Primary States (Heating FBPD 2 Position Valve with Low Limit) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 13.1

Controller Tool Help

Brand
Johnson Controls
Metasys
Product name
Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
13.1
Revision date
2019-12-04
Language
English
  • Off: Turn everything off. The Damper Percent Cmd is set to 0%. The Pump OnOff is turned off and the Valve OpenClose is commanded closed.

  • Max: The valve is open, and the damper is opened to 100% face. The Damper Percent Cmd is set to 100%.

  • Hold: Hold the outputs at their current position.

  • Water Flush: The damper is 0% face, the valve is opened, and the pump is on.

  • Limited Max: The valve is open, and the damper is opened to the Limited Max Value. This state may be used for unoccupied heating or cooling.

  • T Control: Open the heating valve and adjust the damper output to control the Process Variable. If the Process Variable is reliable, the module controls the output in order to maintain the Process Variable at the Setpoint. The Damper Percent Cmd is adjusted between 0% and 100%.

  • LL-T Control: Open the heating valve and adjust the output to control the Limit Variable. If the Limit Variable is reliable, the module controls the output in order to maintain the Limit Variable at the Limit Setpoint. The Damper Percent Cmd is adjusted between 0% and 100%.

  • Low OA Temperature: The valve is open and the damper is opened to 100% when the OA Temperature is less than the Low OA Temperature Setpoint.

  • Failsoft: The valve is opened, and the damper is opened to the Failsoft Value. This state may be used when the control temperature is unreliable.

  • 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 FBPD 2 Position Valve with Low Limit Command Hierarchy

OA Temperature isReliable

Mode

PID Tuning Reset

State

*

Off

*

Off

Max

*

Max

T Control

*

T Control

LL-T Control

*

LL-T Control

Hold

Reset 1st PID

T Control

Hold

Reset 2nd PID

LL-T Control

Hold

 

Hold

Water Flush

 

Water Flush

True

Low OA Temperature

 

Low OA Temperature

False

Low OA Temperature

 

Failsoft

*

Limited Max

 

Limited Max

Failsoft

 

Failsoft

Low OA Temperature Startup

 

T Control