Patent ID: 8151583
Filing Date: 2012-04-10
Classification: F25B,Y02B

Abstract:
1. A method of controlling an expansion valve of a residential HVAC system, comprising: in response to at least one of a call for cooling and a call for heating, controlling the expansion valve to achieve a first predetermined position, wherein the controlling is achieved without respect to a superheat of the HVAC system occurring substantially contemporaneously with the controlling; wherein the first predetermined position is a predetermined percentage greater than a previous position of the expansion valve achieved (1) during operation of the expansion valve in response to at least one of a previous call for cooling and a previous call for heating and (2) during control of the expansion valve as a function of the superheat of the HVAC system occurring substantially contemporaneously with the at least one of the previous call for cooling and the previous call for heating, and wherein the predetermined percentage is the product of multiplying a substantially constant multiplying factor against the previous position of the expansion valve; and after achieving the first predetermined position, controlling the expansion valve according to a weighted function that increasingly depends upon a function of a substantially contemporaneous superheat of the HVAC system.