EPA 608 Certification Exam Graded A+

How can you speed up the removal of the refrigerant charge from system? - ANSWER Cooling the recovery cylinder to lower its pressure. How long must an HVAC servicing company keep records for each disposed appliance wi ...

How can you speed up the removal of the refrigerant charge from system? - ANSWER Cooling the recovery cylinder to lower its pressure. How long must an HVAC servicing company keep records for each disposed appliance with a charge between 5 and 50 lbs? - ANSWER 3 years (Both answers) Recovered refrigerant may contain which of the following impurities? - ANSWER Acids, Moisture, and Oil What area of a refrigeration system does oil foaming usually occur? - ANSWER Compressor What is a deep vacuum usually measured in? - ANSWER Microns What is the primary water source for a water cooled recovery unit condensing coil? - ANSWER Local municipal water supply What is the state of the refrigerant leaving the receiver in a refrigeration system? - ANSWER High pressure liquid What should be done after reaching the required recovery vacuum on an appliance? - ANSWER Wait for at least a few minutes to see if the system pressure rises. Which of the following CANNOT be used as a reason to extend the appliance repair deadlines? - ANSWER A certified service technician is not available. Which of the following refrigerants would be used in a low-pressure appliance? - ANSWER R-123 Which of the following repairs would always be considered "major" under EPA's regulations? - ANSWER Replacement of an Evaporator Coil Which of the following should be replaced if a system is opened for servicing? - ANSWER Filter Drier Which of the following statements about recycling and recovery equipment used for stationary refrigeration is FALSE? - ANSWER Purchases of such equipment must be reported to the EPA. Your recovery/recycling machine has R-22 refrigerant in it. you now have to recover refrigerant from an R-410a unit. What must be done before recovery? - ANSWER Remove the R-22 from the recovery unit and change filter. Which refrigerant does NOT contain chlorine? - ANSWER R-134a Which refrigerant(s) must be recovered before opening or disposing of appliances? - ANSWER All three listed (HFC's, CFC's, HCFC's) State and local governments may: - ANSWER Establish laws that contain stricter requirements. HFC refrigerants contain which of the following? - ANSWER Hydrogen, Fluorine, Carbon (HFC) How many ozone molecules can each chlorine atom in the stratosphere destroy? - ANSWER 1000,000 Molecules Which type of refrigerant typically has the lowest global warming potential? - ANSWER HFO's (Hydrofluoroolefin) Which element of a CFC or HCFC molecule causes ozone depletion? - ANSWER Chlorine What characteristic(s) of CFC's and HCFC's make them more likely to reach the stratosphere than most other compounds containing chlorine? - ANSWER They do not dissolve in water or easily break down in ht atmosphere. A major system repair is being performed on an R-22 appliance. What CANNOT be done to service the appliance? - ANSWER Top off unit with R-410a In which component of a system does the refrigerant change from a high-pressure vapor to a high-pressure liquid? - ANSWER Condensor What must be done before disposing of any appliance containing a CFC,HCFC, or HFC refrigerant? - ANSWER Recover the refrigerant Which process applies to cleaning refrigerant for immediate reuse by oil separation and single or multiple passes through devices, like replaceable ore filters driers, which reduce moisture and acidity? - ANSWER Recycling Which refrigerant does NOT contain chlorine? - ANSWER R-134a A hydrostatic tube test kit will; - ANSWER Determine if a tube leaks Charged low-pressure refrigeration machines may be most efficiently leak checked by; - ANSWER Adding heat with circulated hot water or heating blankets.