Fan compensation

Access 4.x

Fan compensation

Regardless of active fan level, the actual fan speed can be adjusted if it is necessary by defining the compensation curves.

The function allows to set up to three independent curves. They can be used to set a compensation based on the configured analogue input signal (temperature, pressure, flow humidity, CO2).

The compensation can be selected to apply to both fans or only one of the fans, to low, normal, high or all speeds and only when defrosting.

The curve has three parameter pairs which correspond to the value of the compensation at three different related sensor values.

Configuration example for CO2 level related fan speed compensation
	Variable	Available options & Selection	Note
	Activate fan compensation curves
	Configuration > Functions > Function activation
	Fan compensation curves	\| Yes \| No \|
	Configuration of the fan compensation curve
	Configuration > Functions > Fan compensation curve 1
	Fan level	\| All levels \| Low speed \| Normal speed \| High speed \| Low + Normal speed \| \| Normal + High speed \|	Selection of fan, fan level and operation mode when the compensation is active
	Mode	\| Inactive \| In all modes \| When defrosting \|
	Fan	\| Supply air + Extract air \| Supply air \| \| Extract air \|
	Sensor	… \| CO2 room/extract air \| …	Reference sensor for compensation
	Configure inputs
	Configuration > I/O allocation settings > Analog inputs
	CO2 room/extract air	Any available I/O
	Operational settings for fan compensation curves
	Data & Settings > Fan control > Fan compensation curves > Fan compensation curve 1 >
	Fan level	All levels	Overview of configuration
	Mode	In all modes
	Fan	Supply air fan + Extract air fan
	Sensor	CO2 room/extract air

	Compensation curve	Sensor value	Compensation
	Data & Settings > Fan control > Fan compensation curves > Fan compensation curve 1 >
	Lowest sensor value	500 ppm	0 Pa
	Middle sensor value	600 ppm	35 Pa
	Highest sensor value	800 ppm	60 Pa