Immergas Hydro 3 Instructions And Warnings page 40

Fan coil wiring diagram.
Circulation for temperature detection.
When activated, it allows low-speed air to circulate at regular
intervals for more precise control of room temperature.
Temperature offset for valve closure.
Allows you to select at which temperature below/above the
set point to close the 2-way valve
Cold anti-fan function.
Prevents the unit from remaining on in heating mode when
the inlet water temperature is too cold
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