Our interactive flash graphics illustrate the answer to this question.
Please note that the flash browser plug-in is required to view these graphics. This module is integrated as standard in Microsoft Internet Explorer, Netscape Navigator and Opera. If you are not able to view an animation after activation of the graphics and after the download has been completed (up to 10 sec. depending on your internet connection), please click the flash symbol to download and install the free plug-in on your system.
The animations of the refrigerating circuit of a heat pump and of a reversible heat pump can also be downloaded to your PC as separate windows programme files from our download area.