Step 1: Choosing the FCU Pipe Type

The RAC18-IP can be used in 4-pipe installations as well as in 2-pipe installations. In order for the controller to operate correctly in the application, it is necessary to know the fan coil pipe type and set the S3 DIP switch to the corresponding settings as described below.

4-Pipe Heating and Cooling

2-Pipe Only Heating or Only Cooling

For connection details go to steps 4, 5, and 6.