Carrier 48SS - Manual (Page 2)

Energy-saving, direct-spark igni­
tion
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 con­
version is available for all units
Model 48SS units meet the
California maximum oxides of nitrogen
(NOx) emission requirements
Durable, dependable compo­
nents
Compressors
are designed for high
efficiency Each compressor is hermeti­
cally sealed against contamination to
help promote longer life and de­
pendable operation. Each compressor
also has vibration isolation to pro­
vide quiet operation All compressors
have internal high-pressure and
overcurrent protection Rotary com­
pressors are standard on unit size 018
Reciprocating compressors are stan­
dard on unit sizes 024-042. Scroll
compressors are standard on unit sizes
048 and 060
Monoport inshot burners
produce
precise air-to-gas mixture which
provides for clean and efficient com­
bustion The large monoport on the
inshot (or injection type) burners
seldom, if ever, needs 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 multispeed, PSC
(permanent split capacitor) blower
motor is standard on all models.
Direct-drive, PSC condenser-fan
motors
are designed to help reduce
energy consumption and provide
for cooling operation down to 40 F
outdoor temperature
Refrigerant system
is designed to
provide dependability Liquid refriger­
ant strainers are used to promote
clean, unrestricted operation. Each
unit leaves the factory with a full
refrigerant charge. Refrigerant service
connections make checking operat­
ing pressures easier.
Evaporator and condenser coils
are computer-designed for optimum
heat transfer and cooling efficiency
Condenser coil is fabricated of copper
tube and aluminum fins and is lo­
cated inside the unit for protection
against damage for long life and reli­
able operation The condenser coil
is internally mounted and protected by
a composite grille. Copper fin coils
are also available from the factory by
special order. These coils are rec­
ommended in applications where alu­
minum fins are likely to be damaged
due to corrosion and are ideal for sea-
coast applications
Low sound ratings
ensure a quiet
indoor and outdoor environment with
sound ratings as low as 7 4 bels
Easy to service cabinets
provide
easy accessibility to serviceable com­
ponents during maintenance and
installation Rounded corners are an
important safety feature, and a high
quality finish ensures an attractive
appearance
Optional base rails
provide holes
for rigging and handling as well as an
elevated mounting frame that provides
structural support for horizontal
installations.
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Features/Benefits .
Model Number Nomenclature
ARI Capacities .....................
Physical Data
Options and Accessories
Base Unit Dimensions
Accessory Dimensions
Selection Procedure .............
Performance Data
Typical Installation
Application Data.........................
Typical Control Wiring Schematic
Electrical Data
Sequence of Operation
Guide Specifications
Downflow option unit is converted
for downflow at the factory to al­
low vertical ductwork connections
Unit is equipped with base rail.
Low and bigb voltage electrical
entries
allow low and high voltage to
be brought in through either the
front duct panel or rear flue panel
Integrated gas control board pro­
vides safe and efficient control of heat­
ing and simplifies troubleshooting
through its built-in diagnostic function
Weatberized cabinets
are con­
structed 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
to help keep the conditioned air
from being affected by the outdoor
ambient temperature and to provide
improved air quality. (Conforms to
American Society of Heating,
Refrigeration and Air Conditioning
Engineers [ASHRAE] No. 62P ) Sloped
condensate pan permits an external
drain
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