EVCO S.p.A.
c-pro 3 nano CHIL | Application manual ver. 1.0 | Code 144CP3NCHE104
page 61 of 90
8.10.2 Flowmeter Management
The flowmeter is constantly monitored once the chiller has been started and the Flowmeter start-up delay PA01 has elapsed. If the
contact indicates a lack of flow, the flowmeter alarm goes off immediately. The compressors do not receive commands when there is a
flowmeter alarm.
During normal operation, the flowmeter is constantly monitored; if the contact reports lack of flow for a period exceeding the value of
the Flowmeter alarm bypass PA02 parameter, the associated alarm activates immediately and all the active compressors switch off.
If the alarm should persist for a time equal to the value of the Period of pump operation with low water level PP09 parameter, the pump
turns off, too, and the alarm becomes a manual reset The pump is therefore protected against operation without water. The pump
starts back up when the alarm is reset.
The flowmeter alarm is an alarm with manual reset, unless it exceeds a certain number of events in an hour (max. number of flow
alarms with automatic reset PA03), circumstance in which it becomes a manual reset.
8.11 Circulation Source Pump Management
On the WATER/WATER machines you can control one or two water circulation source pumps, which are set in parameter PG10. The
Pump operation PP21 parameter sets how the pump will work.
The controls for regulations, modes, flowmeter, and safeties of these devices are the same as those of the circulation pumps described
above.
8.12 Defrost Management
This procedure is activated only in winter operating mode (heat pump), and when at least one compressor is on. Defrost takes place by
acting on the coolant circuit inverter’s valve.
If for a time interval equal to the value of the Enable defrost delay Pd03 parameter, the evaporation pressure remains (even if not
constantly) below the Defrost start-up setpoint Pd01 threshold and at least one compressor is in function, the inverter’s valve is
reversed and the defrost cycle starts. During this stage, the compressors are forced to maximum power and the low pressure alarm is
bypassed.
Defrost stops for one of the following causes:
• when the pressure reaches the end of defrost setpoint Pd02;
• when the max. defrost duration Pd05 has elapsed;
• when the machine’s or the circuits’ alarms have activated;
• when the unit has been switched off.
At the end of the defrost cycle, the unit stays stopped for the entire duration of the Dripping period Pd06.
Unit
ON
OFF
Flow
ON
ON
Alarm
PA01 PA02 PA02
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