EPA 608 Study Guide

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In which component of a system does the refrigerant change from a high-pressure vapor to a high-pressure liquid

Condenser

The low-side test-pressure data-plate value should be used by a technician to determine a safe pressure for

Leak testing

After refrigerant liquid transfer between recovery unit and the system being emptied you need to avoid trapping

Liquid refrigerant between service valves

Which international agreement (treaty) regulated the production and use of CFCs, HCFCs, halons, methyl chloroform and carbon tetrachloride

Montreal protocol

When can you use a disposable cylinder to recover refrigerant

Never

Ester-based oils can be mixed with

No the oils

It has been illegal to vent substitutes for CFC & HCFC refrigerants since

November 1995

When using nitrogen to pressurize a system you should

Only charge with nitrogen vapor

We dealing with small systems how many different refrigerants may be recovered into the same cylinder

Only one

What type of synthetic oils are commonly used in new HFC systems and for retrofitting HCFC equipment to HFC refrigerants

Polyester

Systems charged with R-134a should be leak checked with:

Pressurized nitrogen

Which of the following refrigerant has a GWP of "1"

R-1234ze

Which of the following refrigerants is an HFO

R-1234ze

Which refrigerant is an HCFC

R-124

If a technician has a system where some R-502 was added to a R-22 system. The technician should:

Recover all the refrigerant into a separate tank

Before you dispose of any system containing a refrigerant you must:

Recover the refrigerant

What must be done before disposing of any appliance containing a CFC, HCFC, or HFC refrigerant

Recover the refrigerant

During servicing of a refrigeration system containing R-12 The refrigerant must be:

Recovered

A cylinder with a gray body and a yellow top indicates that the cylinder is designed to hold:

Recovered refrigerant

____ Refers to the process of cleaning refrigerant by oil separation and single or multiple passes through filter-driers, which reduce moisture and acidity

Recycling

When using nitrogen in repairing a sealed refrigeration system, what should the nitrogen tank always be equipped with

Regulator

Which of the following repairs would always be considered "major" under EPA regulations

Replacement of an evaporator coil

It is the best practice to use dry nitrogen to break the vacuum when dehydrating by the triple evacuation method. However, it:

Requires a pressure regulator

Which of the following is true if a system will not hold the vacuum after it has been evacuated

The system may be leaking

An ozone molecule contains

Three oxygen atoms

The color code for approved refrigerant recovery cylinders is

Yellow tops and gray bodies

Approved refrigerant recovery cylinders can be identified by which color code

Yellow tops and grey bodies

Even though R-22 is considered non-toxic it:

can cause asphyxia

An award of up to what amount may be paid to a person supplying information that leads to a penalty against a technician who is intentionally venting

$10,000

How much can a person be fined per day per violation for knowingly releasing a regulated substance that violates the clean air act

$44,539

To scrap a disposable cylinder the internal cylinder pressure should be reduced to at least

0 psig

The high pressure gauge on service manifold sets has a continuous scale, usually calibrated to read from:

0-500 psi

A single chlorine atom can destroy how many ozone molecules

100,000

Each chlorine atom in the stratosphere can destroy ____ ozone molecules.

100,000

CFCs will no longer be manufactured or imported into the United States after:

1995

Reusable refrigerant containers that are normally under pressure above 15 psig, must be hydrostatically tested and date stamped every:

5 years

Reusable refrigerant containers under high-pressure must be hydrostatically tested how often

5 years

When an HFC system with POE oil has been opened for a major system repair what is the minimum evacuation level that should be achieved before charging the system

500 µm(microns)

A refillable refrigerant cylinder must never be filled to more than ________ of its capacity by weight:

80%

All recovery equipment currently being made is required to have

A EPA approved certification label

When a pungent order is detected during a sealed system recovery and/or repair which of the following is most likely

A compressor burnout has occurred

Ozone depletion potential or ODP is:

A measure of the ability of CFCs' and HCFCs' to destroy ozone.

