System and method of determining proper operation of an HVAC system

• US 10,234,156 B2
• Filed: 08/12/2016
• Issued: 03/19/2019
• Est. Priority Date: 08/12/2015
• Status: Active Grant

• Current Assignee: Carrier Corporation (Carrier Global Corporation)
• Original Assignee: Carrier Corporation (Carrier Global Corporation)
• Inventors: Dempsey, Daniel J., Lee, Jun Pyo
• Primary Examiner(s): Furdge, Larry
• Application Number:
  US15/236,164
• Publication Number:
  US 20170045253A1
• Time in Patent Office: 949 Days
• 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 11/49 ensuring correct operation, e.g. by trial operation or configuration checks
• CPC Class Codes: F24F 11/52 Indication arrangements, e.g. displays
• CPC Class Codes: F24F 11/526 giving audible indications
• CPC Class Codes: F24F 11/67 Switching between heating and cooling modes
• CPC Class Codes: F24F 2110/10 Temperature
• CPC Class Codes: F24F 2130/00 Control inputs relating to environmental factors not covered by group F24F2110/00
• CPC Class Codes: F24F 2130/10 Weather information or forecasts
• CPC Class Codes: G05D 23/19 characterised by the use of electric means G05D23/1393 takes precedence

Abstract

A system and method for determining proper operation of an HVAC system by generating a test condition, operating the HVAC system in a heating or cooling mode for either an operational duration of time or until a first indoor air temperature change limit is achieved, if the test condition is satisfied, determining whether the HVAC system is performing at an operational tolerance level, and generating an alert signal if the HVAC system is not performing at the operational tolerance level.

Claims

1. A method of determining proper operation of an HVAC system including a controller in communication with an HVAC unit, the method comprising:

(a) operating the controller to generate a test condition;

(b) operating the HVAC unit in a heating or cooling mode;

if the test condition is satisfied;

(c) operating the controller to determine whether the HVAC unit is performing at an operational tolerance level;

(d) operating the controller to generate an alert signal if the HVAC unit is not performing at the operational tolerance level.

2. The method of claim 1, wherein step (a) further comprises:

operating the controller to determine whether the HVAC unit has been inoperative in a heating or cooling mode in excess of an idle duration of time; and

(ii) operating the controller to acquire weather information from an external source, wherein the weather information is based at least upon a geographical location of the at least one HVAC unit.

3. The method of claim 2, wherein the external source is configured to supply up to date, but not necessarily instantaneous, weather information.

4. The method of claim 2, wherein the idle duration of time is greater than or equal to approximately 14 days.

5. The method of claim 3, wherein the weather information comprises a plurality forecasted air temperature values within a forecasted period of time.

6. The method of claim 5, wherein the test condition comprises at least one of:

(i)determining whether one of the plurality of forecasted air temperature values is greater than or equal to a cooling limit temperature value or whether one of the plurality of forecasted air temperature values is less than or equal to a heating limit temperature value; and

(ii) determining whether one of the plurality of forecasted air temperature values is greater than or equal to a minimum outdoor air temperature value of the last operation of the HVAC unit in a cooling mode or less than or equal to a maximum outdoor air temperature value of the last operation of the HVAC unit in a heating mode.

7. The method of claim 6, wherein the cooling limit temperature value is approximately 75 degrees Fahrenheit.

8. The method of claim 6, wherein the heating limit temperature value is approximately 50 degrees Fahrenheit.

9. The method of claim 5, wherein the forecasted period of time is less than or equal to 5 days.

10. The method of claim 1, wherein the operational duration of time is less than or equal to approximately 30 minutes.

11. The method of claim 1, wherein in step (b) the HVAC unit operates for an operational duration of time or until a first indoor air temperature change limit has been achieved.

12. The method of claim 11, wherein the first indoor air temperature change limit is approximately 2 degrees Fahrenheit.

13. The method of claim 1, wherein step (c) comprises:

(i) operating the controller to record a first indoor air temperature value at a first interval and a second indoor air temperature at a second interval; and

(ii) determining whether the difference between the first indoor temperature air value and the second indoor air temperature value is less than or equal to a second indoor air temperature change limit.

