This module controls heat pump compressors and reversing valves that are dynamically switched from a heating to a cooling mode. This module is designed to provide this control within a zone control application.
The module accepts as inputs a cooling mode and a heating mode, process variable, two setpoints, and configuration information. Based upon the input modes and Proof of Airflow input, the module outputs a percent command along with the calculated cooling and heating percentages for feedback purposes. Prior to commanding, the compressor on the module commands the reversing value to the proper position. The heating and cooling control status are also output. This module also incorporates tracking the overridden value of the actual output object (AO, PAO). The module resets the PIDs to default tuning parameters if the Reset PID Tuning input is not Normal.
This module provides EWMA diagnostic values calculated by the PID. Controllers have the ability to collect data about their inputs, outputs, and internally calculated variables. Inside the controller, the EWMA minimizes memory requirements, reduces communication traffic, and provides an easy way to analyze collected data. See EWMA Diagnostics in the Commissioning a System section for more information.
You can view and modify the modules in this group’s logic. The Finite State Machine cannot be modified.