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' C. Compressor: Rotary hermetic-type compressor, 1,750 RPM, designed for air-cooled condensing, complete with <br /> sight glass, and backseating service access valves on suction and discharge ports. Capacity shall be controlled <br /> through on/off operation of multiple compressors. Additional features include: <br /> 1. Capacity steps as scheduled,or greater number; <br /> D. Controls: Operating and safety controls shall include high and low pressure cutouts,oil pressure cutout,compressor <br /> winding thermostat cutout, 3-leg compressor overload protection, and condenser fan motors with thermal and <br /> overload cutouts. Control transformer if required shall be 115-volts. Provide magnetic contactors for compressor <br /> and condenser fan motors. Additional features include: <br /> 1. Automatic nonrecycling pumpdown,and timing device to prevent excessive compressor cycling. <br /> E. Condensing Section: Condenser coil shall be seamless copper tubing mechanically bonded to heavy-duty, <br /> configurated aluminum fins, with separate and independent refrigeration circuit for each compressor. Units shall <br /> include liquid accumulator and subcooling circuit,and backseating liquid line service access valve. Condenser coils <br /> shall be factory-tested at 450 psig,vacuum dehydrate,and filled with a holding charge of nitrogen. <br /> ' F. Condenser fans and drives: propeller-type condenser fans for vertical air discharge;either direct drive or belt drive. <br /> Additional features include: <br /> 1. Permanent lubricated ball bearing condenser fan motors; <br /> 2. Separate motor for each condenser fan; <br /> 3. Constant speed condenser fan motors; <br /> ' 4. Each fan assembly shall be dynamically and statically balanced <br /> PART 3: EXECUTION <br /> 3.01 EXAMINATION <br /> ' A. Verify roof structure, mounting supports, and membrane installations are completed to the proper point to allow <br /> installation of roof mounted units. Do not proceed with work until unsatisfactory conditions have been corrected. <br /> 3.02 INSTALLATION <br /> A. General: Install condensing units in accordance with manufacturers installation instructions. Install units plumb <br /> and level,firmly anchored in locations indicated,and maintain manufacturer's recommended clearances. <br /> ' B. Support: <br /> 1. Install roof-mounted units on equipment supports specified in Division 7. Anchor unit to supports with <br /> removable fasteners. <br /> 2. Install ground-mounted units on 4"thick reinforced concrete pad,4"larger on each side than condensing unit. <br /> Concrete is specified in Division 3. Coordinate installation of anchoring devices. <br /> 3. Air-Cooled Condensing Units: Connect refrigerant piping to unit;maintain required access to unit. <br /> ' a. Install furnished field-mounted accessories. <br /> ' 15670-3 No.99132-CP2 <br />