The following table describes the attributes used by the Heat Recovery Wheel modules.
|
Name |
Type 1 |
Description |
Default Value |
|---|---|---|---|
|
Cooling Control Status |
V |
PID Status. The possible values are Normal, Overridden, Disabled, Low, Timing Low, High, and Timing High. |
Normal Set Name: Control Status |
|
Cooling Mode |
Desired cooling mode of operation. |
Off Set Name: AHU HR Cl EW |
|
|
Heat Recovery OnOff |
V |
Binary signal to the Enthalpy Wheel. |
Off Set Name: Off/On |
|
Heat Recovery Percent Cmd |
V |
Contains the analog signal sent to the Enthalpy Wheel. |
0% |
|
Heat Recovery Suitability |
Indicates if the heat recovery may be used for cooling control, heating control, or unsuitable for either control. The enumeration set is Heat, Cool, or None. |
None Set Name: AHU HR Suit |
|
|
Heating Control Status |
V |
PID Status. The possible values are Normal, Overridden, Disabled, Low, Timing Low, High, and Timing High. |
Normal Set Name: Control Status |
|
Heating Mode |
Desired heating mode of operation. |
Off Set Name: AHU HR Ht EW |
|
|
HR-MAXOUT (Max Wheel Speed) |
Defines the maximum wheel speed which provides maximum heat transfer. |
65% |
|
|
HR-OUTSTATE (State) |
V, G |
Indicates the current operational mode of the output controller. |
Off Set Name: AHU HR Ht EW |
|
Limited Max Speed |
Defines the wheel speed when the module is in the Limited Max state. |
65% |
|
|
Low Limit Process Variable |
Low limit temperature process variable, normally connected to a sensor located in the exhaust duct after the Heat Recovery device. |
4 °C, 39 °F |
|
|
Low Limit Setpoint |
Low limit temperature setpoint. |
4 °C, 39 °F |
|
|
Output Overridden |
Indicates when the actual output that is controlled by this output controller is overridden by a user. |
False |
|
|
Output Position |
Provides the current Present Value of the output 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 |
Specifies the type of process that this output controller is controlling when the mode is T Control. |
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, and it may be connected to either Zone temperature, discharge air temperature, or exhaust air temperature. The latter signal is expected to come from a sensor in the exhaust duct upstream of the enthalpy wheel. |
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 |