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Off: The proportional device is closed, and the Hum-O output is set to 0%.
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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.
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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.
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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.
Mode |
State |
---|---|
Off |
Off |
H Control |
H Control |
Limited H Control |
H Control |
Hold |
Hold |
Mode |
State |
---|---|
Off |
No Limit Control |
H Control |
No Limit Control |
Limited H Control |
Limited H Control |
Hold |
Hold |