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Mechanical Specifications <br />General <br />The units shall be horizontal airflow as shipped and <br />convertible to downflow. All units shall be factory <br />assembled, piped, internally wired and fully charged <br />with refrigerant. Units shall be certified to UL Standard <br />1995. All units shall be factory run tested to check <br />cooling operation, fan and blower rotation and control <br />or TXV sequence. Units shall be designed to operate at <br />ambient temperatures between 115°F and 55OF in <br />cooling as manufactured. Cooling performance shall be <br />rated in accordance with AHRI standards. <br />Unit Casing <br />All components shall be mounted in a weather - <br />resistant steel cabinet with an enamel finish. Access <br />panels shall be provided for unit controls and indoor <br />coil and fans. Indoor air section compartment shall be <br />completely insulated with fireproof, permanent, <br />odorless fiber material. Knockouts shall be provided for <br />utility and control connections. Drain connections shall <br />be provided to accommodate indoor water runoff. <br />Compressor <br />The compressor shall be hermetically sealed, high <br />efficiency scroll compressors. Internal overcurrent and <br />over temperature protection, internal pressure relief <br />shall be standard. Other features include centrifugal oil <br />pump, low vibration and noise. <br />Refrigeration System <br />All units shall have refrigerant control. Service pressure <br />tap ports and a refrigerant line filter shall be standard. <br />Evaporator Coil Internally enhanced 3/8" OD seamless <br />copper tubing mechanically bonded to aluminum fins, <br />factory pressure and leak tested at 480 — 650 psig. All <br />units have TXV to control refrigerant flow. <br />Condenser Coil <br />The Spine Fin TM condenser coil shall be continuously <br />wrapped, corrosion resistant all aluminum with <br />minimum brazed joints. This coil is 3/8" OD seamless <br />aluminum tubing glued to a continuous aluminum fin <br />Coils are lab tested to withstand 2.000 pounds of <br />pressure per square inch. The outdoor coil provides <br />low airflow resistance and efficient heat transfer. The <br />coil is protected on all four sides by louvered panels. <br />Indoor Air Fan <br />Constant Torgue, forward -curved, centrifugal wheel in <br />a Composite Vortica ® Blower housing. Motor shall <br />have thermal overload protection and permanently <br />lubricated motor bearings. Motor/blower assembly <br />isolated from unit with rubber mounts. <br />Outdoor Fan <br />One direct -drive, statically and dynamically balanced <br />propeller fan shall be used in a draw -through vertical <br />discharge configuration. Permanently lubricated <br />weather proof motor shall have built-in thermal <br />overload protection. <br />System Controls <br />System controls include condenser fan, evaporator fan <br />and compressor contactors. <br />Accessories Roof Curb <br />The roof curb shall be designed to mate with the unit <br />and provide support and complete weathertight <br />installation when properly installed. Adhesive back <br />polyurethane sealing strips shall be provided to ensure <br />an airtight seal between supply and return openings of <br />the curb and unit. The roof curb design allows field <br />fabricated ductwork to be connected directly to the <br />curb. Curb ships knocked down for field assembly, and <br />includes factory installed wood nailer strips. <br />Electric Heaters <br />Each heater assembly shall include power supply <br />fusing if over 48 amps, automatic resetting limit <br />switches and heat limiters for thermal protection. <br />Heaters shall be provided with polarized plugs for quick <br />connection to unit low voltage wiring. Electric heat <br />modules shall be UL listed. <br />Single Source Power Entry <br />This accessory when used with electric heat accessory <br />shall allow single source power connection to unit and <br />heater combination. Single source power entry kits <br />shall have specific matching heater(s). Kit shall include <br />high voltage terminal blocks, fuse blocks and fuses, cut - <br />to -length interconnecting wiring, and junction box (if <br />required) to provide power sources with fuse <br />protection as required for both the unit and accessory <br />heater. Kit components shall install within the heater <br />cabinet in the heater access section. Single source <br />branch power circuit shall be protected and wired in <br />accordance with local codes. <br />12 4WCC4036A-SUB-1 E-EN <br />