Type I, Persons who maintain, service, repair, or dispose of small appliances, small appliance, pre-assembled unit, hermetically sealed and factory charged with 5 lbs. or less of refrigerant., Type II., does not include small appliances or motor vehicle air-conditioning (MVAC) systems., Type III., maintain, service, repair, or dispose of low-pressure appliances, such as centrifugal and chillers,, Universal, Persons, who maintain, service, or repair both low and high-pressure equipment, as well as small appliances, An accumulator when used is, located in the suction line, Accumulators prevent any liquid refrigerant that may flow, from the evaporator from flowing into the compressor., A pressure-temperature (PT) chart provides the, pressure-temperature relationship of refrigerants, compressor crankcase heater is used to, help prevent this refrigerant migration., Refrigerant will migrate to a compressor's crankcase and mix with the oil when, difference between the oil pressure and refrigerant vapor pressure., An oil sample should be taken when, unit has had a leak or a major component failure., Refrigerant oil samples are also taken when, moisture, acid, oil sludge formation, oil waxing, or residual acidic oil from a burn-out are suspected problems., Finding and repairing leaks in the system, will conserve refrigerant when servicing an appliance., Flushing field tubing with liquid refrigerant to clean the tubing after a burn-out, is unlawful, After making a major repair in refrigerant service, appliance should be dehydrated by evacuating the system to a minimum of 500 microns., Under no circumstance should a hermetic compressor be operated, when there is a vacuum in the system, gauge manifold set, professional diagnostic and service tool used by HVAC and automotive technicians to measure, monitor, and regulate refrigerant pressures in heating, ventilation, air conditioning, and refrigeration systems, compound pressure gauge measures system pressure for the low side, pounds per square inch gauge (psig) and vacuum in inches of mercury (Hg)., EPA recommends that hoses be equipped with low-loss fittings or valves that manually close, or which close automatically, to, minimize refrigerant loss when hoses are disconnected., Minor releases when connecting or disconnecting hoses for service or recovery are considered, De-Minimis release and is unlawful

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