Carrier manual Guide Specifications, Model Number 50XT Part I General

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GUIDE SPECIFICATIONS

SINGLE-PACKAGED HEAT PUMP UNITS

CONSTANT VOLUME APPLICATION

HVAC GUIDE SPECIFICATIONS

SIZE RANGE: 2 TO 5 TONS, NOMINAL (COOLING)

MODEL NUMBER: 50XT

PART I - GENERAL

SYSTEM DESCRIPTION

Outdoor rooftop or ground mounted heat pump unit utilizing a hermetic, 2-stage scroll compressor for heating and cooling duty and optional electric heating. Unit shall discharge supply air ver- tically or horizontally as shown on contract drawings. Outdoor fan/coil section shall have a draw-thru design with vertical dis- charge for minimum sound levels.

QUALITY ASSURANCE

A. Unit shall be rated in accordance with ARI Standards 210/240 and 270.

B. Unit shall be designed in accordance with UL Standard 1995.

C.Unit shall be manufactured in a facility registered to ISO 9001 manufacturing quality standard

D.Unit shall be UL listed and c-UL certified as a total package for safety requirements.

E.Roof curb shall be designed to conform to NRCA Standards.

F.Insulation and adhesives shall meet NFPA 90A requirements for flame spread and smoke generation.

G.Cabinet insulation shall meet ASHRAE Standard 62P.

DELIVERY, STORAGE, AND HANDLING

Unit shall be stored and handled per manufacturer’s recommen- dations.

PART 2- PRODUCTS

EQUIPMENT

A. General:

Factory-assembled, single-piece, heat pump. Contained within the unit enclosure shall be all factory wiring, piping, controls, re- frigerant charge (R-410A), and special features required prior to field start-up.

B.Unit Cabinet:

1.Unit cabinet shall be constructed of phosphated, zinc-coated, prepainted steel capable of withstanding 500 hrs of salt spray.

2.Normal service shall be through a single removable cabinet panel.

3.The unit shall be constructed on a rust proof unit base that has an externally trapped, integrated sloped drain pan.

4.Indoor fan compartment top surface shall be insulated with a

minimum 1/2-in. (13 mm) thick, flexible fiberglass insulation, coated on the air side and retained by adhesive and mechanical means. The indoor wall sections will be insulated with a foil-faced insulation capable of being wiped clean. Aluminum foil-faced fiberglass insulation shall be used in the entire indoor air cavity section.

5.Unit shall have a field-supplied condensate trap.

C.Fans:

1.The indoor fan shall be variable-speed motor and control, as shown on equipment drawings.

2.Fan wheel shall be made from steel, be double-inlet type. It shall have forward-curved blades with a corrosion-resistant finish and shall be dynamically balanced.

3.Outdoor fan shall be of the direct-driven propeller type with aluminum blades, riveted to corrosion-resistant steel spiders. It shall be dynamically balanced, and discharge air vertically.

D.Compressor:

1.Fully hermetic, 2-stage scroll compressors with factory-installed vibration isolation.

2.Scroll compressors shall be standard on all units.

3.Compressor Protection:

Defrost control shall protect compressor by preventing “short cycling.”

E.Coils:

1.Indoor and outdoor coils shall have aluminum plate fins mechanically bonded to seamless copper tubes with all joints brazed.

2.Tube sheet openings shall be bellied to prevent tube wear.

F.Refrigerant Metering Device:

Refrigerant metering device shall be of the single body, fixed orifice feed type (outdoor) and TXV (indoor).

G.Filters:

Filter section shall consist of field-installed, throw-away, 1-in. thick fiberglass filters of commercially available sizes.

H.Controls and Safeties:

1.Unit controls shall be complete with self-contained low voltage control circuit.

2.Units shall incorporate an internal compressor protector that provides reset capability.

3.Unit shall provide high- and low-/loss-of-charge pressure safety protection.

I.Operating Characteristics:

1.Unit shall be capable of starting and running at 125°F (51.6_C) ambient outdoor temperature, exceeding maximum load criteria of ARI Standard 240.

2.Compressor shall be capable of operation down to 55°F (12.7_C) ambient outdoor temperature in cooling and -10°F in heating.

3.Unit shall be capable of low-ambient cooling (below 55_F (12.7_C) ambient outdoor temperature) with low-ambient cooling enabled on the UI.

