Primary States (Heat Pump Staged Compressors) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 16.0

Controller Tool Help

Brand
Johnson Controls
Metasys
Product name
Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
16.0
Revision date
2023-10-02
Language
English

Heating Mode

  • Off: Set the Percent Cmd and Heating Percent Cmd to 0%. Instant Shutdown is issued to the MSC and turns off all the stages.

  • Max: Set the output for maximum heating when in a heating configuration. The Common Percent Cmd is set to 100%. This value then feeds through the MSC and the stages turns on accordingly based on the timer settings. See the MSC section for more information.

  • Control: Adjust the output to control the Process Variable when in a heating configuration. As the Common Percent Cmd varies, it causes changes to the enabling of the staged outputs from the MSC. If the Process Variable is reliable, the module controls the output in order to maintain the process variable at the Setpoint. Otherwise the Common Percent Cmd output is set to 0%. See the MSC section for more information.

  • Failsoft: Set the Percent Cmd, Heating Percent Cmd and Cooling Percent Cmd output to the 0%.

  • Hold: Resets the PID primitive’s tuning parameters to those from the last Transfer to Device values. If this is the Heating Mode and PID Tuning input is Normal, the module goes to an off state.

Cooling Mode

  • Off: Set the Percent Cmd and Cooling Percent Cmd to 0%. The MSC turns off all the stages, but proceed through the minimum on timers. See the MSC section for more information.

  • Control: Adjust the output to control the Process Variable when in a cooling configuration. As the Common Percent Cmd varies, it causes changes to the enabling of the staged outputs from the MSC. If the Process Variable is reliable, the module controls the output to maintain the process variable at the Setpoint. Otherwise the Common Percent Cmd output is set to 0%. See the MSC section for more information.

  • Failsoft: Set the Percent Cmd and Cooling Percent Cmd output to 0%.

Table 1. Heat Pump Staged Compressors Command Hierarchy

Cooling Mode

Heating Mode

 

PID Tuning Reset

State

Hold

*

*

Reset 1st PID

Control Heating

Hold

*

*

Reset 2nd PID

Control Cooling

Hold

*

*

*

Hold

*

Hold

*

Reset 1st PID

Control Heating

*

Hold

*

Reset 2nd PID

Control Cooling

*

Hold

*

*

Hold

*

*

Off

 

Off

*

*

Max Heating

*

Max Heating

*

*

Transition to Cooling

*

Transition to Cooling

*

*

Transition to Heating

*

Transition to Heating

*

*

Control Cooling

*

Control Cooling

*

*

Control Heating

*

Control Heating

*

*

Idle

*

Idle