Epa 608 stuvia Study guides, Class notes & Summaries

Which of the following refrigerants has a safety classification of B-1 - ANSWER HCFC-123 (R-123) The EPA-required evacuation level for recovery or recycling equipment used on low-pressure systems is - ANSWER 25 mm of Hg absolute. Which organization establishes the refrigerant safety group standard? - ANSWER ASHRAE Where is the purge unit located in a low-pressure system? - ANSWER The top of the condenser. To repair a chiller operating with R-22, the technician; - ANSWER must ha...

A-1 - ANSWER refrigerants CFC-12, HCFC-22, HFC-134a are all classified as type what substances? 15 hg - ANSWER when recovering refrigerant from a medium pressure system with more than 200lbs of refrigerant, recover to a level of? 30% - ANSWER EPA requires that all industrial process refrigeration systems containing more than 50 lbs of refrigerant MUST be repaired when the annual leak rate excceds? pressurize system using controlled hot water - ANSWER whats the most efficient method of l...

Which of the following best describes the refrigerant recovery process from an R-123 system? - ANSWER Start with liquid removal and then switch over to vapor recovery. Under ASHRAE Standard 34, R-134a is classified as; - ANSWER A1 When charging a low-pressure system, refrigerant should be introduced to the system as a vapor to raise the system's saturation temperature to a minimum of; - ANSWER 36 Degrees In a low-pressure chiller, air and other non-condensables collect at the; - ANSWER...

On low pressure chillers, moisture typically enters the refrigerant system through - ANSWER air leaks from areas with gaskets or fittings The maximum test pressure for leak testing a low pressure centrifugal is: - ANSWER 10 psig Leak test and repair the chiller to reduce refrigerant loss from a pruge unit on CFC-11 chiller - ANSWER ... A hydrostatic tube test kit is used to: - ANSWER determine if a tube leaks Commercial and industrial process refrigeration systems must be repaired wh...

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...

Where do leaks commonly occur in low pressure systems? a. Evaporator b. Condenser c. Purge unit d. Gaskets or fittings - ANSWER d. Gaskets or fittings Where do leaks commonly occur in open-drive type compressor systems? a. Evaporator b. Condenser c. Shaft seal d. Cooling tower - ANSWER c. Shaft seal Does refrigerant go out of the system in low pressure systems or does air and moisture go in? a. Refrigerant escapes through low pressure leaks. b. Air and moisture enter the refrige...

A typical setting for the high pressure cut-out control on a recovery unit used for evacuating the refrigerant from a low pressure chiller is: - ANSWER C) 10 psig. A charged low pressure refrigeration system can be efficiently leak checked by: - ANSWER D) raising system pressure by heating with circulated hot water or heating blankets. The existence of air in a low pressure system, causes __________. - ANSWER C) high head pressure. Which safety precaution should be adhered to for low pr...

Before recovering refrigerant from a chiller suspected of having tube leaks,... - ANSWER ...drain the water sides of the evaporator and condenser. Draining the water sides helps to avoid the introduction of additional water into the system cause by the evacuation process and to prevent the water from freezing as the refrigerant evaporates during recovery. How can you pressurize a low-pressure chiller to make a non-major repair? - ANSWER Warm up the system. Under EPA regulations, you may wa...

Technicians maintaining, servicing, repairing or disposing of low-pressure appliances must be certified as - ANSWER Type III Technician or a Universal Technician. As of November 14, 1994, the sale of CFC and HCFC refrigerants is restricted to - ANSWER Certified technicians, NOTE: If EPA regulations change after the technician is certified, it will be the technician's responsibility to comply with any future changes. Because a low-pressure system operates below atmospheric pressure (in a v...

Techs maintaining, servicing, repairing, or disposing of low pressure appliances must be certified as? - ANSWER Type III or universal technician As of what date was the sale of CFCs and HCFCs restricted to certified techs? - ANSWER Nov 14, 1994 Who is responsible to comply with changes in section 608? - ANSWER The technician Because low pressure systems operate in a vacuum , where will leaks occur? - ANSWER Gaskets or fittings (allow air or moisture into the system? What is the most ...