Loss of Airflow Strategy (Preheat Coil) (MASD) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 13.1

Controller Tool Help

Product name
Controller Configuration Tool
Document type
User Guide
Document number
Revision date
Loss of Airflow Strategy describes how you want the coil to behave when the unit status changes to false while commanded on.
  • Off sends a 0% command to the coil and stops a coil pump (if you have one).

  • Remain in Control has the same control loop that controls the coil while the unit is operating during loss of airflow.

  • Protect Coil Based on Outdoor Air Temperature opens the valve, as needed, when the outdoor air falls below the low limit setpoint. This strategy can protect the air handler coils during extreme temperatures.

  • Low OA Temperature - Leaving Water Control modulates the valve during times of low OA temperature to maintain a leaving water temperature of 45 °F.

  • User Defined Position commands the valve to a pre-defined position while the unit is in shutdown mode.

Note: The Loss of Airflow Strategy options are available only when you select the Automatic Restart option for the Supply Fan Status Loss of Airflow Strategy.