User manual

1592022700 User manual iCHILL 200CX Rel. 1.0 22/04/2009
Pg.60/114
36 GEOTHERMAL FUNCTION
The function manages an ON/OFF valve (relay) or modulated valve (signal 0..10V) to use, for example, a ground water as cooling
integration.
Configuration:
• the function has to be activated by parameter US21
• two probes have to be configured by parameters US25 and US26
• one relay has to be configured as “valve for geothermal function”
Regulation probes:
• if the geothermal function is configured with parameter US27=0 (analog input 1 – analog input 2), the regulation uses the
analog input 1
• if the geothermal function is configured with parameter US27=1 (analog input 2 – analog input 1), the regulation uses the
analog input 2
Function activation:
• if US27=0: (analog input 1 – analog input 2) > US22 for a minimum time US24
• if US27=1: (analog input 2 – analog input 1) > US22 for a minimum time US24
Function deactivation:
• if US27=0: (analog input 1 – analog input 2) < US22 –US23 for a minimum time US24
• if US27=1: (analog input 2 – analog input 1) < US22 –US23 for a minimum time US24
Relay: geothermal function configured on direct action
Relay: geothermal function configured on reverse action