Galletti LCE 244 HQ Инструкция по эксплуатации онлайн [27/64] 463243

LCE

RG66004766_rev.05

The hydraulic circuit - Free-Cooling versions

In addition to what has be mentioned above, the Free-Cooling versions foresee a 3-way valve capable of

deviating the flow towards the Free-Cooling coils placed upstream the condensing coils, in the air flow

direction. Valve activation is controlled by the microprocessor (ADVANCED as per standard) assessing

the difference between the system return water (T1) set point T and the outside air (T2). [fig. 5]

The probe placed at the evaporator (T3) inlet then triggers the activation of the compressors, integrating

them if the Free-Cooling performance is not sufficient to cover the entire thermal requirements. T1 and T3

temperatures are always controlled by the microprocessor on board the unit to assess any faults to the

free-cooling 3-way valve: for instance, in free-cooling mode with a switch valve and T1 and T3 are the

same, it means that the valve is blocked. In the event of faults occurring in the free-cooling mode, it is

possible to decide whether to only generate an alarm or to force the unit to shut down.

The 3-way valve can also be placed manually in the event of faults occurring in the actuating booster: the

figure below illustrates the position of the 3-way valve…

…which, after switching off the unit, can be accessed manually by removing the rear panel as show in the

figure.

Return from

utilities

Free-cooling

coil/s

fig. 5

3-way valve - free-

cooling version