14. The method of claim 13, wherein the first indoor air temperature value comprises a highest indoor air temperature value at the first interval in a cooling mode or a lowest indoor air temperature value at the first interval in a heating mode.

15. The method of claim 13, wherein the first interval comprises an interval greater than or equal to approximately 5 minutes, and the second interval comprises an interval equal to approximately 10 minutes from the determination of either the highest indoor air temperature value at the first interval or the lowest indoor air temperature value at the first interval.

16. The method of claim 13, wherein the second indoor air temperature change limit is less than or equal to approximately 0.5 degrees Fahrenheit.

17. The method of claim 1, wherein the alert signal comprises at least one of a visual signal, an audio signal, and an electronic signal.

18. An HVAC system comprising:

a system controller including a processor, a memory, and a communication module; and

an HVAC unit in communication with the system controller;

wherein the processor is configured to operate a program stored in memory, the program configured to;

(a) generate a test condition;

(b) operate the HVAC unit in a heating or cooling mode if the test condition is satisfied;

(c) determine whether the HVAC unit is performing at an operational tolerance level; and

(d) generate an alert signal if the HVAC unit is not performing at the operational tolerance level.

19. The HVAC system of claim 18, wherein to generate a test condition, the processor is further configured to determine whether the HVAC unit has been inoperative in excess an idle duration of time, and command the communication module to acquire weather information.

20. The HVAC system of claim 19, wherein the communication module is configured to acquire weather information from an external source based at least upon a geographical location of the HVAC unit, wherein the weather information comprises a plurality forecasted air temperature values within a forecasted period of time.

21. The HVAC system of claim 20, wherein the external source is configured to supply up to date, but not necessarily instantaneous, weather information.

22. The HVAC system of claim 19, wherein the idle duration of time is greater than or equal to approximately 14 days.

23. The HVAC system of claim 19, wherein the processor is further configured to:

(i)determine whether one of the plurality of forecasted air temperature values is greater than or equal to a cooling limit temperature value or whether one of the plurality of forecasted air temperature values is less than or equal to a heating limit temperature value; and

(ii) determine whether one of the plurality of forecasted air temperature values is equal to a minimum outdoor air temperature value of the last operation of the HVAC unit in a cooling mode or a maximum outdoor temperature value of the last operation of the HVAC unit in a heating mode.

24. The HVAC system of claim 23, wherein the cooling limit temperature value is approximately 75 degrees Fahrenheit.

25. The HVAC system of claim 23, wherein the heating limit temperature value is approximately 50 degrees Fahrenheit.

26. The HVAC system of claim 20, wherein the forecasted period of time is less than or equal to 5 days.

27. The HVAC system of claim 18, wherein in the processor operates the HVAC unit for an operational duration of time or until a first indoor air temperature change limit has been achieved.

28. The HVAC system of claim 27, wherein the operational duration of time is less than or equal to approximately 30 minutes.

29. The HVAC system of claim 27, wherein the first indoor air temperature change limit is approximately 2 degrees Fahrenheit.

30. The HVAC system of claim 18, wherein to determine whether the HVAC unit is performing at the operational tolerance level, the processor is further configured to:

(i)record a first indoor air temperature value at a first interval and a second indoor air temperature at a second interval; and

(ii) determine whether the difference between the first indoor air temperature value and the second indoor air temperature value is less than or equal to a second indoor air temperature change limit.

31. The HVAC system of claim 30, wherein the first indoor air temperature value comprises a highest indoor air temperature value at the first interval in a cooling mode or a lowest indoor air temperature value at the first interval in a heating mode.

32. The HVAC system of claim 30, wherein the first interval comprises an interval greater than or equal to approximately 5 minutes, and the second interval comprises an interval equal to approximately 10 minutes from the determination of either the highest indoor temperature value at the first interval or the lowest indoor temperature value at the first interval.

33. The HVAC system of claim 30, wherein the second indoor air temperature change limit is less than or equal to approximately 0.5 degrees Fahrenheit.

34. The HVAC system of claim 18, wherein the alert signal comprises at least one of a visual signal, an audio signal, and an electronic signal.