EVCO c-pro nano CHIL - Manual (Page 120)

C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Pag. 120
When the inlet temperature reaches the FC set point and remains below for more than PS14
seconds, free-cooling is disabled; the step, illustrated in the diagram, of hysteresis PS15 (default =
0.5° C) reactivates free-cooling and the ramp (provided the ON status is maintained for longer than
PS14 seconds).
When free-cooling regulation is on the ramp (i.e. the inlet water temperature is below the set point
value FC+FC band), the request of compressor steps is inhibited; once the temperature reaches the
upper limit in the proportional band and remains in that status for at least PS14 seconds, compressor
step request is enabled by primary regulation.
According to the way in which parameters PG13 and PG11 have been configured, different
functional modes are available in free-cooling:
PG13=0: SINGLE AIR CIRCUIT
In case of single condensing (PG11=1), with free-cooling active, the condensing fan will be
controlled via the aforementioned regulation, in relation to inlet temperature. If, following a
load increase, one proceeds to shutting down the compressors, then fan control will be
passed over to condensation control, thus remaining for as long as there is at least one
compressor active within the circuit in question.
In this configuration, the fan in use is a single one and the one referred to Circuit # 1, i.e. the
one configured in parameter HF31. This fan will take care of condensing and free-cooling
(any free-cooling battery must be put in this position).
In the case of separate condensing (PG11=0), one circuit regulates condensation in the
normal way, while the other condensing fan is controlled by the aforementioned free-cooling
regulation.
In this configuration, the fan utilised exclusively for condensing is the fan in Circuit # 2 (i.e.
the one configured in parameter HF32). The fan in Circuit # 1 will take care of condensing
in the same circuit and free-cooling, if conditions for it exist (any free-cooling battery must
be put in this position).
Inlet water temperature
Fan speed
Outlet water temperature
F-C set point
NZ set point
LB set point
PS02
PS04
PS03
PS15