Vent-Axia MV250H(RF) Operating Instructions Manual - page 7
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c) Humidity Response :
The Multivent reacts automatically to an increase in %RH above the set point value and the manner in which this
triggers will increase airflow depending on the original speed setting, as follows:
Low Speed Setting:
If high humidity is detected, the fan speed increases to medium for 30 minutes. At
the end of this period, if high humidity is still detected, the fan speed increases to
high for 15 minutes. At the end of this period, if the humidity is low, the fan returns to
its original low setting, but if still high, the fan reverts back to medium speed for 30
minutes and so on.
Medium Speed Setting:
If high humidity is detected, the fan speed stays at medium speed for 30 minutes. At
the end of this period if high humidity is still detected, the speed increases to high
for 15 minutes and drops back to the original medium speed setting at the end of
this
period.
High Speed Setting:
If high humidity is detected there is no speed change. However, at the end of 30
minutes the boost time-out will automatically reset the fan speed back to low.
In all the automatic humidity operating modes, it is possible to override any humidity cycles in progress and switch
the fan to any other speed. However, if high humidity is still present, the unit will revert back to the appropriate
automatic humidity cycle operation.