Abstract: Disclosed is an improved variable refrigerant flow (VRF) air conditioning (AC) unit that eliminates the need to run refrigerant lines into the spaces being cooled or heated while providing the benefits and energy savings of a VRF system. Suitably, the disclosed VRF AC system can connects multiple condensate drain pans via one pipe then uses gravity to drain condensation from the condenser coils. Further disclosed is a VRF AC system that provides the required minimum outside air as an integral part of the system. Finally, disclosed may be a VRF AC system that has an economizer to use outside air to cool inside air if the outside air temperature is lower than the inside air temperature.

Abstract: Disclosed is an improved variable refrigerant flow (VRF) air conditioning (AC) unit that eliminates the need to run refrigerant lines into the spaces being cooled or heated while providing the benefits and energy savings of a VRF system. Suitably, the disclosed VRF AC system can connects multiple condensate drain pans via one pipe then uses gravity to drain condensation from the condenser coils. Further disclosed is a VRF AC system that provides the required minimum outside air as an integral part of the system. Finally, disclosed may be a VRF AC system that has an economizer to use outside air to cool inside air if the outside air temperature is lower than the inside air temperature.