Electronic thermostat

• US 5,107,918 A
• Filed: 03/01/1991
• Issued: 04/28/1992
• Est. Priority Date: 03/01/1991
• Status: Expired due to Fees

• Current Assignee: Caradon Custom Controls Inc.
• Original Assignee: Lennox Industries Incorporated (Lennox International Incorporated)
• Inventors: Williams, Steven E., McFarlane, William, Beilfuss, Robert C.
• Primary Examiner(s): Wayner, William E.
• Application Number:
  US07/663,415
• Time in Patent Office: 424 Days
• Field of Search: 236/46 R, 236/47, 165/12, 364/557
• US Class Current: 165/238
• CPC Class Codes: G05D 23/1917 using digital means

Abstract

Apparatus and method useful in temperature control system for a predetermined area that employs a user friendly electronic thermostat that can be programmed intuitively and which is impossible to incorrectly program. Further, the electronic thermostat needs no periodic maintenance checks because it employs a super capacitor to supply electrical energy to memory if power is temporarily lost. A large display means is responsive to the operator'"'"'s programming as the programming is being performed, in addition to other times.

Claims

1. An electronic thermostat for controlling the temperature of a predetermined area comprising:

a first pair of slide means for controlling the temperature of the predetermined area during a first time interval;

a second pair of slide means for controlling the temperature of the predetermined area during a second time interval; and

a third pair of slide means for controlling a beginning time and an ending time of the second time interval whereby the first time interval and the second time interval consist essentially of a 24 hour period and the temperature of the predetermined area is determined by the position of the first pair of slide means during the first time interval and the temperature of the predetermined area is determined by the position of the second pair of slide means during the second time interval.

2. The apparatus of claim 1 wherein the electronic thermostat further comprises an override means for enabling the temperature of the predetermined area to be determined by the position of the first pair of slide means during the second time interval and for enabling the temperature of the predetermined area to be determined by the position of the second pair of slide means during the first time interval.

3. The apparatus of claim 1 wherein the electronic thermostat further comprises indicator means for specifying whether the temperature of the predetermined area is being controlled by the position of the first pair of slide means or the second pair of slide means.

4. The apparatus of claim 1 wherein the first pair of slide means is comprised of a cool slide and a heat slide, the cool slide and the heat slide being slidably attached to a first path having a first end and a second end, the cool slide being closer than the heat slide to the first end of the first path at all times.

5. The apparatus of claim 1 wherein the second pair of slide means is comprised of a cool slide and a heat slide, the cool slide and the heat slide being slidably attached to a second path having a first end and a second end, the cool slide being closer than the heat slide to the first end of the second path at all times.

6. The apparatus of claim 1 wherein the third pair of slide means is comprised of a begin slide and an end slide, the begin slide and the end slide being slidably attached to a third path having a first end and a second end, the begin slide being closer than the end slide to the first end of the third path at all times.

7. The apparatus of claim 1 further comprising a capacitor for supplying power to a memory portion of the electronic thermostat for a predetermined period of time in the event of a power failure.

8. The apparatus of claim 4 wherein the cool slide is electronically connected to a main thermostat board whereby the electronic thermostat will lower the temperature of the predetermined area when the current temperature is greater than the desired temperature as set by the cool slide and the time is within the first time interval.

9. The apparatus of claim 4 wherein the heat slide is electronically connected to a main thermostat board whereby the electronic thermostat will raise the temperature of the predetermined area when the current temperature is less than the desired temperature as set by the heat slide and the time is within the first time interval.

10. The apparatus of claim 5 wherein the cool slide is electronically connected to a main thermostat board whereby the electronic thermostat will lower the temperature of the predetermined area when the current temperature is greater than the desired temperature as set by the cool slide and the time is within the second time interval.

11. The apparatus of claim 5 wherein the heat slide is electronically connected to a main thermostat board whereby the electronic thermostat will raise the temperature of the predetermined area when the current temperature is less than the desired temperature as set by the heat slide and the time is within the second time interval.

12. The apparatus of claim 6 wherein the begin slide and the end slide are electronically connected to a main thermostat board whereby the electronic thermostat will adjust the temperature of the predetermined area according to the position of the second pair of slide means when the current time is later than the time set by the begin slide and prior to the time set by the end slide.

13. An electronic thermostat for controlling the temperature of a predetermined area comprising:

a housing means, the housing means comprises a thermostat and a subbase;

the subbase further comprises a subbase board, a first means for electrical communication, and a first means for mechanical coupling;

the thermostat further comprises a control panel, a main thermostat board, a thermostat cover, a second means for electrical communication, and a second means for mechanical coupling, the second means for electrical communication being electrically connected to the first means for electrical communication and the second means for mechanical coupling being connected to the first means for mechanical coupling;

the control panel further comprises a first pair of slide means arranged in an essentially linear manner, a second pair of slide means arranged in an essentially linear manner, and a third pair of slide means arranged in an essentially linear manner, the first pair of slide means further comprises a cool slide means and a heat slide means, both of which are electronically connected to the main thermostat board, the second pair of slide means further comprises a cool slide means and a heat slide means, both of which are electronically connected to the main thermostat board, and the third pair of slide means further comprises a begin slide and an end slide, both of which are electronically connected to the main thermostat board, whereby the third pair of slide means can be moved to set a second time interval in which the position of the second pair of slide means controls the temperature of the predetermined area, the third pair of slide means also essentially defining a first time interval as the time of day which is not occupied by the second time interval, in which the position of the first pair of slide means controls the temperature of the predetermined area.

14. The apparatus as claimed in claim 13 wherein the main thermostat board further comprises a display means which is responsive to the first pair of slide means, the second pair of slide means, and the third pair of slide means.

15. The apparatus as claimed in claim 13 wherein the main thermostat board further comprises a display means which is responsive to a fan running for a predetermined amount of time, both the display means and an accumulated fan running time being resettable via the control panel.

16. The apparatus as claimed in claim 13 wherein the display means is further comprised of an LCD.

17. The apparatus as claimed in claim 14 including a display button in circuit with the display means, the thermostat cover cooperating with the display button for selectively displaying the settings of the first pair of slide means, the second pair of slide means, the third pair of slide means, and the current temperature the electronic thermostat is trying to achieve for the predetermined area.

18. The apparatus as claimed in claim 17 including an ambient temperature sensor operatively connected to the display means, whereby actuation of the display button will also display the high and low ambient temperature of the day.

19. A method of controlling the temperature of a predetermined area via an electronic thermostat comprising the steps of:

sliding a first pair of slide means for controlling the temperature of the predetermined area during a first time interval;

sliding a second pair of slide means for controlling the temperature of the predetermined area during a second time interval; and

sliding a third pair of slide means for controlling a beginning time and an ending time of the second time interval.

20. The method of claim 19 further comprising the step of toggling an override means for enabling the temperature of the predetermined area to be determined by the position of the first pair of slide means during the second time interval and for enabling the temperature of the predetermined area to be determined by the position of the second pair of slide means during the first time interval.