Attributes (Heating Proportional Valve with 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

The following table describes the attributes used by the Heating Proportional Valve with Low Limit modules.

Table 1. Heating Proportional Valve with Low Limit Attributes

Name

Type 1

Description

Default Value

Compensator Htg Cmd

 

Controls the heating valve. The valve is commanded from 0% to 100%. This output incorporates the Lead Compensator.

0.0

Display Units: %

Failsoft Value

 

Defines the face and bypass damper position when the module is in the Failsoft state.

100.0%

Flush Position

 

Defines the proportional valve position when the module is in the Water Flush state.

100.0%

Heating Control Status

V

Current saturation status of the controller.

Set Name: Control Status

Heating Percent Cmd

V

Controls the heating valve. The valve is commanded from 0% to 100%.

Display Units: %

Heating Ramp Rate

 

Determines the time to remain in the Cold Start state (if applicable). During the cold start state, the preheat output is prevented from closing quickly to allow it to come into control without tripping the Low Limit on the unit.

20.0%

HTG-OUTSTATE, PH-OUTSTATE, or RH-OUTSTATE (State)

G, V

Current operational mode of the output controller.

Set Name: AHU Htg FBPD State

Limited Max Value

 

Defines the face and bypass damper position when the module is in the Limited Max mode.

100.0%

Low Limit Process Variable

 

Low limit temperature process variable. This input is usually the preheat or discharge air temperature.

7 °C, 45 °F

Low Limit Proportional Band

 

Contains the range across which the valve is proportionally modulated open as the Low Limit Process Variable drops below the Low Limit Setpoint plus the Low Limit Proportional Band. This input is used only in the Remain In Control mode.

5 °C, 9 °F

Low Limit Setpoint

 

Low limit temperature setpoint.

7 °C, 45 °F

Low OA Temperature Diff

 

Differential for the Low OA Temperature function. Once the valve has been opened in the Low OA Temperature mode, the OA Temperature must increase Low OA Temperature Diff more than the Low OA Temperature Setpoint before the valve can close.

0.5 °C, 1 °F

Low OA Temperature Position

 

Defines the proportional valve position or the face and bypass damper position when the module is in the Low OA Temperature state.

100.0%

Low OA Temperature Setpoint

 

Contains the setpoint for the Low OA Temperature function. When the OA Temperature is below this setpoint, the valve opens and the face and bypass damper is set to Low OA Temperature Position.

4 °C, 40 °F

Mode

 

Mode requested by State Selection.

Off

Set Name: AHU Htg Valve Out

OA Temperature

 

Outdoor air temperature.

4 °C, 40 °F

Output Overridden

 

Indicates when the actual output that is controlled by this output controller is overridden by a user.

False

Output Position

 

Provides the current Present Value of the output that this controller drives.

0%

PID Tuning Reset

 

Causes the PID objects to reset their tuning parameters to the default based on the appropriate Process ID.

Normal

Set Name: PID Tuning Reset

Process ID

 

Specifies the type of process that this output controller is controlling when the mode is T Control. The following lists the process variables and the correct setting for the Process ID.

Process Variable: Process ID
  • Discharge Air Temperature: DA-T
  • Preheat Air Temperature: DA-T
  • Return Air Temperature: ZN-T
  • Zone Air Temperature: ZN-T
  • Exhaust Air Temperature: ZN-T
  • Zone Air Temp Compensated: ZN-T LC

DA-T

Set Name: Process ID

Process Units

 

Specifies the units for the PID. For this particular module, °C and °F are the only two valid values.

°C, °F

Set Name: Unit

Process Variable

 

Control temperature. Either Zone temperature, discharge air temperature, return air temperature, or preheat temperature may be connected to this input.

13 °C, 55 °F

Pump OnOff

V

Controls the circulating pump.

Set Name: Off/On

Setpoint

 

Desired setpoint for the process variable to be controlled to when the mode is T Control.

13 °C, 55 °F

1 C - Configuration Mode Only, G - Default Element (Generated State, if applicable), SC - Simulation and Commissioning Modes Only, V - Calculated Value (Outputs)