Carrier 48GS Guide User Manual download pdf (Page 2)

Energy-saving, direct spark ignition

saves gas by operating only when the

room thermostat calls for heating.

Standard units are furnished with

natural gas controls. A low-cost ﬁeld-

installed kit for propane conversion is

available for all units.

48GSN models are dedicated

Low

NOx units designed for California

installations. These models meet the

Californian maximum oxides of

nitrogen (NOx) emissions requirement

of 40 nanograms/joule or less as

shipped from the factory and

MUST

installed in California Air Quality

Management Districts where a Low

NOx rule exists.

Durable, dependable

components

Compressors

are designed for high

efﬁciency. Each compressor is

hermetically sealed against

contamination to help promote longer

life and dependable operation. Each

compressor also has vibration isolation

to provide quieter operation. All

compressors have internal high pressure

and overcurrent protection.

Monoport inshot burners

produce

precise air-to-gas mixture, which

provides for clean and efﬁcient

combustion. The large monoport on the

inshot (or injection type) burners

seldom, if ever, requires cleaning. All

gas furnace components are accessible

in one compartment.

Turbo-tubular™ heat exchangers

are

constructed of aluminized steel for

corrosion resistance and optimum heat

transfer for improved efﬁciency. The

tubular design permits hot gases to

make multiple passes across the path of

the supply air.

In addition, dimples located on the

heat exchanger walls force the hot gases

to stay in close contact with the walls,

improving heat transfer.

Direct-drive multi-speed, PSC

(permanent split capacitor) blower

motor

is standard on all 48GS models.

Direct-drive, PSC condenser-fan

motors

are designed to help reduce

energy consumption and provide for

cooling operation down to 55°F outdoor

temperature. Motormaster® II low

ambient kit is available as a ﬁeld-

installed accessory.

Refrigerant system

is designed to

provide dependability. Liquid refrigerant

strainers are used to promote clean,

unrestricted operation. Each unit leaves

the factory with a full refrigerant charge.

Refrigerant service connections make

checking operating pressures easier.

Evaporator and condenser coils

are

computer-designed for optimum heat

transfer and cooling efﬁciency. The

evaporator coil is fabricated from copper

tube and aluminum ﬁns and is located

inside the unit for protection against

damage. The condenser coil is internally

mounted on the top tier of the unit. A

FIOP (Factory-Installed Option) metal

louvered grille is available on all models.

Copper ﬁn coils and pre-coated ﬁn coils

are available from the factory by special

order. These coils are recommended in

applications where aluminum ﬁns are

likely to be damaged due to corrosion.

They are ideal for seacoast applications.

Low sound ratings

ensure a quiet indoor

and outdoor environment with sound

ratings as low as 7.5 bels.

(See ARI capacity charts for individual

valves.)

Easy to service cabinets

provide easy

single-panel accessibility to serviceable

components during maintenance and

installation. The basepan with

integrated drain pan provides easy

ground level installation with or without

a mounting pad. Convenient handholds

are provided to manipulate the unit on

the jobsite. A nesting feature ensures a

positive basepan to roof curb seal when

the unit is roof mounted. A convenient

3/4-in. wide perimeter ﬂange makes

frame mounting on a rooftop easy.

Downﬂow operation

is easily provided

in the ﬁeld to allow vertical ductwork

connections. The basepan utilizes

knockout style seals on the bottom

openings to ensure a positive seal in the

horizontal airﬂow mode.

Integrated Gas Control (IGC) board

provides safe and efﬁcient control of

heating and simpliﬁes trouble-shooting

through its built-in diagnostic function.

Cabinets

are constructed of heavy-

duty, phosphated, zinc-coated

prepainted steel capable of

withstanding 500 hours in salt spray.

Interior surfaces of the evaporator/heat

exchanger compartment are insulated

with cleanable semi-rigid insulation

board, which keeps the conditioned air

from being affected by the outdoor

ambient temperature and provides

improved indoor air quality. (Conforms

to American Society of Heating,

Refrigeration and Air Conditioning

Engineers No. 62P.) The sloped drain

pan minimizes standing water in the

drain. An external drain is provided.

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Carrier 48GS Guide User Manual Page 2

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