EPA 608 core
before shipping any used refrigerant cylinders, check that the cylinder meets what standards?
(DOT) Department of transportation
to scrap a disposable cylinder, the internal cylinder pressure must be reduced to at least;
0 PSIG
an ozone molecule contains;
3 oxygen atoms
when an HFC sys. with POE has been opened for a major repair, what is the minimum evac level that should be achieved before re-charging the system?
500 microns minimum.
a mixture of refrigerant that acts like a single component refrigerant over its entire temp range can be described as a:
Azeotropic refrigerant mixture
what type of refrigerant has the highest ozone depletion potential (ODP)?
CFC's
R-124 is what type of refrigerant?
HCFC (Hydrochlorofluorocarbon)
what type of refrigerant contains no chlorine?
HFC's
before beginning a refrigerant recovery procedure it is always necessary to:
Know the type of refrigerant in the system
what is the component directly following the condenser in a refrigeration sys. utilizing a TXV?
Receiver
what is the term for removing refrigerant in any condition from a system and storing it in an external container?
Recovery
manifold guage sets are often color coded, the high pressure gauge and hose are color code;
Red
which of the following refrigerant releases is considered a violation of the prohibition on venting?
Release of mixtures of of nitrogen and refrigerant that result from adding nitrogen to a fully charged appliance to leak check the appliance.
what is the best method to pinpoint refrigerant leaks?
Soapy water, bubbling indicates a leak.
what is the service procedure if the refrigerant in a recovery cylinder is suspected to be contaminated?
Take a pressure reading of the cylinder. (compare cylinder sat temp with pt chart)
the compressor;
changes low pressure vapor into a high pressure vapor
Crop loss, eye disease, and skin cancer have been attributed to;
depletion of stratospheric ozone
a refrigerant cylinder designed to hold recovered refrigerant has a;
gray body and yellow top
refrigerant cannot be called reclaimed unless it;
has been chemically analyzed and the refrigerant meets the ARI-700 purity standard
technicians who violate the clean air act can;
lose their EPA certification, be fined, be required to appear in federal court.
what is the state of the refrigerant right before it enters the compressor?
low pressure vapor
what must be done before disposing of any appliance containing CFC, HCFC, or HFC refrigerant?
recover the refrigerant
CFC's and HCFC's must be:
recovered before disposing of any appliances
After 1995, any supplies of CFC refrigerant to service existing units in the USA can only come from:
recovery and recycling
what characteristics of CFC's make them more likely to reach the stratosphere than most other compounds containing chlorine?
refrigerants that contain chlorine but not hydrogen are incredibly stable that they dont break down in the atmosphere. the chlorine and bromine react with the ozone and change it to oxygen, thus breaking down the ozone layer.
the EPA can require a technician to demonstrate their ability to perform proper procedures for recovering and/or recycling refrigerants. failure to demonstrate competency can result in;
revocation of the technicians certification
refrigerant that is recovered can be returned to;
the same system or another system by the same tech without restriction
a system is considered dehydrated when:
the vacuum indicator shows that you have reached and held the required finished vacuum
in what state should a system be to measure a final system vacuum
vacuum pump off, system isolated.
Disposable refrigerant containers are used for ______ refrigerent
virgin
