WDE
25
© STULZ SpA . – all rights reserved EN/36B/08.2018
Heating (optional)
With the heating elements option, the units include an electric heating element. When the
temperature is low, the heating coil turns on (compressor off) and the free cooling damper is in
complete re-circulation position, in order to heat internal air. This mode is controlled by the C2020
controller.
Dehumidification (with ACTRHC1 accessory)
According to the signal of humidity inside the room, supplied by the optional humidity probe
ACTRHC1, the air conditioner electronic controller C2020 reduces evaporator fan speed.
Consequent air flow reduction causes a higher temperature difference between inlet and outlet air,
helping condensation of humidity in it.
4.3. Mechanical components
Structure
These machines are built using self-supporting panels made of painted galvanised sheet metal
to guarantee good corrosion resistance (not suitable for corrosive and saline environments). They
make the machine easy to inspect and, at the same time, offer adequate protection to its internal
components. The external panels are internally lined with a 3 mm layer of sound-absorbing material.
The internal components of the unit can be accessed by simply removing the cladding panels. This is
done by undoing their fastening screws.
Air filter
Belonging to class G4, it is designed to prevent large dirt particles present in the environment from
obstructing airflow through the evaporator. Its zigzag shape with 50 mm height implies a wide
filtering surface, reducing pressure losses and frequency of maintenance.
Free cooling air pre-filter
It is mounted on the middle frontal panel just behind the free cooling intake opening. Made of acrylic
material it belongs to efficiency class G2.
Condensate water tray
It’s located under the evaporator to collect the moisture from the internal air which condenses on the
surface of the heat exchanger during cooling. It is fitted with a union for external drainage.
Free cooling damper
This damper, fitted in units featuring the free cooling option, consists of a metal baffle powered by a
servomotor for directing inside and outside air flows. The damper body is made of galvanised sheet
metal.
