Bypass - Helios AIR1 XC Serie Montage- Und Betriebsvorschrift

Installation and Operating Instructions
+
NOTE
Compact Ventilation Units AIR1 XC
Settings for the ventilation mode:
• Log on as User or Administrator
• Call up the "Temperature" menu
• Set the setpoint (temperature) for recirculation
• Set supply air fan offset (deviation)
→ Temperature
Fan control
Timer
Access rights
Temp. setpoint for
recirculation (supply air /
extract air / room))
XX.X °C
SAF offset for
frequency regulation
Recirculation: XX.X m³/h
The recirculation mode can be set as follows:
• Using the recirculation timer
• Using the external switch contact DI8
If the VOD timer and recirculation timer are active at the same time and no air quality sensors reach the sensor limits
(intensive ventilation), the unit will switch to recirculation mode.
If a connected sensor reaches the sensor limit, the recirculation mode will stop and the unit will run in sensor-controlled
operation (VOD).
If the sensor signal reaches the sensor limit, the unit will switch back to recirculation mode.
The recirculation mode will not work if the minimal, normal or intensive 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.
↑
OK OK
↓
↑
OK OK
↓
36
OK OK
OK OK
EN