79 © STULZ GmbH – all rights reserved EN/09.2019/G41
cybercool 2 screw original insTrUcTions
Refrigerant charge - Tightness, Quantity and Purity
Tightnes of the refrigerant circuit
-
Quantity
An insufficient charge causes the formation of bubbles in the sight glass or in extreme cases the triggering of
the LP-switch. An operation with an insufficient refrigerant quantity over a longer period leads to a reduction
of cooling capacity and to high superheating temperatures, which have a disadvantageous effect on the com-
pressor lifetime.
If a leak is detected:
rel
.
evacuate the refrigerant circuit resp. the closed off section by a vacuum pump.
An overfilling of the circuit makes the condensation pressure rise and by that the power consumption of the
After repairing a leak, check the refrigeration circuit on tightness within one month.
Purity
Bubbles in the sight glass indicate that the charge is insufficient or that the filter drier is clogged.
A pollution of the filter drier, whose essential task is to clear the refrigerant from impurities and humidity, can
be detected by a temperature difference upstream and downstream the filter drier.
7.3 Refrigerant circuit
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