D-EIMAC00608-16_01EN - 10/27
Figure 5 - Operating limits with Option 187
Note.
The above graphic represents a guideline about the operating limits of the range. Please refer to Chiller Selection Software
(CSS) for real operating limits working conditions for each size.
4
FREECOOLING UNIT VERSION
Freecooling units have additional coils used to pre -cool the fluid coming from the building and increase the overall efficiency
by unloading the compressors until their completely stop if the environments conditions allow i t. The water flow can be
diverted to the additional coils in case the outside ambient temperature drops below the return water temperature by three
way valve (or two single way valves. It depends from chiller size).
Freecooling operation can be enable by QFC switch installed in the control section of the electrical panel . Once the
Freecooling function is enabled, the unit controller manages automatically the operation of the water valves. The system
controls, also, the operation of fans maximizing the freecooling effect.
THE WATER SYSTEM MUST BE FILLED WITH THE PROPER PERCENTAGE OF WATER
AND GLYCOL.
IT IS RESPOSABILITY OF END USER TO ENSURE TO APPROPRIATE AMOUNT OF
WATER/GLYCOL PERCENTAGE.
DAMAGE OF FREECOOLING COILS CAUSED BY FREEZING IS NOT COVERED BY THE
WARRANTY.
Install field-provided flow switches with water pump interlock to sense the system water flow.
TO PREVENT DAMAGE TO THE FREECOOLING COILS AND EVAPORATOR TUBES,
INSTALL A STRAINER IN THE UNIT WATER INLET PIPING. STRAINER MUST HAVE
MAXIMUM 0,5 MM MESH
