Attributes (Occupied Sequencing [AHU 100% OASD]) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 16.0

Controller Tool Help
Product name
Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
16.0
Revision date
2023-10-02

The following table describes the attributes used by the Occupied Sequencing (AHU 100% OASD) module.

Table 1. Occupied Sequencing (AHU 100% OASD) Attributes

Name

Description

Default Value

AHU-STATE (State)

Represents the current state generated by the sequence

Satisfied

See Primary States (Occupied Sequencing [AHU 100% OASD]) .

Cooling Control Status

Contains the value fed back from the mechanical cooling PID controller necessary for the sequencer to determine what actions to take.

Normal

Set Name: Control Status

Fan Ready

Comes from the Start/Stop Sequencer and indicates that the fans and dampers have been sequenced properly.

False

Heat Recovery Control Status

For proportional heat recovery devices, displays the value fed back from the heat recovery device PID necessary for the sequencer to determine what actions to take.

Normal

Set Name: Control Status

Heat Recovery Modulated

Used to tell the state machine if the heat recovery is modulated or not. True means modulated, and False means not modulated.

False

Preheat Control Status

Contains the value fed back from the preheat PID controller necessary for the sequencer to determine what actions to take.

Normal

Set Name: Control Status

Preheat Percent Cmd

Position of the output controller used to prevent the preheat device from unnecessarily cycling off then back on as the air handling unit starts up.

0.0%

Process Variable

Discharge air temperature. It is the variable that is compared to the setpoint to determine whether it is necessary to heat or cool the discharge air.

13 °C, 55 °F

Setpoint

Contains the discharge air temperature setpoint the state generator attempts to control.

13 °C, 55 °F