Two mode thermostat with set-back temperature and humidity set-point feature

• US 8,863,536 B1
• Filed: 08/27/2010
• Issued: 10/21/2014
• Est. Priority Date: 04/30/2007
• Status: Active Grant

• Current Assignee: Copeland Comfort Control LP (Emerson Electric Company)
• Original Assignee: Emerson Electric Company
• Inventors: Perry, David L., Sartain, John M.
• Primary Examiner(s): Norman, Marc
• Assistant Examiner(s): Gonzalez, Paolo
• Application Number:
  US12/870,355
• Time in Patent Office: 1,516 Days
• Field of Search: 621/57, 621/763, 621/766, 621/78, 622/29, 622/31, 236/44.C, 236/DIG.9, 236/DIG.13, 165/237, 165/238, 165/239
• US Class Current: 62/176.6
• CPC Class Codes: F24F 11/30 for purposes related to the operation of the system, e.g. for safety or monitoring
• CPC Class Codes: F24F 11/65 for selecting an operating mode
• CPC Class Codes: F24F 2110/00 Control inputs relating to air properties
• CPC Class Codes: F24F 2110/10 Temperature
• CPC Class Codes: F24F 2110/20 Humidity
• CPC Class Codes: G05B 15/02 electric
• CPC Class Codes: G05D 22/02 characterised by the use of electric means
• CPC Class Codes: G05D 23/1902 characterised by the use of a variable reference value
• CPC Class Codes: G05D 27/02 characterised by the use of electric means

Abstract

Various thermostat embodiment are provided that includes at least a first sensor configured to communicate information indicative of the temperature within the space, and at least a second sensor configured to communicate information indicative of the humidity within the space. The thermostat further includes a controller in communication with the at least first and second sensors, for controlling the thermostat'"'"'s operation. The controller is configured to operate in a first mode in which the controller operates the air conditioner when the sensed temperature of the space is above a temperature set-point or when the sensed humidity level is above the humidity set-point. The controller is further configured to operate in a second mode in which the controller operates the air conditioner when the sensed temperature is below a set-back temperature set-point, or when the sensed humidity is above a set-back humidity set-point.

Claims

1. A controller-performed method for controlling operation of at least an air conditioner for conditioning a space, the method comprising:

based on a current time period, (a) an air conditioner controller using as a desired temperature set point one of a plurality of air conditioner user-inputted temperature set points separately received and stored by the controller and (b) the controller using as a desired humidity set point one of a plurality of air conditioner user-inputted humidity set points separately received and stored by the controller;

the controller receiving a temperature of the space sensed by a temperature sensor;

the controller receiving a humidity of the space sensed by a humidity sensor; and

based on the current time period, the controller responsively establishing an occupancy mode of operation or an unoccupied mode of operation of the air conditioner;

wherein in the unoccupied mode, when the sensed temperature is above the desired temperature set point, the controller ignores the sensed humidity and the desired humidity set point.

2. The method of claim 1, further comprising:

responsively establishing by the controller a mode of operation in which a compressor and a blower of the air conditioner operate at full capacity when the sensed humidity is below the desired humidity set point and the sensed temperature is above the desired temperature set point, or in which the compressor operates at less than full capacity and the blower operates at less than full capacity when the sensed humidity is above the desired humidity set point and the sensed temperature is below the desired temperature set point.

3. The method of claim 1, further comprising automatically setting a desired humidity set point of 100% such that the sensed humidity can never be above the desired humidity set point so as to trigger air conditioning operation during the unoccupied mode of operation.

4. The method of claim 1, wherein one of the plurality of air conditioner user-inputted humidity set points separately received and stored by the controller includes an occupancy mode humidity set point that is lower than the desired humidity set point used by the controller.