York DNP024 Technical Manual
Also see for Affinity DNP024: Installation manual
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Contents
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036-21366-007-A-1205Unitary Products Group 33MECHANICAL SPECIFICATIONSGENERALUnits shall be manufactured by York International UnitaryProducts Group in an ISO 9001 certified facility. YORK’sDNP is a unit that gives you the flexibility and choices youneed in today’s market. These packaged cooling/heating airconditioners are designed for outdoor installation. Only utilityand duct connections are required at the point of installation.The gas fired heaters have aluminized steel tubular heatexchangers and hot surface to pilot ignition. They are avail-able in natural gas with field conversion to propane.DESCRIPTIONUnits shall be factory-assembled, single packaged, ElectricCooling/Gas Heating units, designed for outdoor mountedinstallation. For SEER ratings, refer to technical literature.They shall have built in, equal size, field convertible ductconnections for down discharge supply/return or horizontaldischarge supply/return. The units shall be factory wired,piped, charged with R-22 refrigerant and factory tested priorto shipment. All unit wiring shall be both numbered andcolor coded. All units shall be manufactured in a facility cer-tified to ISO 9001 standards, and the cooling performanceshall be rated in accordance with DOE and ARI test proce-dures. The heating performance shall be rated to DOE andGAMA test procedures. Units shall be CSA listed and classi-fied to ANSI Z21.47/CAN/CSA 2.3 standards and UL 1995/CAN/CSA No. 236-M90 conditions.UNIT CABINETUnit cabinet shall be constructed of G90 galvanized steel,with exterior surfaces coated with a non-chalking, powderedpaint finish, certified at 1000 hours salt spray test per ASTM-B117 standards. The unit top shall be a single piece “WaterShed” design, with drip edges and no-seam corners to pro-vide optimum water integrity. Unit shall have a rigidlymounted condenser coil guard to provide protection fromobjects and personnel after installation. Indoor blower sectionshall be insulated with up to 3/4” thick, aluminum, foil facedinsulation, fastened to prevent insulation from entering the airstream. Cabinet panels shall be “large” size, easily remov-able for servicing and maintenance, with built-in lift handles.Unit shall be built on a formed, “Super-Structure” design basepan, with embossments at critical points to add strength,rigidity and aid in minimizing sound. Full perimeter base railsshall be provided to assure reliable transit of equipment,overhead rigging, for truck access and proper sealing on roofcurb applications. Base rails shall be removable, whenrequired, to lower unit height. Filters shall be furnished andbe accessible through a removable access door, sealed air-tight. Units vertical discharge and return duct configurationshall be designed to fit between standard 24” O.C. beamswithout modification to building structure, duct work and baseunit. Condensate pan shall be internally sloped and conformto ASHRAE 62-89 self-draining standards, with 3/4” NPTIcopper, ridged mount connection.INDOOR (EVAPORATOR) FAN ASSEMBLYFan shall be direct drive, multi-speed design. Job siteselected (BHP) brake horsepower shall not exceed themotors nameplate horsepower rating. Fan wheel shall bedouble-inlet type with forward-curved blades, dynamicallybalanced to operate smoothly throughout the entire range ofoperation. Airflow design shall be constant air volume. Bear-ings shall be sealed and permanently lubricated for longer lifeand no maintenance. Fan assembly shall be “Slip Track”(slide-out) design for easy removal and cleaning.OUTDOOR (CONDENSER) FAN ASSEMBLYThe outdoor fan shall be of the direct-driven propeller type,discharge air vertically, have aluminum blades riveted to cor-rosion resistant steel spider bracket and shall be staticallybalanced for smooth operation. The outdoor fan motor shallbe totally enclosed with permanently lubricated bearings andinternally protected against overload conditions.REFRIGERANT COMPONENTSCompressors:a. Shall be fully hermetic type, direct drive, internallyprotected with internal high-pressure relief and overtemperature protection. The hermetic motor shall besuction gas cooled and have a voltage range of + or- 10% of the unit nameplate voltage.b. Shall have internal isolation and sound muffling tominimize vibration and noise, and be externally iso-lated on a dedicated, independent mounting.Coils:a. Evaporator and condenser coils shall have alumi-num plate fins mechanically bonded to seamlessinternally enhanced copper tubes with all jointsbrazed.b. Evaporator coil shall be of the direct expansion,blow through design, while condenser coil shall bedraw through design.Refrigerant Circuit and Refrigerant Safety Components:a. Shall include independent thermal expansiondevices (TXV).b. Shall include filter/strainer to eliminate any foreignmatter. |
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