EVCO c-pro nano CHIL - Manual (Page 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.
ON
OFF
PP04
ON
OFF
ON
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.
ON
OFF
PP02 PP03
P P
PP02 PP03 PP03 PP03 PP02 PP02
P P Pump
PP02 = Pump ON cycle time.