| 摘要 |
Each down-pipe (4,5) has an air collection chamber (7) near its upper end. This is ventilated directly into the return pipe (6). The chamber is limited by a connection pipe section (8). One end (9) of the section is connected to the heating tube coil (10), and the other end (11) is connected to the return pipe (6) via a ventilation channel (12). The channel is part of a T-shaped ventilation piece (13). The two aligned connection parts (14,15) of the T-shape are built into the return pipe. The vertical part (16) contains the connection pipe section. The channel also has a small bore, which passes through the wall into the connection pipe section.
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