EN/10.2021/i04 © STULZ S.p.A. – all rights reserved
WLA CompACT - TRANSLATIoN oF oRIGINAL INSTRUCTIoNS
WLA CompACT - TRANSLATIoN oF oRIGINAL INSTRUCTIoNS
with the provisions supplied by the manufacturer of the antifreeze liquid.
WARNING
In any case, the water supply and external temperature and minimum values must be
complied with, as well as the maximum percentage of glycol. These values are stated in
paragraph 6.2.
The corrective coefficients of the technical data according to the percentage of glycol used are
indicated in paragraph 6.2.1.
Filling the hydraulic circuit
With machine powered, but in OFF mode, fill the circuit completely with the filling cap. You can
use the point indicated with RI in the chiller hydraulic diagram as filling point (see “Hydro-cooling
circuits”). For the symbols, refer to “Symbols used in the manual”.
WARNING
Before starting the chiller, check the complete priming of the pump. To access the pump,
remove the chiller right panel
DANGER
Do not run the pump without water to prevent damage.
WARNING
The requirements of the liquid to be cooled are described in paragraph 6.1.
Do not contaminate the filling liquid with liquids or additives other than those indicated. Do not
mix products and/or additives of different brands.
To fill the pump correctly:
•
Bleed the air from the pump body (where provided). With the unit off, open the specific cap on
the top of the pump body and bleed the air.
•
Before starting the pump, make sure that the impeller rotates freely. If not, use a screwdriver on
the slot placed on the pump shaft on the fan side to rotate the impeller in both directions until
it is released.
•
The pump must never run dry to prevent the mechanical and hydraulic seal from permanent
damage.
•
The pump must not run with the supply inlet closed to prevent the pumped liquid and motor
from the risk of overheating.
•
To prime the pump correctly during start-up, fill the pump body, the tank intake pipe, and the
supply pipe with water. Otherwise, performance will be poor and damage may occur on the
hydraulic part.
WARNING
Once the circuit is filled, the antifreeze function is essential. Therefore, make sure that the
circulation pump is powered with disconnection switch in position ON. Moreover, make sure
that the consent signal from the chiller is correctly connected to the pump. Also make sure
that the pump valve is open.
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