Primary States (2 Pipe FBPD 2 Position Valve with Low Limit) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 16.0

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

  • Off: Turn everything off. The Percent Cmd, and Damper Percent Cmd is set to 0%.

  • Max: Open the valve and the damper. The Percent Cmd and Damper Percent Cmd is set to 100%.

  • Limited Max Heating: The valve is opened and the damper is opened to the Limited Max Heating Value. This state may be used for unoccupied heating. Percent Cmd is set equal to Limited Max Heating Value; therefore, this mode would be able to start the AHU.

  • Limited Max Cooling: The valve is opened and the damper is opened to the Limited Max Cooling Value. This state may be used for unoccupied cooling. Percent Cmd is set equal to Limited Max Cooling Value; therefore, this mode would be able to start the AHU.

  • Hold: Hold the outputs at their current position. If the Output Overridden is true, then the OUtput Position input is passed to the Heating Percent Cmd.

  • Water Flush: The valve is opened and the damper is closed. The Percent Cmd is set to 0%, therefore this mode does not trigger the AHU to start.

  • Heating T Control: If the Process Variable is reliable, open the valve and adjust the damper output to control the Process Variable at the Heating Setpoint. The Percent Cmd and Damper Percent Cmd are adjusted between 0% and 100%.

  • Cooling T Control: If the Process Variable is reliable, open the valve and adjust the damper output to control the Process Variable at the Cooling Setpoint. The Percent Cmd and Damper Percent Cmd are adjusted between 0% and 100%.

  • Failsoft Heating: The valve is opened and the damper is opened to the Failsoft Heating Value. This state is used when the control temperature is unreliable. Percent Cmd remains unchanged so this mode does not trigger the AHU to either start or stop.

  • Failsoft Cooling: The valve is opened and the damper is opened to the Failsoft Cooling Value. This state is used when the control temperature is unreliable. Percent Cmd remains unchanged so this mode does not trigger the AHU to either start or stop.

  • Low OA Temperature: When the OA Temperature is reliable and less than the Low OA Temperature Setpoint the valve is open. Damper Percent Cmd is set to the Low OA Temperature Position. The Percent Cmd is set to 0%, therefore this mode does not trigger the AHU to start.

Table 1. 2 Pipe FBPD 2 Position Valve with Low Limit Command Hierarchy

SummerWinter

Cooling Mode

Heating Mode

OA Temperature is Reliable

PID Tuning Reset

State

*

Hold

*

*

Reset 1st PID

Cooling T Control

*

Hold

*

*

Reset 2nd PID

Heating T Control

*

*

Hold

*

Reset 1st PID

Cooling T Control

*

*

Hold

*

Reset 2nd PID

Heating T Control

Winter

*

Off

*

*

Off

Hold

*

*

Hold

Water Flush

*

*

Water Flush

Max

*

*

Max

Limited Max

*

*

Limited Max Heating

T Control

*

*

Heating T Control

Failsoft

*

*

Failsoft Heating

Low OA Temperature

TRUE

*

Low OA Temperature

FALSE

*

Limited Max Heating

Summer

Off

*

*

*

Off

Hold

*

*

*

Hold

Water Flush

*

*

*

Water Flush

Max

*

*

*

Max

Limited Max

*

*

*

Limited Max Cooling

T Control

*

*

*

Cooling T Control

Failsoft

*

*

*

Failsoft Cooling

Low OA Temperature

*

TRUE

*

Low OA Temperature

FALSE

*

Limited Max Cooling