Evco c-pro 3 micro CHIL Series - Page 78

EVCO S.p.A. c-pro 3 micro CHIL | Application manual ver. 1.0 | Codice 144CP3CHE104
page 78 of 120
8.19.5 Low-pressure partialization at low temperatures (heat pump)
This control makes it possible to partialize the refrigerating circuit power when outdoor air temperature and refrigerated water
temperature conditions lead to the triggering of minimum-pressure alarms. If less than 15 minutes have elapsed since the triggering of
a minimum-pressure alarm and pressure falls below a given threshold, circuit active-power partialization is forced, till the pressure
climbs back over the threshold by a certain differential.
• PC50 = Pressure partialization enable at low temperatures
• PC51 = Pressure partialization set point at low temperatures
• PC52 = Pressure partialization differential at low temperatures
• PC53 = Low external air temperature threshold
• PC54 = Refrigerated-water high-temperature threshold
• PC55 = Delay for partialization from low pressure alarm.
According to the number of configured compressors, the power-limiting percentage is calculated on the basis of this parameter:
• PC32 = Power limiting for winter operation
In order to enable this control, the outdoor air temperature sensor must be enabled.
This control can only be enabled in winter operating mode (heat pump).
Ext.
air T
Pressure
Thresh.
Set
Set+Diff
LPLT
Alarm
less than 15 minutes
Water T
Thresh.