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2.07 REFRIGERANT ' <br /> A. Refrigerant No.22,in accordance with ASHRAE Standard 34. <br /> PART 3: EXECUTION <br /> 3.01 EXAINMATION , <br /> A. Examine rough-in for refrigerant piping systems to verify actual locations of piping connections prior to installation. <br /> 3.02 PIPE APPLICATIONS , <br /> A. Use Type L, or Type ACR(1-3/8 inch and smaller) drawn copper tubing with wrought copper fittings and brazed <br /> joints above ground,within building. ' <br /> B. If other than Type ACR tubing is used, clean and protect inside of tubing as specified in Article "CLEANING" <br /> below. <br /> 3.03 PIPING INSTALLATIONS <br /> A. General: Install refrigerant piping in accordance with ASHRAE Standard 15 - "The Safety Code for Mechanical <br /> Refrigeration." <br /> B. Install piping in as short and direct arrangement as possible to minimize pressure drop. ' <br /> C. Install piping for minimum number of joints using as few elbows and other fitting as possible. <br /> D. Arrange piping to allow normal inspection and servicing of compressor and other equipment. Install valves and <br /> specialties in accessible locations to allow for servicing and inspection. <br /> E. Provide adequate clearance between pipe and adjacent walls and hanger, or between pipes for insulation <br /> installation. Use sleeves through floors,walls,or ceilings,sized to permit installation of full thickness insulation. <br /> F. Insulate suction lines. Liquid lines are not required to be insulated, except where they are installed adjacent and <br /> clamped to suction lines,where both liquid and suction lines shall be insulated as a unit. <br /> 1. Do not install insulation until system testing has been completed and all leaks have been eliminated. <br /> G. Install branch tie-in lines to parallel compressors equal length,and pipe identically and symmetrically. ' <br /> H. Install copper tubing in rigid or flexible conduit in locations where copper tubing will be exposed to mechanical ' <br /> injury. <br /> I. Slope refrigerant piping as follows: <br /> 1. Install horizontal hot gas discharge piping with 1/2"per 10 feet downward slope away from the compressor. <br /> 2. Install horizontal suction lines with 1/2 inch per 10 feet downward slope to the compressor,with no long traps <br /> or dead ends which may cause oil to separate from the suction gas and return to the compressor in damaging <br /> slugs. <br /> 155304 No.99132-CP2 <br />