US 4,386,649 A · Programmable thermostatic control device

Abstract

A programmable thermostatic control device for controlling the temperature within a preselected zone of an enclosed environment. The device can be readily installed and utilizes an interface unit through which the heating, ventilation and cooling system of a building and/or residence are connected to the device outputs. An operator is guided through the programming of the device by cueing or prompting lights which sequentially indicate the information to be entered on the keypad. The device is processor-based and controls the heating and cooling systems to maintain a preselected temperature range, and to establish a preselected temperature within the controlled zone at a predetermined time. The temperature within the control zone is established and/or maintained with maximum efficiency by controlling the stage and duration of energization of the heating and air conditioning units. To this end, means are provided for determining and continuously updating the recovery time necessary for establishing a preselected temperature, and utilizing this information to control the HVAC units.

A programmable thermostatic control device for controlling a temperature within a preselected mode of an enclosed environment by selective operation of the heating, ventilation and air conditioning system sections, said device comprising:

a power supply for maintaining a regulated voltage, said power supply including a DC voltage regulator and a AC signal generator, said AC signal generator, serving to generate a signal which is superimposed upon the signal generated by said DC voltage regulator;
a temperature monitor for determining the existing temperature within the control zone ambient said device, said temperature monitor comprising circuitry for determining said ambient temperature through successive approximations and supplying said temperature information at its output in the form of an electronic signal;
heating, ventilation and air conditioning controls for selectively providing and output signal used in controlling the heating, ventilation and air conditioning systems response to the plurality of input signals, said heating, ventilation and air conditioning controls including AND gates which are provided at their respective inputs, with first signals indicating the enablement condition of preselected sections of the heating, ventilation and air conditioning system and further signals;
processing means for controlling said heating, ventilation and air conditioning controls and including memory means for storing operating instructions, said memory means including a permanent memory including a plurality of subroutines and a programmable memory which enters and loads information entered by the user together with information supplied by the temperature monitor, said processor means supplying said further signals to the input of said heating, ventilation and air conditioning controls indicating whether said processor means is directing the various sections of the heating, ventilation and air conditioning system to be turned on, said heating, ventilation and air conditioning controls providing signals at its output for energizing selected sections of the heating, ventilation and air conditioning system only upon signals being supplied at its input indicating that a preselected section of the heating, ventilation and air conditioning system is enabled and being commanded to operate by processor means;
means operably connected to said processing means for entering and loading instructions and temperature information for controlling the operation said processing means;
display means operably connected to said processing means for selectively providing a visual readout of selected information concerning the operation of said device;
further display means operably connected to said processing means for cueing the operator during the operation of entering and loading instructions for said processing means;
and
an interface unit serially connected between said heating, ventilation and air conditioning control and said heating, ventilation and air conditioning system, said interface unit selectively applying power to preselected sections said heating, ventilation and air conditioning system responsive to predetermined input signal being received from said heating, ventilation and air conditioning controls.

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Programmable thermostatic control device

Life of this patent

Programmable thermostatic control device

Life of this patent

Abstract

Claims8