Table 1 describes the attributes used by the Economizer Availability RA-T Compare module.
|
Name |
Type 1 |
Description |
Default Value |
|---|---|---|---|
|
Change Over Differential |
Determines whether the economizer is available. When the OA Temperature is less than the Change Over Temperature by this value, free cooling is available. |
4.5 °C, 8 °F |
|
|
ECON-AVAILABLE (Free Cooling Available) |
G, V |
Displays a value of True when increasing the volume of outside air can reduce the cooling coil load. This attribute contains a value of False when the volume of outside air should be at the minimum required for ventilation. |
False |
|
ECONSWO-SP (Change Over Temperature) |
Specifies the change over dry bulb temperature used to determine whether the economizer is available. When the OA Temperature is greater than this value, the economizer is not available. |
20 °C, 68 °F |
|
|
OA Temperature |
Contains the dry bulb temperature of the outside air. |
25 °C, 77 °F |
|
|
Return Air Temperature |
Provides the dry bulb temperature of the return air. |
20 °C, 68 °F |
|
|
Supply Fan Status |
Provides the operating status of the AHU supply fan (Running = True, Off = False). |
True |
|
|
Temp Difference SP |
Determines whether the economizer is available. When the Return Air Temperature minus the OA Temperature is greater than this value, the economizer is available. |
3 °C, 5.5 °F |
|
|
Temp Difference Differential |
Determines the value used to disable the economizer. When the Return Air Temperature minus the OA Temperature is less than the Temp Difference SP, the economizer is disabled. |
1 °C, 2 °F |