Electronic capacity control or direct expansion refrigeration of air conditioning systems
Patent 3973618 Issued on August 10, 1976. Estimated Expiration Date: 
August 10, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 10, 1993. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3692100 3745778 InventorsAssigneeApplicationNo. 536055 filed on 12/24/1974US Classes:165/256, Variable rate of heating or cooling (e.g., plural stages, etc.)165/202, Vehicle installation165/255, Dead band between heating and cooling165/290, Temperature sensor within or near an area to be conditioned, another tempeerature sensor near the conditioning equipment (e.g., shallow/deep, etc.)165/293, Temperature sensor prior to heat exchanger and one after236/75, Reciprocating or oscillating62/213, Alternative or selective sensors62/223By external conditionExaminersPrimary: Wayner, William E.Attorney, Agent or FirmAbstractThe invention relates to the air conditioning of a storage compartment and is especially significant for a transport system. Air is circulated between an air tempering zone and the storage compartment, said air tempering zone having air cooling means and air heating means controlled by a thermostat. The thermostat has a wide range set point and depending upon what set point is selected, the thermostat is responsive either to the temperature of the air discharged from the tempering zone or the temperature of the air returning to said zone. When the set point is above a given point and the air is being cooled to near the desired temperature, said desired temperature is accurately obtained by the thermostat first sending a signal from a selected one of the two sensors that provides a step-reduction in the capacity of the cooling means and then sending a signal to a modulating valve that further reduces to the set point the capacity of the cooling means by a modulation reduction. | |
