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