The following table describes the attributes used by the Dual Fan Lead-Lag modules.
|
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 |