It is necessary to place a refrigerant label on

A refrigerant cylinder which is being returned for reclaiming

What are the two factors that if present are most likely to lead to an explosion with hydrocarbon refrigerants

A sufficient concentration of the refrigerant in the space and an ignition source

The Montreal protocol is:

A treaty among nations that controls production of CFCs and HCFCs

According to ASHRAE's 1992 refrigerant safety classification, which designations is the most safe

A-1

Which ASHRAE classification means slightly flammable

A2L

Under EPA's regulations what standard must reclaimed refrigerant meet before I can be resold

ARI 700

Recycling and recovery equipment intended for use with air-conditioning and refrigeration equipment except for small appliances must be tested under

ARI 740

Which of the following is an approved "drop-in" service replacement for R-12

According to the EPA there are no drop in replacements

When moisture exists in an operating system which of the following is most likely to occur

Acid will form

The synthetic lubricant presently used with ternary blends containing HCFC's is:

Alkylbenzene

According to the EPA when dealing with customer complaints regarding additional costs due to refrigerant recovery efforts the technician should

All of the above

Data shows that chlorine in the stratosphere comes mainly from CFCs rather than from natural sources such as volcanoes because:

All of the above

Refrigeration technicians who violate the clean air act can

All of the above

Which safety precautions should always be followed

All of the above

R-410A is not a typical blended refrigerant because:

All of the above are true-it is a near azeotropic refrigerant and it can be charged as either a liquid or a vapor and while it has a 400 series refrigerant number it behaves like a 500 series refrigerant

What factors affect the speed of evacuation

All of the above including the size of the equipment being evacuated and the ambient temperature and the amount of moisture in the system

When using recovery unit the fill level of the recovery tank can be controlled by:

All of the above- mechanical float switch and electric shut off device and weight

When operating refrigerant recovery or recycling equipment the following precautions should always be followed

All of the above- including wear safety glasses wear protective gloves follow all safety precautions for the equipment

The recovery of refrigerants is necessary to:

All of the above- maintain adequate supplies for service calls after the production bans. prevent the venting of refrigerants to the atmosphere. prevent stratospheric ozone depletion.

Refrigerant cylinders should always be

All of the above-free of rust and damage and color-coded to indicate the contents and secure

Never use an open flame to heat a refrigerant tank because:

All of the above-it can result in venting refrigerant to the atmosphere and the tank may explode causing serious injury to people nearby and refrigerant in the tank may decompose forming a toxic material

Which refrigerant(s) must be recovered before opening a system or disposing of a system

All refrigerants must be recovered- R-410a , R-407c, R-134a

Use ___________________ to remove ice from a sight glass

An alcohol spray

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

An alcohol spray

Which of the following human health effects could result from an increase in ultraviolet radiation

An increase in cataracts cases

What is the Montreal protocol

An international treaty that addresses O'zone depleting substances and their alternatives

A very large refrigerant leak can cause suffocation because refrigerants

Are heavier than air and displace oxygen

HCFC refrigerants:

Are less harmful to the stratospheric ozone in CFCs

In general blended refrigerants should be charged

As a liquid

To obtain an accurate vacuum readings during system evacuation the system vacuum gauge should be located colon

As far from the vacuum pump as possible

When evacuating a system the hoses should be

As short in length and as large in diameter as possible

The proper method of discarding a disposable refrigerant cylinder is to:

Assure that all refrigerant is recovered and that the cylinder is rendered useless then recycle the metal

When transporting cylinders containing used refrigerant the DOT requires that you:

Attach DOT classification tags

Which type of refrigerant is the most harmful to stratospheric ozone

CFC

Which of the following has the highest Ozone depletion potential

CFCs

Which type of refrigerant has the highest ozone depletion potential

CFCs

of the refrigerant listed below which refrigerant type have the highest ozone depletion potential

CFCs

Self-contained recovery devices:

Can capture liquid and or vapor refrigerant without the assistance of components in the air conditioning or refrigeration equipment

What is being done in the US. To stop Damage to the stratospheric ozone layer

Capturing and ultimately eliminating use of chlorofluorocarbons

Which of the following gases is used as the baseline measurement for global warming potential

Carbon dioxide

When evacuating a system the use of a severely oversized vacuum pump could

Cause trapped water to freeze

The condenser

Changes a high-pressure vapor to a high-pressure liquid

The compressor

Changes a low-pressure vapor to a high-pressure vapor

When using nitrogen to pressurize the system you should always:

Charge through a pressure regulator

The molecule found in CFCs and HCFCs that depletes ozone is

Chlorine

Which atom of the CFC molecule causes ozone depletion

Chlorine

The chemical was found in the upper stratosphere and that indicates that the ozone layer is being destroyed

Chlorine monoxide

Which leak repair category does the EPA define as air conditioning appliances used to provide cooling in order to control heat and humidity in occupied facilities including but not limited to residential, office, and commercial buildings

