Carrier 48GS Guide User Manual download pdf (Page 25)

Packaged Heating/Cooling Units

Constant Volume Application

HVAC Guide Specifications

Size Range: 1-1/2 to 5 Tons, Nominal Cooling

40,000 to 130,000 Btuh,

Nominal Heating Input

Carrier Model Number: 48GS

Part 1 — General

SYSTEM DESCRIPTION

Outdoor rooftop mounted, gas heating/electric cooling unit

utilizing a hermetic compressor for cooling duty. 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

210-89 and 270-89.

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 CSA 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, heating and cooling

unit. Contained within the enclosure shall be all factory

wiring, piping, controls, refrigerant chage (R-22), 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

basepan that has an externally trapped, integrated

sloped drain pan.

4. Evaporator fan compartment top surface shall be

insulated with a minimum 1/2-in. 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 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 evaporator fan shall be 3-speed, direct-drive, 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 and be dynamically balanced.

3. Condenser fan shall be direct drive propeller type

with aluminum 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. Reciprocating and/or scroll compressors shall be

standard on all units.

E. Coils:

Evaporator and consdensor coils shall have aluminum

plate fins mechanically bonded to seamless copper

tubes with all joints brazed (copper/copper and vinyl-

coated construction available as factory-installed

option). Tube sheet openings shall be belled to prevent

tube wear.

F. Heating Section:

1. Induced-draft combustion type with energy saving

direct spark ignition system and redundant main gas

valve.

2. Induced-draft motors shall be provided with solid-

state hall-effect sensor to ensure adequate airflow

for combustion.

3. The heat exchangers shall be constructed of

aluminized steel for corrosion resistance.

4. Burners shall be of the in-shot type constructed of

aluminum coated steel.

5. All gas piping and electric power shall enter the unit

cabinet at a single location.

G. Refrigerant Components:

Refrigerant components shall be of the fixed orifice

feed type.

H. Filter section shall consist of field-installed,

throwaway, 1-in. thick fiberglass filters of com-

mercially available sizes.

I. Controls and Safeties:

1. Unit controls shall be complete with a self-

contained low voltage control circuit.

2. Safeties: compressors shall incorporate a solid-state

compressor protector that provides reset capability.

J. Operating Characteristics:

1. Unit shall be capable of starting and running at

125°F ambient outdoor temperature per maximum

load criteria of ARI Standard 210.

Guide specifications

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Carrier 48GS Guide User Manual Page 25

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