Stulz CQO 1102 ASF, Оригинальное руководство пользователя

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Refrigerant charge - Tightness, Quantity and Purity
Tightnes of the refrigerant circuit
According to article 3 of the EC regulation No. 842 / 2006 the operator must check the refrigerant circuit of
the chiller every 6 months for leaks. In the chillers described here, no more than 218kg (2 x 109kg) refriger
-
ant R410A are used.
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:
• pump down the refrigerant of a refrigerant circuit resp. a closed off section in a suitable pressure vessel
(recycling bottle) down to a pressure of 0 bar
rel
.
• dispose of the refrigerant according to the national regulations.
• repair the leak.
• check the tightness of the refrigerant circuit resp. the closed off section with nitrogen.
• the circuit has to be run dry by several fillings and extractings with high-quality nitrogen.
• change the filter drier cartridge.
evacuate the refrigerant circuit resp. the closed off section by a vacuum pump.
• fill the refrigerant circuit with the refrigerant named on the type plate.
An overfilling of the circuit makes the condensation pressure rise and by that, the power consumption of the
compressor. In the extreme the HP-switch triggers.
After repairing a leak, check the refrigeration circuit on tightness within one month.
The following information must be recorded by the operator in writing:
• quantity and type of the used refrigerant
• refilled refrigerant quantity
• recycled refrigerant quantity
• companies or persons which have carried out maintenance
• dates and results of inspections
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.
• Compare the colour indicator in the centre of the sight glass with the outer ring scale.
7.3 Refrigerant circuit