EPA 608 Certification – Flashcards
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What date was the sale of CFC's & HCFC's restricted to technicians certified in refrigerant recovery?
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November 14, 1994
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Section 608 of the Federal Clean Air Act requires technicians to what?
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Recover all refrigerants.
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The objective of the Clean Air Act is to protect what?
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The earth's stratosphere.
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HFC's
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HydroFlouroCarbon's
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CFC's
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ChloroFluoroCarbon's
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ODP
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Ozone Depletion Potential
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Which international treaty agreement was the basis for Section 608?
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The Montreal Protocol.
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Depletion of the ozone in the stratosphere is know to cause what 6 things?
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1.Crop losses
2.Increases in eye diseases
3.Skin Cancer
4.Reduced marine life
5.Deforestation
6.Increased ground level ozone
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What happens when CFC or HCFC molecules get in the stratosphere & free atoms of Chlorine are set free?
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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.
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What date was recovery equipment required to be certified by a lab, & achieve higher evacuation levels, & have low loss fittings?
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November 15, 1993
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On what date was technician certification required?
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November 14, 1994
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What date was CFC's phased out of production?
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December 31, 1995
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What is EPA 608 Type I certification?
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Persons who maintain, service, repair, or dispose of small appliances (containing 5 pounds of refrigerant (or less).
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What is EPA 608 Type II certification?
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Persons who maintain, service, repair, or dispose of high and very high pressure appliances. Except small appliances and motor vehicle air conditioning systems.
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What is EPA 608 Type III certification?
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Persons who maintain, service, repair, or dispose of low pressure appliances.
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What is EPA 608 Universal certification?
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Persons who maintain, service, repair, or dispose of both low and high pressure equipment, as well as appliances.
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HCFC's
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HydroChloroFluoroCarbons
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What are HydroChloroFluoroCarbons?
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Commonly known as HCFC's, they are a group of man-made compunds containing hydrogen, chlorine, fluorine, and carbon.
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A recovery cylinder must not be filled more than ___ % of it's capacity by weight?
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80%
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How should refrigerant cylinders be shipped?
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Up-right with proper DOT classification tags.
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What oil MUST be used with ALL HFC's for HVAC/Refrigeration but will also work with CFC's and HCFC's.
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Polyolester
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HCFC's have very low atmospheric concentrations measured in parts per?
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Trillion
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All cooling systems containing more than 50 lbs. of refrigerant must be repaired when the annual leak rate exceeds___?
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15%
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Mineral Oils are used with?
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All CFC's
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Alkebenzene is used alone or as an additive for?
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HCFC's (Will also work with CFC's)
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POE
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Polyolester
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What is the definition of a Type I Appliance?
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A small appliance that is manufactured, charged, and hermetically sealed in a factory with 5 Lbs. of refrigerant or less.
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What is the definition of a Type II Appliance?
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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.
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What is the definition of a Type III Appliance?
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Low pressure equipment like low pressure chillers.
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All refrigerants are assumed to be a single chemical if they are numbered what?
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1-399 and 600 and above.
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What is an Azeotrope?
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A mixture of two or more liquids in such a ratio that it's composition cannot be changed by vaporizing it.
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Azeotrope's are numbered what?
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500 to 599
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What is fractionation?
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When the refrigerant leaks, it leaks out in different rates due to the different pressures.
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What is Temperature Glide?
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When the temperature of the vaporizing refrigerant changes, even though the pressure remains the same.
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What are the two basic types of recovery devices?
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Self-Contained and System-Dependent.
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System-Dependent devices may only be used on appliances containing how much refrigerant?
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15 Lbs of refrigerant or less
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What MUST be placed on a refrigerant cylinder being returned for reclaiming.
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A refrigerant label.
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After completing the transfer of liquid refrigerant between a recovery unit and a refrigeration system, you should guard against what?
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Trapping liquid refrigerant between the service valves.
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When pressurizing a system with nitrogen, you should always?
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Charge through a pressure regulator.
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What are the three "R's"?
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Recover, Recycle, and Reclaim.
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In relation to the three "R's" what is Recover?
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To remove refrigerant in any condition from a system and store it in an external approved container.
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In relation to the three "R's" what is Recycle?
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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.
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Can Recycled refrigerant be resold?
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It cannot be re-sold but it can be re-used.
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In relation to the three "R's" what is Reclaim?
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To process refrigerant to a level equal to new (virgin) product specifications as determined by chemical analysis.
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Can Reclaimed refrigerant be resold?
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Yes, but must meet the standard set forth in ARI 700 before it can be resold.
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What chemical has been found in the stratosphere indicating ozone depletion?
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Chlorine Monoxide (CLO)
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What are 5 Type I appliances?
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1.Household refrigerators
2.Household freezers
3.Room air conditioners
4.Water Coolers
5.Drinking fountains
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What are 6 Type II appliances?
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1.Walk-in coolers
2.Walk-in freezers
3.Reach-in refrigerators
4.Reach-in freezers
5.Residential & Commercial comfort cooling systems
6.Ice machines
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What is an example of a Type III appliance?
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Low pressure chiller.
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When is "Dew Point" used?
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When calculating Superheat.
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When is "Bubble Point" used?
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When calculating Sub-cooling.
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What does the EPA require on all Type I equipment that uses Class I or Class II refrigerants.
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EPA requires a service aperature (process stub).
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TXV
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Thermostatic Expansion Valve
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The EPA considers a major repair to be the replacement of what 4 items?
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1.Evaporator
2.Condenser
3.Compressor
4.Auxillary Heat Exchanger
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When the refrigerant is put back into a Type III chiller, following recovery and system repair, where is it added?
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The charging valve on the evaporator.
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What method is used to find suspected water tube leaks in chillers?
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Hydrostatic (tube) test
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What temperature should be attained when removing oil from a low pressure system to ensure a lower level of refrigerants in the oil?
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130-Degrees F
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The typical design burst pressure for a rupture disc is what?
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15 PSIG
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Excessive moisture collection in the purge unit can indicate what?
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Tube Leakage
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Vacuum pumps need to be capable of pulling what level of vacuum?
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500 microns
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All refrigeration systems containing more than 50 lbs. of refrigerant must be repaired when the annual leak rate exceeds___?
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35%
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The most efficient method of leak checking a charged low-pressure system is to use?
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Controlled hot water or heater blankets.
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Systems with open drive compressors are prone to leak where?
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At the shaft seal.
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What does ASHRAE standard 15 require?
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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.
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TLV-TWA
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Threshold Limit Value, Time Weighted Average
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A-1 Group Refrigerants only require what?
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Oxygen Deprivation Sensor
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All "B" rated refrigerants require what?
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"Refrigerant Specific" Mechanical Room Sensor.
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What are Cooling Towers?
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They are heat removal devices used to transfer process waste heat to the atmosphere.
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What is the maximum test pressure to use for pressurizing Type III centrifugal systems with nitrogen?
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10 psig
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Enough vapor has entered the system and you may begin charging liquid refrigerant when the refrigerant saturation temperature increases to?
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36F
