CORE
Due to their impact on the environment, most refrigerants are now regulated by either the ____________________________, ____________________, or both.
What is EPA, state laws
n air conditioning applications, the industry standard for airflow across the evaporator is _____ cubic feet per minute (CFM), per ton of cooling.
what is 400 cfm
With proper ventilation on a jobsite or work area, flammable refrigerants can be kept below their ______________________________ should a leak occur.
What is `lower flammability limit`
A2L systems are designed with electrical components that are
What is `intrinsically safe (IS).`
Refrigerants that have a lower-case letter designation indicate
What is an isomer.
Most compressors require _________________ to operate properly, which is specified by the manufacturer.
What is `lubrication (oil)`
A(n) ______________________________ designation is used when refrigerant blends are composed of the same refrigerants, but with different percentages of each.
What is uppercase
The_________________________ is the minimum electrical spark energy, in millijoules (mJ), required to ignite a flammable gas/air mixture.
What is `minimum ignition energy (MIE)`
For evacuation, some manufacturers of A2L equipment require that the system be
What is `triple evacuated`
What is destroyed at the owner’s expense.
The two types or classes of metering devices are _________________ and ______________________.
What is fixed and adjustable`
ASHRAE Standard ________ is used to classify a refrigerant according to the potential hazards involved with its use, specifically toxicity and flammability.
What is 34
What is a measurement of the amount of heat released when a substance, in this case, a refrigerant, burns.
What is `Heat of combustion (HOC)`
When charging an A2L system where ventilation mitigation has been installed, the maximum allowable charge cannot exceed the
What is `m2`charge weight.
What is acid.
Additional components that may be installed on the low side of a refrigeration circuit are ____________________ and _____________________.
What is accumulator and suction line drier`
Refrigerants that have a lowercase letter (a, b, c) designation indicate a(n) _____________________.
What is Isomer
When fluorinated refrigerants decompose, they can also form a short-lived gas called
What is `carbonyl fluoride, COF2`
components such as the contactor or capacitor are designed to be enclosed, isolating the electrical contacts from the atmosphere
What is `Intrinsically safe`
Which of the following must be recorded on the label of A2L equipment upon completion of installation?
What is Dates that the pressure test and evacuation were completed.
R-404A has a global warming potential (GWP) of _____________.
What is `3920`
What occurs when one or more of the refrigerants in a blend leak at a faster rate than other refrigerants in the blend.
What is Fractionation
R-1234yf has an MIE of
What is `5,000-10,000`
For A2L-charged systems, the maximum allowable charge is not
What is `a universal figure`
When working with A2L refrigerants: what is not an approved leak detection method?
What is Halide Leak Detector