Hvac Core

The molecule found in CFCS and HCFCS that depletes ozone is;

Chlorine

Which safety precautions should always be followed

Never apply an open flame to a refrigerant cylinder. Never cut or weld any refrigerant line when refrigerant is in the line. Never use oxygen to purge lines or to pressurize a system.

A single chlorine atom can destroy how many ozone molecules?

100,000

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

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

5 years

It is necessary to place a refrigerant label on

A refrigerant cylinder which is being returned for reclaiming

Which ASHRAE classification means slightly flammable?

A2L

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

Acid will form

Which of the following has the highest Ozone Depletion Potential?

CFCs

The compressor

Change is a low pressure vapor to a high pressure vapor

The condenser

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

When using nitrogen to pressurize the system you should always

Charge through a pressure regulator

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 recycled the metal is the proper disposal method for;

Disposable cylinders

What is the significant new alternatives policy (SNAP) Program?

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

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

Final person in the disposal chain

Refrigerant cylinders should always be:

Free of rust and damage, color coded to indicate contents and secure

A refrigerant cylinder designed to hold recovered refrigerant has a;

Gray body and yellow top

Which type of refrigerant contains no chlorine?

HFCs

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

HFOs

HCFCs contain

Hydrogen, Chlorine, Fluorine, and Carbon

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

Leak testing

Which international agreement (treaty) regulated the production and use of CFC's HCFC's halons, methyl chloroform and carbon tetrachloride;

Montreal Protocol

Which is the following refrigerants is an HFO?

R-1234ze

Which of the following refrigerants has a GWP closest to 1?

R-1234ze

An example of an HFC refrigerant is

R-410A

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

Reclaiming

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

Recovering

On a typical three port manifold gauge the Centerport 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 dryers is the definition of

Recycle

Which type of refrigerant is the most harmful to stratospheric ozone

Refrigerants containing Chlorine

Hey system is dehydrated to

Remove water and water vapor

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

The length of dehydration time

Measuring the systems final vacuum is always done with

The system isolated and the vacuum pump off

A ozone molecule contains;

Three oxygens atoms

HFCs

Will not damage stratospheric ozone but have high GWP.

The chlorine in CFCs and HCFCs

Will not dissolve in water

Which gas(es) would cause the LEAST damage to the environment during a leak check?

dry nitrogen

When dehydrating a system the system can be heated to

decrease the dehydration time.

The evacuation of a system is a method of

dehydration

When evacuating a system the hoses should be

equal to or larger than the vacuum pump inlet connection

Non-Azeotropic refrigerants leak from a system

in uneven amounts due to different vapor pressures

Never use an open flame to heat a refrigerant tank because

it can result in venting refrigerant to the atmosphere. the tank may explode, causing serious injury to people nearby. refrigerant in the tank may decompose, forming a toxic material

Refrigerant recovery during low ambient temperatures will

slow the recovery process

Never overfill refrigerant storage cylinders because:

the internal pressure of the cylinders may rise in heated areas and cause an explosion.

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

the system may be leaking

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

When transporting cylinders containing used refrigerant the DOT requires that you

attach DOT classification tags