System expansions – Connection of further components Standard installations are described in the installation instructions for the PP 45 or PPB 30 final installation kit. These must be read before you proceed with further connections.Further informationSafety instructions 230 V connectionExternal sensorsAdditional room air controls (parallel operation)PP 45 EO EnOcean extension modulePP 45 LT power unitModBus interface (building control system connection)Operation with an odd number of unitsRLS 45 K: Additional functions on 230 V input