Attributes (Dual Fan Lead-Lag) - 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 Dual Fan Lead-Lag modules.

Table 1. DUAL FAN Lead-Lag Attributes

Name

Type 1

Description

Default Value

Delay

 

This input defines the minimum time required for the lag fan to start or stop after the setpoint has been reached.

120

Display Units: seconds

Fan 1 Alarm

 

This Enum input shows the current alarm status for the first fan. The input may be either Normal when there is proof of airflow or Alarm when there is not.

Normal

Set Name: Normal/Alarm

Fan 2 Alarm

 

This Enum input shows the current alarm status for the second fan. The input may be either Normal when there is proof of airflow or Alarm when there is not.

Normal

Set Name: Normal/Alarm

Fan OnOff

G

This input is the fan command for the application. The activity uses this input to determine if a fan is needed to be commanded on or off.

Off

Set Name: Off/On

Fan Percent Cmd

 

This input defines the speed required for the fan or fans that are running.

0.0

Display Units: none

Lead Device Request

 

This input defines which fan is going to be the lead device.

Device 1

Set Name: AHU Two Device Sequencer

Stagedown Setpoint

 

This input defines the minimum percent command that is needed to transition from running two fans (Lead and Lag Devices) back to one fan (Lead Device).

28

Display Units: %

Stageup Setpoint

 

This input defines the maximum percent command that is needed to transition from running one fan (Lead Device) to two fans (Lead and Lag Devices).

90

Display Units: %

Fan 1 OnOff

 

This Enum output is the fan command for the first fan.

Off

Set Name: Off/On

Fan 2 OnOff

 

This Enum output is the fan command for the second fan.

Off

Set Name: Off/On

Fan 1 Output

 

This Float output is the fan speed command for the first fan.

0.0

Display Units: none

Fan 2 Output

 

This Float output is the fan speed command for the second fan.

0.0

Display Units: none

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