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USER MANUAL – Release 1.2 of 01/01/2010
Page 148 of 191
Version: 02/03/2010
54.3
FREE-COOLING WITH EXTERNAL VENTILATION LAYOUT
Relay output configured as external free-cooling goes into ON when:
•
the free-cooling ON/OFF relay output is ON
•
the free-cooling mixer valve analogue output is in regulation mode
54.4
WORKING
If the
icon is on, working in free-cooling mode is enabled:
Regarding temperature control (switch-on/off of power steps) the free cooling has no effect. The internal or
external free cooling coil, pre-treats the water before it enters the evaporator, independently from
temperature control.
If the temperature difference between the value detected by the system water inlet probe and that detected
by the external air probe is grater than or the same as the value set in the
“input/output free cooling
differential” (FC02)
parameter for the
“input/output free cooling delay time” (FC03)
the free cooling
ON/OFF relay outlet (piloting the relative ON/OFF 3-way valve) is activated and assumes the ON or OFF
status depending on the temperature detected by the temperature control probe as per diagram below:
