Primary States (Humidification Proportional Steam Output) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 16.0

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. In this mode, both the discharge humidity limit and normal humidity controllers are active at the same time. By having both controllers active, the program determines when it is no longer necessary to operate in this mode.