-
Pressurize: This mode opens the OAD and closes the RAD and EAD.
-
Depressurize: This mode opens the EAD and closes the RAD and OAD.
-
Close: This mode opens the RAD and closes the EAD and OAD.
-
Purge: This mode opens the EAD and OAD and closes the RAD.
-
Min OA: This mode closes the EAD. The RAD and OAD are 100% open. This is done to prevent air from entering the building through the exhaust air damper.
-
Hold: This mode holds the dampers in their last position.
-
Ramp Min OA: This mode ramps the EAD closed and the OAD open at a controlled ramp rate. The RAD position is the complement of the EAD position.
-
Ramp Open: This mode ramps the EAD open at a controlled ramp rate. The RAD position is the complement of the EAD position, and the OAD is at a fixed 100% position.
-
T Control: This is the free cooling state. The EAD is modulated to allow outdoor air for cooling purposes. The OAD position is fixed at 100%, and the RAD position is the complement of the EAD position.
|
Mode |
FSCS OAD Cmd 1 |
FSCS EAD Cmd1 |
FSCS RAD Cmd1 |
PID Tuning Reset |
State |
|---|---|---|---|---|---|
|
* |
!Auto |
* |
* |
* |
FSCS Control |
|
* |
Auto |
!Auto |
* |
* |
FSCS Control |
|
* |
Auto |
Auto |
Auto |
* |
FSCS Control |
|
FSCS Control |
Auto |
Auto |
Auto |
* |
FSCS Control |
|
Pressurize |
Auto |
Auto |
Auto |
* |
Pressurize |
|
Depressurize |
Auto |
Auto |
Auto |
* |
Depressurize |
|
Close |
Auto |
Auto |
Auto |
* |
Close |
|
Purge |
Auto |
Auto |
Auto |
* |
Purge |
|
Min OA |
Auto |
Auto |
Auto |
* |
Min OA |
|
Hold |
Auto |
Auto |
Auto |
Reset 1st PID |
T Control |
|
Hold |
Auto |
Auto |
Auto |
* |
Hold |
|
Ramp Min OA |
Auto |
Auto |
Auto |
* |
Ramp Min OA |
|
Ramp Open |
Auto |
Auto |
Auto |
* |
Ramp Open |
|
T Control |
Auto |
Auto |
Auto |
* |
T Control |