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PACKAGED AIR CONDITIONING <br />UNITS <br />Section 15855 <br />15-1207 <br />5. The compressor shall be resiliently mounted and have built- in, three -mode crankshaft <br />lubrication; crankcase heater; discharge temperature limiter; and current- and temperature - <br />sensing motor overloads. <br />6. The cooling system shall be protected by high and low pressure switches, filter dryer, oil <br />failure switch, and a five-minute, compressor, timed off cycle controller (anti- recycle timer), <br />and evaporator coil frostat that shall disable cooling when temperatures on the evaporator <br />coil reach 10 degrees or below. Mechanical cooling will start again when temperatures on <br />the evaporator coil rise to 50 degrees or above. <br />B. Cabinet: <br />1. Galvanized steel with a baked -on outdoor enamel paint finish. <br />2. Cabinet panels where conditioned air is handled shall be fully insulated. <br />3. Lifting lugs shall be provided for rigging. <br />4. Unit shall have a raised 1 1/8 inch lip around the supply and return openings. <br />C. Single -side Service Access: <br />1. All components, wiring, and inspection areas shall be completely accessible via one side of <br />the unit through hinged access panels. <br />2. Hinged access panels shall provide access to filter section, fan section, compressor section, <br />heat section, and controls. <br />a. No tools shall be required for the panels. <br />D. <br />Supply Air Blowers: <br />1. <br />Centrifugal blowers shall have belt drive motors unless noted otherwise on the Drawings. <br />2. <br />The entire assembly shall be resilient rubber mounted. <br />3. <br />Blower wheel assembly shall be statically and dynamically balanced. <br />4. <br />Supply blower motors shall be thermally protected and meet the US EPACT 1992 Code. <br />E. <br />Supply <br />Blower Variable Frequency Drive (VFD): <br />1. <br />Provide variable air volume supply air temperature control with variable frequency drive <br />without bypass where noted on drawings. <br />2. <br />Provide all necessary controls to modulate the VFD in cooling mode to maintain a <br />discharge air temperature setpoint. <br />F. <br />Condenser Fans: <br />1. <br />Propeller -type condenser fans shall discharge vertically. <br />2. <br />Fan motor shall be totally enclosed with sleeve bearings, permanently lubricated, thermally <br />protected and equipped with rain shield. <br />3. <br />Fan shall be protected by a steel guard. <br />G. <br />Condenser Coil Guard: <br />1. <br />Factory installed tool -less panel guard shall be manufactured from minimum 20 gauge steel <br />with G90 -U corrosion protection. <br />2. <br />The panel shall be powder coated to match the unit color. <br />3. <br />Guard open area shall be between fifty percent and sixty percent. <br />H. <br />Evaporator <br />Coil Drainpan: <br />1. <br />Drainpan shall be constructed of stainless steel and shall be double -sloped. <br />2. <br />Unit shall allow for drain on either side and shall have reversible drainpan provided. <br />Cl <br />