Outdoor Units

The outdoor unit transfers the heat from inside the building to the outside air.

To do this, the outdoor unit contains a...

1. Condenser- transfers the heat absorbed by the refrigerant in the evaporator to the outside air. As the condenser rejects heat, the refrigerant vapor condenses back to a warm temperature liquid before entering the expansion device and evaporator.
2. Compressor- circulates the refrigerant through the refrigeration circuit. It draws low-pressure refrigerant through the connecting pipes from the evaporator inside the building, then discharges it as high-pressure refrigerant to the outdoor condenser. The outdoor unit can serve two conventional air-handling units, or may be tied in with a full featured air-handling unit.
3. Fan- pulls air through the condenser coil, transferring heat from the condenser coil to the outside air. The use of a fan increases the efficiency of the coil without increasing its size.
4. Connecting pipes- two pipes connect the outdoor refrigeration unit to the indoor unit. The suction pipe is larger and insulated. The liquid pipe is smaller.

"Splitable" Packaged Units

Although most units ship as a factory charged, unitized package, 4-15 ton, horizontal, air cooled units can be field split. The condenser section can be placed close to the outside wall and the evaporator and blower installed near the conditioning zone. Installation is possible through standard height doorways and elevators. Refrigerant piping above the ceiling takes up less space than ductwork.

• 4-10 ton units have valves to shut off the refrigerant so that the unit can be separated.
• 12 and 15 ton units ship in two pieces.
• 5-15 ton, horizontal, water cooled units also can be separated to facilitate
  moving the units through doorways and up into the ceiling location.
• Premium units can be split due to their modular construction.