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Installation and Operating Instructions
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NOTE
Central ventilation units AIR1 XH
If the sensor signal reaches the sensor limit, the unit will switch back to recirculation mode.
The recirculation mode will not work if the reduced, normal or boost timers are running at the same time, since it has
a lower priority.
4 .0 .5 Bypass
The bypass function contains 3 different scenarios:
– Night cooling
– Free cooling / Free heating
– Prevention of pressure losses
Night cooling
The bypass function can also be used for so-called "night cooling" in the summer months. This function takes advantage
of cool outside temperatures at night to cool the room during the night. The night cooling effect is heavily dependent on
the temperature differences between the intake air/supply and room air, the volume flow and the required cooling loads.
Night cooling never replaces air conditioning!
Start conditions:
Free night cooling is only activated if all of the following start conditions are met.
– The system has not been deactivated for less than 4 days.
– The outside temperature exceeded the set limit value (e.g. 22 °C) during the last operation.
– It is a certain time of day. E.g. 1 am to 6 am (adjustable).
– One of the following ventilation level is active: Manual minimal, Manual off (standby) or Timer minimal.
– A timer function will be active in the next 24 hours.
Stop conditions:
– The outside temperature is higher than the set start value (e.g. 18 °C) or lower than the set minimum value (e.g. 10 °C).
– The room temperature is lower than the set stop value (e.g. 18 °C).
– A ventilation stage other than those listed above is active.
– It is not the set time of day.
The start and stop conditions must be set in the commissioning assistant.
Free cooling / Free heating
This function opens the bypass under the conditions described below. This uses the intake air temperature for heating
or cooling.
1. If the unit has heating requirements:
Case 1 – If the supply air temperature < intake air temperature and the extract air temperature < intake air temperature,
then the bypass shutter is opened.
Case 2 – If the supply air temperature < intake air temperature and the extract air temperature > intake air temperature,
then the bypass shutter is closed.
2. If the unit has cooling requirements:
Case 3 – If the supply air temperature > intake air temperature and the extract air temperature > intake air temperature,
then the bypass shutter is opened.
Case 4 – If the supply air temperature > intake air temperature and the extract air temperature < intake air temperature,
then the bypass shutter is closed.
Prevention of pressure losses
If the supply air, extract air, intake air and exhaust air temperatures are equal, heat recovery is not required. The unit
opens the bypass shutter to prevent unnecessary pressure loss.
If the supply air temperature = intake air temperature = extract air temperature = exhaust air temperature, then the
bypass shutter is opened.
4 .0 .6 Overrun
The unit has an adjustable overrun function for ventilation stage selection via an external switch contact.
Thus, the ventilation unit will run for the set time after actuation of the switch contact for the respective ventilation stage.
Therefore, a push-button function is possible.
If the overrun time is set to 0,the ventilation unit will run until the corresponding switch contact is no longer actuated.
Adjustment of overrun time:
• Log on as User or Admin
• Call up the "Timer" menu
• Call up the "Overrun" menu
• Set the desired overrun time
Overrun
XXX min
Time in overrun
XXX min
OK
OK
OK
OK
55
OK
OK
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