The following table describes the attributes used by the Dual Fan No Airflow Sequencing modules.
|
Name |
Type 1 |
Description |
Default Value |
|---|---|---|---|
|
Flow Status |
Indicates proof of airflow input for the first supply fan. This is an enumerated input with two possible values: NoFlow and Flow. |
Off Set Name: Off/On |
|
|
Command |
Indicates supply fan command for fan 1. The activity uses this input to determine if the fan was commanded on or off. |
Off Set Name: Off/On |
|
|
Flow Status2 |
Indicates proof of airflow input for the second supply fan. This is an enumerated input with two possible values: NoFlow and Flow. |
Off Set Name: Off/On |
|
|
Command 2 |
Indicates the supply fan command for fan 2. The activity uses this input to determine if the fan was commanded on or off. |
Off Set Name: Off/On |
|
|
Supply Flow |
Indicates the airflow measurement. This input may be used on a unit with electric heat to make sure the heating coils have enough airflow. |
200 l/s 424 cfm |
|
|
Min Air Flow Setpoint |
Defines the minimum amount of airflow required for operating the electric heat. |
200 l/s 424 cfm |
|
|
Electric Heat |
Indicates when electric heat is used. Units with electric may require low flow protection. |
False |
|
|
Restart Config |
This input is used to configure the sequencer for manual fault recovery. When set to true, a fault requires manual intervention for recovery. When set to false, the unit may self recover. To exit the manual reset mode, the operator must use the Hardware Restart or the Network Restart inputs to clear the fault. |
False |
|
|
Hardware Restart |
Provides a hardware binary input for fault recovery. |
Normal Set Name: Normal/Trigger |
|
|
Network Restart |
Provides a network input for fault recovery. |
Normal Set Name: Normal/Trigger |
|
|
Delay |
Defines the maximum time required for the fan to prove. If the fan is commanded on and does not prove within this time, the unit enters either the manual recovery fault state or the self recovery fault state. |
30 Seconds |
|
|
Flow Debounce |
Defines the amount of time the module ignores a temporary loss of airflow before it takes action. |
10 Seconds |
|
|
NOFLOW-STATE |
G |
Indicates current state of the activity. This output is connected to the state selection matrix. |
Normal Set Name: AHU Flow States |
|
Proof of Airflow |
Shows the current airflow status. This enumerated output may be either True, False, or Fault. True means one of the two fans was commanded on and airflow has been detected; False means the both fans were not commanded on; and Fault means the fans were commanded on, but airflow proof has not been detected for either fan. This output would be connected to the MSC primitive Proof of Airflow input for a staged device. |
True Set Name: False/True/Fault |
|
|
Status 1 |
Shows the current airflow status for the first fan. This Boolean output may be either True when there is proof of airflow or False when there is not. |
False |
|
|
Supply 2 |
Shows the current airflow status for the second fan. This Boolean output may be either True when there is proof of airflow or False when there is not. |
False |
|
|
Supply - OR |
Shows the current airflow status for both fans. This Boolean output may be either True when there is proof of airflow for either fan or False when there is not. This output would be connected to the Free Cooling Availability primitive Supply Fan Status input. |
False |
|
|
Alarm 1 |
Shows the current alarm status for the first fan. This Enum output may be either Normal when there is proof of airflow or Alarm when there is no proof. |
Normal Set Name: Normal/Alarm |
|
|
Alarm 2 |
Shows the current alarm status for the second fan. This Enum output may be either Normal when there is proof of airflow or Alarm when there is no proof. |
Normal Set Name: Normal/Alarm |