EVCO EPU2LXP1CH Installer manual - Manual (Page 66)

EVCO S.p.A. c-pro 3 micro CHIL | Application manual ver. 1.0 | Codice 144CP3CHE104
page 66 of 120
8.10 Circulating Pump Management
On AIR-TO-WATER or WATER-TO-WATER machines, 1 or 2 water-circulating pumps can be controlled, which are defined by the
parameter PG09. The Pump operation PP01 parameter defines how the pump will operate:
PP01 = 0: Continuous operation
PP01 = 1: Operation at thermostat’s request
PP01 = 2: Cyclic operation
In continuous operation the circulating pump is activated when the unit is switched ON and, after expiration of a time delay interval
(parameter PP04), the compressors could be energizated. When the unit is switched OFF the pump will be disactivated after a time
delay interval (parameter PP05).
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.
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.
PP02 = Pump ON cycle time.
PP03 = Pump OFF cycle time.
Parameter PP07 defines the pump’s behavior during a defrosting cycle. After modification of PP01 and PP07, it is necessary to power
down the machine and then power it up again, to avoid the risk of malfunctions.
It two pumps have been configured (PG09 = 2), both their operating hours must be equalized. Therefore, every PP08 number of
operating hours, shutdown is ordered for the active pump and start-up of the other pump.
In case of thermal alarm on one of the pumps, the control must activate the second pump. On the other hand, if both pumps are faulty,
or if the only configured pump is faulty, the alarm stops the unit.
Cooling/Heating
Pump
Thermostat
ON
ON
ON
OFF
OFF
OFF
PP04 PP05
Cooling/Heating
Pump
PP02PP03
PP05 PP04
ON
OFF
ON
OFF