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Operating and installation instructions
8.4. Standby operation
The air humidification unit is in the Standby mode. If the relative humidity set is lower by more than 5 %, the air humidification unit
switches on, if it is enabled.
8.5. Starting phase of the active air humidification / switch-on sequence
The drain pump switches on first so as to completely drain potential residual water from the humidifier tank. At the same time, fresh
water is then filled into the humidifier tank, the UVC tube is switched on, and the rotor is activated.
8.6. Active air humidification / regular operation
During the active air humidification process, humidity and temperature control take place at the same time:
8.6.1 HUMIDITY CONTROL
The air humidity is regulated via the water level in the humidifier tank and therefore via the part of the rotor lamella surface that is
wetted with water. When the water level increases, the lamellae of the rotor immerse deeper into the water, thus enlarging the wa-
ter-wetted surface on the rotor lamellae. The air flowing over it absorbs moisture via evaporation on the wet lamella surfaces.
8.6.2 EVAPORATION PERFORMANCE
The evaporation performance always depends on the air inlet conditions. Very dry and warm air can absorb more moisture than air
that is already saturated or cold. The maximum possible evaporation with typical winter conditions is approximately 7 g/m³. In this
way it is possible to, for instance, bring dry air with an inlet condition of 18 °C to an outlet condition of 25 °C with 60 % RH.
This approximately corresponds to a maximum possible evaporation of 1.8 l/h (with 250 m³/h) for the KWL HBX 250, and 3.6 l/h (with
500 m³/h) for the KWL HBX 500.
Note: These data may always show slight deviations in practical applications.
In the case of air inlet temperatures above 25 °C, a max. humidification to 60 % RH cannot be ensured!
8.6.3 TEMPERATURE CONTROL
The air outlet temperature of the humidification unit is measured via the temperature sensor integrated into the unit.
Depending on the unit type, the air at the inlet to the humidification unit is heated via an electric PTC heater battery (unit type "E") or a
hot water heater battery (unit type "W").
Note: In the case of hot water heater batteries, the minimum flow temperature must be observed – see Chapter 10. Technical
data.
8.7. Controlled switch-off / switch-off sequence
Controlled switch-off is initiated by the regulation system, for example when, due to the detection of a fault message, the air humidifi-
cation unit changes from the operating status to the standby mode, or when the unit is switched off. In this process, first the water in
the humidifier tank is completely drained, while the rotor lamellae continue rotating for approx. 20 minutes. The UVC tube remains in
operation during the overtravel time.
8.8. Daily water change
For hygienic reasons, a complete water change takes place every 24 hours in the humidifier tank. The time for this can be individually
chosen by the operator (factory setting 3 pm) and is defined in the "Settings" menu item.
KWL
Hygrobox KWL HBX EH/WW
®
13
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