System for calibration of a compressor unit in a heating, ventilation, and air conditioning system

Patent metadata

Field	Value
Publication number	US-9417149-B2
Application number	US-201314064865-A
Country	US
Kind code	B2
Filing date	Oct 28, 2013
Priority date	Oct 28, 2013
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

The present invention provides for a system for calibrating operation of a compressor unit in a heating, ventilation, and air conditioning (HVAC) system. A measuring device measures an operating parameter of the HVAC system at a position where the measuring device is mounted on a refrigerant line of the HVAC system. The measuring device switches states when the value of the measured operating parameter reaches a switching value. A controller estimates a value of the first operating parameter at the position where the first measuring device is mounted on the refrigerant line, and the controller determines whether the estimated first operating parameter is within a threshold percentage of the switching value.

First claim

The invention claimed is:

1. A system for calibrating operation of a compressor unit in a heating, ventilation, and air conditioning (HVAC) system, the system comprising:
a control assembly configured to operationally connect to a compressor assembly of an HVAC system, wherein the compressor assembly comprises a first compressor unit, wherein the first compressor unit operates at an outside ambient temperature, and wherein the controller assembly comprises:
a first measuring device mounted on a first line of the compressor unit, the first measuring device configured to switch states from a first state to a second state, wherein the first line comprises a channel for the flow of refrigerant with the HVAC system, wherein the first measuring device measures at least a first operating parameter of the HVAC system at the position on the first line where the first measuring device is mounted, and wherein the first measuring device switches from the first state to the second state when the value of the measured first operating parameter reaches a first switching value; and
a controller configured to estimate a first estimated value of the first operating parameter at the position where there the first measuring device is mounted on the first line, and wherein the controller is configured to determine whether the first estimated value is within a first threshold percentage of the first switching value.

2. The system of claim 1 , wherein the controller is configured to generate a first communication based on the determination of whether the first estimated value is within the first threshold percentage of the first switching value.

3. The system of claim 2 , wherein the controller is configured to send the first communication by a wireless connection with an external device.

4. The system of claim 2 , wherein the controller is configured to determine whether the first measuring device has switched states from the first state to the second state.

5. The system of claim 4 , wherein the controller is configured to change demand on the compressor unit from a first load to a second load if the first measuring device has not switched states from the first state to the second state.

6. The system of claim 5 , wherein changing the demand on the compressor unit comprises changing a speed of the compressor unit.

7. The system of claim 5 , wherein the controller is configured to initiate a first mode of operation for calibrating operation of the compressor unit, wherein the initiation of the first mode of operation is based on the outside ambient temperature, and wherein the controller is configured to operate the compressor unit under the second load for a first time period to change the measured first operating parameter of the HVAC system to cause the first measuring device to switch states.

8. The system of claim 7 , wherein the controller is configured to determine whether the outside ambient temperature is within a first calibration range, and wherein the measuring device is configured to change states when the compressor unit is operated within the first calibration range.

9. The system of claim 8 , wherein the first measuring device comprises a pressure switch and the first operating parameter comprises the pressure of the refrigerant in the first line at the position where the first measuring device is mounted, and wherein the pressure switch is configured to measure the pressure of the refrigerant at the position where the pressure switch is mounted on the first line.

10. The system of claim 8 , wherein the first measuring device comprises a temperature switch and the first operating parameter comprises the temperature of the refrigerant in the first line at the position where the first measuring device is mounted, and wherein the temperature switch is configured to measure the temperature of the refrigerant at the position where the temperature switch is mounted on the first line.

11. A method for calibrating operation of a compressor unit in a heating, ventilation, and air conditioning (HVAC) system:
providing a control assembly configured to operationally connect to a compressor assembly of an HVAC system, wherein the compressor assembly comprises a first compressor unit configured to operate at an outside ambient temperature;
wherein the control assembly comprises a first measuring device mounted to a first line of the compressor unit, and wherein the first measuring device is configured to switch states from a first state to a second state at a first switching value, wherein the first line comprises a channel for the flow of refrigerant with the HVAC system, wherein the first measuring device measures at least a first operating parameter at the position on the first line where the first measuring device is mounted;
switching, by the first measuring device, to the second state when the value of the measured first operating parameter reaches the first switching value;
estimating, by the controller, a first estimated value of the first operating parameter at the position where there the first measuring device is mounted on the first line; and
determining, by the controller, whether the first estimated value is within a first threshold percentage of the first switching value.

12. The method of claim 11 , further comprising:
generating, by the controller, a first communication based on the determination of whether the first estimated value is within the first threshold percentage of the first switching value.

13. The method of claim 12 , further comprising sending, by the controller, the first communication by a wireless connection with an external device.

14. The method of claim 12 , further comprising determining whether the first measuring device has switched states from the first state to the second state.

15. The method of claim 14 , further comprising changing demand on the compressor unit from a first load to a second load if the first measuring device has not switched states from the first state to the second state.

16. The method of claim 15 , wherein changing the demand on the compressor unit comprises changing a speed of the compressor unit.

17. The method of claim 15 , further comprising:
initiating, by the controller, a first mode of operation for calibrating operation of the compressor unit, wherein the initiation of the first mode of operation is based on the outside ambient temperature; and
operating, by the controller, the compressor unit under the second load for a first time period to change the measured first operating parameter at the first line from a first measured value to a second measured value, wherein the change in the first operating parameter at the first line from the first measured value to the second measured value of the first operating parameter causes the first measuring device to switch states.

18. The method of claim 17 , further comprising:
measuring, by the controller, the outdoor temperature; and
changing, by the first measuring device, states when the compressor unit is operated at the outside ambient temperature within a first calibration range.

19. The method of claim 17 , wherein the first measuring device comprises a pressure switch, and the first operating parameter comprises the pressure of the refrigerant in the first line at the position where the first measuring device is mounted, and wherein the pressure switch is configured to measure the pressure of the refrigerant at the position where the pressure switch is mounted on the first line.

20. The method of claim 17 , where

Assignees

• Lennox Ind Inc

Inventors

• Berg Eric
• Goel Rakesh

Classifications

• Y02B30/70

  Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating · CPC title

• G01L27/002 Primary

  Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination · CPC title

• G01L27/005 Primary

  Apparatus for calibrating pressure sensors · CPC title

• F25B2600/0253

  with variable speed · CPC title

• F25B2700/1931

  Discharge pressures · CPC title