EPA 608 (TYPE II) Exam

EPA 608 (TYPE II) Exam When a new system has been assembled, the first thing to do is? - Pressurize the system with an inert gas & leak check. After installation of a field-piped R-410A split heat pulp, the unit should first be? - Pressurized with nitrogen then leak checked. The EPA regulations require that any appliances containing more than 50 pounds of refrigerant (except for commercial & industrial process refrigeration) must be repaired when the leak rate exceeds _________ of the charge per year? - 15% R-410A requires recovery tanks rated for at least? - 400 psig After refrigerant liquid has been recovered from a system, any remaining vapor is? - Condensed by the recovery system. Your recovery/recycling machine has R-502 refrigerant in it. You now have to recover refrigerant from a unit with R-22. What must be done before the R-22 refrigerant can be recovered/recycled? - Recover as much R-502 from the recovery unit as possible, change filter, & evacuate. In a refrigeration system with a TXV (or other type of throttling device), the component directly following the condenser is the? - Receiver When charging an R-410A system that uses a water-cooled condenser, you must first charge with vapor to a pressure of at least________, before switching to liquid charging. - 120 psig Recovered refrigerant may contain what? - 1.) Acids 2.) Moisture 3.) Oils Your recovery/recycling machine has R-22 refrigerant in it. You now have to recover refrigerant from a unit with R-410A. What must be done before your recovery unit can be used to recover R-410A? - 1.) The recovery unit must be EPA certified for use with R-410A. 2.) The recovery tank must be designed for the pressure of R-410A. 3.) The filter & lubricant in the recovery unit must be changed, & the recovery unit evacuated. To recover liquid refrigerant, you must connect one hose to the? - Liquid Line. The proper charging method for blended (non-azeotropic) refrigerants (400 Series) is to use a remove the charge from the cylinder as a? - Liquid Before using a recovery unit to remove a charge, what steps should be taken? - 1.) Check service valve positions. 2.) Check the oil level in the recovery unit. 3.) Evacuate recovery unit & recovery tank. On refrigeration units that use an open compressor; the ________ is most likely to leak if the unit is not used for several months. - The rotating shaft seal. Noncondensables in a system cause? - Higher discharge pressure. Heat Pumps that use R-410A should be leak checked with? - Pressurized Nitrogen. A reciprocating compressor should not be energized when? - The discharge service valve is closed.