Comfort cooling

In a refrigeration system the device that changes a low pressure vapor to a high-pressure vapor is the:

Compressor

In a refrigeration system high pressure vapor is converted to high pressure liquid in the

Condenser

When dehydrating a system, the system can be heated to:

Decrease the dehydration time

Before shipping any used refrigerant cylinders check that the cylinder meets what standards

Department of transportation

Crop loss, eye disease, and skin cancer have been attributed to

Depletion of stratospheric ozone

Recover any remaining refrigerant and then render the cylinder useless then recycle the metal is the proper disposal method for

Disposable cylinders

The over-evacuation of a system

Does not occur

Which gases would cause the least amount of damage to the environment during a leak check

Dry nitrogen

What is the significant new alternatives policy (SNAP) program

EPA's program that identifies refrigerant with lower overall risks to human health and the environment

According to the EPA a ____________ leak detection methods is considered to be the most effective for locating the general area of a small leak

Electronic or ultrasonic tester

The type of oil that is most commonly used in stationary air conditioning applications with HFC -410a refrigerant is:

Ester oil

The type of oil that is most commonly used in stationary refrigeration applications with HFC-134a refrigerant is

Ester oil

Under the EPA safe disposal requirements the person responsible for making sure that the refrigerant has been removed from the household refrigerators before they are disposed of is the

Final person in the disposal chain

According to EPA regulations which of the following is procedures is not an approved technique for the system clean up after a burn out

Flushing with liquid refrigerant to clean tubing

Ozone depletion in the stratosphere is what type of problem

Global

A refrigerant cylinder designed to hold recovered refrigerant has a

Gray body and yellow top

Of the refrigerant listed below which types of refrigerant Will not damage stratospheric ozone

HFC's

Which type of refrigerants or chlorine free

HFC's

Which type of refrigerant contains no chlorine

HFCs

Silicone elastomers, for use in seals and gaskets, are not compatible with which refrigerants

HFOs

Personal protective equipment like gloves safety glasses safety shoes etc. should always be worn is when:

Handling and filling refrigerant cylinders

Refrigerant cannot be called "reclaimed" unless it

Has been chemically analyzed and the refrigerant meets the ARI-700 purity standard

Refrigerant leaves the condenser of an operating system as

High pressure liquid

What is the state of the refrigerant leaving the receiver in a refrigeration system

High pressure liquid

HFC refrigerant contain

Hydrogen fluorine and carbon

HCFCs contain

Hydrogen, fluorine, chlorine and carbon

Blended refrigerant leak from a system:

In uneven amounts due to different vapor pressures

Non-azeotropic refrigerant leak from a system

In uneven amounts due to different vapor pressures

What effect will low ambient temperatures have on recovery

Increase the recovery time

What is one of the most serious results of damage to the ozone layer

Increases in human skin cancer

The clean air act

Is all of the above including set a schedule for the phase out of CFC/HCFC Production and prohibits venting of refrigerant and authorizes the EPA to set standards for recovery of refrigerants

What statement is true about an azeotropic refrigerant mixture

It is a mixture that acts like a single component refrigerant over its entire range

It is illegal to

Knowingly release any refrigerant during the service maintenance repair or disposal of appliances with the exception of the de minimis releases

Refrigerant that enters the compressor under normal operating conditions is a

Low pressure vapor

What is the state of the refrigerant entering the compressor of a refrigeration system

Low pressure vapor

You can determine safe pressure for leak testing a system from the

Low side test pressure data plate value

When using with any solvent, cleaner, chemical or refrigerant you should review:

Material safety data sheets

After recovering refrigerant from a sealed system if nitrogen is used to pressurize or below debris out of the system the nitrogen

May be vented to the ambient air

What is the best proof that CFCs are in the stratosphere

Measurements of CFCs in air samples from the stratosphere

Ozone in the stratosphere above the earth consists of

Molecules of three oxygen atoms

Systems charged with R-410A should be leak checked with:

Pressurized nitrogen

A compound pressure gauge, typically used on the low side of the system, measure pressure in:

Psig and inches of mercury

Which refrigerant contains a CFC

R-12

Which refrigerant listed below is a "low-pressure"refrigerant under EPA's refrigerant recycling regulations

R-123

Which refrigerant is an HCFC?

