York DY 048 Technical Manual

Also see for DY 036: Technical guide

York DY 048 Technical Manual Manual pdf 32 page image

343615-YTG-B-030832 Johnson Controls Unitary ProductsGUIDE SPECIFICATIONSGENERALUnits shall be manufactured by York International UnitaryProducts Group in an ISO 9001 certified facility.York's Sunline Magnum™ units are convertible single pack-age units. Although the units are primarily designed for curbmounting on a roof, they can also be slab-mounted at groundlevel or set on steel beams above a finished roof. Coolingonly, cooling with gas heat and cooling with electric heatmodels are available with a wide variety of factory-mountedoptions and field-installed accessories to make them suitablefor almost every application. All units are self-contained andassembled on full perimeter base rails with holes in the fourcorners for overhead rigging. Every unit is completely piped,wired, charged and tested at the factory to simplify the fieldinstallation and to provide years of dependable operation. Allmodels (including those with an economizer) are suitable foreither bottom or horizontal duct connections. Models withpower exhaust are suitable for bottom duct connections only.For bottom duct, remove the sheet metal panels from thesupply and return air openings through the base of the unit.For horizontal duct, remove the supply and return air panelson the rear of the unit.All non-Scroll compressors include crankcase heaters and allcompressors have internal pressure relief. Every refrigerantcircuit includes a liquid line filter-drier, a discharge line highpressure switch and a suction line with a freezestat and lowpressure/loss of charge switch.The unit control circuitincludes a 75 VA transformer, a 24-volt circuit breaker and arelay board with a compressor lockout circuit, a terminal stripfor thermostat wiring, plus an additional set of pin connectorsto simplify the interface of additional field controls. All modelsare CSA listed. All models include a 1-year limited warrantyon the complete unit. Compressors and electric heater ele-ments carry a 5-year warranty. Aluminized steel and Stainlesssteel tubular heat exchangers carry a 10-year warranty.DESCRIPTIONUnits shall be factory-assembled, single packaged, ElectricCooling/Gas Heat, Electric Cooling/Optional Electric Heatand designed for outdoor mounted installation.The 3 ton, 4 ton and 5 ton units shall have minimum SEERrating of 14. They shall have built-in field convertible ductconnections for down discharge supply/return or horizontaldischarge supply/return, and be available with factoryinstalled options or field installed accessories. The units shallbe factory wired, piped, charged with R-22 refrigerant andfactory tested prior to shipment. All unit wiring shall be bothnumbered and color coded. All units the cooling performanceshall be rated in accordance with DOE and ARI test proce-dures. Units shall be CSA listed, classified to ANSI Z21.47,UL 1995/CSA No. 236 standards.UNIT CABINETUnit cabinet shall be constructed of a combination of G60 andG90 galvanized steel, with exterior surfaces coated with anon-chalking, powdered paint finish, certified at 750 hourssalt spray test per ASTMB117 standards. Indoor blower sec-tion shall be insulated with a minimum 1/2” thick insulation,coated on the airside. Aluminum foil faced insulation shall beused in the furnace compartment and be fastened with ridgedfasteners to prevent insulation from entering the air stream.Cabinet panels shall be “large” size, easily removable for ser-vicing and maintenance. Full perimeter base rails shall beprovided to assure reliable transit of equipment, overhead rig-ging and proper sealing on roof curb applications. Disposable1" filters shall be furnished and be accessible through aremovable access door, sealed airtight. Units filter track shallbe designed to accommodate either 1" or 2" filters. Fan per-formance measuring ports shall be provided on the outside ofthe cabinet to allow accurate air measurements of evaporatorfan performance without removing panels or creating air by-pass of the coils. Condensate pan shall be internally slopedand conform to ASHRAE 62-89 self-draining standards. Con-densate connection shall be a minimum of 3/4” I.D. femaleand be a ridged mount connection.INDOOR (EVAPORATOR) FAN ASSEMBLYThe indoor fan shall be a factory installed direct drive. Jobsite selected (B.H.P.) brake horsepower shall not exceed themotors nameplate horsepower rating, plus the service factor.Units shall be designed not to operate above service factor.Fan wheel shall be double-inlet type with forward-curvedblades, dynamically balanced to operate smoothly throughoutthe entire range of operation. Airflow design shall be constantair volume. Bearings shall be sealed and permanently lubri-cated for longer life and no maintenance.OUTDOOR (CONDENSER) FAN ASSEMBLYThe outdoor fan shall be of the direct-driven propeller type,discharge air vertically, have aluminum blades riveted to acorrosion resistant steel spider bracket and shall be dynami-cally balanced for smooth operation. The outdoor fan motorshall be totally enclosed with permanently lubricated bear-ings, internally protected against overload conditions andstaged independently.REFRIGERANT COMPONENTSCompressor:a. Shall be internally protected with internal high-pres-sure relief and over temperature protection.b. Shall have internal spring isolation and sound muf-fling to minimize vibration and noise, and be exter-nally isolated on a dedicated, independent mounting.