Attributes (Fan RF or EF Vol Match for UL-864-UUKL) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 13.1

Controller Tool Help

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Controller Configuration Tool
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User Guide
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The following table describes the attributes used by the Fan RF or EF Vol Match for UL-864-UUKL modules.

Table 1. Fan RF or EF Vol Match for UL-864-UUKL Attributes


Type 1


Default Value


V, G

Indicates the current operational mode of the output controller. This output is the current state of the activity.


Set Name: AHU RF VOL State UL

Emergency On Percent Cmd


Indicates the Percent Cmd issued to the fan if an emergency calls for the Return Fan to run and the Supply Fan is Off.




Accepts a command from the FSCS, and allows emergency personnel to control the return fan.


Set Name: Auto/Off/On

Low Limit Process Variable


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

7 °C, 45 °F

Low Limit Proportional Band


Defines the temperature range where the flow differential setpoint is reset to control the low limit process variable to the low limit temperature setpoint.

5 °C, 9 °F

Low Limit Setpoint


Contains the upper threshold for the low limit process function. When the low limit process variable is above this temperature, the return fan may be modulated to maintain the desired flow differential between the supply duct and the return duct. Below this setpoint, outdoor air levels may be limited by resetting the differential flow setpoint.

7 °C, 45 °F



Contains the desired mode of operation.


Set Name: AHU RF VOL Mode UL

Output Overridden


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


Output Position


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


PID Tuning Reset


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


Set Name: PID Tuning Reset



Specifies the BACnet priority for the output points. For normal control, this value is set to 16 (Default). This value is set to 1 when the FSCS input is not Auto and set to 2 (Automatic Fire/Life Safety Control) when the Mode indicates an emergency is not Normal.


Process Units


Allows the user to define the units for the process.

l/s, cfm

Set Name: Unit

Return Fan Control Status


PID Status. The possible values are normal, overridden, disabled, low, timing low, high, and timing high.


Set Name: Control Status

Return Fan OnOff


On/off signal for the return fan.


Set Name: Off/On

Return Fan Percent Cmd


Contains the analog signal for the return fan used to command fan speed. This output can range from 0% to 100%.


Return Flow


Return airflow.

10000 l/s, 22000 cfm

Supply Fan Percent Cmd


Contains the analog signal from the supply fan used in the Failsoft mode.


Supply Fan State


Indicates the current state of operation for the supply fan. During an emergency mode, this value determines whether the fan is running.


Supply Flow


Discharge airflow.

10000 l/s, 22000 cfm

Vol Process Range


Specifies the magnitude of the range that the PID Process Variable traverses as the PID Present Value varies between its minimum and maximum values. For example, the process range should be configured to be the design flow of the return fan.

10000 l/s, 22000 cfm

Volume Diff Setpoint


Contains the volume differential (Supply Flow - Return Flow or Supply Flow - Exhaust Flow) setpoint.

0 l/s, 0 cfm

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