© STULZ S.p.A. – all rights reserved IT/10.2021/i04
WLA CompACT - TRANSLATIoN oF oRIGINAL INSTRUCTIoNS
accessed by removing the front panel.
The condenser cooling air is suctioned from the front side and discharged on the rear by means
of the specific grid in the closing panels.
The inlet and outlet water fittings are located on the rear right, whereas additional hydronic
components (circulation pump and storage tank) are found on the chiller right side.
5.4.
Components of the refrigerant circuit
The compressor compresses the refrigerant gas, bring it to higher temperature and pressure.
Through the condenser, the hot gas is cooled and liquefied, releasing hot to the external air.
Pushed through the electronic expansion thermostatic valve, the liquid refrigerant lose pressure
and its prepares for the evaporation. This takes place in the evaporator, where the refrigerant
absorbs the heat of the warm water or of the mixture to the treated, which is therefore cooled.
5.4.1 Compressor
According to the cooling capacity, compressor type changes: see below the table with relation
between size and compressor type. The compressor has thermal protection from overload.
Size
Compressor
WLA02
Alternative piston
WLA03
Alternative piston
WLA05
Rotary vane
WLA08
Rotary vane
WLA10
Scroll
WLA13
Scroll
5.4.2 Condenser
The condenser is copper-aluminium type, with copper pipes and aluminium fins. The chiller
cannot be use in environments with aggressive atmosphere.
On request there is the possibility to have the exchanger with cataphoresis treatment, tested
to resist with salt mist > 1000h. Other particular treatments for aggressive environments can be
evaluated on request.
5.4.3 Fan
Installed in the rear side of the condenser, it’s non-ductable suction type. The fan, with metallic
blades, it has metallic protection grid.
5.4.4 Evaporator
Plate condensers are used, made in stainless steel AISI 316 and brazed AISI 304.
WARNING
The liquid to be cooled must be conform to the prescriptions reported in paragraph 6.1.
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