BUILT TO LAST, EASY TO INSTALL AND SERVICE: One-piece, standard efficiency electric cooling with a low profile, prewired, tested, and charged at the factory. Field convertible from vertical to horizontal airflow on all models. No special kit required on 036 - 150 models. Field accessory supply duct kit required for 180 size model only. Full perimeter base rail with built-in rigging adapters and fork truck slots. Pre-painted exterior panels and primer-coated interior panels tested to 500 hours salt spray protection. Fully insulated cabinet. Single-stage or two stage cooling capacity control. Single or dual scroll compressor with internal line-break overload protection. All units have high and low pressure switches. Two inch disposable fiberglass type return air filters in dedicated rack with tool-less filter access door. Refrigerant circuits contain a liquid line filter drier to trap dirt and moisture. Indoor and outdoor coils constructed of aluminum fins mechanically bonded to seamless copper tubes Newly-designed indoor refrigerant header for easier maintenance and replacement. Exclusive non-corrosive composite condensate pan in accordance with ASHRAE 62 Standard, sloping design; side or center drain. Belt drive evaporator-fan motor and pulley combinations available to meet any application. Access panels with easy grip handles provide quick and easy access to the blower and blower motor, control box, and compressor. 'No-strip' screw system has superior holding power and guides screws into position while preventing the screw from stripping the unit's metal. Newly designed terminal board facilitates simple safety circuit troubleshooting and simplified control box arrangement. Outdoor temperature cooling operation range up to 115-¦F (46-¦C) and down to 40-¦F ( 4-¦C ) using winter start kit. Fixed orifice metering devices on all models to precisely control refrigerant flow. Large, laminated control wiring and power wiring drawings are affixed to unit to make troubleshooting easy. Standard, medium and high static fan motor options available. Capable of thru-the-base or thru-the-curb electrical routing. Single point electrical connections. WARRANTY 5 Year limited warranty on compressor 5 Year limited warranty on electric heater parts 1 Year limited warranty on parts