Attributes (Heating Sequenced Valves with Low Limit) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 15.0

Controller Tool Help

Brand
Johnson Controls
Metasys
Product name
Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
15.0
Revision date
2022-11-18
Language
English

The following table describes the attributes used by the Heating Sequenced Valves with Low Limit modules.

Table 1. Heating Sequenced Valves with Low Limit Attributes

Name

Type 1

Description

Default Value

Failsoft Value

 

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

100.0%

Heating Control Status

V

Contains the current saturation status of the controller.

Set Name: Control Status

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-O (Percent Cmd)

V

Contains an analog percent output showing the total system output from 0% to 100%.

Display Units: %

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 usually is 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 in the Remain In Control mode.

5 °C, 9 °F

Low Limit Setpoint

 

Contains the low limit temperature setpoint.

7 °C, 45 °F

Low OA Temperature Diff

 

Contains the 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

 

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 2 Sequenced Valves Out

OA Temperature

 

Outdoor air temperature.

4 °C, 40 °F

Output Overridden

 

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

False

Output 1 Position

 

Provides the current Present Value of the output 1 that this controller drives.

0%

Output 2 Position

 

Provides the current Present Value of the output 2 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

 

This is 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

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

Setpoint

 

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

13 °C, 55 °F

Valve 1 Percent Capacity

 

Indicates the percent of the total capacity provided by valve 1. In a 1/3 - 2/3 configuration, this input would be 33.3%.

33.0%

Valve 1 Percent Cmd

V

Controls the first (smaller) heating valve. The valve is commanded from 0% to 100%.

Display Units: %

Valve 2 Percent Cmd

V

Controls the second (larger) heating valve. The valve is commanded from 0% to 100%.

Display Units: %

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