14
Fan Unit ELS-V..
Installation and Operating Instructions
– The following functions are implemented:
1. Start-up delay
Following the activation of the fan, operation begins after the set delay time. Thus, e.g. in case of joint activation/deacti-
vation with the light, a room can be entered temporarily, without the fan becoming operational. Factory setting approx.
45 seconds (adjustment with DIP switch).
2. Overrun
The fan will continue to run after the deactivation during the set time and it will then automatically deactivate. Factory
setting approx. 15 minutes (adjustment with DIP switch).
3. Automatic humidity control system
The humidity control system always controls the required ventilation or the highest stage for multi-speed types. The
microprocessor-controlled electronics detect two different types of humidity increase in the room air. It distinguishes
between a slow and rapid humidity increase.
– High air humidity (slow humidity increase)
In case of a slow humidity increase (e.g. due to washing, drying textiles, temperature reduction), the fan will be activated
above the set room humidity of 70 % RH (factory setting, using DIP switch) and it will run until the room humidity has
fallen by approx. 10 %, but at least for the set 15 minute overrun time.
– Event control (rapid humidity increase)
In case of a rapid humidity increase (e.g. due to showering, bathing), the fan will be activated before the set activation
threshold of 70 % RH is reached to eliminate the excessive humidity in the room as effectively as possible and to quickly
restore the comfort zone (40-70 % RH) in the room. As soon as the relative humidity has fallen to approx. 60 % RH (fac-
tory setting, using DIP switch), the fan will be deactivated, but no earlier than after the set overrun time of 15 minutes.
4. Runtime limit
In cases with constant, excessive amount of humidity, the fan will be automatically deactivated after two hours, e.g.
if the incoming air is above the set relative humidity of 70 % (e.g. in case of a stormy atmosphere in the summer
or if there is constantly damp laundry in the room) or in case of an insufficient air exchange rate due to small-sca-
le or blocked air vent openings. In this respect, there are two possible stop times depending on the situation:
a. Short stop time
The humidity has fallen below the activation threshold by the end of the overrun limit, but it has not yet reached the
deactivation threshold. The fan will then be deactivated, the short stop time of one hour will run.
Background: There was a humidity reduction during fan operation. However, the reduction was not enough to fall
below the deactivation threshold. A short stop time will be activated, because it is assumed that the humidity can be
effectively reduced after short break. Any humidity measurements are ignored during the stop time.
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The required ventilation stages can still be operated. The stop time will continue to run in the background.
Only mains deactivation and activation can delete the stop time.
b. Long stop time
The humidity has not fallen below the activation threshold by the end of the overrun limit. The fan will then be deactiva-
ted, the long stop time of six hours will run.
Background: Since the humidity value has not fallen below the activation threshold, it can be assumed that further
ventilation makes no sense. A long stop time will be activated. Any humidity measurements are ignored during the stop
time.
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The required ventilation stages can still be operated. The stop time will continue to run in the background.
Only mains deactivation and activation can delete the stop time.
A balance between minimised energy consumption and optimal humidity reduction is achieved with these
humidity curve control functions. Damp surfaces due to condensation and the associated risk of mould forma-
tion and unpleasant odours are largely avoided.
5. Pause function
Deactivation of automatic humidity control system and active operation
The automatic humidity control system and active demand-controlled ventilation can be deactivated for one hour by
switch or push button (push button for at least 0.5 sec.), see wiring diagram SS-881, SS-882 and SS-883 (excluding
three-speed type).
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When using a switch that is active for longer than one hour, the deactivation will be extended by another hour.
Push button operation within the 1-hour pause period will not cause an extension. A permanently active switch or a
control line permanently connected to the automatic deactivation input will lead to a permanent pause of the humidity
control system. The existing demand-controlled ventilation stages can still be operated. The input will be read un-in-
terrupted, so that the pause is reactivated immediately after fan operation via demand-controlled ventilation in case of
such operation.
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