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Translation from original instructions
7.4.1 Checks during operation for FC/NG units
These units are distinguished by their various operating modes for meeting system demand that can take place with ope-
ration of the compressors, with free cooling alone or with the combined action of both.
The only checks that need to be done regard the refrigerating part.
In addition to what is indicated in the checks described above, for FC/NG units, also check:
- without free cooling active, check that, beyond a reading error of a few tenths of a degree of the respective probes, the
water temperature read at the evaporator inlet is not higher than the value read at the return from the system;
- that an evaporator inlet water temperature higher than the return temperature from the system indicates seepage in the
3-way valve;
-
that the difference between the dry cooler inlet and outlet temperatures is about 10°C;
- if it is higher, check that all the fans involved are turning correctly and that there are no parts obstructing the coil.
