Chapter 2 Crossword

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Across
  1. 6. The difference between the value of a control point and its corresponding setpoint.
  2. 8. A building automation device that monitors or changes system variables, makes control decisions, or interfaces with other types of systems.
  3. 9. The range between two setpoints in which no control action takes place.
  4. 11. A signal that has a continuous range of possible values between two points.
  5. 14. A device that accepts a control signal and causes a mechanical motion.
  6. 18. A control algorithm in which the output is determined by the sum of the offset over time.
  7. 19. A control strategy that makes system adjustments necessary to maintain a control point above a certain value.
  8. 20. A supervisory control strategy in which the date and time are used to determine the desired operation of a load or system.
  9. 22. An electrical switch that is actuated by a separate electrical circuit.
  10. 27. A control function in which occupants temporarily change a zone from an UNOCCUPIED to OCCUPIED state.
  11. 28. An oscillation of output resulting from feedback that changes from positive to negative.
  12. 30. Some changing characteristic in a system.
  13. 32. A supervisory control strategy in which the HVAC load is turned on as late as possible to achieve the indoor environment setpoints by the beginning of building occupancy.
  14. 36. A control algorithm in which the output is in direct response to the amount of offset in the system.
  15. 37. A changing characteristic used to communicate building automation information between control devices.
Down
  1. 1. The desired value to be maintained by a system.
  2. 2. A control system in which the result of an output is fed back into a controller as an input.
  3. 3. A device that makes decisions to change some aspect of a system based on sensor information and internal programming.
  4. 4. The actual value that a control system experiences at any given time.
  5. 5. A signal that has only two possible states.
  6. 7. The measurement of the results of a control action by a sensor.
  7. 9. A control algorithm in which the output is determined by the instantaneous rate of change of a variable.
  8. 10. A set of rules and procedures for the exchange of information between two connected devices.
  9. 12. A sequence of instructions for producing the optimal result to a problem.
  10. 13. A control strategy that makes system adjustments necessary to maintain a control point below a certain value.
  11. 15. The portion of controller software that produces the calculated outputs based on the inputs.
  12. 16. The recording of past building equipment operating information.
  13. 17. The combination of proportional, integral, and derivative algorithms.
  14. 21. A control system in which decisions are made based only on the current state of the system and a model of how it should work.
  15. 23. A control strategy that calculates an average value from multiple inputs, which is then used in control decisions.
  16. 24. A device that measures the value of a controlled variable, such as temperature, pressure, or humidity, and transmits a signal that conveys this information to a controller.
  17. 25. The detection and notification of abnormal building conditions.
  18. 26. A control strategy in which a primary setpoint is adjusted automatically as another value (the reset variable) changes.
  19. 29. A control point that exists only in software.
  20. 31. A control strategy that alternates the operation of two or more similar pieces of equipment in the same system.
  21. 33. The adjustment of control parameters to the optimal values for the desired control response.
  22. 34. The adjustment of control parameters to the optimal values for the desired control response.
  23. 35. The continuous repetition of control logic decisions.
  24. 38. The unoccupied heating or cooling setpoint.