is used as a baseline measurement for global warming potential with a value of 1?

A

Carbon dioxide

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10
Q

Which refrigerants have the lowest global warming potential?

A

Hydrocarbon (HC) and Hydrofluoroolefin (HFO)

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11
Q

HFCs have a _______ global warming potential, making them damaging to the environment

A

Very high

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12
Q

CFC

A

Chlorofluorocarbon. Highest ozone depletion potential. Examples: R-11 and R12

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13
Q

HCFC

A

Hydrochlorofluorocarbon. Contains hydrogen, chlorine, fluorine, and carbon. The hydrogen makes them less harmful to stratospheric ozone

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14
Q

HFC

A

Hydrofluorocarbon. Contain hydrogen, fluorine, and carbon atoms connected by single bonds. Lowest/no ozone depletion potential, but do have an effect on global warming

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15
Q

HFO

A

Hydrofluoroolefin. Contain hydrogen, fluorine, and carbon atoms connected with at least one double bond between the carbon atoms. No ozone depletion potential, but do you have a very small effect on global warming

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16
Q

HC

A

Hydrocarbon. Elementary compound of hydrogen and carbon. Although flammable, they post the least amount of danger to the environment considered natural refrigerants.

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17
Q

Can propane cylinders for grilling be used as refrigerant?

A

No. They contain impurities that can damage refrigerant equipment. 

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18
Q

Azeotropic

A

Refrigerant mixtures containing two or more refrigerant. Acts like a single or pure compound refrigerant

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19
Q

Zeotropic

A

Mixtures of components that have different boiling points. Blend the refrigerant associated with temperature glide.

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20
Q

Bubble point (liquid)

A

Values used when charging by condenser sub cooling

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21
Q

Dew Point (vapor)

A

Values used for charging by suction or evaporator superheat

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22
Q

How should zeotropic or near azeotropic blends of refrigerants be charged into the system?

A

By liquid

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23
Q

Fractionization

A

Refrigerant leaking at uneven rates due to different vapor pressures

24
Q

What EPA approved refrigerant can be used as direct drop in replacements to service an R 22 or any other system?

A

The EPA does not approve any substitute refrigerants as direct drop in replacements

25
Q

When retrofitting or converting a system to use a different refrigerant only ______ substitutes can be used.

A

EPA-approved

26
Q

Low Pressure refrigerant

A

30 psig or lower at 104 degrees liquid phase. Example: R11, R123

27
Q

Medium Pressure refrigerants

A

Between 30 psig and 155 psig at 104 degrees liquid phase. Examples: R12, R134, R1234YF

28
Q

High Pressure refrigerants

A

Between 155 psig and 340 psig at 104 degrees liquid phase. Examples: R22, R410, R717

29
Q

Very High pressure refrigerants

A

Over 340 psig at 104 degrees liquid phase. Example: R744 CO2

30
Q

What type of oil does HCFC refrigerant blends use?

A

Synthetic alkylbenzene

31
Q

What type of oil does HFC refrigerants use?

A

Esther based oils; they are hydroscopic and absorb moisture

32
Q

Montreal Protocol

A

An international treaty, that addresses, ozone, depleting substances and their alternatives

33
Q

As of 2017, a technician can be fined $_________ a per violation for violating the Clean Air Act.

A

$44,539

34
Q

In what year is the phase out for the production and imports of newly manufactured R22 and HCFC142 in the US?

A

2020

35
Q

And what year will all HCFC refrigerants be phased out?

A

2030

36
Q

Reclaimed, refrigerant must meet what AHRI standard?

A

AHRI standard 700

37
Q

Technicians can only charge used CFC, HCC, or HFC refrigerants back into the ______appliance or another appliance belonging to the _______owner.

A

Same owner. Used refrigerant unless reclaimed cannot change ownership.

38
Q

Recovery equipment must be tested according to a AHRI standard _____?

A

AHRI 740

39
Q

When disposing of appliances with 50 to 50 pounds of refrigerant, what must records include?

A

-type of refrigerant
-quantity of refrigerant, by type
-Quantity recovered from dispose of appliances in each calendar month
-Quantity of refrigerant, by type, sent for reclamation or destruction

40
Q

What type of refrigerant can be vented and does not require 608 certification?

A

Carbon Dioxide R744

41
Q

Can you top off a refrigerant system with another type of refrigerant?

A

No. This can void equipment warranty, ruin the refrigerant, damage, the equipment, and cause personal injury, or death.

42
Q

Recover

A

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

43
Q

Recycle

A

To extract, refrigerant from an appliance and clean the refrigerant for use in equipment of the same owner without meeting the requirements for reclamation

44
Q

Recycling equipment must meet what AHRI standard?

A

AHRI 740

45
Q

Reclaim

A

To process refrigerant to a level equal to new “virgin” product. Must meet AHRI 700 standards

46
Q

System dependent (passive) recovery

A

Capture refrigerant with the assistance of components in the appliance from which refrigerant is being recovered (compressor etc)

47
Q

Self-contained (active) recovery

A

Has its own means to draw refrigerant out of the appliance. Example: recovery machine

48
Q

Low ambient temperatures or long hoses between the unit and recovery machine _________ recovery time

A

Increase

49
Q

What type of hoses should be used for the recovery of refrigerant?

A

Short as possible and large diameter hoses

50
Q

How should newly install systems be checked for leaks?

A

System should be pressurized with dry nitrogen for leak detection purposes. If any electronic leak detector is to be used, a trace refrigerant can be added along with dry nitrogen. Soap bubbles can pinpoint the leak.

51
Q

Evacuate to ______ microns

A

500 or lower

52
Q

Dehydration

A

Purpose is to remove water and water vapor from the system. Moisture and the system can cause hydrochloric and hydrofluoric acids to form.

53
Q

For accurate readings during system evacuation, vacuum gauge should be connected where in relation to the pump?

A

As far away from the vacuum pump as possible. Measuring final system, vacuum should be done with system, isolated and pump off.

54
Q

When pressurizing the system with nitrogen, you should always charge through a _________?

A

Pressure regulator and relief valve downstream from the regulator. If using multiple relief valves, they should be installed in parallel to each other.

55
Q

Recovery cylinders should be filled to no more than _____% of its capacity by weight 

A

80%

56
Q

A reusable container for refrigerant that is under high-pressure (above 15psig) must be hydrostatically tested every _____ years?

A

5 years

57
Q

Recovery tanks have ______bodies and ______tops

A

Grey bodies and yellow tops

608 Certification (4 decks)

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