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R410A2032Y EXAM WITH QUESTIONS AND ANSWERS
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R410A2032Y EXAM WITH QUESTIONS AND ANSWERS Molina-Rowland Theory 1974, chlorine and bromine were responsible for depleting the ozone lay er R12 classified as CFC R22 classified as HCFC R22 replaced by R410A What year did phase-out occur for HCFC22 2010 Formula for consumption consumption = production + imports - exports Most damaging HCFC 14 lb, 142b, 22 R410A classified as HFC R410A, R407C, R134a classified as HFC R410A is a binary near azeotropic R22 systems cannot be retrofitted R410A uses what types of oils Polyol Ester (POE) Refrigerant conditions can be saturated, superheat, subcooled Saturation is defined as temperature Saturation occurs in both the evaporator and condenser Compression ratio equation Compression ratio = absolute discharge pressure/ absolute suction pre ssure Absolute pressure equation absolute pressure = gauge pressure + atmospheric pressure R410A pressures are___ than R22 40-70% Moisture in a system causes acid, corrosion, oil breakdown, sludge, carbon build up Liquid line filter dries must be rated no less than 600 psig and be approved for use with R410A Transporting liquid in a liquid line can lose/ gain subcooling depending on surrounding temp True or false: liquid lines used for R22 can be used with R410A if sized a nd cleaned properly true 5 types of metering devices TEV, ATV, Electronic, Capillary tube, fixed orifice Metering device capacities___ as the pressure differences across their orifices ___ increase, increase amount of superheat in evaporator is usually controlled by TXV Function of suction line superheat vapor as it approaches compressorThe benefits of buying summaries with Stuvia:
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