R-123, R-124, R-22

Which of the following is a "very high pressure" refrigerant under EPA's refrigerant recycling regulations

R-13

An example of an HFC refrigerant is:

R-134a

Of the refrigerant listed below which has the lowest ozone potential

R-134a

An example of an HCFC refrigerant is

R-22

Which of the following is a high pressure refrigerant under EPA's refrigerant recycling regulations

R-22

Which refrigerant contains an HCFC

R-22

An example of a HFC refrigerant is:

R-410A

An example of an HFC refrigerant is:

R-410A

Which refrigerant contains a CFC

R-500

What is the component directly following the condenser in a refrigeration system using a thermal expansion valve

Receiver

__________ is the process that returns refrigerant to new product specifications and that requires chemical analysis

Reclaim

To process refrigerant to a level equal to new (virgin) product specifications as determined by chemical analysis defines

Reclaiming

The EPA requires the installation of a service aperture or process stub on all appliances is in a class 1 or class 2 substance as a refrigerant. The main purpose of this requirement is to make it easier to

Recovered refrigerant

__________ is the process of removing refrigerant in any condition from a system and storing it in an external container without necessarily testing or processing it in anyway

Recovering

What is the term for removing refrigerant in any condition from a system and storing it in an external container without necessarily testing or processing it in anyway

Recovery

After 1995 any supplies of CFC refrigerant to service existing units in the USA can only come from

Recovery and recycling

On a typical three port/3 hose manifold gauge the center port is used for

Recovery evacuation and charging

Clean refrigerant for reuse by separating the oil from the refrigerant and removing moisture from the refrigerant by passing it through one or more filter driers the definition of

Recycle

Manifold gauge sets are often color-coded when this is done the high pressure gauge is color-coded:

Red

In a vapor compressor refrigeration system cooling occurs when:

Refrigerant liquid turns to a vapor

What characteristic(s) of CFCs make them more likely to reach the stratosphere than most other compounds containing chlorine

Refrigerant that contain chlorine but not hydrogen are so stable that they do not break down in the lower atmosphere after being released. The chlorine or bromine reacts with Ozone causing it to change back to oxygen, thus destroying the ozone layer

Which type of refrigerant is the most harmful to stratospheric ozone

Refrigerants containing bromine

Which of the following refrigerant releases is a violation of the EPA Prohibition on venting

Release of mixtures of nitrogen and refrigerant that result from adding nitrogen to a fully charged appliance to "leak-check" the appliance

Which of the following refrigerant releases is considered a violation of the prohibition on venting

Release of mixtures of nitrogen and refrigerant that result from adding nitrogen to a fully charged appliance to leak test the appliance

If corrosion is found within the body of a relief valve the valve must be

Replaced

When corrosion is found within the body of a relief valve the valve must be

Replaced

The EPA can require a technician to demonstrate their ability to perform proper procedures for recovering and recycling refrigerant. Failure to demonstrate competency can result in

Revocation of the technician's certification

Refrigerant recovery during low ambient temperatures will

Slow the recovery process

Which of the following gases help form the earth's protective shield

Stratospheric ozone

Refrigerant entering the compressor of a refrigeration system is a

Superheated vapor

Recovery equipment that relies upon the pressure of the refrigerant in the appliance would be considered

System dependent

When a system will not hold the vacuum after has been evacuated then

System may be leaking

Recovery equipment that relies upon the compressor in the system would be considered:

System-dependent

What is the service procedure if the refrigerant in a recovery cylinder is suspected to be contaminated

Take a pressure reading of the cylinder

The term used to describe the fact that a refrigerant blend has a range of boiling or condensing points at a constant pressure is

Temperature glide

What does ozone depletion potential or ODP measure

The ability of a substance to destroy ozone in the stratosphere

Which of the following factors affect the speed of system dehydration

The ambient temperature and the amount of moisture in the system

To determine the maximum allowable pressure to use when checking a system check:

The design pressure on the equipment nameplate

Never overfill refrigerant storage cylinders because:

The internal pressure of the cylinder may rise in heated areas and cause an explosion

The size/capacity of the vacuum pump and the size of the suction line used will determine

The length of the dehydration time

R-134a has

The lowest ozone depletion potential

It is important not to mix R-22 and R-410a refrigerants in the same container because:

The mixture may be impossible to reclaim

It is important not to mix different refrigerants in the same container because:

The mixture may be impossible to reclaim

Refrigerant that is recovered can be returned to

The same system or other systems owned by the same person without restriction

According to the EPA an oil sample should be taken for which of the following reasons

The system had a leak or a major component failure

Measuring the systems final vacuum is always done with

The system isolated and the vacuum pump off

A system is considered dehydrated when

The vacuum indicator shows you have reached and held the required finished vacuum

