Technical data

Ichill 200CX EVO rev 1.1 14/11/2013
Pag. 54 of 151
28.2 Modulating Evaporator Water Pump
To enable the modulating evaporator water pump is necessary to configure an analog output as “Modulated
evaporator water pump” (see analog and digital output configuration) .
The modulating evaporator water pump is enabled in cooling, heating and sanitary hot water production; if
the machine is in STD-BY or OFF the water pump is OFF.
The water pump works according the Dt between two probes, which can be choosen both in summer an
winter mode, among those configured in the instrument (Pb1, Pb2,…).
If the state of the water pump is tied to the state of the compressor, when last compressor is switched off the
water pump is forced to run at US60 speed for CO18 minutes, then it is switched off.
If the state of the water pump is not tied to the state of the compressor, when last compressor is switched off
the water pump is forced to run at US60 speed.
The regulation is done as showed below.
Chiller and chiller + sanitary hot water (machine with valves OUt1 and OUT2 in the gas circuit)
Parameter Description min max udm
US 47 Probe 1 selection for evaporator water pump modulation in chiller 0 10
US 48 Probe 2 selection for evaporator water pump modulation in chiller 0 10
US 49 Set point for maximum speed of modulationg evaporator water pump in chiller 30.0
-58
0.0
0
70.0
158
50.0
725
°C
°F
Bar
Psi
Dec
int
Dec
int
US 50 Proportional band for maximum speed of modulationg evaporator water pump
in chiller
0.0
0
0.0
0
25.0
45
14.0
203
°C
°F
Bar
Psi
Dec
int
Dec
int
US 51 Minimum speed of the evaporator water pump in chiller 0 100 %
US 52 Maximum speed of the evaporator water pump in chiller 0 100 %
Heat pump and domestic hot water