Technical data

Ichill 200CX EVO rev 1.1 14/11/2013
Pag. 86 of 151
• 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:
Digital output management:
Parameter Description min max udm
FS21
Temperature differential to enable the freecooling function
0 25.0
45
°C
°F
FS22
Temperature differential for the free cooling regulation
0.1
0
25.0
45
°C
°F
….
FS34 Free cooling water pump OFF time if chiller only Free cooling
0 250 min
FS35 Free cooling water pump ON time if chiller only Free cooling
0 250 sec