Evco c-pro 3 nano CHIL - High Pressure Reduction at High Temperatures (Chiller); Low Pressure Parcelling at Low Temperatures (Heat Pump)

EVCO S.p.A. c-pro 3 nano CHIL | Application manual ver. 1.0 | Code 144CP3NCHE104
page 70 of 90
• PC35 = Enable forced switch-off
• PC36 = Summer forced switch-off set point
• PC37 = Winter forced switch-off set point.
8.19.4 High pressure reduction at high temperatures (chiller)
This control makes it possible for the coolant circuit to operate at high external temperatures as well. The change of high-pressure
alarm decreases with the decrease in the active power in the circuit.
• PC45 = Enable pressure reduction at high temperatures
• PC46 = Pressure reduction setpoint at high temperatures
• PC47 = Pressure reduction differential at high temperatures
• PC48 = High external temperature threshold
• PC49 = Min. period to maintain pressure reduction.
Depending on the number of compressors configured, the percentage of energy limitation is calculated based on this parameter:
• PC31 = Energy limitation for summer operation
To enable this control, the external air temperature probe must be enabled
This control can be enabled only in summer operating mode (chiller).
8.19.5 Low pressure parcelling at low temperatures (heat pump)
This control makes it possible to parcel the coolant circuit’s energy when the external temperature and coolant water temperature
conditions lead to activation of the minimum pressure alarms. If less than 15 minutes have gone by from the minimum pressure alarm,
and the pressure drops below a certain threshold, parcelling of the power active in the circuit is forced, up until when the pressure goes
back above the threshold by a certain differential.
• PC50 = Enable pressure parcelling at low temperatures
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aria
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Pressione
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Diff imp
HPHT
PC49