34 Chapter 13 Change-over RCF manual
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).
All controllers in the RCF range have a change-over function, but the RCFM models offer
manual change-over. 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, AO1 alt. DO4 (TD- and D models). If the temperature rises above
28°C (FS), the change-over function is turned off and heating is controlled on the output.
On models with manual change-over, control modes are changed manually using the ”M”
button. Alternatively, a potential-free contact can be used. The input function can be set to
NO/NC. FS = NO. In this mode, when the contact is open, heating is controlled. A closed
contact will initiate control of cooling.
Change-over can also be controlled via a central command. See list of variables contained in
the last section of the manual.
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