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Frequently Asked Questions

Terms of use of the information written in the area FAQ.Leggi risposta »
THE INFORMATION IN THE AREA "FAQ - Frequently Asked Questions" DON'T REPLACE THE CAREFUL READING OF THE MANUAL OF USE AND THE PAPERY DOCUMENTATION PROVIDED WITH THE CHILLERS. After reading questions and relative answers, in case of need, contact the local After Sales Service or WINUS customer care. Remember to inform the operator about MODEL/TYPE of the chiller and SERIAL NUMBER written in the nameplate of the machine.
Why to use the antifreeze mixture? . . . Also when the chiller is used only to produce water at positive temperature (>2°C)? Leggi risposta »
Contrary to what you might think, the correct antifreeze mixture (55% water + 45% propylene glycol) always have to be used, also when the chiller is programmed only to produce water at positive temperatures (>2°C). In fact, already when water is produced at 10°C (noticed by the glycol mixture thermostat) inside of the evaporator, where happens the thermal exchange between mixture and refrigerant gas R-404A, the temperature is approximately -1 °C. If glycol is not used, the ice formation between the evaporator plates causes the decreasing of the thermal exchange and, most important, with the increase of volume causes damages and the break-up of the plates.
Why and when are suggested PERIODICAL CHECKS on GLYCOL MIXTURE?Leggi risposta »
Since the anticorrosive characteristic of the antifreeze mixture in the cooling plants are destined to decrease physiologically, it is advisable to check periodically its state, at least every two years. Two types of analysis are recommended: a) PH DETERMINATION (not lower than 7,5). b)ALKALINITY OF RESERVE (not lower than 5). Remember that it is necessary to check if the concentration of the mixture is correct (55% of water and 45% of antifreeze propylene glycol) through the measurement of the refractive index. Why periodical checks? To safeguard the integrity of pipelines in the cooling plant, maintaining constant the anticorrosive properties of the antifreeze mixture. When the mixture, that should be colourless, becomes yellowish/amber, means that the glycol has already exhausted its properties and that it is corroding parts of the circuit.
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