| 摘要 |
An additive unit 14 for a central heating or hot water system is connected in line to conduits 17, 20 of the system. The additive unit comprises a chamber having an inlet 16 connected to the first conduit 17 and provided with at valve 18 and an outlet 19 connected to the second conduit 20 and provided with a valve 21. The chamber is provided with a drain tap 22 and an access port 24 with a closure cap 25. A bypass conduit 27 extends through the interior of chamber 15. The inlet valve 18 and the outlet valve 21 switch flow from a normal route through the chamber 15 to a bypass route through the conduit 27. Fluid isolated in chamber 15 can be removed via a drain tap 22 and an additive/top up fluid introduced via port 24. Normal flow can be restored by operating valves 18, 21. |
