AirTech ACR35-SELV Installation And Wiring Instructions - Page 7

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Boost time

The boost setting allows the boost timer to be adjusted from 1-30 minutes, the default

is 15 minutes. This option may also be disabled, thus removing the option from the

menu and setting the overrun to 0.

Inbuilt Ambient Response Humidistat with Rapid Rise Detection

The humidity threshold setting defines at what relative humidity the fan will trigger,

adjustable from 40% to 90% rH. The fan increases in speed slowly between the trickle

and boost speeds between the trigger %rH and +10%. The trigger point will

automatically adjust if the temperature drops below 18C to prevent nuisance triggering.

The fan also incorporates a rapid rise function to detect rapid rises in humidity when the

ambient %rH is under the threshold setting. If a rapid rise is detected the fan will

increase in speed proportionally between the trickle and boost settings until the

humidity lowers again.

Comfort mode

 With comfort mode disabled, the fan will go into boost as soon as an LS (Light

Switch) input is detected and over-run for the set period after LS is disconnected.

 With comfort mode enabled, the fan will remain off / in trickle up to a maximum of

20 minutes. Once LS is deactivated, fan will run at boost mode for the length of

time LS was present up to a maximum of 20 minutes plus the set over-run time.

If the LS was activated for < 3 minutes, no boost will occur to prevent nuisance

activations.

Fan Control Mode

There are 3 modes for fan speed control. Wall, ducted and constant airflow/ volume

(CV) mode (CV - Pro models only). In wall or ducted mode, the fan speeds are pre-

determined at the factory and does not use the airflow sensor.

In CV mode (Constant Airflow/Volume), the fan will automatically adjust the fan speed

to maintain the desired airflow. After the first 15 minutes of operation the fan enters

calibration mode to determine the most efficient mode of operation.

In some circumstances it may be necessary to reset the calibration settings (if the fan

was covered to prevent dust/damage/or poor weather outside).

Reset the calibration by configuring the fan for wall or duct mode (F-0 or F-1), turn the

product off and on and re-configure back to CV mode (F-2).

The fan will calibrate after 15 minutes or by holding the pullcord for 5 seconds.

Pullcord

Switches the fan from trickle to boost (for boost overrun time)

o If the overrun time has been set to 0 (disabled), a default overrun duration

of 5 minutes will take place.

This will override LS comfort mode, boosting the fan immediately

An activation when a Pullcord/LS (Light Switch) boost is already active shall cancel

overrun timer (RH boost sources remain unaffected)