sauter NRT405F901 - Chapter 13 Change-Over

NRT405F901 manual Chapter 13 Change-over 27
Chapter 13 Change-over
Change-over is a function enabling installations using only 2-pipe systems to use the same
pipe for both heating and cooling depending on whether heating or cooling is required
during, for instance, the summer months (Cooling control) or winter months (Heating
control).
Input may consist of either an analogue PT1000 sensor, or of a closing contact connected to a
universal input (FS = no sensor connected).
The PT1000 sensor must be mounted so that it can measure the temperature on the supply
pipe to the coil. Should this fall below 16°C (FS), change-over is activated and cooling
controlled on the output DO4. If the temperature rises above 28°C (FS), the change-over
function is turned off and heating is controlled on the output.
Change-over can also be controlled via a central command. See list of variables contained in
Part IV.