Method and apparatus for configuring and controlling a load

• US 5,161,387 A
• Filed: 04/26/1991
• Issued: 11/10/1992
• Est. Priority Date: 04/26/1991
• Status: Expired due to Term

• Current Assignee: Trane International Inc. (Trane Technologies plc)
• Original Assignee: American Standard Inc. (Trane Technologies plc)
• Inventors: Johnson, Tedd P., Metcalfe, Alan G., Foye, David M.
• Primary Examiner(s): Wayner, William E.
• Application Number:
  US07/691,940
• Time in Patent Office: 564 Days
• Field of Search: 236/94, 165/11.1, 431/13, 62/126, 361/166, 324/66
• US Class Current: 62/126
• CPC Class Codes: F24F 11/89 Arrangement or mounting of control or safety devices
• CPC Class Codes: G05D 23/1905 associated with tele control

Abstract

A method of determining and controlling a load by a controller. The method comprises the steps of transmitting a signal for a first predetermined time period on an electrical line having a load in parallel with a capacitor; monitoring the electrical line for electrical activity within a second predetermined time period following the first time period; and controlling the load in response to the presence or absence of the electrical activity.

Claims

1. A method of determining and controlling a load by a controller comprising the steps of:

transmitting a signal for a first predetermined time period on an electrical line having a load in parallel with a capacitor;

monitoring the electrical line for electrical activity within a second predetermined time period following the first time period; and

controlling the load in response to the presence or absence of the electrical activity.

2. The method of claim 1 including the further step of placing a jumper around the capacitor.

3. The method of claim 1 including the further step of removing a jumper from around the capacitor.

4. The method of claim 1 including the further step of setting the first and second time periods to be less than a response period of the load.

5. A method of configuring and controlling a load from a load controller comprising the steps of:

setting a tri-state output on an electrical line to a high state for a first predetermined time period;

setting the tri-state output on the electrical line to an input state for a second predetermined time period;

reading the electrical activity on the electrical line during the second predetermined time period; and

determining the existence of a load connected to the electrical line based on the presence or absence of electrical activity on the electrical line during the second predetermined time period.

6. The method of claim 5 including the further step of controlling the load if the load is determined to exist.

7. The method of claim 5 including the further step of setting the first and second predetermined time periods to be less than a response time of the load.

8. The method of claim 5 including a further step of placing a jumper around a capacitor.

9. The method of claim 5 including the further step of removing a jumper from around a capacitor.

10. A method of configuring the controller of an air conditioning system comprising the steps of:

setting a tri-state port to a high state for a first predetermined time period;

changing the tri-state port to an input state for a second predetermined time period;

receiving, for the second predetermined period of time, any signals present at the tri-state port; and

configuring the controller of the air conditioning system in accordance with the presence or absence of any signals received during the second predetermined time period.

11. The method of claim 10 including the further step of placing the tri-state port in a high or low state to control the activation or deactivation of a load.

12. The method of claim 10 including the further step of setting the first and second predetermined time periods to be less than a load response time period.

13. The method of claim 10 including the further step of placing a jumper around a capacitor.

14. The method of claim 13 wherein the jumper is a load to be controlled by the controller.

15. The method of claim 10 including the further step of removing a jumper from around a capacitor.

16. A system for controlling a load comprising:

a load;

a load controlling circuitry;

a tri-state port;

an electrical line operably connecting the load and the load controlling circuitry to the tri-state port;

a capacitor operably connected to the electrical line in parallel to the load controlling circuitry; and

means for negating the operation of the capacitor.

17. The system of claim 16 wherein the capacitor negating means includes a jumper bypassing the capacitor.

18. The system of claim 17 wherein the load is the jumper.

19. An air conditioning system comprising:

a compressor;

a condenser;

an expansion valve;

an evaporator;

conduit cyclically connecting the compressor, the condenser, the expansion valve and the evaporator in the listed order;

a plenum including the evaporator and a supply fan;

at least one condenser fan operably associated with the condenser; and

means for determining the existence of and controlling the operation of system loads;

wherein said determining and controlling means includes a jumper around a capacitor.

20. The system of claim 19 wherein said determining and controlling means includes means for sending a timing pulse of a first duration, and means for monitoring electrical activity for a time period of a second duration following said first time period, where the lengths of the first and second time periods is less than a load response time.

21. The system of claim 19 including a controller operatively associated with the determining and controlling means.

22. The system of claim 21 wherein the controller is operably connected to a system load by means of a tri-state port and an electrical line.

23. The system of claim 19 wherein the jumper comprises a system load.