Primary States (Min OA Fan Variable Capacity Flow Control) - 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

  • No Flow: This mode closes the OAD and de-energizes the minimum injection fan.

  • Max Flow: This mode opens the OAD and energizes the minimum injection fan.

  • Start: This mode opens the OAD and the minimum injection fan is turned off. This mode sequences the damper and the fan to ensure the damper is opening before the fan is energized.

  • Min Flow Control: The minimum OA Damper is opened, and the flow is controlled by the PID block. The PID block increases the injection fan speed as the flow drops below the flow setpoint. This module does not have flow setpoint reset based on CO2 or some other indoor air quality parameter, but another module could be connected to the flow setpoint input which does reset the flow setpoint.

  • Hold: Holds the outputs at their current position. If the Output Overridden is true, then the Output Position input is passed to the Cooling Percent Cmd.

Table 1. Min OA Fan Variable Capacity Flow Control Command Hierarchy

Mode

Minimum OA Flow Reliable

Unrel Flow Mode

Min Flow Control Enable

Damper Ready

PID Tuning Reset

State

*

*

*

*

False

*

Start

*

*

*

*

True

*

Max Flow

*

*

*

*

*

*

  

Hold

        

Reset 1st PID

Min Flow Control

Hold

*

*

*

*

*

Hold

No Flow

*

*

*

*

*

No Flow

Max Flow

*

*

TRUE

TRUE

*

Max Flow

FALSE

*

Start

FALSE

*

*

No Flow

Emergency Flow

*

*

*

TRUE

*

Max Flow

FALSE

*

Start

Min Flow Control

TRUE

*

TRUE

TRUE

*

Min Flow Control

FALSE

*

Start

FALSE

*

*

No Flow

FALSE

No Flow

*

*

*

No Flow

 

Flow

TRUE

TRUE

*

Max Flow