A system is considered dehydrated when
the vacuum indicator shows you have reached and held the required finished vacuum
Removing refrigerants from a system and storing it in an external container without testing it or processing it in any way is an example of? *
recovering
Before you can dispose of any appliance containing CFC or HCFC refrigerants you must? *
recover the refrigerant
How should refrigerant cylinders be positioned when they are shipped? *
upright
HCFC refrigerants are... *
as harmful to the ozone as CFC's
If a system will not hold a vacuum after its been evacuated then ? *
the system may be leaking
Why shouldn't technicians used oxygen or compressed air to pressurize appliances to check for leaks? *
when mixed with compressor oil or some refrigerants, either oxygen or compressed air can cause an explosion
How many molecules are in an ozone atom and what are they? *
molecules containing 3 oxygen atoms
Which of the following is an approved drop in replacement for R-12? *
HFC-134a
Blended refrigerants leak from a system... *
at uneven rates due to different vapor pressures
Each Chlorine atom in the stratosphere can destroy ___ ozone molecules? *
100,000
Which oil is commonly used in an HFC-134a refrigeration system? *
esters
CFCs and HCFCs have what in common? *
they must be recovered before disposing of the appliance they are in
The term used to describe the fact that a refrigerant blend has a range of boiling points or condensing points at a constant pressure is... *
temperature glide
The hose connection to the vacuum pump should be? *
as short in length and as large in diameter as possible
What effects can ozone depletion have on the environment? *
- increased ground level ozone
- reduced crop yields
- reduced marine life
What can happen to technicians that violate the Clean Air Act Provision? *
- may be fined
- loose certification
- may be required to appear in Federal Court
Which atom of a CFC molecule causes ozone depletion? *
chlorine
Long hoses between the unit and the recovery machine should be avoided because they? *
longer recovery time
Refrigerant entering the compressor of a refrigeration system is in what state? *
low pressure low temperature superheated vapor
What characteristics of CFC refrigerants make them more likely to reach the stratosphere than most other compounds containing chlorine? *
CFC's are stored under pressure, causing them to jet upward when released
All devices for refrigerant recovery must... *
meet EPA standards
State and local governments may establish laws related to the EPA that are? *
- follow the clean air act and EPA regulations
- contain stricter regulations than the clean air act or EPA regulations
How much money can one be awarded for turning in a technician who is intentionally venting refrigerants? *
$10,000
Which compounds have the highest ODP? *
CFC's