The outdoor unit transfers the heat from inside the building to the outside air.
To do this, the outdoor unit contains a...
- 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.
- 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.
- 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.
- 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.
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