Dehumidification (Sequence override)

Access 4.x

The Access allows override control of the selected sequence (usually the cooling sequence) to proceed with dehumidification of the supply air through condensation. Dehumidification overrides the cooling signal from the temperature controller so the output can be activated even if there is no cooling demand.The output will increase on increasing room/extract air humidity.

note: using cooling for dehumidification will increase the demand for heating the supply air, therefore placement for the re-heater should be considered.

Configuration example of the dehumidification (sequence "SEQ-C Cooling" override)
	Variable	Available options & Selection	Note
	Activate Humidity control
	Configuration > Functions > Function activation
	Humidity control	... \| Dehumidification \|…
	Configure function
	Configuration > Functions > Humidity control
	Humidity control	Dehumidification	Indication of what function has been activated
	Select sequence for dehumidify	... \| Cooling \|...	Sequence to override for dehumidification
	PID Settings
	Configuration > PID controllers > Dehumidification
	P-band	[100] %RH	PID settings for dehumidification signal
	I-time	[300] s
	D-time	[0] s
	PID output max limit	[100] %	max output of the PID can be limited
	Hardwired interface
	Configuration > I/O allocation settings > Analog inputs >
	Humidity room/extract air	Any available I/O	Mandatory - humidity sensor for reference
	Operational settings
	Data & Settings > Humidity control
	Humidity room/extract air	__ %	Actual measured RH
	Setpoint humidity room/extract	[50] %RH
	Operation overview
	Data & Settings > Operation overview > Humidity
	Humidity room/extract air	__ %	Overview of the function in action
	Setpoint humidity room/extract	[50] %RH
	Humidity control	__ %
	Humidity control mode	Not active \| Dehumidification
	Data & Settings > Operation overview > Cooling
	Cooling (SEQ-C)	__ %	Overview of the performance of the sequence
	Cooling start (SEQ-C)	Off \| On
	Cooling pump (SEQ-C)	Off \| On