Core section vocabulary and regulations required of every EPA Section 608 technician regardless of specialty type.
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- What does EPA Section 608 require?
- Certification for technicians who maintain, service, repair, or dispose of air-conditioning and refrigeration equipment containing more than 5 pounds of refrigerant.
- What is Global Warming Potential (GWP)?
- A measure of how much a refrigerant contributes to global warming relative to carbon dioxide over a 100-year period.
- What is Ozone Depletion Potential (ODP)?
- A measure of a refrigerant's ability to destroy stratospheric ozone, with CFC-12 set as the reference at 1.0.
- Define 'major repair' under EPA Section 608.
- A repair involving more than 25 percent of the refrigerant charge or replacement of a compressor, condenser, or evaporator coil.
- What is the required evacuation level for a system with no air or moisture contamination?
- 500 microns (0.5 millitorr) of absolute pressure.
- What vacuum level is required for systems with air or moisture contamination?
- 10 microns (0.01 millitorr) of absolute pressure.
- What is the zero-leak standard for EPA 608?
- No detectable leaks as determined by an EPA-approved leak detection method.
- Name three EPA-approved leak detection methods.
- Electronic detector, dye and ultraviolet light, soap and water, nitrogen pressure testing, or mass balance calculation.
- When must a technician conduct a leak inspection under EPA 608?
- Within 30 days of startup for newly installed systems or after every major repair.
- What is saturation temperature?
- The temperature at which a refrigerant boils or condenses at a given pressure, read directly from pressure-temperature charts.
- What is superheat?
- The temperature rise of a refrigerant vapor above its saturation temperature at a given pressure.
- What is subcooling?
- The temperature drop of a refrigerant liquid below its saturation temperature at a given pressure.
- What is floodback in a refrigeration system?
- The return of liquid refrigerant to the compressor, which can cause compressor slugging and mechanical damage.
- What is the purpose of an accumulator?
- To prevent floodback by storing excess liquid refrigerant and ensuring only vapor enters the compressor during operation.
- What is a thermostatic expansion valve (TXV)?
- A metering device that automatically regulates refrigerant flow into the evaporator based on superheat.
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