Patent ID: 6763677
Filing Date: 2004-07-20
Classification: B60H,F24F,F25D

Abstract:
A refrigeration container unit including a cargo container having an interior and a refrigeration unit for conditioning and circulating air in said cargo container, said refrigeration unit including an evaporator fan located upstream of an evaporator and a microprocessor for controlling and recording conditions in said cargo container, said container unit further including:said fan producing a suction pressure upstream thereof and a discharge pressure downstream thereof; manually operated means for simultaneously controlling all positions between closed and fully open of two flow paths between said interior of said cargo container and ambient atmosphere surrounding said cargo container; a first one of said two flow paths is for supplying atmospheric air to air circulating in said cargo container and extends from a point which is just upstream of said fan and which is at suction pressure and said ambient atmosphere whereby atmospheric air is supplied to circulating air; a second one of said two flow paths is for discharging circulating air from said cargo container to said ambient atmosphere and extends to said ambient atmosphere from a point which is just downstream of said fan and which is at discharge pressure; means for sensing all positions of said manually operated means; and means for continuously providing a signal to said microprocessor indicative of the sensed position sensed by said means for sensing when said manually operated means is in any position and for recording the sensed positions by said microprocessor.