1592015820 User manual IC260_261L_D DUO FW1.9 rel. 1.0
Pag. 96 of 149
44. 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:
CF97=2
: Free cooling is the only cooling source
CF97=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:
Digital output management:
