Primary States (Damper Control for Relief Fan) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool

Primary States (Damper Control for Relief Fan) - 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

Pressurize: This mode opens the OAD and closes the RAD.
Depressurize: This mode closes the RAD and OAD.
Close: This mode opens the RAD and closes the OAD.
Purge: This mode opens the OAD and closes the RAD.
Min OA: This mode moves the OAD and RAD to the appropriate position for minimum outdoor airflow.
Hold: This mode holds the dampers in their last position.
Ramp Min OA: This mode ramps the OAD to the minimum position and ramps the RAD to 100%.
Ramp Open: This mode ramps the OAD to 100% and the RAD to 0%.
T Control: This is the free cooling mode. The OAD and the RAD is modulated to allow outdoor air for cooling purposes. The OAD modulates from minimum position to 100%. If more outdoor air is required, the RAD modulates from 100% to 0%.

Table 1. Damper Control for Relief Fan Command Hierarchy
Mode	FSCS OAD Cmd ¹	PID Tuning Reset	FSCS RAD Cmd¹	State
*	!Auto	*	*	FSCS Control
*	Auto	*	!Auto
FSCS Control	Auto	*	Auto
Pressurize	Auto	*	Auto	Pressurize
Depressurize	Auto	*	Auto	Depressurize
Close	Auto	*	Auto	Close
Purge	Auto	*	Auto	Purge
Min OA	Auto	*	Auto	Min OA
Hold	Auto	Reset 1st PID	Auto	T Control
Hold	Auto	*	Auto	Hold
Ramp Min OA	Auto	*	Auto	Ramp Min OA
Ramp Open	Auto	*	Auto	Ramp Open
T Control	Auto	*	Auto	T Control

¹ The FSCS Cmds (OAD, RAD) are not used.