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E. The open ends of the PVC conduit or boxes shall be sealed to keep water and vermin from <br /> entering the pipe. Ends of PVC conduit shall extend a minimum of 6" above ground or concrete <br /> slab. <br /> F. A separate PVC conduit shall be provided for each air conditioning system and for each <br /> refrigerant circuit on units with multiple circuits. <br /> 3.2 INSTALLATION OF REFRIGERATION PIPING <br /> A. Pitch refrigerant piping in direction of oil return to compressor. Provide oil traps and double <br /> section risers where indicated, and where required to provide oil return. <br /> 3.3 INSTALLATION OF SPECIAL REFRIGERATION VALVES <br /> A. Install refrigeration valves where indicated, and in accordance with manufacturer's instructions. <br /> Remove accessible internal parts before soldering or brazing, replace after joints are completed. <br /> Solenoid Valves: Install in refrigerant piping as indicated with stem pointing upwards. <br /> 3.4 INSTALLATION OF REFRIGERATION ACCESSORIES <br /> A. Refrigerant Strainers: Install in refrigerant lines as indicated, and in accessible location for <br /> service. <br /> B. Moisture-Liquid Indicators: Install as indicated on refrigerant liquid lines, in accessible location. <br /> C. Refrigerant Filter-Dryers: Install in refrigerant lines as indicated, and in accessible location for <br /> service. <br /> D. Evaporator Pressure Regulators: Install in refrigerant suction lines or evaporator outlets as <br /> indicated. Adjust, if required, for proper evaporator pressure. <br /> E. Refrigerant Discharge Line Mufflers: Install as indicated, in horizontal or down flow portion of <br /> hot-gas lines, immediately after leaving compressor; not in riser. <br /> 3.5 EQUIPMENT CONNECTIONS <br /> A. Connect refrigerant piping to mechanical equipment in manner shown, and comply with <br /> equipment manufacturer's instructions where not otherwise indicated. <br /> 3.6 FIELD QUALITY CONTROL <br /> A. Refrigerant Piping Leak Test: Prior to initial operation, clean and test refrigerant piping in <br /> accordance with ANSI B31.5 and ANSI B31.5a, "Refrigeration Piping". Perform initial test with <br /> dry nitrogen, using soap solution to test all joints. Perform final test with 27" vacuum, and then <br /> 200 PSI using halide torch. System must be entirely leak-free. <br /> B. Repair or replace refrigerant piping as required to eliminate leaks, and retest as specified to <br /> demonstrate compliance. <br /> END OF SECTION 23 23 00 <br /> CEA#18010 REFRIGERANT PIPING SYSTEMS 23 23 00 -4 <br /> COPYRIGHT©2016 CONSULTING ENGINEERING ASSOCIATES, INC. <br />