Carrier 50XP Guide Specifications, Packaged Electric Cooling Unit, Constant Volume Application

GUIDE SPECIFICATIONS

Packaged Electric Cooling Unit

Constant Volume Application

HVAC Guide Specifications

Size Range:	2 to 5 Tons, Nominal Cooling
Model Number: 50XP
Part 1 — General
SYSTEM DESCRIPTION

Outdoor rooftop mounted or ground mounted, electric cooling unit utilizing a hermetic compressor for cooling duty and optional electric heating. Unit shall discharge supply air vertically or horizontally as shown on contract drawings. Condenser fan/coil section shall have a draw-thru design with vertical discharge 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 recommendations.

Part 2 — Products

EQUIPMENT

A. General:

Factory-assembled, single-piece, cooling unit. Contained within the enclosure shall be all factory wiring, piping, controls, refrigerant charge with R-410A refrigerant, and special features required prior to field start-up.

B.Unit Cabinet:

1.Unit cabinet shall be constructed of phosphated, zinc-coated, pre-painted steel capable of with-standing 500 hours in 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.Evaporator 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 evaporator wall sections will be insulated with a minimum semi-rigid foil-faced board ca- pable 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 evaporator fan shall be direct-drive variable speed motor and control, as shown on equipment drawings.

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

3.Condenser fan shall be direct drive propeller type with alu- minum blades riveted to corrosion resistant steel spiders, be dynamically balanced, and discharge air vertically.

D.Compressor:

1.Fully hermetic compressors with factory-installed vibration isolation.

2.Scroll compressors shall be standard on all units.

E.Coils:

Evaporator and condenser coils shall have aluminum plate fins mechanically bonded to seamless copper tubes with all joints brazed. (Copper/copper and vinyl-coated construction available as option). Tube sheet openings shall be belled to prevent tube wear.

F. Refrigerant Components:

Refrigerant expansion device shall be of the TXV (thermostatic expansion valve) type.

G. Filters:

Filter section shall consist of field-installed, throwaway, 1-in. (25 mm) 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 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_C) ambient outdoor temperature,exceeding maximum load criteria of ARI Standard 210.

2.Compressor with standard controls shall be capable of op- eration down to 55_F (13_C) ambient outdoor temperature.

3.Indoor Fan on/off delay profile is selected (for cooling) on the Easy Select board.

J.Electrical Requirements:

All unit power wiring shall enter the 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.Condenser fan motor shall be totally enclosed.

L.Grille:

1.Louvered Grille:

Louvered grille shall be standard on all units.

50XP

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