If the mechanic's gauges rise from a vacuum to pressure, what is required? - Additional recovery
What is the only way to fully clear moisture from the A/C system? - Replacing the desiccant
Pressure ______ the boiling point - Raises
Vacuum _______ the boiling point - Lowers
What should you do when replacing hoses? - Make sure you have the correct type/size of tubing
What does GWP stand for? - Global Warming Potential
CO2 is equal to what A/C system? - R-744
HFO-1234yf systems are acceptable in what kinds of vehicles? - Passenger cars, light-duty trucks,
medium-duty passenger vehicles, heavy-duty pickup trucks, and complete heavy-duty vans
HFO-1234yf systems are not acceptable in what kinds of vehicles? - Heavy-duty trucks, refrigerated
transport, and off-road vehicles such as farm equipment
HFO-1234yf is classified by ASHRAE as what? - A2L- mildly flammable
R-744 systems operate at ___ to ___ times higher than HFC-134a and HFC-152a systems. - 5 to 10
HFC-152a is ___ - flammable
What are the 2 types of HFC-152a systems? - Direct expansion and secondary loop type
, Direct Expansion - Refrigerant directly expands within the evaporator that is located inside the
passenger compartment
Secondary Loop (Open Loop) - A circulating non-flammable fluid replaces the evaporator which provides
isolation between the flammable refrigerant and the passenger compartment
Section 609 of the Clean Air Act gives the EPA authority to do what? - Establish standards and
requirements regarding the servicing of mobile A/C systems
What/who establishes standards specifically for the service of motor vehicle air conditioning systems
(MVAC's)? - Section 609 of the Clean Air Act
How many categories of the Section 608 Certification are there? - 4 types
What are the 4 categories of Section 608 of the Clean Air Act? - 1.) Small Appliances, 2.) High Pressure
Appliances, 3.) Low Pressure Appliances, and 4.) All Appliances except MVACs
What type of Section 608 is Section 609 similar too? - Type 2
Busses and other vehicles using HCFC-22 are not considered MVACs. What are the classified as? - High
Pressure Vehicles under Section 608 type 2
DIY jobs are not required to be certified, but what are they required to use? - Proper equipment
Who is the owner of recovery/recycling equipment required to inform? - The EPA
Who is responsible for keeping the certification on file? - The shop owner
How long should records be kept? - 3 years
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