Carrier 48SS manual Durable, dependable components

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, ®eld-installed kit for propane conversion is available for all units.

Monoport inshot burners produce precise air-to-gas mixture which provides for clean and ef®cient 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.

The 48SS units meet California Air Quality Management NOx requirement of 40 nanograms/ joule or less when NOx kit

no. CRLOWNOX001A00 is installed.

Durable, dependable components

Top quality, top reliability compo- nents are designed and tested for a minimum of 15 years of operation under the harshest conditions. Every 48SS unit is thoroughly run-tested

at the factory in each operating mode, and is evacuated prior to ®nal charging.

Compressors are designed for high ef®ciency. Each compressor is her- metically 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 standard on unit sizes 024-042. Scroll compressors are standard on unit sizes 048 and 060.

Dimpled heat exchangers optimize heat transfer for improved ef®ciency. The tubular design permits hot gases to stay in close contact with the cell walls to maximize heat transfer and ef®ciency.

The induced draft combustion system eliminates the unsightly ap- pearance of ¯ue stacks, and diminishes the effects of wind on heating opera- tion. The induced draft also pre- vents contaminants from entering the supply air if a leak in the heat ex- changer occurs.

Direct-drive multispeed, PSC (permanent split capacitor) blower motor is standard on all models.

Direct-drive, PSC condenser-fan motor is 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 refrig- erant charge. Refrigerant service connections make checking operating pressures easier.

Color-coded wires permit easy trac- ing and diagnostics.

Evaporator and condenser coils are computer-designed for optimum heat transfer and cooling efficiency.

Condenser coil is fabricated of copper tube and aluminum ®ns 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 ®n coils are also available from the factory by special order. These coils are rec- ommended in applications where alu- minum ®ns 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 ®nish ensures an attractive appearance.

Optional base rails provide holes for rigging and forklifts as well as an elevated mounting frame that pro- vides structural support for horizon- tal installations. Ideal for light commercial applications.

Down¯ow option unit is converted for down¯ow at the factory to al- low vertical ductwork connections. Unit is equipped with base rail.

Low and high voltage electrical entries allow low and high voltage to be brought in through either the front duct panel or rear ¯ue panel.

Integrated gas unit controller (IGC) contains all the ignition compo- nents and is easily accessible for ser- vice. The IGC provides built-in diagnostic capabilities. A light-emitting diode (LED) simpli®es troubleshoot- ing by providing visual fault noti®- cation and system status information. The IGC board provides exclusive anti-cycle protection for gas heat operation. The IGC also contains burner control logic for dependable heating operation. The 48SS units maximize heating ef®ciency through the IGC's control of evaporator fan ON/OFF delays. The IGC helps make 48SS units reliable for years.

Weatherized cabinets are con- structed of heavy-duty, phosphated, zinc-coated prepainted steel capable of withstanding 500 hours (Federal Test Method Standard No. 141, Method 6061) in salt spray. Interior surfaces of the evaporator/heat exchanger compartment are insulated with cleanable, foil-faced insulation for improved indoor-air quality. Unit conforms to American Society of Heating, Refrigeration and Air Condi- tioning Engineers [ASHRAE]

No. 62, with use of a sloped conden- sate pan. An external drain trap is required.

The standard control system is readily adaptable to all conventional and programmable thermostats. In addition, units are suitable for integra- tion into monitor control systems if required.

Standardized components for the complete 48SS line of products are found in all safety devices, condenser- fan motors, evaporator-fan motors, and control boards, while the gas sec- tions use common inducer motors, limit switches, and rollout switches. This allows for greater inventory con- trol, familiarity of parts, and fewer stocked parts.

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