EVCO S.p.A.
c-pro 3 nano CHIL | Application manual ver. 1.0 | Code 144CP3NCHE104
page 63 of 90
If the antifreeze alarm should persist for the duration of the Period of pump operation with low-temperature PP10, the pump will switch
off until the next alarm reset.
If the anti-freeze is in OFF mode, only the heaters activate, while the alarm is not reported.
To enable the heaters as well as set the associated parameter (Pr01=1).
8.14 Single Evaporation
On the dual circuit machines you can choose to use just one circuit to manage evaporation. To enable this function you must set
PG12=1. Evaporation is performed by the anti-freeze and the resistors in Circuit # 1, using the values of the evaporation temperature
acquired by the respective transducers.
The resistors activated and the antifreeze alarm are also relative to Circuit # 1.
8.15 Free-cooling Management
To obtain a sensible energy savings in system management, the chiller has the option to use external air when it has favourable
thermal characteristics to exploit it’s energy content and obtain free cooling called “free-cooling”.
In the versions with free-cooling, a water coil is generally placed in front of the condensing coil (so that the air passes through this coil
first and then through the condensation one); when the external air temperature is lower than that of the water (and therefore it is
possible to cool the water “at the external air’s expense”) the water (or glycol mix) that enters the machine is deviated to the water coil
by way of a three-way valve or with a specific pump before going through the evaporator.
There is also the option to have a separate circuit for free-cooling with a designated fan (PG13=1,2), a condition which thus allows you
to optimally control condensation even with compressors on and simultaneously regulate the free-cooling fan.
8.15.1 Free-cooling Enablement
The free-cooling (FC) function for free cooling, if configured in parameter PS01, is enabled when the ∆Tfree-cooling (or the difference
between the input water temperature TInFC and the external temperature that hits the free-cooling exchanger Te) reaches the set
setpoint value (SetFC, parameter PS06). To avoid any oscillations in the state of free-cooling enablement, you can even set a
differential (DiffFC, parameter PS07).
The condition of the step must persist for at least a Minimum enablement period PS10 (default 30 seconds) before enabling/disabling
free-cooling.
In the event that the external probe is in error, free-cooling is disabled and the free-cooling command valve is disabled.
Even the condition of intervention of anti-freeze heaters (and therefore, the intervention of the relative alarm) will switch off the free-
cooling devices.
Other system safeties like: regulation probe broken, antifreeze control probe broken, evaporator flowmeter alarm, circulation pump
thermal switch, cause the unit to switch off and therefore the arrest of free-cooling control.
8.15.2 Free cooling Regulation
The enablement of the free-cooling lets you activate regulation proportional to the fan speed.
SetFC-DiffFCSetFC
1
TInFC – Te
0 = F.C. Off
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