EVCO c-pro nano CHIL - Manual (Page 118)

C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL
Pag. 118
6.12.3 Defrosting heating coil
On heat pumps which do not possess the necessary thermal inertia of the recirculation mass (e.g.
air-to-air units), defrosting causes a rapid fall in ambient temperature, and it is therefore advisable –
to ensure greater comfort – to provide for the control of a defrosting-support heating coil.
6.13 Anti-frost management / Chilling-support heating coils
On air-to-water or water-to-water machines, anti-frost control is active even when the machine is
switched OFF, whereas on air-to-air machines heating coils only intervene when the machine is
ON.
Two thresholds are provided for, with their related differential: one is used to activate the heating
coils and the other one to signal the alarm and stop compressors within the associated circuit.
If the anti-frost alarm should persist for the duration of the Pump operation time at low temperature
PP10, the pump will be switched OFF until the next alarm reset.
In the case of anti-frost, in OFF status, only the heating coils are activated, whereas the alarm is not
notified.
In order to enable the heating coils, in addition to setting the associated parameter (Pr01=1), it is
also necessary to set from the CoSt->HArd menu the positions (HA02, HA03) of the digital outputs
corresponding to the two heating coils in use.