MACS 609 CERTIFICATION EXAM QUESTIONS AND ANSWERS
(VERIFIED ANSWERS) (LATEST UPDATE 2025) UPDATE!!
If the mechanic's gauges rise Additional recovery
from a vacuum to pressure, what
is required?
What is the only way to fully clear Replacing the desiccant
moisture from the A/C system?
Pressure the boiling point Raises
Vacuum the boiling point Lowers
What should you do when Make sure you have the correct type/size of tubing
replacing hoses?
What does GWP stand for? Global Warming Potential
CO2 is equal to what A/C system? R-744
HFO-1234yf systems are Passenger cars, light-duty trucks, medium-duty passenger vehicles,
acceptable in what kinds of heavy-duty pickup trucks, and complete heavy-duty vans
vehicles?
HFO-1234yf systems are not Heavy-duty trucks, refrigerated transport, and off-road vehicles
acceptable in what kinds of such as farm equipment
vehicles?
HFO-1234yf is classified by A2L- mildly flammable
ASHRAE as what?
R-744 systems operate at ___ to ___ 5 to 10
times higher than HFC-134a and
HFC-152a systems.
HFC-152a is ___ flammable
What are the 2 types of HFC-152a Direct expansion and secondary loop type
systems?
, Refrigerant directly expands within the evaporator that is located
Direct Expansion
inside the passenger compartment
A circulating non-flammable fluid replaces the evaporator which
Secondary Loop (Open Loop)
provides isolation between the flammable refrigerant and the
passenger compartment
Section 609 of the Clean Air Act Establish standards and requirements regarding the servicing of mobile A/C
gives the EPA authority to do systems
what?
What/who establishes standards Section 609 of the Clean Air Act
specifically for the service of
motor vehicle air conditioning
systems (MVAC's)?
How many categories of the 4 types
Section 608 Certification are
there?
What are the 4 categories of 1.) Small Appliances, 2.) High Pressure Appliances, 3.) Low Pressure
Section 608 of the Clean Air Appliances, and
4.) All Appliances except MVACs
Act?
What type of Section 608 is Type 2
Section 609 similar too?
Busses and other vehicles using High Pressure Vehicles under Section 608 type 2
HCFC-22 are not considered
MVACs. What are the
classified as?
DIY jobs are not required to be Proper equipment
certified, but what are they
required to use?
Who is the owner of The EPA
recovery/recycling equipment
required to inform?
Who is responsible for keeping The shop owner
the certification on file?
How long should records be kept? 3 years
Before it can be reused, what It needs to be recycled through the use of a recovery/recycling machine
should the happen to the
refrigerant?
How should DOT approved "DOT 4BA" or "DOT 4BW"
(VERIFIED ANSWERS) (LATEST UPDATE 2025) UPDATE!!
If the mechanic's gauges rise Additional recovery
from a vacuum to pressure, what
is required?
What is the only way to fully clear Replacing the desiccant
moisture from the A/C system?
Pressure the boiling point Raises
Vacuum the boiling point Lowers
What should you do when Make sure you have the correct type/size of tubing
replacing hoses?
What does GWP stand for? Global Warming Potential
CO2 is equal to what A/C system? R-744
HFO-1234yf systems are Passenger cars, light-duty trucks, medium-duty passenger vehicles,
acceptable in what kinds of heavy-duty pickup trucks, and complete heavy-duty vans
vehicles?
HFO-1234yf systems are not Heavy-duty trucks, refrigerated transport, and off-road vehicles
acceptable in what kinds of such as farm equipment
vehicles?
HFO-1234yf is classified by A2L- mildly flammable
ASHRAE as what?
R-744 systems operate at ___ to ___ 5 to 10
times higher than HFC-134a and
HFC-152a systems.
HFC-152a is ___ flammable
What are the 2 types of HFC-152a Direct expansion and secondary loop type
systems?
, Refrigerant directly expands within the evaporator that is located
Direct Expansion
inside the passenger compartment
A circulating non-flammable fluid replaces the evaporator which
Secondary Loop (Open Loop)
provides isolation between the flammable refrigerant and the
passenger compartment
Section 609 of the Clean Air Act Establish standards and requirements regarding the servicing of mobile A/C
gives the EPA authority to do systems
what?
What/who establishes standards Section 609 of the Clean Air Act
specifically for the service of
motor vehicle air conditioning
systems (MVAC's)?
How many categories of the 4 types
Section 608 Certification are
there?
What are the 4 categories of 1.) Small Appliances, 2.) High Pressure Appliances, 3.) Low Pressure
Section 608 of the Clean Air Appliances, and
4.) All Appliances except MVACs
Act?
What type of Section 608 is Type 2
Section 609 similar too?
Busses and other vehicles using High Pressure Vehicles under Section 608 type 2
HCFC-22 are not considered
MVACs. What are the
classified as?
DIY jobs are not required to be Proper equipment
certified, but what are they
required to use?
Who is the owner of The EPA
recovery/recycling equipment
required to inform?
Who is responsible for keeping The shop owner
the certification on file?
How long should records be kept? 3 years
Before it can be reused, what It needs to be recycled through the use of a recovery/recycling machine
should the happen to the
refrigerant?
How should DOT approved "DOT 4BA" or "DOT 4BW"
