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4. Spring hangers to support vertical runs. <br /> C. Install hangers with the following minimum rod sizes and maximums acing: ' <br /> Nom Pipe Size Max.Span-Ft. Min.Rod Size-Inches ' <br /> 1 7 3/8 <br /> 1-1/2 9 3/8 <br /> 2 10 3/8 ' <br /> 3 12 1/2 <br /> 3-1/2 13 1/2 <br /> 4 14 5/8 , <br /> 5 15 5/8 <br /> 6 15 3/4 <br /> D. Support vertical runs at each floor. ' <br /> 3.05 PIPE JOINT CONSTRUCTION <br /> A. Brazed Joints: Comply with the procedures contained in the AWS"Brazing Manual." , <br /> 1. WARNING: Some filler metals contain compounds which produce highly toxic fumes when heated. Avoid <br /> breathing fumes. Provide adequate ventilation. ' <br /> 2. CAUTION: When solenoid valves are being installed, remove the coil to prevent damage. When sight <br /> glasses are being installed, remove the glass. Remove stems, seats, and packing of valves, and accessible <br /> internal parts of refrigerant specialties before brazing. Do not apply heat near the bulb of the expansion valve. <br /> B. Fill the pipe and fittings during brazing, with an inert gas(ie.,nitrogen or carbon dioxide)to prevent formation of <br /> scale. <br /> C. Heat joints using oxy-acetylene torch. Heat to proper and uniform brazing temperature. <br /> 3.06 VALVE INSTALLATIONS <br /> A. General: Install refrigerant valves where indicated,and in accordance with manufacturer's instructions. <br /> B. Install globe valves on each side of strainers and driers,in liquid and suction lines at evaporators,and elsewhere as <br /> indicated. <br /> C. Install a full sized,3-valve bypass around each drier. , <br /> D. Install solenoid valves ahead of each expansion valve and hot-gas bypass valve. Install solenoid valves in <br /> horizontal lines with coil at the top. , <br /> E. Thermostatic expansion valves may be mounted in any position,as close as possible to the evaporator. <br /> 1. Where refrigerant distributors are used,mount the distributor directly on the expansion valve outlet. ' <br /> 2. Install the valve in such a location so that the diaphragm case is warmer than the bulb. ' <br /> 15530-6 No.99132-CP2 <br />