Setting the parameters of the Dietrich amc 25 condensing gas furnace

The boiler does not let you set a separate “room temperature range” directly; with an outdoor sensor it regulates the supply water via the heating curve, while the actual room temperature is usually limited by radiator thermostatic valves or a room thermostat, and CIRCA/CIRCA1 is only the heating circuit that must match how the installation is wired [#18115940][#18102342] If you want a constant supply temperature instead of weather control, set AP002 (Manual heat demand) to 1 and then set the flow temperature with AP026; in that mode the zone setting is overridden by the manual demand setting [#19661652][#19071966][#19318801] CIRCA is the main circuit on the front board, CIRCA1 is on the SCB-10 board, and only the circuit actually connected by the installer should be active; if the boiler was not fully configured, a service check may be needed [#18115940] The “frost protection” temperature is the outside-temperature threshold at which the boiler switches into frost-protection mode, and users noted that lowering this threshold, even to around -15°C, prevents it from entering that mode too early [#19225225][#19319208] For supply-water temperature, 80–85°C is too high; about 75°C is already an upper limit, and for a typical winter 50–55°C or around 60–65°C is more realistic depending on the house and radiators [#18100234][#18102342]