Manual code 75803707A.0708
Page 44 of 64
9 FREE COOLING AND TWIN SOURCES (pCO)
9.1 WATER FREE COOLING
The “Water Free Cooling” system installed on OCA…/FC - UCA…?/FC conditioners consists of an additional
cold water coil, integrated in the machine’s finned evaporator coil pack, and a 3-way moudulating valve controlled by the
microprocessor control.
As long as the external condition allow the water chiller to respond fully or partially to the request for cooling, the
microprocessor control excludes compressor intervention completely or limits it to the absolutely essential, thus making
for a considerable reduction in energy consumption. The compressors and the cold coil may therefore operate
simultaneously.
The Free Cooling system is configured by Tecnair LV during machine testing, on the request of the customer.
9.1.1 FREE COOLING CONTROL
The Free Cooling system is only enables when the following control logic conditions are met:
FCAMBFC
TT
≥
Where
FC
T
is the temperature of the water entering the conditioner,
AMB
T
is the ambient temperature and
FC
∆
is the activation delta value for Free Cooling operation(Default 4 °C).
The figure illustrates the system described above:
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