Evco c-pro 3 micro CHIL Series - Page 77

EVCO S.p.A. c-pro 3 micro CHIL | Application manual ver. 1.0 | Codice 144CP3CHE104
page 77 of 120
8.19.3 Forced shutdown
This function enables the forced shutdown of all compressors, when CHW leaving temperature falls below the Summer forced-shutdown
set point (in the case of chiller operation), or exceeds the Winter forced-shutdown set point (in the case of heat-pump operation).
Compressors can only be restarted when the temperature crosses the set point once again.
• PC35 = Forced-shutdown enable
• PC36 = Summer forced-shutdown set point
• PC37 = Winter forced-shutdown set point.
8.19.4 High-pressure reduction at high temperatures (chiller)
This control makes it possible for the refrigerating circuit to operate even at high outside air temperatures. The change of the high-
pressure alarm is reduced by reduction of the circuit’s active power.
• PC45 =Pressure reduction enable at high temperatures
• PC46 = Pressure reduction set point at high temperatures
• PC47 = Pressure- reduction differential at high temperatures
• PC48 = High external air temperature threshold
• PC49 = Min. time for maintaining pressure reduction.
According to the number of configured compressors, the power-limiting percentage is calculated on the basis of this parameter:
• PC31 = Power limiting for summer operation
In order to enable this control, the outdoor air temperature sensor must be enabled.
This control can only be enabled in summer operating mode (chiller).
Ext.
air T
Pressure
Thresh.
Set
Set-Diff
HPHT
PC49