Carrier 50SZ Series Product Data
Also see for 50SZ Series: ManualInstallation, Start-Up and Service Instructions
28GUIDE SPECIFICATIONSPackaged Heat PumpsConstant Volume ApplicationHVAC Guide SpecificationsSize Range: 2 to 5 Tons, Nominal CoolingCarrier Model Number: 50SZPart 1⎯GeneralSYSTEM DESCRIPTIONOutdoor, packaged, air--to--air heat pump unit utilizing ahermetic scroll compressor for cooling duty and optionalelectric heating. Unit shall discharge supply air vertically orhorizontally as shown on contract drawings. Outdoor fan/coilsection shall have a draw--thru design with vertical discharge forminimum sound levels.QUALITY ASSURANCEA. Unit shall be rated in accordance with ARI Standards210/240--03 and 270--95.B. Unit shall be designed in accordance with UL Standard1995.C. Unit shall be manufactured in a facility registered to ISO 9001manufacturing quality standard.D. Unit shall be UL listed and c--UL certified as a total package forsafety requirements.E. Roof curb shall be designed to conform to NRCA Standards.F. Insulation and adhesives shall meet NFPA 90A requirementsfor flame spread and smoke generation.G. Cabinet insulation shall meet ASHRAE Standard 62P.DELIVERY, STORAGE AND HANDLINGUnit shall be stored and handled per manufacturer’srecommendations.Part 2 ⎯ ProductsEQUIPMENTA. General:Factory--assembled, single--piece, heat pump unit. Containedwithin the enclosure shall be all factory wiring, piping, controls,refrigerant charge (R--22), and special features required prior tofield start--up.B. Unit Cabinet:9. Unit cabinet shall be constructed of phosphated,zinc--coated, pre--painted steel capable of withstanding 500hours of salt spray.10. Normal service shall be through a single removable cabinetpanel.11. The unit shall be constructed on a rust proof unit base that hasan externally trapped, integrated sloped drain.12. Indoor fan compartment top surface shall be insulated witha minimum 1/2--in. thick, flexible fiberglass insulation,coated on the air side and retained by adhesive andmechanical means. The indoor wall sections will beinsulated with a minimum semi--rigid, foil--faced boardcapable of being wiped clean. Aluminum foil--facedfiberglass insulation shall be used in the entire indoor aircavity section.13. Unit shall have a field--supplied condensate trap.14. Metal Insulated Duct Covers for side discharge will bestandard on all sizes.15. Unit insulation conforms to ASHRAE 62P.C. Fans:1. The indoor fan shall be 3--speed, direct--drive, as shown onequipment drawings.2. Fan wheel shall be made from steel and shall be double--inlettype with forward--curved blades with corrosion resistantfinish. Fan wheel shall be dynamically balanced.3. Outdoor fan shall be direct--drive, propeller--type withaluminum blades riveted to corrosion resistant steel spiders,be dynamically balanced, and discharge air vertically.D. Compressor:1. Fully hermetic compressors with factory--installed vibrationisolation.2. Scroll compressors shall be standard on all units.3. Compressor Protection:Defrost control shall protect compressor by preventing“short cycling.”E. Coils:Indoor and outdoor coils shall have aluminum plate finsmechanically bonded to seamless copper tubes with all jointsbrazed. (Copper/copper and vinyl--coated constructionavailable as option.) Tube sheet openings shall be belled toprevent tube wear.F. Refrigerant Metering Device:Refrigerant metering device shall be of the fixed orifice feedtype.G. Filters:Filter section shall consist of field--installed, throwaway, 1--in.--thick fiberglass filters of commercially available sizes.H. Controls and Safeties:1. Unit controls shall be complete with a self--contained, low--voltage control circuit.2. Units shall incorporate an internal compressor protector thatprovides reset capability.I. Operating Characteristics:1. Unit shall be capable of starting and running at 125_F(51.6_C) ambient outdoor temperature per maximum loadcriteria of ARI Standard 240--94.2. Compressor with standard controls shall be capable ofoperation down to 40_F (4.4_C) ambient outdoortemperature in cooling mode.3. Unit shall be provided with 30--second fan time delay afterthe thermostat is satisfied.J. Electrical Requirements:All unit power wiring shall enter the unit cabinet at a single loca-tion.K. Motors:1. Compressor motors shall be of the refrigerant--cooled typewith line--break thermal and current overload protection.2. All fan motors shall have permanently lubricated bearings,and inherent, automatic reset, thermal overload protection.3. Condenser fan motor shall be totally enclosed.L. Special Features Available:1. Louvered Grille:Wire grille shall be standard on all units. Louvered grilleshall be available as a factory--installed option to provide hailguard and vandalism protection.50SZ |
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