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EPA 608 Certification Refrigerant Recovery and
Transition exam 70 Questions and Answers
What date was the sale of CFC's & HCFC's restricted to technicians certified in refrigerant recovery? - ** November 14, 1994 Section 608 of the Federal Clean Air Act requires technicians to what? - ** Recover all refrigerants. The objective of the Clean Air Act is to protect what? - ** The earth's stratosphere. HFC's - ** HydroFlouroCarbon's CFC's - ** ChloroFluoroCarbon's ODP - ** Ozone Depletion Potential Which international treaty agreement was the basis for Section 608? - ** The Montreal Protocol. Depletion of the ozone in the stratosphere is know to cause what 6 things? - ** 1.Crop losses 2.Increases in eye diseases 3.Skin Cancer 4.Reduced marine life 5.Deforestation 6.Increased ground level ozone
What happens when CFC or HCFC molecules get in the stratosphere & free atoms of Chlorine are set free? - ** These atoms attack Ozone Molecules causing the formation of Chlorine Monoxide (CLO), after colliding with another Ozone Molecule, causes 2 Oxygen (O2) molecules to be made & leaving an atom of chlorine to act as "Free Agent" starting the process over until 100,000 molecules of Ozone are destroyed by just one atom of chloride. What date was recovery equipment required to be certified by a lab, & achieve higher evacuation levels, & have low loss fittings? - ** November 15, 1993 On what date was technician certification required? - ** November 14, 1994 What date was CFC's phased out of production? - ** December 31, 1995 What is EPA 608 Type I certification? - ** Persons who maintain, service, repair, or dispose of small appliances (containing 5 pounds of refrigerant (or less). What is EPA 608 Type II certification? - ** Persons who maintain, service, repair, or dispose of high and very high pressure appliances. Except small appliances and motor vehicle air conditioning systems. What is EPA 608 Type III certification? - ** Persons who maintain, service, repair, or dispose of low pressure appliances. What is EPA 608 Universal certification? - ** Persons who maintain, service, repair, or dispose of both low and high pressure equipment, as well as appliances. HCFC's -
What is the definition of a Type I Appliance? - ** A small appliance that is manufactured, charged, and hermetically sealed in a factory with 5 Lbs. of refrigerant or less. What is the definition of a Type II Appliance? - ** High pressure or very high pressure appliances except for small appliances and motor vehicle air conditioning. Refrigeration systems containing more than 5 Lbs. of high or very high pressure refrigerants. What is the definition of a Type III Appliance? - ** Low pressure equipment like low pressure chillers. All refrigerants are assumed to be a single chemical if they are numbered what? - ** 1-399 and 600 and above. What is an Azeotrope? - ** A mixture of two or more liquids in such a ratio that it's composition cannot be changed by vaporizing it. Azeotrope's are numbered what? - ** 500 to 599 What is fractionation? - ** When the refrigerant leaks, it leaks out in different rates due to the different pressures. What is Temperature Glide? - ** When the temperature of the vaporizing refrigerant changes, even though the pressure remains the same. What are the two basic types of recovery devices? - ** Self-Contained and System-Dependent. System-Dependent devices may only be used on appliances containing how much refrigerant? -
** 15 Lbs of refrigerant or less What MUST be placed on a refrigerant cylinder being returned for reclaiming. - ** A refrigerant label. After completing the transfer of liquid refrigerant between a recovery unit and a refrigeration system, you should guard against what? - ** Trapping liquid refrigerant between the service valves. When pressurizing a system with nitrogen, you should always? - ** Charge through a pressure regulator. What are the three "R's"? - ** Recover, Recycle, and Reclaim. In relation to the three "R's" what is Recover? - ** To remove refrigerant in any condition from a system and store it in an external approved container. In relation to the three "R's" what is Recycle? - ** To clean refrigerant for reuse by seperating the oil from the refrigerant and removing moisture from the refrigerant by passing it through one or more filter dryers. Can Recycled refrigerant be resold? - ** It cannot be re-sold but it can be re-used. In relation to the three "R's" what is Reclaim? - ** To process refrigerant to a level equal to new (virgin) product specifications as determined by chemical analysis. Can Reclaimed refrigerant be resold? - ** Yes, but must meet the standard set forth in ARI 700 before it can be resold.
TXV -
** Thermostatic Expansion Valve The EPA considers a major repair to be the replacement of what 4 items? - ** 1.Evaporator 2.Condenser 3.Compressor 4.Auxillary Heat Exchanger When the refrigerant is put back into a Type III chiller, following recovery and system repair, where is it added? - ** The charging valve on the evaporator. What method is used to find suspected water tube leaks in chillers? - ** Hydrostatic (tube) test What temperature should be attained when removing oil from a low pressure system to ensure a lower level of refrigerants in the oil? - ** 130-Degrees F The typical design burst pressure for a rupture disc is what? - ** 15 PSIG Excessive moisture collection in the purge unit can indicate what? - ** Tube Leakage Vacuum pumps need to be capable of pulling what level of vacuum? - ** 500 microns All refrigeration systems containing more than 50 lbs. of refrigerant must be repaired when the annual leak rate exceeds___? - ** 35%
The most efficient method of leak checking a charged low-pressure system is to use? - ** Controlled hot water or heater blankets. Systems with open drive compressors are prone to leak where? - ** At the shaft seal. What does ASHRAE standard 15 require? - ** A refrigerant monitor that will sound and alarm and automatically start a ventilation system in equipment rooms before the refrigerant concentration reaches the TLV-TWA. TLV-TWA - ** Threshold Limit Value, Time Weighted Average A-1 Group Refrigerants only require what? - ** Oxygen Deprivation Sensor All "B" rated refrigerants require what? - ** "Refrigerant Specific" Mechanical Room Sensor. What are Cooling Towers? - ** They are heat removal devices used to transfer process waste heat to the atmosphere. What is the maximum test pressure to use for pressurizing Type III centrifugal systems with nitrogen? - ** 10 psig Enough vapor has entered the system and you may begin charging liquid refrigerant when the refrigerant saturation temperature increases to? - ** 36F
