The following table describes the attributes used by the Heating Sequenced Valves with Low Limit modules.
Name |
Type 1 |
Description |
Default Value |
---|---|---|---|
Failsoft Value |
Defines the face and bypass damper position when the module is in the Failsoft state. |
100.0% |
|
Heating Control Status |
V |
Contains the current saturation status of the controller. |
Set Name: Control Status |
Heating Ramp Rate |
Determines the time to remain in the Cold Start state (if applicable). During the cold start state, the preheat output is prevented from closing quickly to allow it to come into control without tripping the Low Limit on the unit. |
20.0% |
|
HTG-O (Percent Cmd) |
V |
Contains an analog percent output showing the total system output from 0% to 100%. |
Display Units: % |
HTG-OUTSTATE, PH-OUTSTATE, or RH-OUTSTATE (State) |
G, V |
Current operational mode of the output controller. |
Set Name: AHU Htg FBPD State |
Limited Max Value |
Defines the face and bypass damper position when the module is in the Limited Max mode. |
100.0% |
|
Low Limit Process Variable |
Low limit temperature process variable. This input usually is the preheat or discharge air temperature. |
7 °C, 45 °F |
|
Low Limit Proportional Band |
Contains the range across which the valve is proportionally modulated open as the Low Limit Process Variable drops below the Low Limit Setpoint plus the Low Limit Proportional Band. This input is used in the Remain In Control mode. |
5 °C, 9 °F |
|
Low Limit Setpoint |
Contains the low limit temperature setpoint. |
7 °C, 45 °F |
|
Low OA Temperature Diff |
Contains the differential for the Low OA Temperature function. Once the valve has been opened in the Low OA Temperature mode, the OA Temperature must increase Low OA Temperature Diff more than the Low OA Temperature Setpoint before the valve can close. |
0.5 °C, 1 °F |
|
Low OA Temperature Position |
Defines the proportional valve position or the face and bypass damper position when the module is in the Low OA Temperature state. |
100.0% |
|
Low OA Temperature Setpoint |
Setpoint for the Low OA Temperature function. When the OA Temperature is below this setpoint, the valve opens and the face and bypass damper is set to Low OA Temperature Position. |
4 °C, 40 °F |
|
Mode |
Mode requested by State Selection. |
Off Set Name: AHU 2 Sequenced Valves Out |
|
OA Temperature |
Outdoor air temperature. |
4 °C, 40 °F |
|
Output Overridden |
Indicates when the actual output controlled by this output is overridden by a user. |
False |
|
Output 1 Position |
Provides the current Present Value of the output 1 that this controller drives. |
0% |
|
Output 2 Position |
Provides the current Present Value of the output 2 that this controller drives. |
0% |
|
PID Tuning Reset |
Causes the PID objects to reset their tuning parameters to the default based on the appropriate Process ID. |
Normal Set Name: PID Tuning Reset |
|
Process ID |
This is the type of process that this output controller is controlling when the mode is T Control. The following lists the process variables and the correct setting for the Process ID. Process Variable: Process ID Discharge Air Temperature: DA-T Preheat Air Temperature: DA-T Return Air Temperature: ZN-T Zone Air Temperature: ZN-T Exhaust Air Temperature: ZN-T |
DA-T Set Name: Process ID |
|
Process Units |
Specifies the units for the PID. For this particular module, °C and °F are the only two valid values. |
°C, °F Set Name: Unit |
|
Process Variable |
Control temperature. Either Zone temperature, discharge air temperature, return air temperature, or preheat temperature may be connected to this input. |
13 °C, 55 °F |
|
Setpoint |
Desired setpoint for the process variable to be controlled to when the mode is T Control. |
13 °C, 55 °F |
|
Valve 1 Percent Capacity |
Indicates the percent of the total capacity provided by valve 1. In a 1/3 - 2/3 configuration, this input would be 33.3%. |
33.0% |
|
Valve 1 Percent Cmd |
V |
Controls the first (smaller) heating valve. The valve is commanded from 0% to 100%. |
Display Units: % |
Valve 2 Percent Cmd |
V |
Controls the second (larger) heating valve. The valve is commanded from 0% to 100%. |
Display Units: % |