Geothermal Free Cooling - Emerson Dixell iChill IC200D EVO Series Installing And Operating Instructions


machine in chiller and temperature/pressure inside the differential dF30: exchanger 1 and exchanger
2 ON

machine in heat pump and temperature/pressure inside the differential dF33: exchanger 2 ON

machine in heat pump and temperature/pressure inside the differential dF34: exchanger 1 and
exchanger 2 ON
In chiller when first compressor starts both exchangers are ON for dF36 time; after this time the regulation
follows diagrams above.
If dF36=0 the regulation follows diagrams above also at the start up.
In defrost this regulation is disabled.
In STD-BY or remote OFF the status of the exchangers is hybrid exchanger 1=ON, hybrid exchanger
2=OFF.
The set point is related to the status of the machine:

if the machine is producing cooled water and domestic hot water, reference set point is chiller set
point

if the machine is producing only domestic hot water, reference set point is heat pump set point

41. GEOTHERMAL FREE COOLING

Outputs managed:

relay for valve/pump management

0..10V analog output to control a modulating valve
In heating the relay is OFF and the analog output is 0V.
Free cooling operation mode:
 CF77=2: Free cooling is the only cooling source
 CF77=3: Free cooling and compressors work together to produce cooling. The compressors work
according their standard regulation.
Free cooling management:
2 probes are needed, selected from those configured in the instrument (1 Pb1, 2=Pb2, etc.); parameters to
select the probes are FS41 and FS42.
 if T1 temperature – T2 temperature  FS21, the Free cooling is enabled and the relay and analog
output are manages as figures below

if T1 temperature – T2 temperature < FS21 – FS22, the Free cooling is disabled
Analog output management:
1592015610 User manual IC200D EVO GB rel1.0 10.11.2015_rev10 IC200D 103/192