Primary States (Humidification Packaged Unit) - 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: The proportional device is closed, and the Hum-O output is set to 0%.

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

  • H Control: When operating in the H Control mode, the activity attempts to control the process variable (either return relative humidity or zone relative humidity) to the setpoint. As the humidity drops below the setpoint, the proportional valve opens to add humidity into the air stream. This mode is the normal humidification mode.

  • Limited H Control: When operating in the Limited H Control mode, the activity attempts to control the discharge relative humidity to the setpoint. As the humidity drops below the setpoint, the proportional valve opens to add humidity into the air stream. This mode is the humidity high limit mode and is intended to prevent the discharge air from becoming too humid.

Table 1. H Control Command Hierarchy

Mode

State

Off

Off

H Control

H Control

Limited H Control

H Control

Hold

Hold

Table 2. Limited H Control Command Hierarchy

Mode

State

Off

No Limit Control

H Control

No Limit Control

Limited H Control

Limited H Control

Hold

Hold