Evap 2
¹ See chapter 10 for version adjustment
Section 2 – Operation
The purpose of the Evap is to humidify air passing through wetted media in an energy-efficient, silent and safe
way. The adiabatic humidification process is carried out in the humidifier unit and increases the humidity in the air
supply to the room.
The Evap humidifier must be installed in the air duct to the building.
2.1 Principle of operation
The Evap is installed in the air duct to the building. The humidifier operates completely independently and
switches on when the (absolute) outside air humidity becomes too low.
The switching is linked to the prevailing outside temperature, using an average meteorological year as the
reference year. This value is controlled by the T3 temperature sensor, which must be installed in the outdoor air
duct. The default temperature setting for triggering the Evap humidification unit is 12°C.
The Evap then humidifies the supplied air until that air reaches a maximum relative humidity of 78%.
The integrated PTC preheater is only operational when the air temperature is lower than 17°C after
humidification. This limits the energy usage of the PTC preheater.
The maximum moisture supply capacity is 4 kg/h (approx. 4 liters per hour) and is highly dependent on the air
temperature and air flow across the Evap humidifier. The maximum air flow capacity of the Evap is 600 m3/h
2.2 Safety
The water is legionella-safe because of the built-in, patented, legionella-free LegioSafe water distributor. The
supply water first passes through the LegioSafe before it moistens the matrix. As a result there is no risk for the
inhabitants of houses or buildings. Only fresh water is used. There is no recycling of water. The matrix is
completely dry if there is no demand for humidification.
The SHC80 duct sensor also supplied measures the relative humidity and temperature in the duct after the Evap.
This position guarantees the maximum operation and condensate-free ducts under the normal conditions of use
of our design.
The Evap air humidifier has several safety features:
1. A mechanical Klixon temperature switch that switches off the PTC preheater if the set temperature is
exceeded.
2. An additional temperature sensor in the humidifier unit that also switches off the PTC preheater if the
set temperature is exceeded.
3. Legionella shutdown protection. If the air humidifier unit is switched off for 72 hours, the water valve will
automatically open and flush the pipes and the Evap cassette for 30 seconds to prevent legionella from
forming.
4. Water valve security. The filter in the water supply coupling ensures that dirt can not damage the water
valve.
