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Mechanical Specifications <br />General <br />The units shall be horizontal airflow as shipped and <br />convertible to downflow. <br />All units shall be factory assembled, piped, internally <br />wired and fully charged with refrigerant. Units shall be <br />certified to UL Standard 1995. Units shall be designed <br />to operate at ambient temperatures as high as 115°F. <br />Cooling performance shall be rated in accordance with <br />AHRI standards. The YC heating/cooling unit design is <br />certified to ANSI 221.47/CSA 2.3, specifically for <br />outdoor applications using natural gas or propane. All <br />units shall be designed for outdoor rooftop or ground <br />level installation. <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 (2-4 Ton Models) All aluminum <br />micro channel, extruded tubes, mechanically bonded <br />to aluminum fins, and factory pressure and leak tested <br />at 480 —650 psig. All units have TXV to control <br />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 />Heating System <br />Gas -Fired Heating Section <br />Models shall provide completely assembled, wired and <br />piped gas fired heating systems within unit. Design <br />certified by UL, specifically for outdoor application. <br />Threaded gas connection on the unit. <br />Electric Ignition System <br />Main burner is lit each time thermostat calls for heat. <br />Flame sensor proves flame and keeps the main burner <br />on. Should a loss of flame occur, the main valve closes <br />and the spark recurs within 0.8 seconds. When <br />thermostat is satisfied, main burner is extinquished. <br />Forced Combustion Blower <br />Insures flame stability under varying wind conditions. <br />Gives higher combustion efficiency and location <br />flexibility. <br />Heat Exchanger <br />Stainless steel tubes. Free floating design. <br />Burners <br />Stainless steel. Multi -port inshot. <br />4YCC4048A-SUB-1 F-EN 13 <br />