J.Electrical Requirements:

All unit power wiring shall enter unit cabinet at a single location.

K.Motors:

1.Compressor motors shall be of the refrigerant-cooled type with line-break thermal and current overload protection.

2.All fan motors shall have permanently lubricated bearings and inherent automatic-reset thermal overload protection.

3.Outdoor fan motor shall be totally enclosed.

L.Grille

1.Louvered Grille:

Louvered grille shall be standard on all units.

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Contents FEATURES/BENEFITS Product DataTable of Contents Model Number Nomenclature ARI* CapacitiesPhysical Data Unit SizeOptions and Accessories Factory-installed optionsFilter Rack Manual Outside AIR Damper50XT024-030 Unit Dimensions 50XT036-060 Unit Dimensions Accessory Dimensions No TE aSelection Procedure 50XT Suggested RiggingGiven Performance DATA-STANDARD ECM Indoor Motor Cooling Extended Performance Table50XT024 High Cool 50XT024 Low CoolHeating Capacity 50XT024 High 50XT024 High Con’tHeating Capacity 50XT024 Low 50XT024 Low Con’t50XT030 High Cool 50XT030 Low CoolTotal Sens 875 1000Heating Capacity 50XT030 High 50XT030 High Con’tHeating Capacity 50XT030 Low 50XT030 Low Con’t50XT036 High Cool 50XT036 Low CoolHeating Capacity 50XT036 High 50XT036 High Con’tHeating Capacity 50XT036 Low 50XT036 Low Con’t50XT042 High Cool 50XT042 Low CoolHeating Capacity 50XT042 High 50XT042 High Con’tHeating Capacity 50XT042 Low 50XT042 Low Con’t50XT048 High Cool 50XT048 Low Cool1600 965Heating Capacity 50XT048 High 50XT048 High Con’t15.6 21.1Heating Capacity 50XT048 Low 50XT048 Low Con’t50XT060 High Cool 50XT060 Low Cool2000 1750Heating Capacity 50XT060 High 50XT060 High Con’tHeating Capacity 50XT060 Low 50XT060 Low Con’tPerformance Data Multiplication FactorsWet coil air delivery low stage Typical Piping and Wiring Application Data Electrical Data PH-HZ Range FLA Nominal MCA Mocp MIN MAX RLA LRATypical Wiring Schematic Controls Sequence of OperationGuide Specifications Model Number 50XT Part I GeneralSpecial Features Catalog No 50XT---04PD

50XT specifications

The Carrier 50XT series represents a significant advancement in commercial rooftop air conditioning systems, delivering robust performance and energy efficiency for a variety of applications. Designed primarily for light commercial buildings, these units are a preferred choice for their reliability and advanced features.

One of the standout features of the Carrier 50XT is its energy efficiency. The system boasts a high Seasonal Energy Efficiency Ratio (SEER), which translates to reduced operational costs and a lower environmental impact. This efficiency is further enhanced by the use of variable speed scroll compressors, which adjust their speed based on the cooling demand, ensuring optimal performance while consuming less energy.

The 50XT series is equipped with an advanced microprocessor control system that allows for precise management of the unit’s operations. This smart technology facilitates easy integration with building management systems, enabling real-time monitoring and control. Additionally, the control system provides diagnostic capabilities, making maintenance and troubleshooting more straightforward and efficient.

The unit also features an innovative air distribution system that enhances indoor air quality. With the inclusion of advanced filtration options, the Carrier 50XT effectively reduces airborne pollutants and allergens, contributing to a healthier indoor environment. The design ensures optimized airflow and temperature control, making it suitable for a wide range of commercial settings.

Durability is another hallmark of the Carrier 50XT, which is constructed with robust materials resists corrosion and ensures a long operational life. The units are designed to withstand harsh environmental conditions, making them a reliable choice for various climates.

Furthermore, the Carrier 50XT series supports various refrigerants, including R-410A, which is known for its lower environmental footprint. This adaptability not only meets current regulatory standards but also positions the units as forward-thinking solutions for the evolving landscape of HVAC technology.

In conclusion, the Carrier 50XT series combines cutting-edge technology, energy efficiency, and durability, making it an ideal choice for light commercial applications. With features designed to enhance performance and comfort, as well as environmentally responsible operation, the 50XT units stand out as a smart investment for any commercial building.
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