WDE
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EN/36B/08.2018 © STULZ SpA – all rights reserved
Air flow diagram (example of size 1)
4.4. Cooling components
The unit comprises a hermetic cooling circuit consisting of a compressor, condenser, refrigerant
filter, thermostatic valve and evaporator. The air inside the shelter is cooled without coming into
contact with the external air in cooling mode.
The system works as follows: the compressor compresses the refrigerant gas bringing it to a high
pressure and temperature. The hot gas, by going through the condenser, is cooled and liquefied thus
releasing heat to the air in the environment. Pushed through the thermal expansion valve, the liquid
refrigerant loses pressure, which makes it prone to evaporation. This takes place in the evaporator,
where the refrigerant absorbs the heat of the warm air from the shelter, which is therefore cooled.
The circuit components are connected together by copper piping, appropriately welded to ensure a
greater seal. Schrader service valves are fitted internally on the compressor intake and return lines.
Refrigerant
The refrigerant that is used is R407C (HFC). Optional: R134a (HFC).
