Primary States (Heating Staged Outputs with Low Limit) - 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

  • Off: Turn everything off. The Heating Percent Cmd is set to 0%. The MSC module observes any minimum on time.

  • Max: The Heating Percent Cmd is set to 100%.

  • Limited Max: The Heating Percent Cmd is set to the Limited Max Value. This state may be used for unoccupied heating.

  • Hold: Hold the outputs at their current position.

  • Instant Shutdown: Turn everything off. The Heating Percent Cmd is set to 0%. The MSC module does not observe any minimum on time.

  • T Control: Use the heating device to control the Process Variable. The module controls the output in order to maintain the Process Variable at the Setpoint. The Heating Percent Cmd adjusts between 0% and 100%.

  • LL-T Control: Use the heating device to control the Limit Variable. The module controls the output to maintain the Limit Variable at the Limit Setpoint. The Heating Percent Cmd adjusts between 0% and 100%.

  • Low OA Temperature Startup: This mode activates the T Control state section, but limits the rate at which the valve can close so that the unit can safely come into control (typically used for 100% OA units with low OA temperatures at startup).

Table 1. Heating Staged Outputs with Low Limit Command Hierarchy

Proof of Airflow

Mode

PID Tuning Reset

State

Fault

*

*

Instant Shutdown

Not (Fault)

Instant Shutdown

*

Instant Shutdown

Off

*

Off

Max

*

Max

Hold

Reset 1st PID

T Control

Hold

Reset 2nd PID

LL-T Control

Hold

*

Hold

LL-T Control

*

LL-T Control

T Control

*

T Control

Limited Max

*

Limited Max

Low OA Temperature Startup

*

T Control