The following table describes the attributes used by the Waterside Economizer Sequencer.
| Name | Description | Default Value |
|---|---|---|
|
CHWS Temperature |
This value is used with CW Temperature to calculate the lift and adjust the plant capacity if the lift sensitivity was defined for the chillers. |
44.0 |
|
CHWS Temperature Setpt |
Setpoint of the chilled water. |
44.0 |
|
CHWS-T Wait Time |
In the CHWS-T Timing state, this input is the time allowed for the CHWS-T to drop below the CHWS-Tsp. |
30 |
|
CHWS-Tsp Diff |
This input is the chilled water supply temperature setpoint differential. |
3.0 |
|
CW Temperature |
This value is the condenser water supply temperature. This value is used with CHWS Temperature to calculate the lift and adjust the plant capacity if the lift sensitivity was defined for the chillers. |
85.0 |
|
CW-T Chiller Start Setpt |
This value is the minimum condenser water supply temperature that allows safe startup of the chiller. |
60.0 |
|
CW-T Cooldown Time |
In the Start Hx state, this input is the time allowed for the CW-T to cool down to the economizer CW-Tsp before entering Hx Control. |
30 |
|
Chiller Count |
Indicates the number of chillers currently operating. |
0 |
|
Chiller Min On Time |
Minimum amount of time the chiller should be commanded on. In the Chiller Control state, this input is the time allowed for chillers to stay on and the system to stabilize before entering Stop Chillers. |
30 |
|
Econ Reset |
This input forces the FSM input Econ isValid to true, allowing the sequencer to transition from mechanical cooling to economizer cooling without being influenced by the amount of time Econ isAvail has been true. |
False |
|
Econ isAvail |
Enables or disables waterside economizer. |
False |
|
Hx Count |
Indicates the number of heat exchangers that are currently operating. |
0 |
|
Mech isAvail |
Indicates that the conditions allow mechanical (chiller) cooling. |
False |
|
System Enabled |
Enables or locks out the central plant system. |
False |
|
State |
Shows current state of output controller. |
Off
Set Name: Waterside Econ State |