Patent ID: 6886358

Claim:
A bus air conditioning system with at least one air conditioning module installed on a bus roof having a pair of supply air openings for conducting the flow of conditioned air downwardly near the outer side of the roof and a return air duct whose position can vary substantially in the lateral direction from a longitudinal central axis of the bus for any given installation, comprising: a refrigeration circuit for circulating refrigerant serially through a compressor, a condenser coil, an expansion valve and an evaporator coil; an evaporator section including an evaporator blower for causing return air to flow from said return air duct, into a return air opening of said evaporator section, through said evaporator coil and then to said supply air opening; and a condenser fan for causing outside air to flow over said condenser coil and then to be discharged outside; wherein said evaporator return air opening extends over a substantially greater lateral width than said return air duct such that when said module is in its installed position on the roof, said evaporator return air opening is disposed directly above and fluidly communicates with the return air duct of the bus even though the lateral position of said return air duct can vary from one installation to another.