Primary States (Zone Damper w Proportional Heating Valve) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 13.1

Controller Tool Help
Product
Controls > Control Tools > Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
13.1
Revision date
2019-12-04

The key states are described below. If the Heating Mode is Water Flush or Shutdown, the Heating Percent Cmd is set to the Flush Position or 0%, and the state is not allowed to enter Control Heating. Otherwise, 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 output input.

  • Shutdown: Sets the Damper Percent Cmd based on the Shutdown Option input. If the input PID Tuning Reset is Normal, the Reset Tuning input to the PID is set to true causing the PID to recalculate its tuning parameters.

Heating Mode

  • Control: Modulates the 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. If the input PID Tuning Reset is not Normal, the Reset Tuning input to the PID is set to true causing the PID to recalculate its tuning parameters.

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

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

Table 1. Zone Damper w Proportional 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 Heating

*

Hold

*

*

*

*

Reset 2nd PID

Control Cooling

*

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