Whenever dry nitrogen from a portable cylinder is connected to a system what item is of most importance in consideration of safety

There is a relief valve in the downstream line from the pressure regulator

According to the EPA, of the refrigerant listed below which types of refrigerant will not contribute to global warming

They all contribute to global warming-CFCs, HCFCs, HFC's

Why are some hydroflouroolefin(HFO) refrigerant classified as a "A2L"

They are less flammable than hydrocarbon refrigerants but most are still mildly flammable

Which of the following best describes low loss fittings on refrigerant recovery devices used to recover CFCs, HCFCs, and HFCs

They can be either manually closed or automatically closed when disconnected to prevent loss of refrigerant from hoses

Refrigerant vapors or mess should not be inhaled because:

They may cause heart irregularities and/or unconsciousness

Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFC) have which of the following in common

They must be recovered before opening or disposing of appliances

Which of the following statements about "self contained" recovery devices is true

They remove refrigerant from an appliance without the assistance of components in the appliance

A ternary refrigerant blend is a____________ part mixture

Three-part

What is the best use for testing with soap bubbles

To pinpoint refrigerant leaks

The ozone layer protects the earth from:

Ultraviolet radiation from the sun

How should refrigerant cylinders be positioned when they are shipped

Upright

How would you remove moisture from refrigerant in a system

Use a filter drier

Which of the following safety precautions should be adhered to for low pressure systems

Use gloves and safety goggles when working with liquid refrigerant

Refrigerant migrates to the compressor crank case because of a difference in _________ between the refrigerant and the oil

Vapor pressure

Disposable refrigerant containers are used for ______ refrigerant

Virgin

Which of the following are recommended safe work practices when recovering refrigerants

Wear safety eyewear and butyl-lined gloves when connecting/disconnecting hoses

Never use oxygen or compressed air to pressurize the system because

When mixed with compressor oil or some refrigerant it could explode

HFCs

Will not damage stratospheric ozone but have a high GWP

The chlorine in CFCs and HCFCs

Will not dissolve in water

In what state should a system be to measure a final system vacuum

With the system isolated and the vacuum pump turned off

Technicians receiving a passing grade on the type two: (medium-pressure, high-pressure and very high pressure) exam are certified to recover refrigerant during the maintenance, service or repair of medium and high pressure equipment and very high pressure refrigerant including:

With type two certification you are certified for all very high pressure refrigerants including CFC-13 and CFC-503

Equipment covered by EPA regulations include:

all air-conditioning and refrigeration equipment using CFC, HCFC or HFC refrigerants.

CFC refrigerant are so named because they contain the elements:

chlorine fluorine and carbon

The evacuation of a system is a method of

dehydration

When evacuating the system the hoses should be

equal to or larger than the vacuum pump inlet connection

HCFC refrigerants contain:

hydrogen chlorine fluorine carbon

Before beginning a refrigerant recovery procedure it is always necessary to

know the type of refrigerant that is in the system

Refrigerant that enters the expansion or throttling device also known as the metering device is a

liquid

All devices used for refrigerant recovery must:

meet EPA standards

If an oil is hygroscopic it means that it:

readily absorbs oil

A system is dehydrated to:

remove water and water vapor

A hermetic compressor must never be operated when:

there is a dehydration vacuum in the system

Containers designated "refillable" by DOT are used for transporting recovered pressurized refrigerant

to meet safety requirements

Which chemicals are controlled by the Montreal protocol

All of the above - chlorofluorocarbons and hydrochlorofluorocarbons and halons

Long hoses between the unit and the recovery machine should not be used because they cause:

All of the above - excessive pressure drop increased recovery time and increased emissions

Of the items listed below which is and are violations of the clean air act

All of the above - falsifying or failing to keep required records and failing to reach required a evacuation levels before opening or disposing of appliances and knowingly releasing CFC or HCFC refrigerant or their substitutes while repairing appliances

What effects can ozone depletion have on the environment

All of the above - reduced crop yields and reduced marine life and increased ground level ozone

which of the following statements would be considered good service practices for conserving refrigerant

All of the above -recover recycle refrigerant and keep systems tight and find and repair leaks

Manifold gauge sets are often color coded, when this is done, the low pressure gauge is color coded:

Blue

State and local governments can make state laws that

Both A and B- follow the clean air act/EPA regulations and contain stricter regulations then those acts


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