MAINTENANCE AND OPERATING MANUAL
Electronic controller
HAS T 070÷140
79
ENGLISH
EN
The data in this manual are not binding and they can be modified by the manufacturer without notice. Reproduction of this manual is strictly prohibited.
6.7.21 Free-cooling
The parameters for management of Free-Cooling can be defined in the menu.
The free-cooling unit is modular. One or more external free-cooling modules can be added in communication with the
machine.
The menu is accessible by means of the service level password and with Free-cooling enabled.
Free-cooling provides the facility to exploit ambient temperature, whenever possible, to cool the process water. By means of
a modulating three-way valve the water is transferred to a fan coil and cooled in a manner that is independent of or in
addition to normal operation of the unit.
The function is activated when the following condition is fulfilled for a programmable time period (minutes):
BAT < BFCIT
where:
• BAT is the temperature of the reference ambient probe
• BFCIT is the water temperature at the free-cooling coil inlet
• is the free-cooling activation differential
If the previous condition is false for a programmable time, free-cooling is deactivated.
Free-cooling can be activated only during operation of the unit in chiller mode.
The envisaged mode applicable on the machine is modular.
6.7.21.1Modular free-cooling
Modular free-cooling can be implemented with a system of free-cooling units, each of which composed of a valve and a
group of fans. The maximum number of modules that can be connected to the unit is 6.
CONFIGURATION
Proceed as follows to configure a modular free-cooling system.
1. Enable free-cooling in mask CU05 of the menu selecting the MODULAR option (changes can only be made
after accessing the reserved menu using either the service or manufacturer level password);
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