Carrier 50ZH Product Data

Also see for 50ZH024: Installation, Start-Up and Service Instructions Installation instructions

Contents

Guide specificationsPackaged Rooftop Air-to-Air Heat PumpConstant Volume ApplicationHVAC Guide SpecificationsSize Range: 2 to 5 Tons, Nominal (Cooling)21,000 to 52,500 Btuh, Nominal(Heating)Carrier Model Number: 50ZHPart 1 — General1.01 SYSTEM DESCRIPTIONOutdoor package, electrically controlled, air-to-air heatpump utilizing a scroll compressor for heating andcooling duty. Unit shall discharge supply air horizon-tally as shown on contract drawings.1.02 QUALITY ASSURANCEA. Unit shall be rated in accordance with ARI Standards210/240-89, and 270-84. Designed in accordancewith UL Standard 1995.B. Unit shall be designed to conform to ASHRAE 15.C. Unit shall be UL listed as a total package for safetyrequirements.D. Insulation and adhesive shall meet NFPA 90A require-ments for flame spread and smoke generation.1.03 DELIVERY, STORAGE, AND HANDLINGUnit shall be stored and handled per manufacturer’srecommendations.Part 2 — Products2.01 EQUIPMENTA. General:Factory-assembled, single piece, air-to-air heat pump.Contained within the unit enclosure shall be all fac-tory wiring, piping, controls, and refrigerant charge(R-22).B. Unit Cabinet:1. Unit cabinet shall be constructed of phosphated,bonderized, zinc-coated, prepainted steel.2. Basepan shall be made of a single-piece non-corrosive, composite material.3. Indoor fan compartment cabinet surfaces shall beinsulated with a minimum 1⁄2 in. thick, flexible in-sulation, coated on the air side, with aluminum foil-faced insulation.4. Cabinet panels shall be easily removable forservicing.5. Unit shall have a factory-installed, sloped, non-corrosive, condensate drain.6. Unit insulation conforms to ASHRAE 62P.C. Fans:1. Indoor Blower (Indoor Fan):a. Fan shall be 2- or 3-speed, direct drive asshown on the equipment drawings.b. Fan wheel shall be made from steel, be double-inlet type. It shall have forward-curved bladeswith a corrosion-resistant finish and shall bedynamically balanced.2. Outdoor fan shall be of the direct-driven pro-peller type with aluminum blades, riveted tocorrosion-resistant steel spiders. It shall be dynami-cally balanced, and shall discharge air upwards.D. Compressor:Fully hermetic scroll, type with internal and externalvibration isolation.E. Coils:1. Indoor and outdoor coils shall have aluminum-plate fins mechanically bonded to seamless cop-per tubes with all joints brazed.2. Tube sheet openings shall be belled to prevent tubewear.3. Outdoor coil shall be protected by metal louveredpanels.F. Refrigerant Components:1. Fixed orifice feed system.2. Service gage connections on suction, discharge andliquid lines.3. Equipped with liquid line strainers.4. Equipped with liquid line loss of charge switch.G. Controls and Safeties:1. Unit Controls:a. Unit shall be complete with self-contained low-voltage control circuit.b. Defrost board is equipped with 5 minute com-pressor time delay protection.c. Unit shall incorporate an outdoor-coil defrostsystem to prevent excessive frost accumula-tion during heating duty, and shall be con-trolled as follows:1) Defrost shall be initiated on the basis oftime and coil temperature.2) A 30/50/90 minute timer shall activatedefrost cycle only if coil temperature islow enough to indicate a heavy frostcondition.3) Defrost cycle shall terminate when de-frost thermostat is satisfied or shall have apositive termination time of 10 minutes.2. Safeties:Compressor, overtemperature, overcurrent.H. Operating Characteristics:1. Unit shall be capable of starting and running at125 F ambient outdoor temperature per maxi-mum load criteria of ARI Standard 240-89.2. Compressor with standard controls shall be ca-pable of operation down to 40 F ambient outdoortemperature in cooling duty.3. Compressor shall be capable of operation in heat-ing duty down to –20 F ambient outdoor-airtemperature.4. Unit shall be capable of simultaneous heating dutyand defrost cycle operation when using electricheaters indicated in Section K, Special Features.5. Compressors will be prevented from restarting fora minimum of 5 minutes after shutdown.21

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