9
v1.3
Notes:
In some special cases, the moisture may remain too high in the room, even if the flow is at its
maximum. This will be seen in those situations:
- The momentary abnormal weather conditions make that the indoor relative humidity may not be
lower than the set point (very hot and humid weather).
- A continuous generation of moisture is generated in the room and the ventilation system is
undersized (number of units is not sufficient).
In these two cases, it is possible to manually select level 1 (minimum flow).
CO2 mode:
When the AHU is equipped with a CO2 sensor, it can be operated in manual mode (level 1 and 5) or
in automatic mode (level 2, 3 and 4).
In manual mode, the AHU operates at its minimum level at level 1 and its maximum level at level 5,
regardless of the rate of CO2 in the room.
In automatic mode, the AHU continuously regulates the speed of his fans depending on the set point.
AHU therefore ensures that the CO2 in the room is at most equal to the requested value.
level
outflow
[m³/h]
CO2 rate
1
15
Undefined
2
Undefined
1700
3
Undefined
1400
4
Undefined
1100
5
75
Undefined
Notes:
In some special cases, the indoor air quality may remain too poor in the room, even if the flow is at
its maximum. This will be seen in those situations:
- Conditions of exceptionally poor air quality and probably temporary make that the indoor air
quality cannot be below the set point (air intake very close to a combustion engine,....).
- A continuous generation of pollution is generated in the room and the ventilation system is
undersized (number of units is not sufficient).
In these two cases, it is possible to manually select Level 1 (minimum flow).
5.3 Remarks
