Attributes (Occupied Sequencing [AHU MASD w HR]) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 16.0

Controller Tool Help
Product
Controls > Control Tools > 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 MASD w HR) module.

Table 1. Occupied Sequencing (AHU MASD w HR) Attributes

Name

Description

Default Value

AHU-STATE (State)

Represents the current state generated by the sequence.

Satisfied

See Primary States (Occupied Sequencing [AHU MASD w HR]).

Cooling Control Status

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

Normal

Set Name: Control Status

Cooling Setpoint

Contains the setpoint the state generator attempts to control when cooling.

13 °C, 55 °F

Damper Control Status

Value fed back from the economizer 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

Fast Sequence Enabled

Indicates whether a change to a Satisfied state occurs when a setpoint changes as described in the Setpoint Threshold input.

False

Free Cooling Available

Contains the output of the Economizer Availability module.

False

Heat Recovery Control Status

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

Normal

Set Name: Control Status

Heat Recovery Modulated

Indicates whether the heat recovery is modulated, where True equals modulated and False equals not modulated.

False

Heating Percent Cmd

Indicates the current command from the heating controller that operates first. This signal comes directly from the PID in the output controller module.

0.0

Display Units: %

Heating Setpoint

Contains the setpoint the state generator attempts to control when heating.

13 °C, 55 °F

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

Indicates the preheat command used to prevent the preheat from cycling off and on unnecessarily when the AHU starts.

0.0%

Process Variable

Contains the value compared to the setpoint and is used to determine whether heating or cooling is required.

13 °C, 55 °F

Reheat Control Status

Value fed back from the reheat PID controller necessary for the sequencer to determine what actions to take.

Normal

Set Name: Control Status

Setpoint Threshold

Indicates how much the Cooling Setpoint must increase/Heating Setpoint must decrease to cause a change to a Satisfied state from a Cooling/Heating state.

1 °C, 2 °F

Zone Control

Contains a Boolean input that is True when the unit is Zone Control without Cascaded DA-T setpoint reset.

False