Primary States (Fan RF or EF Vol Match for UL-864-UUKL) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 16.0

• Off: The fan is off when the module is in this mode of operation.

• Max: The return fan is commanded to its maximum speed. The Return Fan Percent Cmd output is set to 100%.

• Min: The analog fan output (Return Fan Percent Cmd) is zero, and the fan control output (Return Fan OnOff) is on when the module is in this mode of operation.

• Hold: Hold the outputs at their current position. If the Output Overridden is true, then the Output Position input is passed to the Cooling Percent Cmd. The module operates in this state when the output priorities are not 16.

• VOL Control: In this mode of operation, the return fan controls the return flow to maintain a differential flow (Volume Diff Setpoint) between the return and supply ducts. This operation is volume matching.

• Zero VOL Control: In this mode of operation, the return fan controls the return flow to maintain a differential flow (Volume Diff Setpoint) between the return and supply ducts.

• Emergency VOL Control: If the Supply Fan is On, the return fan controls the volume match differential. If the Supply Fan is Off, the module operates in the Emergency On state and the Emergency On Percent Cmd is issued to the Fan Percent Cmd output.

• Emergency Off: The fan is off and the priority is set to 1 or 2 depending on the FSCS status.

• Fan Track: The return fan is turned on and the Return Fan Percent Cmd is set to match the Supply Fan Percent Cmd.

The following table describes the State Output dependencies on Mode and Flow Reliability inputs.