analog input AI
The outside temperature sensor is wired to universal input "x" (configured as analog input) of the "H/C changeover" function block in controller 1 (RMU7x0B).
The release relay in controller 1 acts on heating/refrigeration generation. The heating/cooling changeover signal acts on all controllers (here, controllers 1 and 2) in the same heating/refrigeration distribution zone.
If an analog signal is the source of the H/C changeover, two limit values must be selected for changeover. For further information see basic documentation, manual P3150.