Primary States (Zone Damper w 2 Position Heating Valve) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 16.0

Controller Tool Help
Product name
Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
16.0
Revision date
2023-10-02

The key states are described below. If the Heating Mode is Water Flush or Shutdown, the Heating Percent Cmd is set to 100% or 0%, respectively, and the state is not allowed to enter Control Heating. Otherwise, when the Cooling Mode is Control and the Zone Temperature is reliable, a two-state FSM determines whether heating or cooling should be active.

Cooling Mode

  • Control: Modulates the zone damper to control the Process Variable at the Effective Setpoint. If the Process Variable is unreliable, the Damper Percent Cmd is set is based on the Unreliable Option input.

  • Shutdown: Sets the Damper Percent Cmd based on the Shutdown Option input.

Heating Mode

  • Control: Cycles the two position heating valve to control the Process Variable at the Effective Setpoint. If the Process Variable is unreliable, the Heating Percent Cmd is set to true based on the Unreliable Option input.

  • Shutdown: Sets the Heating Percent Cmd based on the Shutdown Option input.

  • Water Flush: Sets Heating Percent Cmd to 100%. The zone damper continues to respond appropriately for heating or cooling.

Table 1. Zone Damper w 2 Position Heating Valve Command Hierarchy

Cooling Mode

Heating Mode

Shutdown Option

Unreliable Option

ZN-T Reliable

FSM State

PID Tuning Reset

State

Hold

*

*

*

*

*

Reset 1st PID

Control Cooling

Hold

*

*

*

*

*

Reset 2nd PID

Control Heating

Hold

*

*

*

*

*

*

Hold

*

Hold

*

*

*

*

Reset 1st PID

Control Cooling

*

Hold

*

*

*

*

Reset 2nd PID

Control Heating

*

Hold

*

*

*

*

*

Hold

Shutdown

Not (Control)

Open (Cooling)

*

*

*

*

Open (Cooling)

Close (Heating)

*

*

*

*

Close (Heating)

Hold Damper

*

*

*

*

Hold Damper

Control

*

*

TRUE

*

*

Control Heating

Open (Cooling)

FALSE

*

*

Open (Cooling)

Close (Heating)

*

*

Close (Heating)

Hold Damper

*

*

Hold Damper

Not (Shutdown)

*

*

*

TRUE

Cooling

*

Control Cooling

Heating

*

Control Heating

Open (Cooling)

FALSE

*

*

Open (Cooling)

Close (Heating)

*

*

Close (Heating)

Hold Damper

*

*

Hold Damper