| 摘要 |
Auxiliary module (7) is attached securely to control unit (2) of a domestic heating system for support and electrical connection between unit (2) and module (7), the latter not needing its own power supply, but using that of unit (1). Auxiliary module (7) provides functionality additional to that of unit (2) alone, e.g. to receive transmitted radio signals which provide time information, weather conditions or weather predictions. |
