EPA 608 Core- Mainstream Engineering
All CFC, HCFC, and HFC refrigerant recovery devices must _________________.
meet EPA standards
The capacity of a vacuum pump and its suction line size affect ___________.
moisture removal and evacuation time
Ozone contains ______________.
molecules containing 3 oxygen atoms
All refrigerants _________________.
must be recovered before opening or disposing of appliances
Over-evacuation of a system can ___________________.
never occur; you can never pull too many impurities from a system
Before disposing of any appliance containing refrigerant __________________.
recover the refrigerant
During servicing of any refrigeration system, the refrigerant must be______________.
recovered
After a refrigerant is phased-out, supplies of that refrigerant for equipment servicing can only come from __________________.
recovered and reclaimed gas
A "self-contained" recovery device ________________.
removes refrigerant with the assistance of components in the appliance
If technicians lose their certification card, they must_________________.
request a replacement from the company that provided the certification
Service hoses used for system evacuation _________________.
should be equal to or larger than the pump intake connection for faster evacuation
A ________________ recovery device uses the compressor in the appliance and/or the pressure of the refrigerant in the appliance.
system-dependent
Distributors must verify __________________ before they can sell refrigerant.
that the purchaser employs at least one Section 608 certified technician
When disposing of an appliance with 5-50 pounds of refrigerant, you must record_______________.
the type of refrigerant recovered
The release of any CFC, HCFC, or HFC refrigerant during ______________ is illegal.
theft of equipment
A system is evacuated ___________________.
to dehydrate the system
You heat a system during dehydration ____________________
to raise the vapor pressure of the water in the system and decrease dehydration time
When measuring a vacuum of the system, the vacuum gauge should be connected ________.
to the system as far as possible away from the vacuum pump
When servicing an R-22 system you CANNOT _______.
top off the unit with R-407C
The stratospheric ozone layer protects us from ___________________.
ultraviolet radiation from the sun
Dehydrating means to remove ______________.
water and water vapor
Always measure the final system vacuum __________________.
with the system isolated from the vacuum pump
Why is venting an "exempt refrigerant" legal?
Because the EPA has determined that the refrigerant does not pose a threat to the environment if released
_____________ refrigerants are the most harmful to stratospheric ozone.
CFCs
_____________ refrigerants have the highest ODP.
CFCs
What gas is used as the baseline measurement for GWP?
Carbon dioxide
Which health effect increases from loss of the stratospheric ozone layer?
Cases of cataracts and skin cancer
A reduction in stratospheric ozone causes _______________.
Decreased crop yields and damage to marine organisms
Which appliances are NOT covered by EPA regulations?
Desiccant dehumidifiers
Which gas would cause the least damage when used for leak checking?
Dry nitrogen alone
What is being done in the U.S. to stop damage to the stratospheric ozone layer?
Eliminating the use of CFCs and HCFCs refrigerants
Which is a violation of EPA or Clean Air Act regulations?
Failing to evacuate refrigerant in a leaking system to at least 0 psig
The ability of a substance to destroy ozone in the stratosphere is referred to as ___________________.
ODP (ozone depletion potential)
What action violates the EPA's prohibition on venting?
Opening the system without properly recovering the refrigerant first
What does a Section 608 certification allow a technician to do?
Purchase or handle controlled refrigerants
An example of an HCFC refrigerant is:
R-123
______________ contains chlorine.
R-22
_____________________ refrigerant has an ODP that is greater than 1.
R-22
How should disposable cylinders be discarded?
Recover all remaining refrigerant, render the cylinders useless, and recycle the metal.
Which refrigerant release is allowable by the EPA because the refrigerant is "exempt."
Releasing isobutane from a household freezer
What does NOT require Section 608 certification?
Rewiring a condenser fan
Which of the following is a lawful use of HCFC-22?
Servicing existing R-22 systems
The ___________ identifies alternative refrigerants for use program.
Snap Program
Which of the following gases help form the earth's protective shield?
Stratospheric ozone
How does the GWP of R-410A compare to carbon dioxide?
The GWP of R-410A is thousands of times greater.
How does the GWP of R-441A compare to the GWPs of R-410A?
The GWP of R-441A is significantly lower.
EPA regulations only allow recovered or recycled refrigerant to be _________________.
charged into the same or another appliance owned by the same person
Ozone depletion is caused by ______________ in HCFC refrigerants
chlorine
If a system cannot maintain a vacuum, the system ______________.
could have a leak or still be evaporating off trapped refrigerant or moisture
Reclaimed refrigerant must be tested to meet __________________ before it can be resold.
AHRI 700
Which action is a violation of the prohibition on venting refrigerants?
Adding nitrogen to a fully charged appliance to leak check the appliance and then venting the mixture
The Montreal Protocol is ________________________.
An international treaty that addresses ozone-depleting substances and their alternatives
How much can a technician be fined for venting a non-exempt refrigerant from a system?
$44,539 per day per violation
What are the characteristics of hydrofluoroolefins and hydrocarbon refrigerants?
0 ODP and low GWP
According to the Roland-Molina theory, _________ are destroyed by each chlorine atom in the stratosphere.
100,000 ozone molecules
The production and import of new R-22 in the U.S. to service existing systems is banned beginning in ________.
2020
Ozone depletion in the stratosphere is what type of problem?
Global problem
________________damages stratospheric ozone.
HCFCs
Which of the following proves that HCFCs are in the stratosphere?
HCFCs found in air samples from the stratosphere.
Which type of refrigerant typically has the lowest global warming potential?
HFOs
HCFC refrigerants are made up of ___________________.
Hydrogen, chlorine, fluorine, and carbon
What is one of the most serious results of loss of the stratospheric ozone layer?
Increased rates of skin cancer
Which of the following is illegal?
Knowingly releasing refrigerants during the service, maintenance, repair, or disposal of appliances
What happens when EPA regulations change after a technician is certified?
The technician has a responsibility to keep up with changes in EPA regulations.
What makes HFC refrigerants damaging to the environment?
They can have very high global warming potentials.
A system is considered dehydrated when ________________________.
a micron-gauge shows you have reached and held a vacuum of 500 microns or less with the vacuum pump isolated from the system
EPA regulations require appliances to have ___________.
a service aperture or process stub
Which refrigerant(s) must be recovered __________________
all non-exempt refrigerants
The service hose between the system and the vacuum pump should _______.
be as short as possible
Technicians who violate Clean Air Act provisions __________________.
can lose their certification
State and local governments __________________.
can make laws that are stricter requirements than the federal regulations
What refrigerant servicing does NOT require Section 608 certification?
carbon dioxide refrigerant
CFCs and HCFCs _____________making them capable of reaching the stratospheric ozone layer.
do not dissolve in water or easily break down in the atmosphere
The EPA considers _________________the most effective for locating the general area of a small leak.
electronic or ultrasonic tester
The EPA's "safe disposal requirements" make the __________________ responsible for ensuring that all refrigerant has been removed from household refrigerators before they are disposed.
final person in the disposal chain
