초록 ▼

A control system and method for space temperature regulating equipment are disclosed in which mechanical cooling equipment is controlled as a function of sensed space temperature and a first temperature set point; and an economizer for admitting low enthalpy outside air is controlled as a function o

A control system and method for space temperature regulating equipment are disclosed in which mechanical cooling equipment is controlled as a function of sensed space temperature and a first temperature set point; and an economizer for admitting low enthalpy outside air is controlled as a function of sensed space temperature and a second temperature set point independent of the first temperature set point.

대표청구항 ▼

Thermostat apparatus for a system for controlling temperature in an air conditioned space by means of mechanical temperature changing equipment and an economizer for admitting outside air, said thermostat apparatus comprising: a temperature sensor for sensing a temperature in the air conditioned spa

Thermostat apparatus for a system for controlling temperature in an air conditioned space by means of mechanical temperature changing equipment and an economizer for admitting outside air, said thermostat apparatus comprising: a temperature sensor for sensing a temperature in the air conditioned space; first set point means for establishing a first temperature set point; an enthalpy sensor for sensing enthalpy of the outside air; second set point means for establishing a second temperature set point substantially independent of the first temperature set point; a discharge air temperature sensor for sensing the temperature of air discharged into the air conditioned space; and controller means for controlling operation of the mechanical temperature changing equipment as the function of the temperature in the air conditioned space and the first temperature set point, and controlling operation of the economizer as a function of the temperature in the air conditioned space, the air discharged into the air conditioned space and the second temperature set point when the enthalpy of the outside air is lower than a predetermined value, said controller means maintaining said economizer closed when the enthalpy of the outside air is higher than the predetermined value.