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MACS Certification question and answers
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MACS Certification question and answers
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MACS Certification question and answersIf 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
, MACS Certification question and answers
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
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