The primary side control is carried out via the IBC controller, which is located in a separate SGK IBC. The SGK IBC including the controller, communication module and associated electrical diagram is created by the IBC. The wiring of the primary side field devices (combination valve, sensor, heat meter), as well as the interface wiring between the primary and secondary controllers, must be carried out by the customer and at their expense. The secondary side control is the customer's responsibility and must be accommodated in a separate SGK. The corresponding IBC controller <-> customer controller interfaces must be provided according to the connection type.