LCA
RG66000986 – Rev.00
17
OPERATING LIMITS
Operating limits of LCA chillers in relation to the outlet water temperature and outdoor air temperature:
Min.
Max.
Temperature of water leaving evaporator [°C]:
5 (30)
12 (45)
Outdoor air temperature [°C]:
-10
45
WATER FLOW TO EVAPORATOR
The nominal flow rate is based on a thermal differential of 5° C between inlet and outlet water, in
relation to the cooling capacity provided at the nominal water (12/7 °C) and air (35°C) temperatures.
The maximum allowed flow rate is associated with a thermal differential of 3 °C: higher flow rates,
though admissible, cause pointless, high drops in pressure.
The minimum allowed flow rate is associated with a thermal differential of 8 °C or a minimum pressure
drop of 10 kPa: lower flow rates cause a reduction in heat exchange coefficients and excessively low
evaporation temperatures, which may trigger the safety devices and cause the unit to stop.
CHILLED WATER TEMPERATURES
The minimum temperature of the water leaving the evaporator is 5 °C: lower temperatures are possible,
but for such applications the Manufacturer should be consulted at the time the order is placed.
The maximum temperature of the water entering the evaporator is 20 °C. To allow higher temperatures
specific equipment solutions must be adapted (split circuits, three-way valves, bypasses, storage
reservoirs): contact the Manufacturer.
OUTDOOR AIR TEMPERATURE
The units are designed and built to work with outdoor temperatures ranging from -10 (with condensation
control) to 45 °C. Contact the Manufacturer in the event of outdoor temperatures beyond this range.
On request, the units may be equipped with an electric heating element serving to heat the evaporator
in cases where the unit is exposed to rigid temperatures during wintertime periods of quiescence.
The heating element is activated whenever the temperature of the water leaving the evaporator falls
below the temperature set on the antifreeze heating element.
OPERATION WITH WATER AT LOW TEMPERATURES
The standard units are not designed to work with chilled water temperatures below 5 °C
at the evaporator outlet. In order to work below this limit, the unit requires specific
technical adjustments: in such cases contact the Manufacturer.