Abstract: A control system for a refrigeration unit is disclosed. The control system may include a user interface, an interface bus, a power control module, a first module, and a second module. The interface bus may communicatively couple the user interface, the power control module, the first module, and the second module. The user interface may be capable of receiving and dispatching information. The power control module may be capable of distributing and monitoring power to the control system. The second module may have at least one connector with flexible input and output configuration capabilities. The first module may have a controller and at least one connector with flexible input and output configuration capabilities.

Abstract: Programmable system and process are disclosed for adapting a generally written HVAC control program to a number of different HVAC systems. The system and process include a separate interface to the control program and a separate interface to the control elements of each particular HVAC system. Configuration data for the particular HVAC system defines the relationship between software variables of the control program and the control elements of the particular HVAC system. The configuration data is utilized when information is to be transferred between the interfaces.

Abstract: A variable air volume control system has a temperature system management device which calculates an air flow setpoint in a temperature zone as a function of a proportional term that accommodates gross temperature-setpoint errors, and integral term that provides heating or cooling load matching, and a derivative term that accommodates rapid fluctuations in the cooling or heating load, and communicates the flow setpoint to a terminal control unit to adjust the air flow to a space. The terminal control unit will implement a flow setpoint as a function of the gross error in temperature in the space and a default temperature comfort setpoint upon failure of the temperature system management device to maintain a temperature in the zone.

Abstract: A method and apparatus for controlling and measuring the amount of conditioned air flowing through an air terminal to a conditioned space for adjusting the space temperature to a desired temperature.

Abstract: An air terminal flow detection scheme in an air distribution system effective for developing static pressure indications of the plenum of the air terminal from change in the flow through the air terminal over the period of time of the change.

Abstract: An air terminal adjustment method to achieve an air flow setpoint wherein the time to achieve the setpoint is determined by calculating the difference between the flow setpoint and an actual flow and then dividing the difference by a change in flow per unit time. The time to achieve the setpoint adapts to changes in static pressure in the air terminal.