EPA SECTION 608 CORE Exam |Questions with
100% Verified Answers
HFO what are they mainly classified as? - ✔️✔️A2L contins fluorine making them less flammable
they are miscible in POE lubricants
which refrigerants are used in chillers - ✔️✔️R1234 yf
HC refrigerants are an elementary compound and are they most dangerous to environment to
least - ✔️✔️Least amount of danger to environment because no OZONE DEPLETION and very
small effect on Global warming, HWP less than 10
Propane cylinders for grilling should never be used as a refrigernt they CONTAIN WHAT? -
✔️✔️CONTAIN IMPURITIES which can damage refrigeration equipment
Temperature glide - ✔️✔️is the difference between the vapor and liquid state during evaporation
or condensation at a constant pressure
Bubble point - ✔️✔️(liquid)the point at which the zoetrope first begins to boil
Values are used when charging by condenser subcooling
Dew point - ✔️✔️(vapor)temp at which zoetrope first begins to condense is called what
Values are used for charging by suction or evaporator superheat
R400 series of refrigerants are Near azeotropic blends what happens to them? - ✔️✔️Can leak
from a system at uneven rates due to a different vapor pressures which can affect the
percentage of each refrigerant remaining in the system
, The proper charging method for 400 series blended refrigerans is to do what? - ✔️✔️Weigh the
refrigerant into the high side of the system as a liquid, when adding refrigerant to an
undercharged system liquid refrigerant is throttled into the low side with the system operating
Fractionation - ✔️✔️separates into individual component
when there is concern of using blended refrigerants in systems that develop a leak, there may
be fractioinization or leaking
Can refrigerants be interchanged? - ✔️✔️No, they cannot be interchanged even though they may
have the same or close to the same operating characteristics
Due to flammability of some of HC and HFO, does equipment need to be able to handle
refrigerant, - ✔️✔️YES, EPA regulates the max amount of refrigerant that can be used in the new
system by their type and use.
When retrofitting or converting a system to use a different refrigerant what can be used? -
✔️✔️ONLY EPA approved substitutes
What doesn't EPA approve when choosing refrigerants for as direct drop in replacements -
✔️✔️THEY do not approve any direct drip in replacements
LOW pressure - ✔️✔️refrigerants have a pressire of 30 PSI or lower at a liquid phase temp of 104
f
MEDIUM pressure - ✔️✔️refrigerants have pressure between 30-155 psi at a liquid phase temp
of 104
HIGH pressure - ✔️✔️Refrigerants have a pressure between 155 psi and 340 psi at a liquid phase
temp of 104
100% Verified Answers
HFO what are they mainly classified as? - ✔️✔️A2L contins fluorine making them less flammable
they are miscible in POE lubricants
which refrigerants are used in chillers - ✔️✔️R1234 yf
HC refrigerants are an elementary compound and are they most dangerous to environment to
least - ✔️✔️Least amount of danger to environment because no OZONE DEPLETION and very
small effect on Global warming, HWP less than 10
Propane cylinders for grilling should never be used as a refrigernt they CONTAIN WHAT? -
✔️✔️CONTAIN IMPURITIES which can damage refrigeration equipment
Temperature glide - ✔️✔️is the difference between the vapor and liquid state during evaporation
or condensation at a constant pressure
Bubble point - ✔️✔️(liquid)the point at which the zoetrope first begins to boil
Values are used when charging by condenser subcooling
Dew point - ✔️✔️(vapor)temp at which zoetrope first begins to condense is called what
Values are used for charging by suction or evaporator superheat
R400 series of refrigerants are Near azeotropic blends what happens to them? - ✔️✔️Can leak
from a system at uneven rates due to a different vapor pressures which can affect the
percentage of each refrigerant remaining in the system
, The proper charging method for 400 series blended refrigerans is to do what? - ✔️✔️Weigh the
refrigerant into the high side of the system as a liquid, when adding refrigerant to an
undercharged system liquid refrigerant is throttled into the low side with the system operating
Fractionation - ✔️✔️separates into individual component
when there is concern of using blended refrigerants in systems that develop a leak, there may
be fractioinization or leaking
Can refrigerants be interchanged? - ✔️✔️No, they cannot be interchanged even though they may
have the same or close to the same operating characteristics
Due to flammability of some of HC and HFO, does equipment need to be able to handle
refrigerant, - ✔️✔️YES, EPA regulates the max amount of refrigerant that can be used in the new
system by their type and use.
When retrofitting or converting a system to use a different refrigerant what can be used? -
✔️✔️ONLY EPA approved substitutes
What doesn't EPA approve when choosing refrigerants for as direct drop in replacements -
✔️✔️THEY do not approve any direct drip in replacements
LOW pressure - ✔️✔️refrigerants have a pressire of 30 PSI or lower at a liquid phase temp of 104
f
MEDIUM pressure - ✔️✔️refrigerants have pressure between 30-155 psi at a liquid phase temp
of 104
HIGH pressure - ✔️✔️Refrigerants have a pressure between 155 psi and 340 psi at a liquid phase
temp of 104
