Evco c-pro nano CHIL Bedienungsanleitung PDF herunterladen (Seite 112)

C-PRO NANO CHIL AND C-PRO MICRO CHIL – APPLICATION MANUAL

Pag. 112

6.9 Circulating Pump Management

On AIR-TO-WATER or WATER-TO-WATER machines, the water-circulating pump is to be

controlled; in this case, at least one pump needs to be configured (PG09 > 0). The Pump operation

PP01 parameter defines how the pump is to operate:

- PP01 = 0 : Continuous operation

- PP01 = 1 : Operation at thermostat’s request

- PP01 = 2 : Cyclical operation

In continuous operation, pump control outputs must activate when the unit switches ON, and a

delay interval (parameter PP04) must elapse, before compressors are switched ON; vice versa, at

unit switch-OFF command, first any active compressors must switch OFF, and then a delay must

elapse (parameter PP05), before the pump can be switched OFF.

In operation at thermostat’s request, the pump is operated as a result of a request for heat or cold.

Upon such a request, first the pump output is activated and then – after delay PP04 – the

chilling/heating compressor is switched ON.

OFF

PP04

OFF

Thermostat

OFF

Cooling / Heating

PP05

Pump

In similar fashion, upon a thermostat’s switch-OFF request, the compressor switches OFF, whereas

the pump remains ON for the duration of PP05.

In cyclical operation, the pump is controlled by the definition of start-up/shutdown times: if during

the pump activation time the thermostat function triggers a chilling or heating request, the pump

remains activated for the whole duration of this request, plus any delay interval between compressor

shutdown and pump shutdown.

OFF

PP02 PP03

P P

PP02 PP03PP03PP03PP02 PP02

P P Pump

PP02 = Pump ON cycle time.

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Evco c-pro nano CHIL Bedienungsanleitung Seite 112