Abstract: A microprocessor controlled vehicle relay for high capacity HVAC systems in large high occupancy vehicles is provided that can be configured in different ways to provide a number of operational functions for improved safety as well as greater motor and/or compressor longevity.

Abstract: An electronic climate control system is provided for controlling an HVAC system on a bus or other high-occupancy vehicle either as a stand-alone system or for retrofitting with existing HVAC equipment. The system includes a system control unit having output terminals connected to the vehicle compressor, condenser and evaporator units for control thereof, as well as a user control unit electrically coupled to the system control unit for receiving user inputs. The user control unit includes one or two switches, each sized to fit with an adaptable housing into standard rocker switch blanks of varying sizes in a bus control panel. These highly integrated switches, which are programmable and can support system control units of varying complexity, are easy to install and use, and provide multi-function capability including dynamic temperature and diagnostic outputs.

Abstract: An air conditioning unit having a flush-mounted self-contained evaporator assembly adapted for mounting into the front or rear bulkhead of a bus or similar type vehicle. The evaporator assembly includes a specially designed housing to provide a compact self-contained unit that can fit in a small space, such as the bulkhead above a passenger compartment, while the associated compressor and condenser units are distally located. The housing has chamfered top surfaces so as to provide additional clearance within the bulkhead during installation, and a floor pan with two sloping surfaces forming an inverted apex. Lateral drains located at both ends of the apex facilitate drainage of condensate from the unit when the vehicle is in motion or in a non-level stationary position.

Abstract: A self-contained electrical heat pump heating, ventilating and air conditioning unit (HVAC) adapted for mounting at the rear of a bus or other similarly large transport vehicle. The HVAC unit is unitary in construction, compactly arranged and provided with an integrated heat pump. The HVAC unit is specially constructed for use with electric buses or electric/hybrid buses, but can also be adapted for use on buses powered by internal combustion engines.

Abstract: A heating, ventilating and air conditioning unit adapted for mounting on the roof of a bus or similar vehicle. The HVAC unit is self-contained, lightweight and provides adequate cooling, heating and ventilation to a bus passenger compartment or the occupant compartment of a similar vehicle. The HVAC unit has a unique cross-pattern arrangement of evaporator and condenser assemblies which enables air distribution from the system to function in a ducted system or a free blow system depending upon orientation of the condensers and evaporators. The HVAC unit is of compact construction and includes modular characteristics provided by the allocation of one fan to one condenser and one blower to one evaporator to enhance system performance and system redundancy. The HVAC units include diagonal symmetry of components which further improves modularity, commonality and serviceability.