EVCO EPU2LXP1CH Installer manual - Manual (Page 69)

EVCO S.p.A. c-pro 3 micro CHIL | Application manual ver. 1.0 | Codice 144CP3CHE104
page 69 of 120
8.12.1 Defrosting cycle compensation
With the decreasing of the outdoor air temperature, the water vapor content in the air (which causes the formation of frost on the
evaporation battery, thus creating a need for defrosting) decreases, and it may therefore be advantageous to increase the defrosting-
activation delay in relation to the decrease in the outdoor air temperature, to improve the overall efficiency of the system. If enabled by
parameter Pd20, this function is activated at an Outdoor air temperature set point for defrosting compensation start Pd21, below which
set point compensation starts, with the increment of the defrosting activation delay, up to a maximum value (Maximum defrosting
delay Pd23) on reaching the Outdoor air temperature set point for defrosting compensation stop Pd22.
In order to enable this function, the outdoor air temperature sensor must be enabled.
8.13 Anti-freeze 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.
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).
8.14 Single evaporation
On twin-circuit machines, it is possible to choose to use only one circuit to manage evaporation. In order to enable this function, it is
necessary to set PG12=1. Evaporation is performed by anti-frost and resistors in Circuit # 1, using the highest of the evaporating
temperature values acquired from the respective transducers.
The activated resistors and anti-frost alarm are always that related to Circuit # 1.
Pd23
Activation delay
Ext. T
Pd22 Pd21
Pd03