Mechanical System Troubleshooting - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 15.0

Controller Tool Help

Johnson Controls
Product name
Controller Configuration Tool
Document type
User Guide
Document number
Revision date
Check that the mechanical system is available, operational, and of the required capacity. Some situations that contribute to PRAC+ tuning problems during construction and system startup include the following:
  • The cooling output was controlled when chilled water was not available.
  • The heating output was controlled when hot water was not available.
  • The VAV boxes or static pressure output was allowed to control when the air system was not running.
  • The system does not have the capacity to meet the load.
  • Valve installation is incorrect. Valves must be installed in the correct direction, free of debris, powered, calibrated and wired correctly so they can fully open and fully close.
  • Damper installation is incorrect. Dampers must be able to open and close, with actuators mounted, wired correctly, and calibrated.
  • VFD and PID low limit are set incorrectly. The VFD must be calibrated and in auto. The PID low limit should be set to the minimum output of the drive.
  • Sensor installation is incorrect. The sensors must be wired and located properly.