Patent ID: 7681630

Claim:
An HVAC system for work vehicle having an operator compartment for a vehicle operator, the system comprising: an air-conditioning system having an evaporator coil; an operator compartment pressurizer blower; an electronic circuit coupled to both the air-conditioning system and the pressurizer blower, wherein the circuit is configured to reduce the pressurizer blower when the operator selects a high output configuration of the air-conditioning system and, wherein high output configuration is achieved by at least the evaporator coil operating at the lower of at least two temperature settings of the system, and wherein the pressurized blower air intake is configured to remain open while under high output and provide positive cab pressurization; a manually operable temperature control for selecting among a plurality of achievable system temperatures, wherein the control is coupled to the electronic circuit; and wherein the high output configuration is selectable once the HVAC system has been placed in an automatic mode by only manual operation of the temperature control to the lowest temperature of the plurality of achievable system temperatures, and when in the high output configuration in the automatic mode the electronic circuit is configured to increase a recirculation blower speed.