Epa 608 stuvia Study guides, Class notes & Summaries

Are there drop-in replacements for R-12 systems? Why or why not? - ANSWERNo because the new refrigerants are incompatible with the oils and lubricants used in R-12 systems. What type of oil is used in R-134a and what oils will it mix with? - ANSWEREster based oils and they do not mix with other oils What type of lubricant is used with HCFCs? - ANSWERAlkylbenzene lubricant What is difference b/w ternary blend a azeotropic blend? - ANSWERTernary blends are three-part mixtures whereas azeo...

What are the typical uses of the center port of gauge set? - ANSWERSUsed during evacuation, charging and recovery procedures. What color are the gauges on a manifold gauge set? - ANSWERSLow pressure is blue, High pressure is red. What are the typical ranges of pressure measurements used on the gauges of a manifold gauge set? - ANSWERSHigh side is 0 to 500 PSIG; Low side is 0 to 350 PSIG and 0 to 30 in. Hg below atmospheric pressure. Is the refrigerant leaving a condenser at a high or lo...

When using recovery or recycling equipment manufactured or imported on or after Nov 15, 1993, the required level of evacuation for low pressure equipment is _____ Hg absolute: 30mm 25mm 15mm 20mm - ANSWER 25mm The EPA requires that all commercial and industrial process refrigeration systems with more than 50lb of refrigerant be repaired when the annual leak rate exceeds ______: 35% 15% 30% 25% - ANSWER 35% Open-drive compressors are typically _____ compressors centrifugal r...

technicians maintaining, servicing, repairing, or disposing of low-pressure appliances must be certified as: - ANSWER Type III or Universal Technician the owner &/or operator of the equipment is responsible for keeping: - ANSWER records including: leak inspections & any completed leak repair verification tests it's the _______ &/or ___________ responsibility to obtain service records from the servicing company doing any work on an appliancem - ANSWER owner &/ or operator as of 11/14/94...

What do R-11 and R-123 refrigerants have in common? A. They are oxygen depleting B. They are Class I and II substances as defined by the EPA C. Both A and B D. Neither A nor B - ANSWER C. Both A and B What is the required evacuation level for recovering refrigerant from a low-pressure appliance with a recovery machine manufactured before November 15, 1993? A. 0 psig B. 4" Hg C. 10 A Hg D. 25" Hg - ANSWER D. 25" Hg How is frost best removed from a sight glass? A. reverse ...

Identify the pressure corresponding to 32 degrees F for R-123: ________. a) 23 inches of Hg vacuum b) 20 inches of Hg vacuum c) 17 inches of Hg vacuum d) 11 inches of Hg vacuum - ANSWER b) 20 inches of Hg vacuum A hydrostatic tube test kit is used to: _________. a) blow all water from the tubes b) remove any water from the machine c) vent refrigerant d) determine if a tube leaks - ANSWER d) determine if a tube leaks Excessive running of a purge system on a low pressure chiller ...

Refrigeration technicians who violate the Clean Air Act can: - - ANSWERSLose their EPA certification, be fined, be required to appear in Federal court. After 1995, any supplies of CFC refrigerants to service existing units in the USA can only come from: - - ANSWERSrecovery and recycling. Refrigerant that is recovered can be returned to: - - ANSWERSthe same system or other systems owned by the same person without restriction. Refrigerant can not be called "reclaimed" unless it: - . - A...

Are there drop-in replacements for R-12 systems? Why or why not? - ANSWERSNo because the new refrigerants are incompatible with the oils and lubricants used in R-12 systems. What type of oil is used in R-134a and what oils will it mix with? - ANSWERSEster based oils and they do not mix with other oils What type of lubricant is used with HCFCs? - ANSWERSAlkylbenzene lubricant What is difference b/w ternary blend a azeotropic blend? - ANSWERSTernary blends are three-part mixtures whereas ...

On low-pressure chillers, moisture most frequently enters the system through; a. air leaks in the rupture disc assembly. b. tube leaks in the evaporator. c. leaks from areas with gaskets or fittings. d. leaks from the charging service valve. - ANSWER c. leaks from areas with gaskets or fittings. What precaution should be taken prior to recovering refrigerant from a chiller suspected of having tube leaks? a. Drain the water sides of the evaporator and continue. b. Run the circulating pum...

What date was the sale of CFC's & HCFC's restricted to technicians certified in refrigerant recovery? - ANSWER November 14, 1994 Section 608 of the Federal Clean Air Act requires technicians to what? - ANSWER Recover all refrigerants. The objective of the Clean Air Act is to protect what? - ANSWER The earth's stratosphere. HFC's - ANSWER HydroFlouroCarbon's CFC's - ANSWER ChloroFluoroCarbon's ODP - ANSWER Ozone Depletion Potential Which international treaty agreement was...