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

Controller Tool Help

Brand
Johnson Controls
Metasys
Product name
Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
16.0
Revision date
2023-10-02
Language
English

Cooling Mode

The following cooling modes are only active when the SummerWinter input is set to Summer.

  • Off: Sets the Cooling Percent Cmd and Percent Cmd to 0%.

  • Max: Sets the output for maximum cooling. The Cooling Percent Cmd is set to 100%.

  • Limited Max: Sets the Heating Percent Cmd to the Limited Max Value input percentage.

  • Hold: Holds the Cooling Percent Cmd output at its current value. If the Output Overridden input is true, the Output Position input is passed to the Heating/Cooling Percent Cmd.

  • Water Flush: Sets the Cooling Percent Cmd output to 100%.

  • Control: Adjusts the output to control the Process Variable (cooling only). As this Cooling Percent Cmd varies, it causes changes to the valve output. If the Process Variable is reliable, the module controls the output in order to maintain the process variable at the Cooling Setpoint. Otherwise, the Cooling Percent Cmd output is set to 0%. If the PID Tuning Reset is true, the Reset Tuning input to the PID is set true causing the PID to recalculate its tuning parameters. While that occurs, the Heating/Cooling Percent Cmd is held at its last value.

  • Failsoft: Sets the Cooling Percent Cmd and Percent Cmd outputs to the Failsoft Clg Value.

Heating Mode

The following heating modes are only active when the SummerWinter input is set to Winter.

  • Off: Sets the Htg Percent Cmd and Percent Cmd to 0%.

  • Max: Sets the output for maximum heating. The Heating Percent Cmd is set to 100%.

  • Limited Max: Sets the Heating Percent Cmd to the Limit Max Value input percentage.

  • Hold: Holds the Heating Percent Cmd output at its current value. If the Output Overridden input is true, the Output Position input is passed to the Heating/Cooling Percent Cmd.

  • Water Flush: Sets the Heating Percent Cmd output to 100%.

  • Control: Adjusts the output to control the Process Variable (heating only). As the Heating Percent Cmd varies, it causes changes to the valve output. If the Process Variable is reliable, the module controls the output to maintain the process variable at the Heating Setpoint. Otherwise the Heating Percent Cmd output is set to 0%. If the PID Tuning Reset is true, the Reset Tuning input to the PID is set true causing the PID to recalculate its tuning parameters. While that occurs, the Heating/Cooling Percent Cmd is held at its last value.

  • Control Limit: Adjusts the output to control the Low Limit Process Variable (heating only). As the Heating Percent Cmd varies, it causes changes to the valve output. The process variable (zone temperature) is also controlled in this mode. The maximum of the Control Limit and Control Heating output is sent as the Heating Percent Cmd.

  • Failsoft: Sets the Heating Percent Cmd and Percent Cmd outputs to the Failsoft Htg Value.

Table 1. 2 Pipe Proportional Valve with DA-T Low Limit Command Hierarchy

SummerWinter

Heating Mode

Cooling Mode

PID Tuning Reset

State

*

Hold

*

Reset 1st PID

Control Limit

*

Hold

*

Reset 2nd PID

Control Cooling

*

*

Hold

Reset 1st PID

Control Cooling

*

*

Hold

Reset 2nd

Control Limit

Winter

Off

*

 

Off

Max

*

 

Max Heating

Limited Max

*

 

Limited Max Heating

Water Flush

*

 

Water Flush Heating

Hold

*

 

Hold

Control Limit

*

 

Control Limit

Control

*

 

Control Heating

Failsoft

*

 

Failsoft Heating

Summer

*

Off

 

Off

Max

 

Max Cooling

Limited Max

 

Limited Max Cooling

Water Flush

 

Water Flush Cooling

Hold

 

Hold

Control

 

Control Cooling

Failsoft

 

Failsoft Cooling