Primary States (2 Pipe Proportional Valve 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 Percent Cmd is set to 0%.

  • Max: Open the valve. The Percent Cmd is set to 100%.

  • Limited Max Heating: The valve is opened to the Limited Max Heating Value. This state may be used for unoccupied heating.

  • Limited Max Cooling: The valve is opened to the Limited Max Cooling. This state may be used for unoccupied heating.

  • Hold: Hold the outputs at their current position.

  • Water Flush: The valve is opened to the Water Flush Position.

  • Heating T Control: Adjust the valve 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 Heating Setpoint. The Valve Percent Cmd and the Percent Cmd are adjusted between 0% and 100%.

  • Cooling T Control: Adjust the valve 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 Cooling Setpoint. The Valve Percent Cmd and the Percent Cmd are adjusted between 0% and 100%.

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

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

  • Low OA Temperature: The valve is opened to the Low OA Temperature Position when the OA Temperature is less than the Low OA Temperature Setpoint.

  • Remain In Control: Modulate the valve to control the Limit Variable to the Limit Setpoint. If the Limit Variable is reliable, the module controls the output in order to maintain the Limit Variable at the Limit Setpoint. This mode should only be used as a shutdown strategy to add energy to the duct when the fan is off. It should not be used for general temperature control.

Table 1. 2 Pipe Proportional Valve with Low Limit Command Hierarchy

Summer

Winter

Cooling Mode

Heating Mode

Low Limit Process Variable is Reliable

OA Temperature is Reliable

PID Tuning Reset

State

*

Hold

*

*

*

Reset 1st PID

Cooling T Control

Hold

*

*

*

Reset 2nd PID

Heating T Control

*

Hold

*

*

Reset 1st PID

Heating T Control

*

Hold

*

*

Reset 2nd PID

Cooling T Control

Winter

*

Off

*

*

*

Off

Hold

*

*

*

Hold

Water Flush

*

*

*

Water Flush

Max

*

*

*

Max

Limited Max

*

*

*

Limited Max Heating

T Control

*

*

*

Heating T Control

Failsoft

*

*

*

Failsoft Heating

Low OA Temperature

*

TRUE

*

Low OA Temperature

*

FALSE

*

Limited Max Heating

Remain In Control

TRUE

*

*

Remain In Control

FALSE

*

Failsoft Heating

Summer

Off

*

*

*

*

Off

Hold

*

*

*

*

Hold

Water Flush

*

*

*

*

Water Flush

Max

*

*

*

*

Max

Limited Max

*

*

*

*

Limited Max Cooling

T Control

*

*

*

*

Cooling T Control

Failsoft

*

*

*

*

Failsoft Cooling

Low OA Temperature

*

*

TRUE

*

Low OA Temperature

*

FALSE

*

Limited Max Cooling