Attributes (Economizer Availability RA-T Compare) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 15.0

Controller Tool Help

Brand
Johnson Controls
Metasys
Product name
Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
15.0
Revision date
2022-11-18
Language
English

Table 1 describes the attributes used by the Economizer Availability RA-T Compare module.

Table 1. Economizer Availability RA-T Compare Attributes

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

1 C - Configuration Mode Only, G - Default Element (Generated State, if applicable), SC - Simulation and Commissioning Modes Only, V - Calculated Value (Outputs)